6F3B0250
76 T1/T1S User’s Manual
4. Installation and Wiring
The applicable wire size is 0.3 mm2 (22 AWG) to 1. 25 mm2 (16 AWG). The table below
shows the recommended wire size.
Type of signal Recommended wire size
Power 1.25 mm2 (16 AWG)
Grounding 1.25 mm2 (16 AWG)
I/O signals 0.3 mm2 (22 AWG) to 0.75 mm2 (18 AWG)

4.4 Grounding

The optim um m ethod for gr ounding electronic equipment is to ground it separately fr om
other hig h- power systems, and t o ground more t han one units of elect r onic equipment
with a single-point g r ound.
Although t he T1/T1S has noise im m unity to be used in industrial operating conditions,
grounding is import ant for safety and reliability.
Check the grounding against the following criteria.
1. The T1/T1S must not become a path for a ground current. A high-frequency current is
particularly harmful.
2. Equalize the ground potentials when the expansion rack or unit is connected. Ground
the T1/ T1S and the expansion rack or unit at a single point.
3. Do not connect the ground of t he T1/T1S to that of high-power systems.
4. Do not use a gr ound t hat has an unstable impedance, such as paint ed scr ews, or
ground subj ect to vibration.
The grounding marked terminal (see below) is provided on the T1/T1S basic unit and the
expansion unit for grounding pur pose.
!CAUTION 1. Turn off power befor e wiring to minimize the risk of electrical shock .
2. Operation without grounding may cause electr ical shock or malfunction.
Connect the g r ound terminal on the T 1/ T1S to the system ground.
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