Siemens SIMATIC S5 Manual page 287

Troubleshooting
O:
F 255. simultaneous signal change at the command inputs.
Only the highest priority command is transferred,
the others are lost.
Commands in decreasing priority:
F 255.1 :
F 255,2: user data block number not permitted.
F 255.3: the specified data block does not exist, is too short
or the parameter DWNR is greater than 236.
If DBNR = 164; DWNR is within the working area of FBI 64.
F 255.4: the specified interface does not exist.
5:
F 255. the specified parameter BA is not permitted or the
command is not allowed for the mode to be executad.
F 255.6: parameter assignment error SEND (FBI 20, FB160, FB244)
F 255. T: Parameter assignment error RECEIVE (FB121, FB181, FB245)\
O:
F 254. error message of the interface with operation
F 254.1 : module error caused by modes 1...17
F 254. z: not used
F 254.s: not used
F 254. d: not used
F 254. s: not used
F 254. 6: not used
F 254. T: not used
7 - 2 0
STOP --> STAR --> VORW --> RUCK --> UEBN
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
see page 22
pAFE of RECEIVE
see page 25
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Siemens AG C79000-B8576-C707 -Ol