Siemens SIMATIC S7-1500 System Manual page 429

Commissioning
12.8 Identification and maintenance data
Reading I&M data over the user program
You have the following options for reading module I&M data in the user program:
• Using the RDREC instruction
The data record structure for centrally inserted modules and for distributed modules
accessible over PROFINET IO is described in the section Record structure for I&M data
(Page 429).
• Using the Get_IM_Data instruction
Note
Get_IM_Data: Loss of redundancy when reading out the I&M data from the
S7-1500 R/H CPU displays up to FW version V2.8
If you read out the I&M data from the displays of the CPUs, then the "Get_IM_Data"
instruction might, under certain circumstances, return different data to the two CPUs of
the S7-1500R/H redundant system. Further processing of this data in the user program
could possibly result in loss of redundancy.
Do not use the HW identifiers of the displays (65154, 65354) for the LADDR parameter of
the "Get_IM_Data" instruction.
Reference
The description of the instructions can be found in the STEP 7 online help.
Reading I&M data from displays
Proceed as follows to read the I&M data of a CPU:
1. Navigate to the "Overview/PLC" menu on the display of the CPU.
2. Select "Plant designation" or "Location identifier". Click "OK" to confirm.
Reading I&M data via STEP 7
Requirement: There must be an online connection to the CPU.
Proceed as follows to read the I&M data using STEP 7 from the primary and backup CPU:
1. Select the CPU in the project tree.
2. Go to "Online & diagnostics".
3. In the "Diagnostics" folder, select the "General" area.
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S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF