Siemens SIMATIC S7-1500 System Manual page 62

Installation
4.7 Installing I/O modules
Installing I/O modules
Watch video sequence
manuals/getting-started_simatic-s7-1500/videos/EN/mount/start.html)
Proceed as follows to install an I/O module:
1. Insert a U connector into the back right on the I/O module.
Exception: the last I/O module in the assembly
2. Hook the I/O module on the mounting rail and slide the I/O module up to module on the
left.
3. Pivot the I/O module towards the back.
4. Tighten the screw for the I/O module (torque 1.5 Nm).
Figure 4-8
Uninstalling I/O modules
The I/O module is wired.
Proceed as follows to dismantle an I/O module:
1. Turn off all feed supply voltages.
2. Open the front cover.
3. For communications modules: Loosen and remove the connector from the module.
At I/O modules: Pull the front connector out of the I/O module using the unlocking strap.
Swivel the front connector downward and remove it from the groves.
4. Loosen the fixing screw of the I/O module.
5. Pivot the I/O module out of the mounting rail.
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Installing I/O module
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System Manual, 09/2016, A5E03461182-AD