Hardware Configuration - Siemens SIMATIC S7-1500 System Manual

Application planning

5.6 Hardware configuration

Diagnostics
System state, operating states and error displays after the failure of both PROFINET cables:
• Redundant system → RUN-Redundant system state
• Primary CPU/Backup CPU → RUN-Redundant operating state
– MAINT LED → yellow light: No backup AR.
– ERROR LED → flashes red: One or more IO devices have failed.
NOTE
To get detailed diagnostics information, evaluate the diagnostics buffer.
Solution
Replace the defective PROFINET cables. You can find additional information on the procedure
in the section Replacing defective PROFINET cables.
5.6 Hardware configuration
Modules suitable for R/H-CPUs
The integrated system power supply of the R/H-CPU supplies the required power for
operation. Optionally, you can also use a load current supply.
The table below shows which modules can be used in the various R/H-CPU slots:
Table 5-5 Maximum configuration
Module type
Load current supply (PM)
CPU
1) No connection to the backplane bus.
148
Maximum number of
modules, primary CPU
(mounting rail)
1)
Unlimited
1
Maximum number of mod­
ules, backup CPU (mounting
rail)
Unlimited
1
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD