I/O Mapping

Overview

The 170 ADM 390 10 TSX Momentum I/O base supports 16 discrete inputs and 12 discrete outputs. This section contains information about the mapping of the I/O data into input words and output words.

I/O Map

The I/O base must be mapped as three input word and one output word, as follows:

Word	Input Data	Output Data
1	Fault detection status on the 12 outputs	Value for output channels 1 ... 12
2	Fault detection status on the 16 inputs	not used
3	Value for input channels 1 ... 16	not used

Fault Detection for Outputs

The following diagram shows how bits are assigned in the first input word:

Fault Detection for Inputs

The following diagram shows how bits are assigned in the second input word:

IEC vs. Ladder Logic

In order to correctly field wire the inputs/outputs and map the input/output data, you need to know which type of Momentum Adapter is mounted on the base.

Adapters may be either IEC compliant or 984 Ladder Logic compliant.

	IEC Compliant	984 Ladder Logic Compliant
Momentum Processor Adapters	All	None
Momentum Communication Adapters	All, except 170 NEF 110 21 170 NEF 160 21 170 FNT 110 00 170 FNT 110 01	170 NEF 110 21 170 NEF 160 21 170 FNT 110 00 170 FNT 110 01

Data Mapping

The figure below shows how data is mapped on the I/O base with an IEC Compliant adapter. When the I/O is mapped as discrete points (1x/0x) the MSB is assigned to Pin 1 and the LSB is assigned to Pin 16. When the I/O is mapped as a word or register (3x/4x) the MSB is assigned to Pin 16 and the LSB is assigned to Pin 1.

inputs

outputs

The figure below shows how data is mapped on the I/O base with a Ladder Logic Compliant adapter. When the I/O is mapped as discrete points (1x/0x) the MSB is assigned to Pin16 and the LSB is assigned to Pin 1. When the I/O is mapped as a word or register (3x/4x) the MSB is assigned to Pin 1 and the LSB is assigned to Pin 16.

inputs

outputs