Do-more H2 Series PLC User Manual, 1st Edition, Rev. F - H2-DM-M
8–15
Chapter 8: Installation and Wiring
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I/O Wiring Checklist
Use the following guidelines when wiring the I/O modules in your system.
1. There is a limit to the size of wire the modules can accept. The table below lists the suggested
AWG for each module type. When making terminal connections, follow the suggested torque
values.
NOTE:
16 AWG Type TFFN or Type MTW is recommended. Other types of 16 AWG may be acceptable, but
it really depends on the thickness and stiffness of the wire insulation. If the insulation is too thick or stiff
and a majority of the module’s I/O points are used, then the plastic terminal cover may not close properly
or the connector may pull away from the module. This applies especially for high temperature
thermoplastics such as THHN.
2. Always use a continuous length of wire, do not combine wires to attain a needed length.
3. Use the shortest possible wire length.
4. Use wire trays for routing where possible.
5. Avoid running wires near high energy wiring. Also, avoid running input wiring close to output
wiring where possible.
6. To minimize voltage drops when wires must run a long distance , consider using multiple wires for
the return line.
7. Avoid running DC wiring in close proximity to AC wiring where possible.
8. Avoid creating sharp bends in the wires.
9. To reduce the risk of having a module with a blown fuse,
we suggest you add external fuses to your I/O wiring. A fast
blow fuse, with a lower current rating than the I/O module
fuse can be added to each common, or a fuse with a rating
of slightly less than the maximum current per output point
can be added to each output. Refer to our catalog for a
complete line of DINnectors, DIN rail mounted fuse
blocks.
Module type
Suggested AWG Range
Suggested Torque
4 point
16–24 AWG
7.81 lb·in (0.882 N·m)
8 point
16–24 AWG
7.81 lb·in (0.882 N·m)
12 point
16–24 AWG
2.65 lb·in (0.3 N·m)
16 point
16–24 AWG
2.65 lb·in (0.3 N·m)
H2-DM1E
DINnector External Fuses
(DIN rail mounted Fuses)
RS-232
SERIAL
USB
PGM
PORT
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