Expanding The Load Memory Of The Cpus Of The Redundant System S7-1500R/H - Siemens S7-1500 Function Manual

4.5 Expanding the load memory of the CPUs of the redundant system
S7-1500R/H
Memory requirements
If the memory space on one of the two SIMATIC memory cards is not sufficient, you can
replace this card during operation of the redundant system S7-1500R/H.
Note
To avoid errors on the SIMATIC memory card due to insufficient memory, use memory cards
with enough memory space.
Expanding the load memory during operation
To expand the load memory of the CPUs of the redundant system S7-1500R/H during
operation, follow these steps:
Action
1. Switch the first CPU to STOP while in redundant operation.
2. Remove the existing SIMATIC memory card from the CPU that is in
STOP. Insert a larger SIMATIC memory card.
3. After the memory reset switch the CPU back to RUN.
4. Wait until the SYNCUP of the CPU is complete and then switch the
second CPU to STOP.
5. Remove the existing SIMATIC memory card from the CPU that is in
STOP. Insert a larger SIMATIC memory card.
6. After the memory reset, switch the CPU back to RUN.
7. Wait until the SyncUp of the CPU is complete.
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC

4.5 Expanding the load memory of the CPUs of the redundant system S7-1500R/H

SIMATIC memory card
System response
The system changes to system state RUN-
Solo.
The CPU performs a memory reset.
The CPU performs a SYNCUP.
The system changes to system state RUN-
Solo again.
The CPU performs a memory reset.
The CPU performs a SYNCUP.
The CPUs now have a larger load memory
and are in system state RUN-Redundant
again.
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