Discrete Inputs and Outputs

Overview

The 170 AMM 090 01 TSX Momentum I/O base supports 4 discrete inputs and 2 discrete outputs. This section describes how to map I/O data between the I/O base and the CPU.

NOTE: You cannot commission the discrete I/O until parameters have been set for all six analog channels.

You must configure analog inputs and outputs, even if they are not being used, for the discrete inputs and outputs to operate.

Key

The discrete inputs and outputs are I/O mapped as word 5, the most significant word, as shown in the table below:

Word	Input Data	Output Data
1 = LSW	Value, input channel 1	Parameters for input channels 1 ... 4
2	Value, input channel 2	Parameters for output channels 1,2
3	Value, input channel 3	Value, output channel 1
4	Value, input channel 4	Value, output channel 2
5 = MSW	Discrete inputs	Discrete outputs

Number of Words

The processor sends two discrete output data bits in one 16-bit word to the I/O base.

The base returns four discrete input data bits, and possibly an error message, if one has been detected, to the processor in one 16-bit word.