A-B 1746-IC16 module Rockwell SLC 16 digital input

Fuse Protection (1746-OBP16 and 1746-OVP16 modules) 

The fuse on the 1746-OBP16 and 1746-OVP16 modules (shown on page 10) 

provides short-circuit protection for 13 mm2 (16 AWG) or larger wiring to external 

loads. In the event of a short circuit on an output channel, it is likely that the 

transistor associated with that channel will be damaged. In this event the module 

should be replaced or the load moved to a spare output channel.

The fuse does not provide overload protection. In the event of an overload on an 

output channel, it is likely that the fuse will not blow and the transistor associated 

with that channel will be damaged. To provide overload protection for your 

application, user-supplied fuses should be installed externally and properly sized to 

match your individual load characteristics.

Fuse Protection (1746-OAP12 modules)

A fuse is provided on each common of the 1746-OAP12 module (shown on page 

11) for a total of two fuses. The fuses are designed to protect the module from 

short-circuit conditions. The fuse does not provide overload protection. In the event 

of an overload on an output channel, it is likely that the fuse will not blow and the 

output device associated with that channel will be damaged. To provide overload 

protection for your application, user-supplied fuses should be installed externally. 

The recommended fuse for overload protection is SAN-O HT. Select the fuse rating 

according to your load. Do not use HT fuses rated higher than 2.0 Amps.

The Module overview will permit you to understand the basic functions of the Module and hardware requirements.

 The Module, catalog number 1746–HSTP1, is an SLC 500 family compatible device. It can be used with any SLC 500 Processor.

 The Module is configured through the SLC 500 backplane and requires no switch settings. 

Motion can be programmed in either direction for over ±8,000,000 counts of absolute position.

An optional incremental encoder may be used to verify the position reached by the axis. 

The Module does not automatically close a position loop in engineering units. 

The feedback hardware can accept frequencies of up to 250 kHz for use as either loop back diagnostics or differential incremental encoder feedback devices.

The Module can be programmed for either incremental or absolute moves, depending on the application.

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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