Product description
2-14 Application Module FM 458-1 DP - User Manual
A5E01078222-02 Edition 03.2009
Transition of the FM458-1 DP from RUN->STOP:
As soon as the FM458-1 DP has reached the STOP state, the outputs
of block BSEND (SFB12) are set as follows:
ERROR = 0 and STATUS = 7.
Behavior for POWER ON: (refer to STOP->RUN).
Using diagnostics data set 0, FM458-DP signals whether it is in the
STOP or in the RUN state. This data set can be evaluated by the user
program on the S7-CPU side. The user can read diagnostics data set
0 of the FM458-1 DP, e.g. with SFC59 (RD_REC) using data set
number 0. The structure of this diagnostics data set can be found
under the module diagnostics info in the help or in the documentation
"STEP 7 - System and Standard Functions for S7-300 and S7-400".
The net data area from the user program can always be written in the
S7-CPU. However, data is only processed if the FM458-1 DP is in
RUN.
In HW Config, it is possible to configure the FM458-1 DP so that it
generates diagnostic alarms. The reason for generating a diagnostic
alarm is an operating state change. The diagnostics alarm is
evaluated in the user program in OB82 (I/O_FLT).
When does the FM generate a diagnostics alarm:
Change from RUN->STOP
Change from STOP->RUN, if this transition was not initiated by the
S7-CPU (e.g. as a result of an operator action on the PG)
Withdraw/insert the MMC
It is possible to configure the FM458-1 DP in HW Config so that it may
generate process alarms. In this case, block PAS7 is used on the FM
to configure this function.
The FM458-1 DP only sends process alarms to the S7-CPU in the
RUN state.
Diagnostics data
set 0 and operating
states
The net data area
from the
perspective of the
operating states
Diagnostics alarm
Process alarms
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