A-B 1746-IH16 module Rockwell SLC 16 digital input

The module fits into any single slot for I/O modules in either an SLC 

500 modular system or an SLC 500 fixed system expansion chassis 

(1746-A2). It is a Class 1(1) module (uses eight input words and eight output words).

The module contains a removable terminal block providing 

connections for four thermocouple and/or analog input devices. 

There are two cold-junction compensation (CJC) sensors that 

compensate for the cold-junction at ambient temperature rather than 

at freezing 0 °C (32 °F). There are no output channels on the module. 

You configure the module with software rather than with jumpers or switches.

After completing power cycle checks, the module waits for valid

channel configuration data from your SLC ladder logic program

(channel status LED indicators are off). After channel configuration

data is transferred and channel enable bits are set for one or more

channels, the module turns on its channel status LED indicators. Then

it continuously converts the thermocouple or millivolt input to a value

within the range you selected for the channel.

Each time the module reads an input channel, the module tests that

data for a fault, for example, open-circuit, over-range, or under-range

condition. If it detects such a condition, the module sets a unique bit

in the channel status word and causes the channel status indicator to blink.

The SLC processor reads the converted thermocouple or millivolt data

from the module at the end of the program scan, or when

commanded by the ladder program. After the processor and module

determine that the data transfer was made without error, the data can be used in your ladder program.

Command Mode Operation All stepper motor operations are performed in command mode. 

This mode is entered by setting the mode flag (bit 15 in output word 0) to 0.

In command mode, the SLC Processor can issue commands and activate different operations or moves. The actions you can command are:

 • Absolute Moves

 • Relative Moves

 • Hold Moves

 • Resume Moves

 • Immediate Stop Operations

 • Homing Operations

 • Jogging Operations

 • Blend Moves

 • Preset Operations

 • Reset Errors

Diagnostic Mode

Use the configuration mode to select the diagnostic mode of operation. Once selected, 

the diagnostic mode allows you to test your program and wiring by connecting the loop back wires at the 

translator. The purpose of loop back diagnostics is to test the system wiring for electrical noise. 

The number of pulses received at the feedback should equal the commanded number of pulses at the end of the move. 

If they are not equal, the system may be experiencing problems due to electrical noise.

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