Siemens SIMATIC FM 456-2 Installation, Hardware, And Startup page 34

Installation and Startup
Screwing the Modules On
Figure 2-11 shows how to screw the modules on.
Tightening torque
0.8 to 1.1 Nm
Figure 2-11 Screwing the Modules On
2-16
FM 456-2 Application Function Module Installation, Hardware, and Startup
C79000-G7076-C458-01