Pcs 7, Step 7: Editing And Downloading The User Program - Siemens SIMATIC S7-400H System Manual

14.3.7

PCS 7, Step 7: Editing and downloading the user program

Starting situation
The fault-tolerant system is operating with the new hardware configuration in redundant
mode.
The following program modifications are not possible in redundant state 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
CFC for S7, Continuous Function Chart
Procedure
1. Adapt the program to the new hardware configuration. You can add the following
2. Assign parameters for the added channel drivers and interconnect them with the newly
3. In SIMATIC Manager, select the charts folder and choose the "Options > Charts >
4. Compile only the modifications in the charts and load them into the PLC.
5. Configure the interconnections for the new CPs on both communication partners and
Result
The fault-tolerant system processes the entire system hardware with the new user program
in redundant mode.
S7-400H
System Manual, 09/2007, A5E00267695-03
CAUTION
components:
– CFC and SFC charts
– Blocks in existing charts
– Connections and parameter settings
assigned icons (see section PCS 7, Step 2: Offline modification of the hardware
configuration (Page 205)).
Generate Module Drivers" menu command.
NOTICE
Until an FC is called the first time, the value of its output is undefined. This must be
taken into account in the interconnection of the FC outputs.
download them to the PLC.
System modifications in operation
14.3 Adding components in PCS 7
manual.
209