Chapter 8: Installation and Wiring
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Do-more T1H Series PLC User Manual, 1st Edition, Rev. C
8-20
Wiring the I/O Module Bases
There are two types of terminal bases for the Terminator I/O modules: screw clamp and
spring clamp connectors. The recessed screw heads help minimize the risk of someone
accidentally touching active wiring.
WARNING: For some modules, field device power may still be present on the terminal block even
though the Terminator I/O system power is turned off. To minimize the risk of electrical shock, check
all field device power before you remove a wire.
Selecting Internal 24 VDC Power Supply
The DC input field devices can be powered from the integrated 24VDC power supply
from the power supply bus. The T1K-08ND3 and T1K-16ND3 DC input modules have
jumpers for selecting internal 24VDC power supply available for 2 and 3-wire field devices.
The analog I/O and DC output modules do not have direct access to the internal bussed
24VDC.
Terminal Type
Screw Type
Spring Clamp
Recommended Torque
1.77–3.54 lb·in
(0.2–0.4 N·m)
N/A
Recommended Screwdriver
Blade Size
0.02 in. x 0.125 in.
(0.5 mm x 3mm)
Push in on clamp using
screwdriver blade size:
(0.016 x 0.079 to 0.032 x 0.16) in.
(0.4 x 2 to 0 .8 x 4) mm
Wire Gauge
Solid conductor: 24–12 AWG
Stranded conductor: 24–12 AWG
Solid conductor: 24–14 AWG
Stranded conductor: 24–14 AWG
(Twist stranded conductors before
inserting into gate)
Jumpers located under top cover of T1K-08ND3 and T1K-16ND3
Position jumper to set the module
to sink or source current.
Position jumper to set the module to
provide internally bussed 24VDC or
if external power is to be supplied.
