Maintenance and servicing
9
9.1
Notes on maintenance
When a SIMATIC CN 4100 communication system is configured redundantly, its modules may be
replaced online.
Applications
• Replacing the module (Page 57)
9.2
Maintenance
9.2.1
Replacing the module
Requirement
• The rack is mounted.
• The protective grounding is mounted.
• Required tools:
– TX20 screwdriver for tightening the fixing screws
Procedure
1. Switch off the power supply of the communications module.
Switching off the CPU module (Page 53)
2. Loosen the fixing screws.
3. Remove the module to be replaced.
4. Install the new module.
Plugging in the module (Page 33)
5. For a CPU module:
– Commission the new CPU module.
Switching on the CPU module (Page 52)
For an communications module:
– Switch on the power supply of the communications module.
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA
57