Downloading Projects To The Cpus - Siemens SIMATIC S7-1500 System Manual

Commissioning
11.3 Commissioning procedure
Incompatible assignment of redundancy IDs
There is pairing between the two CPUs. You can find more information in the section CPU
pairing (Page 250).
In the following case, the redundant system automatically checks the compatibility of the
redundancy IDs:
• Both CPUs are in STOP operating state and they have the same redundancy ID.
If the same redundancy ID has been assigned to both CPUs, the ERROR LEDs on both CPUs
flash in red. Each CPU display indicates an assignment conflict (symbol
generate an entry in the diagnostics buffer. You can read the entry on the display, for
example.
To establish redundant mode, resolve the assignment conflict in one of the following ways:
• Assign a different redundancy ID to one CPU using the display.
• Switch the CPU that is to retain its assigned redundancy ID to the RUN operating state.
Behavior of the CPUs when redundancy IDs are changed
Please note that you can only change the redundancy ID of a CPU in STOP operating state.
After each successful change of a redundancy ID, the CPU in question automatically restarts.
11.3.5

Downloading projects to the CPUs

Introduction
You need to download the project data to the CPU. Download either offline using the
SIMATIC memory card or over an online connection from the PG/PC/HMI device to a CPU. The
complete project data (all configuration data and the complete user program) can only be
downloaded when a CPU is in STOP operating state.
NOTE
Simultaneous online access to both CPUs
Simultaneous online access to both CPUs from STEP 7 is not possible. You can access either
the primary CPU or the backup CPU.
256
). The CPUs
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD