Mode Of The Cpu - Effect On The Cp - Siemens SIMATIC NET CP 1542-5 Equipment Manual

Procedure
1. Connect the module to PROFIBUS via the RS485 interface.
For the terminal assignment of the interface, see section PROFIBUS interface terminal
assignment (Page 43).
2. Switch on the power supply of the S7 station.
3. Close the front covers of the modules.
During operation, keep the hinged front panel closed.
PROFIBUS connection
Only use 90° connectors for the PROFIBUS connection. With other connector types, you
cannot close the front cover of the device.
3.5

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:
– Configuration and diagnostics of the CP (relevant system connections for
– S7 routing function
– Time-of-day synchronization
SIMATIC CP 1542-5
Equipment Manual, 01/2023, C79000-G8976-C326-05
configuration, diagnostics, and PG channel routing are retained);
Installation, wiring, commissioning, operation, disassembly
3.5 Mode of the CPU - effect on the CP
27