Connecting up / commissioning
5.4 Mode of the CPU - effect on the CM
CM 1542-5
22
Manual, 11/2014, C79000-G8976-C290-02
5.4
Mode of the CPU - effect on the CM
You can change the mode of the CPU between RUN and STOP using the STEP 7
configuration software.
Depending on the operating status of the CPU, the CM behaves as described below.
Changing the CPU from STOP to RUN:
The CM loads configured and/or downloaded data into the work memory and then changes
to RUN mode.
Changing the CPU from RUN to STOP:
The reaction is as follows in STOP:
●
DP master mode: Change to the CLEAR mode.
●
DP slave mode: Input data is sent to the DP master with the value "0" and a DP
diagnostics alarm is sent.
●
The following functions remain enabled:
–
The configuration and diagnostics of the CM (system connections for configuration,
diagnostics, and PG channel routing are retained);
–
S7 routing function
–
Time-of-day synchronization
