Siemens SIMATIC S7-300 Manual page 287

11.2.3 Error messages in checkback signals
Overview
Operator/travel errors [BF/FS] and data errors/machine data errors/traversing
program errors [DF], are communicated to the user by way of checkback sig-
nals (FC 2 call). The error-specification is stored in the form of an error num-
ber (see error list in Table 11-6...11-8
(DS162 and DS163).
Read out DS 162
(on BF/FS) or
read out DS 163
(on DF)
Error acknowledgement
Set/clear control signal [BFQ/FSQ]
or
on message [DF]
Note
Invalid data are not accepted. The original data are retained.
FM 354 Servo Drive Positioning Module
Checkback signals [BF/FS] and [DF] (group error messages)
... in user program (if nec-
essary)
Message in the "trouble-
shooting" display of "Para-
meterize FM 354"
Menu: Test
write a new write job
in the corresponding data block
)
Error specification ...
... programming device/PC
in diagnostic buffer
Alarms
Troubleshooting
11-7