Siemens SIMATIC S7-1500 System Manual page 379

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