System modifications during redundant operation
10.3 Adding components
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
163
Step 7: Modify and download the user program
Starting situation
The fault-tolerant system is operating with the new hardware configuration in redundant
system mode.
The following program modifications are not possible in redundant system mode and result
in the system mode Stop (both CPUs in STOP mode):
• Structural modifications to an FB interface or the FB instance data.
• Structural modifications to global DBs.
• Compression of the CFC user program.
Before the entire program is recompiled and reloaded due to such modifications the
parameter values must be read back into the CFC, otherwise the modifications to the block
parameters could be lost. You will find more detailed information on this topic in the
S7, Continuous Function Chart
manual.
1. Adapt the program to the new hardware configuration. You can add the following
components:
– CFCs and SFCs
– Blocks in existing charts
– Connections and parameter settings
2. Assign parameters for the added channel drivers and interconnect them with the newly
assigned icons (see section Step 2: Modify the hardware configuration offline
(Page 158)).
3. In SIMATIC Manager, select the charts folder and choose the "Options > Charts >
Generate Module Drivers" menu command.
4. Compile only the modifications in the charts and download them to the target system.
5. Configure the interconnections for the new CPs on both communication partners and
download them to the target system.
The fault-tolerant system processes the entire system hardware with the new user program
in redundant system mode.
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