Siemens SINUMERIK 840Di Diagnostic Manual page 817

11/2006
400251 NCK has not started up
Definitions: NCK has not contacted the PLC.
NCK has not ramped up.
Acknowledgement error during ramp-up: the time limit entered in OB1 / FB1 under parameter address
MCP1Cycl or MCP2Cycl has been exceeded.
Reaction: Alarm display.
Remedy: Enter the default values in FB1 correctly.
Carry out a general NCK reset and restart.
Increase the time values in FB1.
Program Internal
Continuation:
400252 Error in internal communication with NCK
Definitions: An error has occured during data transmission between the PLC and the NCK (FM-NC only).
Reaction: Alarm display.
Remedy: NCK restart
Program Internal
Continuation:
400253 PLC STOP because of SPL system error
Definitions: After the interruption of the communication between the NCK and the PLC with regard to the SPL data
cross-check, the PLC was switched to STOP with a delay of 5 s.
Reaction: Alarm display.
Remedy: Do no longer start SPL. Check the system components (PLC must be provided with the correct version
of FB15 and with DB18).
Program Switch control OFF - ON.
Continuation:
400255 Sign of life monitoring NCK2
Definitions: NCK2 has not contacted the PLC during cyclic operation. Timer of FB1 parameter NCCyclTimeout
was executed without retrigger. (FM-NC only).
Reaction: Alarm display.
Remedy: NCK restart
Program Internal
Continuation:
400256 NCK2 has not run up
Definitions: NCK2 has not run up. NCK has not contacted the PLC. Timer of FB1 parameter NCRunupTimeout
has expired. (FM-NC only).
Reaction: Alarm display.
Remedy: General NCK reset and restart.
Program Internal
Continuation:
400257 Error in internal communication with NCK2
Definitions: An error has occured during data transmission between the PLC and the NCK. (FM-NC only)
Reaction: Alarm display.
Remedy: NCK restart
Program Internal
Continuation:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
PLC alarms
2-817