Rice Lake Allen-Bradley Remote I/O - Manual (Page 7)

Installation 3
2.1.1 Termination Resistance
If the Remote I/O Interface is the last, or only, device
attached to the PLC, the interface must provide a
termination resistance. Use Table 2-1 to determine the
appropriate termination resistance value and JMP4
jumper position for the network. If the Remote I/O
Interface is not the last device in a chain, position the
jumper on one pin only. Resistance values for the
jumper positions are marked on the Remote I/O
Interface card.
Table 2-1. JMP4 Jumper Positions and Termination
Resistance Values
Network Data
Rate
Maximum
Cable Length
Maximum
Nodes
JMP4
Termination
Resistance
57.6 Kbps 10 000 ft 16 150

115.2 Kbps 5000 ft
230.4 Kbps 2500 ft 32 82

2.1.2 A-B Network Connections
Connections to the Allen-Bradley network are made at
connector J2 on the Remote I/O Interface card (see
Figure 2-2). Connectors 4–6 are tied to connectors
1–3 to allow daisy-chaining through the Remote I/O
Interface.
Feed Allen-Bradley network cable through cord grip.
Allow enough cable for routing along inside of
enclosure to J2 connector on the Remote I/O Interface
card. Connect Allen-Bradley network cables into
connector J2 on the Remote I/O Interface card, then
use cable ties to secure network cables to the cable tie
mounts.
2.1.3 LED Status Indicator
A single LED on the Remote I/O card provides status
information for troubleshooting (see Figure 2-2).
Table 2-2 summarizes the function of the LED.
Table 2-2. Remote I/O Interface Status LED
LED Function
OFF Not initialized or not receiving valid frames
Pulsing
(2Hz)
Communications established with Command
1’s or timeout
ON Valid communications established with
Command 2’s