Siemens Simatic S7-1500 - Page 379

Commissioning
12.3 Commissioning procedure
S7-1500R/H redundant system
378 System Manual, 01/2024, A5E41814787-AF
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 12- 2 Loading 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 con-
figuration
Blocks
Consistent loading of multiple changes
-
OB
New, Change, Delete, Change properties
-
FB, FC, DB, user data type UDT
New, Change, Delete
-
FB, FC
Change code, Change interface
-
DB
Change properties (change "Optimized
block access" attribute)
-
New
Actual values in the new data blocks are set to
start values.
Change name/type of tags, add or delete
tags (memory reserve not enabled)
Actual values of tags in the structurally modi-
fied data blocks are set to start values.
Add new tags (memory reserve activated) Actual values of added tags within the
memory reserve are set to start values.
PLC tags
Add (timers, counters, bit memories)
-