What it means
A01256 is an alarm from the Control Unit (CU): an error occurred when the read-write data of the EEPROM in the Option Board was being read. This read error is the only condition the manual names. The alarm value that travels with the message is, in the manual's own words, Only for internal Siemens troubleshooting.
— so the message value itself does not point to anything you can decode on site.
Why it appears
- An error occurred when reading the read-write data of the EEPROM in the Option Board.
What to check
- Carry out a POWER ON: switch the drive off and then on again.
- If the alarm is output again after switching on, replace the Control Unit.
Reading the message value
- The alarm value belonging to this message is stored in r2124.
- The manual says to interpret r2124 as a decimal number.
- No decoding of the value is given: it is
Only for internal Siemens troubleshooting.
Parameters the manual names
- r2124 (alarm value) — holds the alarm value that this alarm outputs; read it as a decimal number. For A01256 the manual states the value serves only for internal Siemens troubleshooting.
Acknowledging and restarting
This alarm requires no acknowledgement. The remedy is a POWER ON (switch-off/switch-on); if the alarm is output again afterwards, replace the Control Unit.
The same on every family
Every manual that describes A01256 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G130, G150 | NONE | NONE | Hardware/software error (1) | None | SINAMICS G130, G150 List Manual · p. 1397 |
| S120, S150 | NONE | NONE | Hardware/software error (1) | None | SINAMICS S120, S150 List Manual · p. 2585 |
The drives this code lives on
A01256 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 A01256 mean?
It is a Control Unit alarm signalling an error when reading the read-write data of the EEPROM in the Option Board. The accompanying alarm value in r2124 is only for internal Siemens troubleshooting.
How do I clear alarm A01256?
Carry out a POWER ON — switch the drive off and on again. If the alarm is output again afterwards, the remedy is to replace the Control Unit.
Does A01256 have to be acknowledged?
No, this alarm requires no acknowledgement. It is dealt with by the POWER ON described in the remedy.
What is the alarm value of A01256?
The alarm value is stored in r2124 and is to be interpreted as a decimal number. The manual states it is only for internal Siemens troubleshooting, so no further decoding is given.
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