2
0
1
8
-1
2
46
Installation
3.6.2
I/O Modules with Cable Tail
I/O modules with a cable tail must be connected to separately approved terminals that comply
with type of protection Ex-e. These terminals must be equipped with a cover with degree of
protection IP30. The cover ensures that no bare, conductive parts are exposed.
Figure 3.20
Field wiring of an I/O module with 2 cable tails
Installing field wiring for I/O modules with cable tail
The terminals for the field wiring must be equipped with a cover with degree of protection IP30.
1. Install the terminals on a separate DIN mounting rail. Arrange the terminals so that the length
of the cable tails is sufficient.
2. Refer to the color coding of the connections from the datasheets for the I/O modules used.
3. Make sure that the separation distances to intrinsically safe circuits are observed.
4. Make sure that the insulation on the conductors extends all the way to the terminal.
5. Follow the manufacturer's mounting instructions to install the terminals and the cover.
6. Unused cables and connection lines must be either connected to terminals, securely fixed
and isolated, or grounded.
7. Apply the warning marking
Warning - non-intrinsically safe circuits protected by
internal cover with degree of protection IP30!
to a visible location on the surrounding
enclosure.
8. Label the connection lines.
Danger!
Explosion hazard by removing the cover
If intrinsically safe and non-intrinsically safe circuits are present, covers with degree of
protection IP30 may be removed only when the non-intrinsically safe circuits are de-energized
and currentless. This can be achieved by disconnecting the I/O module and activating the field
circuits using a multifunction terminal (MFT-*).
n
Only remove the cover when not located in a potentially explosive atmosphere.
n
Only remove the cover if the non-intrinsically safe circuits are de-energized (no voltage or
current).
n
Remove the I/O module or switch off the circuit using the multifunction terminal.
