Siemens SIMATIC S7-1500T System Manual

Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
394 System Manual, 01/2024, A5E41814787-AF
The display of the primary CPU indicates the copying progress.
Table 12- 9 Copying the work memory
Primary CPU
Backup CPU
The backup CPU is busy accepting the data before it can also process the user program.
⑤ Making up backup CPU lag
In phase ⑤, the backup CPU catches up with the primary CPU.
The backup CPU sends a status message on its program progress to the primary CPU at each
cycle control point.

Siemens SIMATIC S7-1500T Specifications

General

Brand	Siemens
Model	SIMATIC S7-1500T
Category	Controller
Language	English