Rockwell Automation 1791-IOBB USER MANUAL - Manual (Page 14)

Installing Block I/O
Chapter 2
2Ć5
Table 2.B
Wiring Block Designations
Connector
1791-IOBA 1791-IOBB
Connector
Designation Description Designation Description
Remote I/O Connector 1 Blue wire - RIO 1 Blue wire - RIO
2 Clear wire - RIO 2 Clear wire - RIO
SHD Shield - RIO SHD Shield - RIO
A DH-485 A A DH-485 A
B DH-485 B B DH-485 B
COM DH-485 Common COM DH-485 Common
+24 +24V dc +24 +24V dc
DCN dc neutral DCN dc neutral
CG Chassis ground CG Chassis ground
I/O Connector VDC Output supply VDC Output supply
O0 thru O7 Output 0 thru 7 O0 thru O5 Output 0 thru 5
I0 thru I7 Input 0 thru 7 I0 thru I9 Input 0 thru 9
COM Input common COM Input common
Power Supply Requirements
An external 24V dc power supply is required to power the block. Total
current required to power the block is equal to 200mA plus an inrush of
5.5A for 10
µ
sec for each block. The supply must be able to source an
additional 100mA plus an inrush current of 400mA when a peripheral is
connected.
In addition, the external power supply should have current limiting
capabilities. The voltage range must not exceed 20.5–27.6V dc.