| Вид документа | Технічний бюлетень |
|---|---|
| Виробник | JCI |
| Код документа | digital-control-module-140-technical-bulletin |
| Група обладнання | Digital Control Module |
| Сторінок | 23 |
| Мова документа | англійська |
| Розмір файлу | 0.3 МБ |
Текст документа
Metasys Network Technical Manual 636
Control Modules Section
Technical Bulletin
Issue Date July 28, 2003
Digital Control Module 140
Introduction Page 2
Description 2
Theory of Operation 2
Engineering 6
Design Considerations 6
Inputs 6
Outputs 8
Installation Procedures 10
Mounting 10
Software Setup 10
Commissioning Procedures 14
Overview 14
Switch Settings 14
Power Up 15
Fast Trend Operations 17
Troubleshooting Procedures 18
Module 18
Inputs 19
Outputs 20
LED Errors 21
Ordering Information 22
Ordering Information 22
Specifications 22
© 2003 Johnson Controls, Inc. 1
Code No. LIT- 636021 www.johnsoncontrols.com
Introduction
Description The Digital Control Module 140 (DCM140) is a point interface and
control module residing in the Network Control Unit (NCU) or Network
Expansion Unit (NEU). It functions as a co-processor for the NCM,
providing Proportional-Integral-Derivative (PID) algorithms to regulate
modulating devices. By use of dual-input and dual-output function
modules, the DCM140 may be equipped with up to 20 universal
(analog/binary) inputs and a range of 10-20 analog/binary outputs,
depending on the function module mix. Light Emitting Diodes (LEDs) on
the module face indicate the operational status for the input and output
channels.
The DCM140 serves as a plug-in replacement for the DCM101.
Theory of The Digital Control Module’s inputs, outputs, and firmware enable it to
Operation perform closed-loop control over the devices wired to it. Yet, it receives
all its system configuration data (e.g., analog input sensor type, universal
output FM type) from the NCM (Item 1 of Figure 1) via the N2 Bus (2).
Before operation, the N2 Bus End-of-Line switch (3) and the DCM140
address switches (4) must be set to establish the hardware location on the
system.
1 EOL 3 Address 4
NCM
LEDs 8
N2 Bus
DCM Microprocessor
2
7
DCM
A/D Converter 6
Universal Universal
Output Output
Input FM HOA 10 Output FM
5 9
DCM140_
Figure 1: Block Diagram of DCM140 Operation
2 Control Modules—Digital Control Module 140
Input Function Modules (5) condition field signals from up to 20 separate
devices, and relay them to the DCM140 in one of the following modes
(options are selected by FM jumpers and software):
Table 1: Voltage and Current Modes
Mode Description
Voltage 0 to 10 Volts
(Note: Valid readings begin at 3 mV. See Devices That Report Zero
Volts, under Engineering, for information on how to read zero as a valid
condition.)
Current 0 to 20 mA power sourcing and sensing are performed over the same
two wires. Sensing of remotely sourced current is optional.
A software option also allows a user to span from 4 to 20 mA.
1000 ohm RTD Implements a 4-wire or 2-wire approach accepting 1000 ohm.
Resistance Temperature Device (RTD) signals. (This mode also
senses a single dry contact state.)
100 ohm RTD Implements a 4-wire approach accepting 100 ohm RTD signals.
For the voltage and current modes, the input has 12 bit resolution. The
DCM140 compensates for circuit drift as a result of ambient temperature
changes. Individual RTD input resolutions are detailed under
Specifications.
The data is then processed through an Analog/Digital converter (6).
The DCM140’s microprocessor (7) performs independently of the NCM,
executing control algorithms to determine commands for those devices
under its control.
Twenty closed-loop outputs are available in software, any of which can be
used in a master/submaster control loop.
The command issued to an output function module is based either on the
DCM140’s internal control action, or by order of the NCM. Parameters to
determine the sensitivity and speed of the adjustments are user set. Below
are some of the capabilities provided by the DCM140’s microprocessor:
Proportional- The proportional algorithm controls a device based on the present
Integral- performance. It calculates the difference between the set point and
Derivative (PID) feedback and adjusts the actuating device to close the gap. Both direct and
Algorithms reverse action commands may be carried out.
The integral portion of the algorithm controls the device based on past
performance. The difference between the set point and feedback is
integrated (accumulated) over time, and if the proportional algorithm is
insufficient to reach the setpoint in a timely manner, the integral algorithm
contributes to the response.
Control Modules—Digital Control Module 140 3
Future performance is adjusted using the derivative part of the algorithm.
The feedback’s current rate of change (the derivative) predicts the future
value of the feedback. As the controller sees the feedback changing faster,
the derivative term provides a braking function to avoid overshooting the
setpoint.
PID Diagnostics sample PID inputs and outputs to display a 60-count
circular buffer for up to 4 of the 30 PID attributes.
Point Status This feature notifies an operator of Changes-of-State (COS), and provides
Change Reports automatic responses. The DCM140 latches and holds any valid data
changed from a point; further data changes are ignored until the first-
detected change has been reported to, and acknowledged from, the NCM.
Debounce Filter To reduce reports from noisy contacts, the debounce filter ignores
transient or intermittent changes by requiring consecutive identical inputs
before determining a change in state.
Self-Tuning Self-tuning is a software program that automatically and continually
modifies (fine tunes) PID loop parameters to maintain a correct feedback
value. Besides simplifying control loop startups, self-tuning adjusts
control strategy due to mechanical aging of devices, or shifting variables,
such as varying temperatures. Two user-set parameters define acceptable
error and govern the authority of self-tuning (ranging from disabled to
fully enabled).
Bumpless When software control transfers from manual to automatic mode,
Transfer bumpless transfer activates as a means to prevent mechanical system upset
or potential damage. This routine tracks the commands sent prior to
transfer in relation to the difference between the setpoint and feedback of
the device. It then resolves the differences to reach setpoint. Softstart, a
related algorithm, brings chillers and fan systems under normal control
from startup, without setpoint hunting.
4 Control Modules—Digital Control Module 140
The LED board on the front of the module (8) indicates the status of the
following:
Table 2: LED Board
LED Description
Power Lit when all supply voltages are at their specified operating levels.
Error Lit during any sanity reset of the microprocessor.
Note: Indicates a reset only. Continuous resets indicate an error.
Refer to the Troubleshooting Procedures section for more information on
LED errors.
N2 Transmit Flickers when the DCM140 transmits on the N2 Bus.
N2 Receive Flickers when the DCM140 detects any receive data on the N2 Bus.
Inputs Status of inputs (Binary = user-defined; Analog = signal is within defined
warnings/limits).
Outputs Status of outputs (Binary = user-defined: Analog = the LED is always Off).
The ten universal outputs (9) transmit both binary and analog commands
to their respective function modules. Each of the outputs can be equipped
with dual-output analog function modules to control twenty separate
devices.
Additionally, the universal outputs interrogate their function modules’
Hand/Off/Auto (HOA) switch (10).
Control Modules—Digital Control Module 140 5
Engineering
Design When configured for use with either the Input Analog (IAN) or
Considerations Output Analog (OAN) function modules, the DCM140 requires
Metasys Release 5.02 or above.
The general DCM140 engineering steps are to:
1. Define the DCM140 hardware to the system software. (For
information about defining inputs and outputs, refer to the Operator
Workstation User’s Manual FAN-634).
2. Define the PID loops to the system software (refer to the PID Loop
(PIDL) Technical Bulletin).
3. Select and install the appropriate function modules, then wire the field
devices to the terminal blocks. Refer to the individual function
module documents for information and requirements specific to that
FM.
LEDs Input LEDs
Binary: LEDs indicate the “present state” as defined by the user
(either contact open or contact closed).
Analog: Input LEDs light when the operational status is normal
(reliable). For the dual-input IAN function module, both
channels must be reliable for the LED to light.
Output LEDs
Binary: LEDs indicate the “present state” as defined by the user (either
contact open or contact closed).
Analog: LEDs remain Off.
Replacing the The repair NU-DCM140-700 can serve as a plug-in replacement for the
DCM101 DCM101-0. No definition changes are needed.
When supervised by an NCM101, the DCM140 must be configured as a
DCM101, and it cannot support either the IAN or OAN.
Inputs Function modules interface inputs from devices that transmit voltage and
current, or sense RTD (1000 ohm, 100 ohm), frequency, and pressure
signals. The DCM140 has the capacity for ten input function modules.
Most FMs support a single input device. The Input Analog (IAN) and
Input Binary (IBN) function modules support two independent inputs.
6 Control Modules—Digital Control Module 140
Depending on the mix of input FMs, the DCM140 supports up to
twenty inputs. Below is a table of the input function modules, along with
the kind of signals they connect to the DCM140.
Table 3: Input Function Modules
Module Description
FM-IUN102-0 Input Universal: Directly transmits voltage, current, and RTD
signals into the DCM140 after conveying the signals through
sense circuitry, contact debounce circuitry, and protective
circuitry.
FM-IAN101-0* Input Analog: Simultaneously interfaces two independent inputs
of the same type. Accepts 2-Wire 1000 ohm RTD or
0-10 VDC. (VDC signals must be externally sourced.)
FM-IBN101-0 Input Binary: Simultaneously interfaces two independent inputs.
Dry Contact or 120 VDC/VAC.
FM-IBF101-0 Input Binary Frequency: Senses data as either a rapidly cycling
contact closure (up to 32 kHz) or input voltage (0-30 VRMS).
FM-IAP101-0 Input Analog Pneumatic: A Pressure/Electric Transducer,
reading from
0 - 25 psi.
FM-IDPxxx-0 Input Differential Pressure: Interfaces fourteen ranges of
FM-IDPBxxx-0 differential pressure for use by the DCM140.
• To use an FM-IAN101-0, the DCM140 must communicate to an NCM200 (or later), which
contains Release 5.02 (or later) software.
The 1000 ohm RTD input configuration accepts these temperature
sensors:
● 1000 ohm platinum (DIN0.00385 Standard.):--Input temperature range
is -66.46 to 140.43°C (-87.62 to 284.77°F).
● Johnson Controls nickel:--Input temperature range is -34.4 to 110°C
(-30 to 230°F).
● Johnson Controls silicon (TE6100-961):--Input temperature range is
-19.71 to 79.63°C (3.47 to175.33°F).
When using a 1000 ohm RTD, a 2-wire connection is recommended for
cable runs up to 150 feet. The 2-wire connection can also be made for
longer runs, with wire length compensation added in software.
Alternatively, the 4-wire option (FM-IUN102 only) compensates for any
cable length.
The 100 ohm RTD input configuration accepts a 100 ohm Platinum
(DIN0.00385 Standard.) temperature sensor: Input temperature range is
-30 to 230°F. All 100 ohm applications require a 4-wire connection
(FM-IUN102 only).
Input wiring to the DCM140 does not require shielding in general. For
extremely long runs without conduit, or where high EMI/RFI conditions
are expected, shielding is a good precaution. If an existing installation has
shielded cable, be sure to install and terminate the shields as detailed in the
function module technical bulletins.
Control Modules—Digital Control Module 140 7
IAN Input Timing The Input Analog FM (IAN), enables you to connect two separate devices
Considerations of the same signal type (i.e., both voltage or both RTD) to the DCM140
via a single FM slot. When implementing this dual-input FM, the
DCM140’s scan rate of those inputs will change from its typical once per
second scan to once every six seconds. To ensure that all fast control loops
are properly handled, assign all high-priority inputs to single input FMs.
This change in scan rates is independent of the mix of FMs: the DCM140
reads an IAN input at once per six seconds (and all other input FMs at
once per second).
Devices That The DCM140 allows definition of a fourth type of analog input:
Report Zero Volts “Volt/Ampere Low-End Reliable.” At this software setting, zero volts is a
reliable value. The Low-End Reliable setting applies to all AI types on a
DCM140, whether via single- or dual-point FMs.
Outputs The DCM140 executes digital-to-analog (user-configurable) commands
through output function modules. It has a slot capacity for ten FMs.
Most output FMs occupy one slot, and output signals to a single device.
There are two exceptions:
• The Output Analog Pneumatic (OAP101/102) occupies two slots and
controls a single device. (You may wish to use the newer OAP121,
which occupies one slot and also controls a single device.)
• The Output Analog (OAN) occupies a single slot, but controls
two independent analog devices.
Depending on the FM mix, the DCM140 supports up to 20 output devices.
Below is a table of the output function modules, along with the kind of
signals they output.
8 Control Modules—Digital Control Module 140
Table 4: Output Function Modules
Module Output Signals
FM-OAE101-0 Output Analog Electrical: Provides selectable analog output or
modulated current (0-20 mA sourced, 0-10 VDC sourced,
0-20 mA external source controlled).
FM-OAN101-0* Output Analog: Provides two selectable analog outputs of
current source at 0 to 20 mA (or 4 to 20 mA).
FM-OAI101-0 Output Analog Isolated: Provides an isolated power and ground
(0-20 mA sourced, 0-10 VDC sourced, 0-20 mA external source
controlled).
FM-OAP101-0 / Output Analog Pneumatic: An Electric/Pressure Transducer
FM-OAP102-0 controlling pneumatic devices (0-20 psi). Requires two slots.
FM-OAP121-0 Output Analog Pneumatic: An Electric/Pressure Transducer
controlling pneumatic devices (0-20 psi).
FM-OBE101-0 Output Binary Electrical: Provides a polarized 12 volt signal for
incremental control of field devices.
FM-OTE101-0 Output Triac Electrical: Controls 3-wire increase/decrease
signals (24 VAC, external supply required).
FM-ORM101-0 Output Relay Momentary: Control via Start/Stop Relays
(Form A and Form C).
FM-ORE101-0 Output Relay Electrical maintained: Form C relay controls
2-wire circuit.
FM-ORL101-0 Output Relay Latched: Form C relay controls 2-wire, latched
circuit.
FM-OSV101-0 Output Solenoid Valve: Controls 3-way pressure switching
(0–20 psig).
* To use an FM-OAN101-0, the DCM140 must communicate to an NCM200 (or later), which
contains Release 5.02 (or later) software.
Control Modules—Digital Control Module 140 9
Installation Procedures
Mounting Install the DCM140 in Slots 1 and/or 5 of a 5-Slot NCU/NEU, or in Slot 1
of a 2-Slot NCU/NEU. These are the only slots that support function
modules, which are required to condition signals into, and out of,
DCM140s.
The repair NU-DCM140-700 can serve as a plug-in replacement for the
DCM101-0.
5-slot 2-slot
Slot 1 Slot 5 Slot 1
FMs FMs FMs
1 - 10
Input 1 - 10
FMs Input
FMs
1 - 10 1 - 10
Output Output
FMs FMs
DCM140_4
DCM
Figure 2: Valid DCM140 Slots with Function Module Locations
Software Setup Define the DCM140 hardware object by entering data into the attribute
fields on the Definition window. Figure 3 shows the Definition window as
seen on the Operator Workstation; following is a description of each
attribute’s characteristics. This information defines the DCM140 module
to the system. The Software Architecture Technical Bulletin,
(LIT-636010), provides an overall guide to objects and attributes. The
Operator Workstation User’s Manual (FAN 634) describes the procedural
tasks to view and modify objects.
If the definition menu is for a new selection, all the fields have been
initialized to a default state.
If the Definition Window is brought up from an existing DCM140 object,
then all of the fields are filled in with the data from that object.
10 Control Modules—Digital Control Module 140
Fields that allow the data to be modified have the field value boxed in.
When a field entry is modified, the new value is immediately verified
when the field is exited.
For information on how to define the DCM140 with Data Definition
Language (DDL), Graphical Programming Language (GPL), or
JC-BASIC, refer to those manuals.
DCM140 Definition
Item Edit View Action Go To Accessory Help
Tower_1
AIR_SYS Bookmark
System Name NCU_5HW Comm. Disabled N
Object Name DCM-1
Expanded ID
NC Name NC5
Hardware: N2 Flags
Graphic Symbol # 0 NC Trunk Number 1 Auto Dialout N
Operating Instr. # 0 Device Address 10
Poll Priority 1
DCM140_5
Figure 3: Digital Control Module Definition Window
DCM140 Object Name
Hardware
Identification
Enter any valid 1-8 character string. The object name must not already
exist under the given system.
Expanded ID (Optional)
Enter any valid 0-24 character string.
Comm. Disabled
This flag shows whether communication over the N2 Bus is currently
disabled for this device (Y or N). Disabling communication prevents
commands, statuses, or alarms from being transmitted to or from the
DCM140 over the network.
Control Modules—Digital Control Module 140 11
Hardware N2 NCM Trunk Number
(NCM101, 102, 401) This entry establishes the connection to the port on
the NCM that contains the N2 submodule (1-2). The two ports on the
NCM are where the user-selected submodules are installed: the upper port
is 1, the lower port is 2.
(NCM200) This entry establishes the connection to the port on the
NCM200 containing the built-in N2 interface. Select 1.
Device Address
Enter the N2 address (0-255) assigned to the DCM140. The address must
agree with that set on the address switches, and must not be assigned to
any other device on this N2 Bus.
Poll Priority
Enter the priority level (0-3, zero being the highest priority) at which this
device should be polled.
Code Association Graphic Symbol #
to Graphics and
Help Screens If a graphic symbol has been composed to associate with this object, enter
the number of the graphic symbol (0-32767). Zero means no graphic
symbol is associated with this object.
Operating # (Instructions Number)
When “Help” is selected for this object, a notepad appears containing
user-modifiable operator instructions. Enter the number (0-32676) to
reference the desired notepad. Zero means no operator instructions will be
associated with this object.
Flags Auto Dialout
In cases when a remote Operator Workstation is defined on a dial-up link,
this selection (Y) forces an auto dialout from the NCM when the DCM140
issues a Critical 4 report.
12 Control Modules—Digital Control Module 140
Control Modules—Digital Control Module 140 13
Commissioning Procedures
Overview Commissioning a DCM140 begins after the module and associated power
supply module have been installed into the NCU/NEU, the field wires
inspected, the function modules installed, and the objects defined in
software. Refer to this technical bulletin as well as the Network Control
Unit/Network Expansion Unit Technical Bulletin for information
regarding these steps.
The general commissioning tasks are to set the DCM140 switches to their
appropriate positions and confirm proper operation via the LED indicators
and equipment response. The proper switch settings can be found in the
job drawings prepared by the application engineer for the specific job.
No special tools are necessary to commission the DCM140.
Switch Settings Figure 4 illustrates the switch positions on the faceplate of the DCM140
module.
EOL Switch
Address Switches
DCM140_6
Figure 4: Switch Positions on DCM140 Module
N2 End-of-Line The N2 End-of-Line (EOL) switch is set to In (up) if the module is
Switch physically the last one on the N2 line (i.e., the N2 wires enter, but do not
leave again on their way to another device). Only two N2 switches are set
to the In position among all the devices connected to any individual N2
network. For more information, refer to the N2 Communications Bus
Technical Bulletin, in the Metasys Network Technical Manual.
14 Control Modules—Digital Control Module 140
N2 Address The address switch is used by the NCM for polling, and is set to the same
Switch number as was assigned to the module in software. The address is set
according to the numbering on the faceplate; the numbers are in binary
format and vertically arranged with the least significant digit on top.
For example, if the module address is 119 (decimal), the binary
representation is 01110111--switches 1, 2, 4, 16, 32, and 64 must all be set
to the On (to the right) position (1+2+4+16+32+64 = 119), as shown in
Figure 5.
OFF ON
1
2
4
8
16
32
64
128
DCM140_7
Figure 5: Example of Setting Address Switch
Power Up
LEDs The LED indicators (Figure 6) supply evidence of the module’s condition
and help determine if the module is functioning properly.
Control Modules—Digital Control Module 140 15
Figure 6: Identification of LED Indicators on DCM140
Self-Diagnostics Turn on the power supply module to initialize the DCM140.
1. After applying power, the LEDs randomly light for a few seconds,
responding to commanded positions. Then the DCM140
automatically resets itself.
2. An input LED lights for approximately ten seconds. This LED
indication corresponds to the current firmware revision (e.g., input
LED 1 for Revision 1). Internal diagnostics take place during the
10 second interval.
3. All the LEDs light for approximately one second, then light
sequentially from top to bottom. This operation is a “lamp test” for
the LEDs, and takes approximately ten seconds.
16 Control Modules—Digital Control Module 140
4. If a failure occurs in the firmware, an output LED lights to signal the
failure code. Output LED 1, 2, or 3 lights for an SRAM failure, 4 for
an N2 communication failure, and 5 for an EPROM failure. The
DCM140 automatically resets itself. Listed below are error conditions
that require replacing the DCM140:
a. If the DCM140 continuously resets itself, a severe hardware
failure has occurred. Replace the module.
b. If the Error LED stays lit, a microprocessor error has occurred.
Replace the module.
c. If the Power LED turns off (and the power supply module is
functioning properly), a power failure is occurring either in the
connections between the power supply module and DCM140, or
inside the DCM140. If possible, test the connections by installing
a known functioning DCM140 module into the slot.
● A functioning DCM140 that works in the slot verifies the
connections. Replace the faulty DCM140.
● If a functioning DCM140 fails in the slot, the problem may
reside in the power supply module or NCU/NEU base frame.
Refer to the Network Control Unit/Network Expansion Unit
Technical Bulletin in this manual.
Fast Trend The DCM140 may reset when you perform consecutive Start/Modify Fast
Operations Trend operations from the Operator Workstation (OWS). This causes the
DCM140 to exhaust its available RAM.
Perform a Stop Fast Trend operation following the initial start. You may
then perform a Modify Fast Trend operation with the desired parameters.
Do not perform consecutive Start/Modify Fast Trend operations without
executing a stop command between them.
Note: This problem occurs in Release 5.02 of Metasys software and is
fixed in Release 6.0.
Control Modules—Digital Control Module 140 17
Troubleshooting Procedures
Module Perform the following steps to field check the DCM140. The input field
checks must be performed while the N2 Bus is communicating (N2 Bus
communications are checked in Step 3, below).
1. Ensure that the Power LED lights and remains lit to indicate that the
supply voltage is good.
2. Verify that the Error LED never lights (with the exception at power
on). If this LED constantly flashes, or remains illuminated, or if all
the LEDs constantly flash, a severe hardware failure is indicated.
Replace the module.
3. Next, verify that the device is being polled. This is evident if the
XMIT (transmit) LED lights, which indicates that the DCM140 is
replying to a poll.
● If the RECV LED does not light, the DCM140 is not connected
to the N2 Bus. Refer to the N2 Communication Bus Technical
Bulletin in this manual.
● If the RECV LED does light without the XMIT LED ever
responding, perhaps no messages are being addressed to the
DCM140. Ensure that the system is configured to poll the
DCM140 by cross-checking the address in the Hardware
Definition window with the address physically set by the N2
address switches.
Note: Changing the N2 address requires cycling power to the
DCM140 in order to reset and correct the address in the
system software.
● If the RECV and XMIT LEDs respond irregularly, and the
Definition window lists the DCM140 as being Offline, the
polarity of the N2 wire connection may be reversed. Inspect the
N2 Communication Bus wiring to ensure that the same color of
wire enters and exits the screw terminal. For further information,
refer to the N2 Bus Technical Bulletin Lit-636018 in this manual.
18 Control Modules—Digital Control Module 140
Inputs Use the following procedure to configure the DCM140 inputs:
1. Ensure that the binary input LEDs on the DCM140 coincide with the
“present state” indication at the NCM. This requires a comparison of
the point’s status, as seen on the Object Focus window or Network
Terminal, with the actual condition of the LED.
Note: The LED on/off condition is user-defined in software, such that the
LED light On may indicate either that the input contact is open or
that the input contact is closed.
Analog input LEDs light as follows:
● If Alarm Limits are defined in software, the LED remains on for
as long as the signal stays within the assigned warning limits.
● If limits are not defined in software, the LED remains on for as
long as the signal is reliable (stays within hardware values).
● In the case of the IAN function module, which accepts two analog
inputs, both inputs must have a reliable signal for the LED to
remain on.
2. Force each input to change state, then check:
a. The “present state” condition on the Object Focus window or
Network Terminal, and
b. The LED light to verify that the change was reported
accordingly.
3. Follow these steps if input is evident from the LED lights, but in a
non-functional or irregular pattern, the installed function module may
be an incorrect type, or, if the function module is an IUN, the jumpers
may be incorrectly placed.
● Ensure from the engineering drawings that the installed function
module is the correct one.
● Refer to the Input Universal Technical Bulletin for proper switch
settings and inspect the jumper positions on any questionable
IUN function module.
Control Modules—Digital Control Module 140 19
Outputs Use the following procedure to configure the DCM140 outputs:
1. Binary Outputs:
Ensure that the binary output LEDs on the DCM140 coincide with the
present state indication at the NCM (the analog output LEDs stay off).
This requires a comparison of the point’s status, as seen on the Object
Focus window or Network Terminal, with the actual condition of the
LED.
Notes: The LED on/off condition is user-defined in software, such that the
LED light on may indicate either that the output contact is open or
that the output contact is closed.
Analog Outputs:
The LEDs remain off (unused) for analog outputs.
2. Force each output to change state by overriding the present state via
the Operator Workstation or Network Terminal, then check:
a. The present state condition on the Object Focus window or
Network Terminal (this step tests analog as well as binary
outputs), and
b. The LED light to verify that the change was reported accordingly
(this tests binary outputs).
Note: Step 2 requires that the point database has been downloaded to the
DCM140. If no download has ever been made, the LED lights will
not indicate the present state.
3. If a field device responds erratically, or not at all, to an otherwise
functioning DCM140, check:
● To ensure that the appropriate type of FM is in the FM slot for that
device.
● The point object is defined with the correct slot number in
software.
If the problem cannot be corrected by a switch adjustment, terminal
wiring adjustment, FM adjustment, or in software:
a. Replace the module on the Object Focus window or Network
Terminal, and
b. Check the LED light to verify that the change was reported
accordingly.
20 Control Modules—Digital Control Module 140
Note: A new feature has been added to the DCM140 product.
A bumpless restart is available on DCM140s running the latest
firmware release (B04). This new feature eliminates any bumps of
resetting the analog outputs to zero when a new database is
downloaded to the DCM. This can be an important feature for
some types of mechanical equipment, like chillers, that are not
designed to stop and restart quickly. See the DCM140 ‘Bumpless’
Control Following an NCU Download Application Note
(LIT-6360205) for more information.
LED Errors There are a number of conditions under which the error LED light would
light. The conditions can be grouped as normal (a restart of the DCM) or
abnormal (an error occurring in the circuitry).
Normal conditions are:
1. The DCM power is cycled.
2. The NCM has been downloaded.
Abnormal conditions are:
1. The microprocessor does not service the power on reset circuit. This
indicates a dead microprocessor.
2. Sanity errors can be caused by memory faults that result in bad data.
3. The Watch Dog Timer expires causing the LED to continuously light.
4. The chip, which lights the LED, may be the failure mode making the
LED light turn on. Replace the DCM.
In general, the error LED light should not be on. It will be on temporarily
for normal conditions when the above-noted situations occur. However, it
should turn off when the situations are finished.
The abnormal conditions will result in continuously cycling or steady ON
error LED situations. If either occurs, there is a fault within the DCM,
and it should be replaced.
Control Modules—Digital Control Module 140 21
Ordering Information
Ordering Table 5: Ordering information
Information Description Johnson Controls Code Number
Digital Control Module 140 NU-DCM140-0
Digital Control Module 140, Repair NU-DCM140-700
Module
Specifications
Table 6: DCM 140 Specifications
Product Digital Control Module 140 (NU-DCM140-0)
Microprocessor 80C188
Memory 48K x 8-Bit Static RAM
16K x 8-Bit E2PROM
128K x 8-Bit EPROM
Inputs 10 Function Module Slots, handling up to 20 inputs
Input Accuracies Voltage and Current: 12 bit resolution, (0.0244% at room temperature)
100 Ohm RTD (DIN platinum): Resolution = 0.07°F over full range
1000 Ohm RTD (JCI nickel): Resolution = 0.07°F over full range
1000 Ohm RTD (DIN platinum): Resolution = 0.10°F over full range
1000 Ohm RTD (JCI silicon): Resolution = 0.05°F over full range
Outputs 10 Function Module Slots, handling up to 20 outputs
Output Accuracy Resolution is 10 bits (0.0977% over the full range). Output accuracy is further affected by
the individual output function module.
Source Power Power is from the PWR in the NCU/NEU
Ambient Operating 0 to 50°C (32 to 122°F)
Conditions 10% to 90% RH
Ambient Storage -40 to 70°C (-40 to 158°F)
Conditions 5% to 95% RH
Dimensions 355 x 36 x 152 mm (14 x 1.5 x 6 in.)
(H x W x D)
Shipping Weight 1.18 kg (2.6 lb)
Agency FCC, Part 15, Subpart J, Class A
Compliance UL916
CSA C22.2 No 205
Agency Listings UL Listed and CSA Certified as part of the Metasys Network
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions
beyond these specifications, consult the local Johnson Controls office. Johnson Controls, Inc. shall not be liable for
damages resulting from misapplication or misuse of its products.
22 Control Modules—Digital Control Module 140
Notes
www.johnsoncontrols.com
Controls Group FAN 636
507 E. Michigan Street Metasys Network Technical Manual
P.O. Box 423 Release 9.01
Milwaukee, WI 53201 Printed in U.S.A.
Control Modules—Digital Control Module 140 23Позиції каталогу з цим документом
Документ виробника, опублікований як довідковий матеріал на обладнання, яке ми постачаємо. Правовласник може попросити прибрати його — приберемо.