Mode Of The Cpu - Effect On The Cp - Siemens PROFIBUS CP 1542-5 Manual

Connecting up / commissioning

5.4 Mode of the CPU - effect on the CP

5.4 Mode of the CPU - effect on the CP
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 CP behaves as described below.
Changing the CPU from STOP to RUN:
The CP 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 CP (system connections for configuration,
– S7 routing function
– Time-of-day synchronization
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diagnostics, and PG channel routing are retained);
Manual, 11/2014, C79000-G8976-C326-03
CP 1542-5