Step 3: Connecting The Field Wiring; Wiring Guidelines - DirectLOGIC DL405 Manual

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Step 3: Connecting the Field Wiring

Wiring Guidelines

WARNING: To minimize the risk of personal injury or property damage,
remove all power from the PLC and field devices before wiring the module.
The D4–INT Interrupt Input Module features a
removable terminal block. It is held into place
by two retaining screws. You must first remove
the front cover of the module prior to wiring. To
remove the cover press the bottom tab of the
cover and tilt the cover up to remove it from the
module. Now loosen the retaining screws and
lift the terminal block away from the module.
Consider the following wiring guidelines.
1. There is a limit to the size of wire the modules can accept. The table lists the
maximum AWG for each module type (smaller wire is also acceptable). The
interrupt module follows the 16 point guidelines.
8 point
16-point
32-point (common)
32-point (other)
NOTE: 12 AWG Type TFFN or Type MTW can be used on 8pt. modules. 14 AWG
Type TFFN or Type MTW can be used on 16pt. modules. Other types of wire may be
acceptable, but it really depends on the thickness of the wire insulation. If the
insulation is too thick and you use all the I/O points, then the plastic terminal cover
may not close properly.
2. Always use a continuous length of wire, do not combine wires to attain a
needed length.
3. Use the shortest possible cable length.
4. Where possible, use wire trays for routing.
5. Avoid running wires near high energy wiring.
6. If possible, avoid running input wiring in close proximity to output wiring.
7. To minimize voltage drops when wires must run a long distance, consider
using multiple wires for the return line.
8. Where possible, avoid running DC wiring in close proximity to AC wiring.
9. Avoid creating sharp bends in the wires.
Module Maximum
Type
Retaining screw
Terminal screws
WG
12
14
20
24