What it means
A01989 («PN: internal cyclic data transfer error») is raised when the cyclic actual values and/or setpoints were not transferred within the specified times. The G130/G150 and S120/S150 manuals describe this alarm with the same cause and the same remedy, so one description covers all of these converters. The alarm value the drive stores with it is, per the manual, Only for internal Siemens troubleshooting
.
Why it appears
- The cyclic actual values and/or setpoints missed the times specified for the cyclic transfer — the manuals give this single cause for all drive objects, without distinguishing between components.
What to check
- Read the alarm value in r2124, interpreting it hexadecimal; the manual assigns it to internal Siemens troubleshooting only, so it holds no further indication for on-site diagnosis.
- Correctly set T_io_input or T_io_output. This is the only remedy the manuals name, aimed at the specified times within which the cyclic data must be transferred.
Reading the message value
- The drive stores the alarm value in r2124; the manual says to interpret it hexadecimal.
- No bit or value breakdown is printed for this alarm — the value is
Only for internal Siemens troubleshooting
.
Parameters the manual names
- r2124 — alarm value of this alarm; read it hexadecimal if needed, but the manual reserves it for internal Siemens troubleshooting.
- T_io_input / T_io_output — the two settings named in the remedy; set the relevant one correctly so that the cyclic actual values and setpoints are transferred within the specified times.
Acknowledging and restarting
No special reset procedure is given: the alarm requires no acknowledgment and the drive takes no automatic action in response. The corrective action is the remedy itself — set T_io_input or T_io_output correctly.
The same on every family
Every manual that describes A01989 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS S120, S150 List Manual · p. 2724 |
| G130, G150 | NONE | NONE | Communication error to the higher-level control system (9) | None | SINAMICS G130, G150 List Manual · p. 1498 |
The drives this code lives on
A01989 is described for G130, G150, S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does SINAMICS alarm A01989 mean?
It is the alarm «PN: internal cyclic data transfer error»: the cyclic actual values and/or setpoints were not transferred within the specified times. The alarm value stored in r2124 serves only for internal Siemens troubleshooting.
How do I fix A01989?
The manuals give one remedy: correctly set T_io_input or T_io_output, the settings behind the times within which the cyclic transfer must complete. No further checks are described for this alarm.
Does A01989 have to be acknowledged?
No. The alarm requires no acknowledgment and triggers no automatic reaction; setting T_io_input or T_io_output correctly is the entire corrective action.
What is the alarm value of A01989 in r2124?
It is interpreted hexadecimal, but the manual states it is only for internal Siemens troubleshooting and prints no decoding for it.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the A01xxx group · SINAMICS manuals · Siemens manuals