Rockwell Automation 1771-DA,D17716.5.13 U MNL 1771-DA ASCII I/O MODULE - Manual (Page 50)

Choosing Module Features
Chapter 3
3Ć8
Figure 2.4
Current Loop Connections (500 ft. max): Device is Passive Transmit, Passive Receive
(Refer to specifications in Appendix D)
12
24
Transmitted Data
(+)
Drain Wire (Shield)
To I/O
Chassis
Ground 1
ASCII Module Device
Belden
8723
or
Equiv.
1
Return
Passive
Receive
(-)
13
11
Received Data
(+)
Return
Transmit with
Current Source
(-)
Solder an external ground wire (14 ga.) to the drain wire at the cable connector.
Connect it to the I/O chassis ground lug. Ground the shield at this end only.
11824
Passive Transmit
Passive Receive
Power
Supply
+ -
4-20mA mark state
Figure 2.5
Current Loop Connections (500 ft max.): Device is Active Transmit, Active Receive
(Refer to specifications in Appendix D)
12
24
Transmitted Data
(+)
Drain Wire (Shield)
To I/O
Chassis
Ground 1
ASCII Module Device
Belden
8723
or
Equiv.
1
Return
Passive
Receive
(-)
11
18
Received Data
(+)
Return
Passive
Transmit
(-)
Solder an external ground wire (14 ga.) to the drain wire at the cable connector.
Connect it to the I/O chassis ground lug. Ground the shield at this end only.
11825
Transmit with
Current Source
Receive with
Current Source
NOTE: Device and its power supply must float in respect to the module for passive transmit.
.