Siemens SIMATIC S7-1500 System Manual page 320

Maintenance
13.1 Replacing components of the S7-1500R/H redundant system
Example: Paired
• In STEP 7 in the diagnostic status (Online & diagnostics) of the S7-1500R/H system:
Check the system state in the diagnostic status:
– Pairing: "Paired" is shown in the "Pairing state" field.
– No pairing: "No pairing" is displayed in the "Pairing status" field.
Figure 13-1 "Paired" diagnostics state
• In STEP 7 in the diagnostics buffer (Online & diagnostics): Check the entries on pairing.
320
Primary CPU Backup CPU
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD