Presentation

Function

The 140 CRA 211 10 is a single channel Distributed I/O Interface, connected via a twisted pair Modbus Plus cable network. This DIO Drop Module provides the I/O with power from a 115/230 VAC source.

Illustration

The following figure shows the parts of the distributed I/O (DIO) module.

Rear Panel Switches

Two rotary switches (refer to the illustration and table below) are located on the rear panel of the CPU. They are used for setting Modbus Plus node addresses for the unit.

SW1 (the top switch) sets the upper digit (tens) of the address; SW2 (the bottom switch) sets the lower digit (ones) of the address. The illustration below shows the correct setting for an example address of 11.

Rear Panel Switches Figure

The following figure shows the SW1 top switch and the SW2 bottom switch.

Rear Panel Switches Table

The following table shows node addresses for the SW1 and SW2 switches.

Node Address	SW1	SW2
1 ... 9	0	1 ... 9
10 ... 19	1	0 ... 9
20 ... 29	2	0 ... 9
30 ... 39	3	0 ... 9
40 ... 49	4	0 ... 9
50 ... 59	5	0 ... 9
60 ... 64	6	0 ... 4

NOTE: Only addresses from 1 to 64 are valid.

If "0" or an address greater than 64 is selected, the "Modbus+" LED comes ON, steady, indicating that an invalid address was selected.