Installation
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3.6.1
I/O Modules with Front Socket
Field connections can be made to the I/O modules using screw terminals, front screw
terminals, or spring terminals. Use the terminal blocks and protective covers from the range of
accessories. See chapter 2.7.1
Front screw terminals or spring terminals are ideal for performing extensions at a later point or
for changing individual field connections, as the plug can remain in the front socket of the I/O
modules during wiring. These terminals also offer a test plug socket for measuring individual
circuits.
Installing field wiring for intrinsically safe circuits
1. The I/O modules are wired differently depending on the type. Wire the terminal blocks to the
field devices in accordance with the information in the datasheets for the I/O modules used.
2. Note the permissible core cross section of the conductor. We recommend that you do not
exceed a conductor cross section of 0.75 mm
2
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3. If you are using stranded conductors, crimp the stranded conductors with wire end ferrules.
4. Make sure that the insulation on the conductors extends all the way to the terminal.
5. Only use blue terminal blocks/protective covers for intrinsically safe circuits.
6. Make sure that the separation distances to non-intrinsically safe circuits are observed.
7. Unused cables and connection lines must be either connected to terminals, securely fixed
and isolated, or grounded.
8. If necessary, you can code the front sockets of the I/O modules and terminals so that the
terminals and the associated field devices can be assigned to exactly one front socket.
9. Plug the terminals into the front sockets of the corresponding I/O modules and screw the
terminals into place using the side screws.
10.Label the connection lines.
Danger!
Explosion hazard due to improperly wired front connectors
Improperly wired front connections can lead to dangerous confusions of intrinsically safe and
non-intrinsically safe circuits, causing explosive mixtures to ignite.
Always make sure that the front connectors are correctly wired.
