Siemens Simatic S7-1500R System Manual page 272

Procedure
To replace the coding element on the power connector of the system power supply and load
current supply, follow these steps:
1. Orient yourself using the labeling on the power cable connection.
Figure 11-3
2. Orient yourself using the red marking on the coding element.
3. The coding element has 3 red markings. Turn the coding element in such a way that one
of the 3 red markings corresponds to the voltage indicated on the connector.
4. Insert the coding element into the back side of the power cable connector, until you hear
it click into place. The figure below shows you how to insert a coding element into a
power cable connector for 24 V DC.
Figure 11-4
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
Labeling on the power connector
Inserting a coding element into a power connector
Maintenance
11.4 Firmware update
271