Siemens SIMATIC ET 200SP HA System Manual page 59

Requirement
The installation of the Ex I/O is completed.
Note
Module in Zone 2
In general, it is not allowed to pull or plug modules in Zone 2.
Ensure that the power supply is switched off before starting work.
Mounting the server module
To mount the server module, proceed as follows:
Step
1
2
3
Modules for devices in a hazardous area
System Manual, 04/2021, A5E50165138-AA
Procedure
Hook the server module into the mounting rail to the
right of the last Ex BaseUnit.
Swivel the server module downwards until the fastening
elements click into place on the rail.
Slide the server module parallel to the left until it audibly
snaps into the previous, last Ex BaseUnit.
5.2 Mounting the Ex module group
Illustration
Installation
59