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1.5.6
Rack components
When using the CM type described here, the following limits apply:
• The number of CMs that can be operated in a rack depends on the CPU type being used.
By operating several CMs, you can increase the configuration limits listed in the section
Properties and functions (Page 11) for the station as the whole. The CPU does, however,
have set limits for the entire configuration.
Note the information in the documentation of the CPU, refer to the section
Documentation references (Page 65)
Note
Power supply via the CPU adequate or additional power supply modules required
You can operate a certain number of modules in the S7-1500 station without an
additional power supply. Make sure that you keep to the specified power feed to the
backplane bus for the particular CPU type. Depending on the configuration of the S7-1500
station you may need to provide additional power supply modules.
1.6
Requirements for use
1.6.1
Usable CPUs
The following CPUs can be used as local CPU of the communications module:
• Compatible CPUs
All CPUs that can be configured in STEP 7 as of firmware version V2.1 from the following
series:
– Standard CPUs (CPU 15xx)
– Compact CPUs (CPU 15xxC)
– Technology CPUs (CPU 15xxT / TF)
– Fail-safe CPUs (CPU 15xxF)
The following CPUs cannot be used:
• Non-compatible CPUs
– H-CPU (CPU 1517H / HF)
– R-CPUs (CPU 151xR)
SIMATIC CM 1542-1
Operating Instructions, 04/2023, C79000-G8976-C355-05
Properties and functions
1.6 Requirements for use
19
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