Rockwell Automation 1771-IGD TTL Input Module Installation Instructions User Manual
Page 9
TTL Input Module
9
Publication 1771ĆIN022B-EN-P - September 2002
Chassis Ground
SingleĆpoint Grounding
I/O chassis side plate
star washer
nut with captive washer
ground lug
1
ground lug
nut with captive washer
19480
When you connect grounding conductors to the I/O chassis grounding
stud, place a star washer under the first lug, then place a nut with captive
lock washer on top of each ground lug. Torque the nut with captive washer
to 18(+3) pound-inches.
grounding stud
1
Use the cup washer if crimpĆon lugs are not used.
#10 threadĆforming screw
externalĆtooth washers
19923
Use singleĆpoint grounding for extendedĆlocal I/O system
The systems must be grounded properly for proper
performance.
!
ATTENTION
!
6. You must connect both ends of the insulated signal return wire in
each transmission cable as follows:
•
connect one end to the dc common terminal of your +5V dc
Class 2 power supply
•
connect the other end to the dc common terminal of the field
wiring arm
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