Communication blocks
Function Blocks - FM 458-1 DP 2-23
Edition 12.2004
2.3.5 S7STAT S7 CPU operating state
S7STAT
RUN BO
S7-CPU in RUN
STP BO
S7-CPU in STOP
HLD BO
S7-CPU in HOLD
ACT W
actual operating state
OLD W
previous operating state
The actual and previous S7-CPU operating states are displayed at the
outputs.
The actual and previous operating state of the S7-CPU is determined and
displayed at connectors ACT for the actual and OLD for the previous
operating state. Output RUN is set to TRUE if the S7-CPU is either in the
RUN or RUN-R state.
Output value
to ACT or OLD
Operating state RUN STP HLD
0x0010 Stop 0 1 0
0x0020 Cold start 0 0 0
0x0040 New start 0 0 0
0x0080 Re-start 0 0 0
0x0100 RUN 1 0 0
0x0200 RUN-R 1 0 0
0x0400 Hold 0 0 1
NOTE
All other values are used for extended diagnostics.
RUN S7-CPU in RUN (Default: 0)
STP S7-CPU in STOP (Default: 0)
HLD S7-CPU in HOLD (Default: 0)
ACT Actual operating state of the S7-CPU (Default: 0x8000)
OLD Previous operating state of the S7-CPU (Default: 0x8000)
Please refer to the help for STEP7 for a more detailed description of the
operating states.
Symbol
Brief description
Mode of operation
I/O
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