Advantages:
•
During downloading, the primary CPU maintains control of the process. The plant remains
in operation.
•
Restore the previous user program:
After loading in the RUN-Solo operating mode, the backup CPU is in the STOP mode The
previous user program is still on the backup CPU.
If you want to restore the previous user program, then switch the primary CPU to the STOP
operating mode and then the backup CPU to the RUN operating state. Result: The backup
CPU with the previous user program starts as primary CPU.
Then switch the backup CPU to the RUN operating state. Result: The redundant system
with the previous user program is in the system state Run-Redundant.
NOTE
If you restore the previous user program, the procedure describes leads to the STOP
system of the redundant system.
Procedure
Proceed as follows to download the user program in RUN:
1.
Switch the backup CPU to the STOP operating state. The S7-1500R/H system switches to
RUN-Solo system state.
2.
Download the modified user program to the primary CPU with "Download to device" >
"Software (changes only)". The primary CPU continues to control the process.
3.
Switch the backup CPU to the RUN operating state.
The primary CPU remains in the RUN operating state and synchronizes the modified user
program with the backup CPU in SYNCUP.
Result: The S7-1500R/H system switches back to redundant mode with the modified user
program.
Downloading a modified user program in RUN-Redundant system state
From firmware version V2.8 of the R/H CPUs, you can download a modified user program in
RUN-Redundant system state. If no error messages are issued during the download process,
the modified user program is then downloaded into the redundant system.
Advantage: The redundant system remains in the RUN-Redundant system state during the
download.
Changes in the user program
The redundant system remains in the RUN-Redundant system state during the download
process when the following changes are made to the user program:
Table 11-2Loading changes in the RUN-Redundant system state
User program Action Feature to note
Text lists (alarms) New, Change -
Comments New, Change, Delete Exception: Comments in the hardware config
uration
Blocks Consistent loading of multiple changes -
OB New, Change, Delete, Change properties -
261
Commissioning
11.3 Commissioning procedure
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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