Installation 
  3.5 Installing on the S7-1500 standard rail 
SCALANCE M874, M876 
Operating Instructions, 08/2018, C79000-G8976-C331-08 
39 
1.  Disconnect all connected cables. 
2.  Using a screwdriver, pull down the catch on the rear of the device. 
3.  Remove the device from the standard rail. 
 
Installing on the S7-1500 standard rail 
Requirement 
There is a SIM card for the device.  
1.  Insert the SIM card, see section "SIM card (Page 45)". 
2.  Place the first housing guide of the device on the top edge of the standard rail 
①. 
 
3.  Using a screwdriver, pull down the catch 
② on the rear of the device. 
4.  Swing the device down while pulling down the catch 
③. After it is released, the spring 
catch locks in place. 
5.  Connect the power supply, refer to the section "Power supply (Page 46)". 
6.  Fit the connectors for the digital input and digital output, refer to the section "Digital 
input/output (Page 49)".