Step 7, Step 2: Offline Modification Of The Hardware Configuration; Step 7, Step 3: Expanding And Downloading Obs - Siemens SIMATIC S7-400H System Manual

14.5.2

STEP 7, step 2: Offline modification of the hardware configuration

Starting situation
The fault-tolerant system is operating in redundant mode. The modules added are not yet
addressed.
Procedure
1. Perform all the modifications to the hardware configuration relating to the added hardware
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. The PLC continues operation with the old
configuration in redundant mode.
Configuring connections
The interconnections with added CPs must be configured on both connection partners after
you complete the HW modification.
14.5.3

STEP 7, step 3: Expanding and downloading OBs

Starting situation
The fault-tolerant system is operating in redundant mode.
Procedure
1. Verify that the interrupt OBs 4x, 82, 83, 85, 86, OB 88 and 122 react to any interrupts of
2. Download the modified OBs and the corresponding program elements to the PLC.
Result
The fault-tolerant system is operating in redundant mode.
S7-400H
System Manual, 09/2007, A5E00267695-03
offline.
the new components as intended.
System modifications in operation
14.5 Adding components in STEP 7
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