What it means
The basic positioner (EPOS) cannot be enabled because at least one of its enabling conditions is missing. The drive shows which condition through the alarm value in r2124: either the EPOS enable (binector input p2656) or the position actual value valid feedback signal (binector input p2658). The alarm triggers no automatic drive response and requires no acknowledgement; the basic positioner simply cannot be enabled until the missing condition is present again.
Why it appears
- At least one condition for enabling the basic positioner (EPOS) is missing.
- The EPOS enable is missing (binector input p2656, alarm value 1).
- The position actual value valid feedback signal is missing (binector input p2658, alarm value 2).
What to check
- Read the alarm value in r2124 and interpret it as a decimal number to identify the missing condition.
- Alarm value 1: check the binector input p2656 (EPOS enable) and its signal source.
- Alarm value 2: check the binector input p2658 (position actual value, valid feedback signal) and its signal source.
Reading the message value
- The drive writes the alarm value to r2124; interpret it as a decimal number.
- 1: EPOS enable missing (BI: p2656).
- 2: Position actual value, valid feedback signal missing (BI: p2658).
Parameters the manual names
- r2124 — alarm value; read it here as a decimal number to see which enabling condition of the basic positioner is missing.
- p2656 — binector input for the EPOS enable of the basic positioner; check its signal source when the alarm value is 1.
- p2658 — binector input for the position actual value valid feedback signal; check its signal source when the alarm value is 2.
Acknowledging and restarting
No acknowledgement is required and the drive performs no automatic response for this alarm. Restore the missing condition — the EPOS enable or the position actual value valid feedback signal — so that the basic positioner can be enabled again.
The same on every family
Every manual that describes A07496 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2831 |
| G130, G150 | NONE | NONE | Application/technological function faulted (17) | None | SINAMICS G130, G150 List Manual · p. 1568 |
The drives this code lives on
A07496 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 alarm A07496 (EPOS: Enable not possible) mean?
The basic positioner (EPOS) cannot be enabled because at least one enabling condition is missing. The alarm value in r2124 tells which one: 1 for a missing EPOS enable (p2656), 2 for a missing position actual value valid feedback signal (p2658).
How do I fix A07496 on a SINAMICS drive?
Check the condition named by the alarm value in r2124: for value 1 the signal at binector input p2656, for value 2 the signal at binector input p2658, in each case including the signal source.
Does A07496 have to be acknowledged?
No. The alarm triggers no automatic drive reaction and needs no acknowledgement; it only reports that the basic positioner cannot be enabled until the missing condition is present.
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 A07xxx group · SINAMICS manuals · Siemens manuals