Installing Block I/O
Chapter 2
2-12
Table 2.E
Wiring Block Designationsfor Cat. No. 1791NDC
Connections
1791-NDC
Connections
Designation
Description
Terminal No.
Power Connections
+24
+24V dc Power
1
Power Connections
RET +24
dc Return
3
GND
Chassis ground
2
1
Transducer Power
2
+24V
For current input only
25
Remote I/O
BLU
Blue wire - RIO
6
Remote I/O
Connections
CLR
Clear wire - RIO
8
SHD
Shield - RIO
7
I/O Connections
inV0 thru inV3
Voltage Input 0 through 3
9, 13, 17, 21
Voltage Input
RET in0 thru
RET in3
Input Return 0 through 3
10, 14, 18, 22
inI0 thru inI3
Current Input 0 through 3
11, 15, 19, 23
Current Input
RET in0 thru
RET in3
Input Return 0 through 3
10, 14, 18, 22
Input Ground
GNDin0-GNDin3
Channels 0-3 ground
12, 16, 20, 24
3
Output
out 0 - RET out
0
Output 0 (+)
Return output 0 (-)
27
26
4
Output
out 1 - RET out
1
Output 1 (+)
Return output 1 (-)
29
28
4
Not used
For internal test only; not
for customer use.
4, 5, 30
1
Connect chassis ground to equipment grounding stud. These are not internally connected.
2
2028V dc (nominal 24V, 100mA) voltage source for accommodating looppowered current transducer inputs.
3
Terminals 12, 16, 20, and 24 are internally connected.
4
Terminals 26 and 28 internally connected together.
Table 2.F
Acceptable Wiring Cables for Block I/O Connection
Use
Cable Type
Remote I/O link
Belden 9463
Input and output wiring
Up to 14AWG (2mm
2
) stranded with 3/64 inch insulation
