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Application and functions
1.2 Further functions
• S7 communication
– PG communication for uploading / downloading of S7 configuration, diagnostics and
– Operator control and monitoring functions (HMI communication)
– Data exchange over S7 connections
• Data record routing / field device parameter assignment
You can use the CM as a router for data records intended for field devices (DP slaves). Data
records from devices that are not connected directly to PROFIBUS and therefore have no
direct access to the DP slaves are forwarded to the DP slaves by the CM.
The services of the CM 1542-5 listed above can be used independently at the same time.
Note
Requirement for FDL, data record routing, loading of configuration/diagnostics data
For the functions FDL, data record routing and loading configuration and diagnostics data the
CM must either be operated in the mode DP master mode or as a DP slave with the option
"Test, Commissioning and Routing" enabled.
1.2
Further functions
Enabling /disabling DP slave - in the standard system
DP slaves can be activated and deactivated by the user program using system function
D_ACT_DP.
Diagnostics requests
As a DP master (class 1), the CM 1542-5 supports diagnostics requests of a DP master (class
2).
Getting the bus topology in a DP master system
The CM 1542-5 operating as DP master supports the measurement of the PROFIBUS bus
topology in a DP master system using a diagnostics repeater (DP slave).
System function DP_TOPOL in the user program can instruct diagnostics repeaters to measure
the PROFIBUS BUS topology in a DP master system.
12
routing
Operating Instructions, 01/2023, C79000-G8976-C290-07
SIMATIC CM 1542-5
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