You can find information on the tightening torques in section "Tools and tightening torques
(Page 186)".
Step
1 Only SIMATIC CFU ... with aluminum housing:
If you are using the CFU in the housing, you must observe the following section: "Compact Field
Unit in the housing for use in a hazardous area (Page 129)".
Mount the housing.
2 Install the mounting rail (see the section "Installing the mounting rail (Page 48)") or the housing
depending on the installation type.
3 Latch the CFU onto the mounting rail from below.
Press the CFU upward until the supports latch into the mounting rail.
Tighten the fixing screws at both sides of the CFU (see "Front view of the CFU (Page 20)";
Position A).
Installing the cables
The basic procedure applies to all cables (power supply, FB<n> and DIQ<n>), bus cables for PROFI‐
NET IO and bus cables for PROFIBUS PA)
4 Only SIMATIC CFU ... with aluminum housing:
When you use the CFU in the housing, loosen the screw caps of the cable glands for the positions
at which cables are to be routed through the housing.
Check the seals for damage and correct seating. If necessary, replace the cable gland. It is
possible to install specially certified cable and conductor glands, reducing inserts as well as
blanking and sealing plugs.
Remove unused blanking plugs and reducing inserts from the cable glands. Route the cables
through the cable glands and then into the housing (thread side to the housing). Only perma‐
nently installed cables and lines may be inserted.
Note:
Ensure that the cables are correctly sealed (see section "Tools and tightening torques
(Page 186)")
5 Connect the cables to the connections of the CFU (FB<n> and DIQ<n>).
Observe the pin assignment on the plug connector:
● See section "Connecting a sensor / actuator to the CFU (Page 60)"
● See section "CFU PA: Connecting a PROFIBUS PA field device (Page 59)"
● See section "CFU PA: Terminal assignment (Page 183)"
● See section "CFU DIQ: Terminal assignment (Page 184)"
Installation
6.3 Installing the CFU
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD 51
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