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AN-X2-ABDHRIO Remote I/O Drive Interface
February 2013
Line 1 on the AN-X is closest to the power connector.
Check the wiring to ensure that line 1 on the AN-X is connected to line 1 on the PLC, and
so on.
Terminate both ends of a remote I/O network by using external resistors attached to the
physical ends of the network. There should be two and only two terminators on the
network.
Use 82 ohm resistors if the network operates at 230.4 kbps or if the network operates at
57.6 kbps or 115.2 kbps and none of the devices in the table below are present. The
maximum number of physical devices on the network is 32.
Use 150 ohm resistors if the network contains any of the devices in the table below, or if
the network operates at 57.6 kbps or 115.2 kbps and you do not require the network to
support more than 16 physical devices.
Device Type
Catalog Number
Series
Adapters
1771-AS
All
1771-ASB
Series A and B
1771-DCM
All
Miscellaneous
1771-AF
All
1771-AF1
All
Baud Rate
Maximum Cable Length
57.6 Kbaud
10000 ft
115.2 Kbaud
5000 ft
230.4 Kbaud
2500 ft
The most common causes of connection errors are:
•
wiring reversed (lines 1 and 2)
•
incorrect baud rate
•
other cabling and termination problems
•
duplicate or overlapping address
