Siemens SIMATIC S7-400H Manual page 228

Modifying the System During Operation
11.2.2 PCS 7, Step 2: Offline Modification of the Hardware
Configuration
Initial situation
The fault-tolerant system is working in redundant system mode.
Procedure
1. Perform all the modifications to the hardware configuration relating to the added
hardware offline. Assign appropriate icons to the new channels to be used.
2. Compile the new hardware configuration, but do not load it into the PLC just
yet.
Result
The modified hardware configuration is in the PG/ES. The PLC continues to work
with the old configuration in redundant system mode.
Configuring connections
Connections from or to newly added CPs must be configured on both connection
partners after modification of the hardware configuration is completed.
11-8
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07