Category: A-B

Features and Benefits

Select I/O modules to exactly match your application.

Combinationmodules allow you to have inputs and outputs in a single slot for efficient use of your chassis space.

Expand the I/O capacity of your fixed controller system.

Two discrete I/O modules can be added to the fixed controller’s 2-slot expansion

chassis increasing the flexibility of the system.

All relay contacts are Silver Cadmium with Gold overlay.

Gold plating resists oxidation and tarnishing resulting from non-use.

Silver Cadmium acts as an excellent conductor.

High-density 32-Point DC I/O and fast response DC inputs are available.

These modules allow you to apply the SLC 500 processors in a broader spectrum of control applications.

LEDs indicate the status of each I/O point.

Assisting you in troubleshooting, LEDs illuminate when the proper signal is received

at an input terminal, or when the processor applies power to an output terminal.

Terminal identification diagrams on each module.

Terminal identification diagrams are located on each module making terminal

identification easier.

An acceleration of 2 – 2500 pulses per second2 trapezoidal velocity profile. 

The thermal dissipation of the controller reaches a 1.5 Watts for both minimum and maximum. 

The application interfaces hold a stepper motor driver with a speed range of 1 – 250.000 pulses per second.

The 1746-HSTP1 module’s storage temperature is -40-85 Deg. Celsius and 0-60 Deg. 

Celsius operating/inlet air temperature. An altitude that is up to 200 meters with a relative humidity 5 – 95% non-condensing.

The Allen-Bradley 1746-HSTP1 is an intelligent module that is compatible with the SLC 500 controller platform. 

This module is a Stepper Control Module, used with encoder inputs to provide accurate control of stepper motors in motion and positioning control.

This particular module is compatible with Allen-Bradley fixed style SLC product with Two (2) Slot expansion and modular style 

processors such as SLC 5/01. SLC 5/02. SLC 5/03. SLC 5/04 and SLC 5/05 controllers. 

Via the 1746-ASB module, this intelligent module may also be used in larger Programmable Logic Controller (PLC) systems.

The integrated stepper motor controller’s absolute positioning count may reach over +/- 8.000.000 counts at pulse train velocities of 250 kHz. 

This module does not implement a closed loop control instead, the encoder feedback is used to verify movement of the axis to the correct position based on the user program.

Description

The Allen-Bradley 1746-HSTP1 is a stepper controller module. 

A single-slotted module capable of operating a wide variety of SLC 500 series processors. 

With a differential encoder motion that is programmable for more than 8.000.000 counts of absolute position.

The 1746-HSTP1’s feedback hardware adapts up to 250 kHz of any frequencies. 

It can provide 250 kHz pulse train output for micro-stepping applications. 

It uses loopback diagnostics and differential incremental encoder feedback devices. 

The 1746-HSTP1 provides a differential feedback that interfaces directly to +5 or +15 V encoders. 

The module has a 5″ x 2″ x 6″ (13 cm x 5 cm x 15 cm) estimated dimension and weighs 15 oz (0.43 kg) approximately. 

Programmable modes of operation reduce the need for setting a DIP switch.

The 1746-HSTP1 module has a 200 mA back-plane current at 5 volts and 90 mA at 24 volts. 

It has a 5V DC differential encoder or 12-24V DC single-ended auxiliary inputs. 

It provides a digital output for the translator with a 4 ms module update time. 

The controller module has a 7 – 30 mA at 5V DV pulse train switching. 

This stepper controller module interface directly to encoders with differential feedback with +5 or +15V signal. 

It is also compatible with transistors with differential input translators, single-ended TTL and interface for opto-couplers.

This module does not include DIP switches for setting and configuration.

The module provides quick operational diagnostics through its embedded LED indicators that provide feedback regarding programming errors, 

normal and abnormal operation and a faulted system. 

This module also has built-in loop diagnostics that monitors the pulse train commands provides to the module’s translator.

Use the table below to find the current requirements of the devices 

using backplane power. Those devices that are not included in the 

backplane calculations are included in the example’s user-side calculations.

Selecting a User-Side Power Supply

You must provide a power supply that meets your system 

requirements. The following devices require user-side power:

• SLC Servo Module

• Encoders

• I/O modules

• Estop circuitry

• Fast inputs and outputs

You must select a power supply that meets the specifications of a NEC 

class 2 power supply. The power supply must have +5V, ±15V 

capacity, and +24V capacity for fast I/O and Estop circuitry.

Example of the Calculations for User-Side Current Requirements 

In this example, the system includes:

• One seven-slot modular rack

• One 1747-L541 CPU module

• One 1746-IB8 DC input module with eight inputs @ +24V

• One 1746-OV8 DC output module with eight outputs @ +24V

• An SLC Servo Module system that contains:

• Two SLC Servo Modules

• Two termination panels

• Two Allen-Bradley 845H encoders

• Six fast inputs

• Two fast outputs

Example of Calculations for Backplane Current Requirements 

In this example, the system includes:

• One seven-slot modular rack

• One 1747-L543 CPU module

• One 1746-IB8 DC input module with eight inputs @ +24V

• One 1746-OV8 DC output module with eight outputs @ +24V

• An SLC Servo Module system that contains:

• SLC Servo Modules

• Termination panels

• Allen-Bradley 845H encoders

• Fast inputs

• Fast outputs

Using Fast Inputs and Outputs

The fast I/O (FIN1through FIN3, and FOUT1) are 24V DC compatible 

and are used with a user-side +24V power supply. Review potential

24V DC I/O devices for compatibility with the electrical specifications 

as shown in the table below.

The SLC Servo Module operates in two modes:

• Configuration 

• Command 

When operating in the configuration or the command mode, the status 

of the module is reported to the SLC processor.

Configuration Mode Operation

You can enter configuration mode only if the system is in Estop. In the 

SLC Servo Module, you configure the SLC Servo Module by using M 

files containing data provided by the SLC 5/03 (or versions listed 

above) processors. All configuration parameters are internal to the SLC 

Servo Module and stored in non-battery backed RAM.

In configuration mode, you select the proper setup configuration to 

match the servo drive and motor without setting switches and without 

special software. If you do not set up your own configuration, the 

configuration is set to the default setting.

SLC Servo Module Operation

The SLC Servo Module, compatible with the SLC family, is used with 

SLC 5/03 FRN 5.0 (and above) processors using RSLogix 500, AI500 or 

APS (version 5.0 or higher) software. Once the SLC processor is 

initiated, the execution of the motion block is independent of the scan 

time of the processor. Blended motion allows for complicated move 

profiles consisting of two to thirty-two segments. The blended move 

profiles are stored in the SLC Servo Module’s memory as a series of 

absolute moves and can be executed more than once. Other move or 

homing operations can be performed between blended move profiles.

The SLC Servo Module controls absolute position over a range of 32 

bits. The SLC Servo Module performs an origin search (also called 

homing) and automatically resets the absolute position to the home 

position when the SLC processor requests a search function after 

detecting one of the following: 

• Encoder marker

• Limit switch

• Limit switch and marker

SLC Servo Module Overview

The SLC Servo Module (catalog number 1746-HSRV) is compatible 

with the SLC 500 family and only used with SLC 5/03™ FRN 5.0, SLC 

5/04™, or SLC 5/05™ SLC Servo Modules. The SLC Servo Module is 

programmed for incremental, absolute or speed moves, depending on 

the application.

IMPORTANT

Place the SLC Servo Module as close to the SLC processor as possible

Command Mode Operation

Motor operations are performed in command mode. To operate in this 

mode, set the mode flag (bit 15 in output word 0) to 0. In the 

command mode, the SLC processor issues commands and activates 

the following operations or moves:

• Absolute moves 

• Incremental moves

• Speed moves

• Monitor moves

• Hold moves

• Unhold moves

• Blend moves

• Emergency stop operations

• Homing operations

• Preset operations

• Clear faults

• Alternate home moves

Short-Circuit/Overload Current Diagnostics

If a short-circuit or overload current condition occurs on an output channel:

1. The FLT LED flashes, provided that power is applied to the module. 5V dc via 

backplane and load power via an external supply is required.

2. Fuse status bit (FB1) is set (1) when the fuse is tripped. The module tries to 

reset the outputs at intervals of 500 ms. During each retry, the fuse status bit is 

reset (0). After the overload condition is corrected, the fuse status bit resets (0) 

automatically.

When FB1 is set, outputs 0 through 4 will not function.

3. All output channels will be turned off in the case of a short-circuit or overload condition.

Recovery from Channel Shutdown

1. Remove the SLC 500 system power and correct the conditions causing the 

short-circuit or overload current condition.

2. Restore the SLC 500 system power. The module automatically resets and 

resumes control of the output channel and associated load.

Auto Reset Operation

IMPORTANT

1746-HSCE2 outputs perform auto-reset under overload 

conditions. When an output channel overload occurs as 

described above, all channels turn off within milliseconds 

after the thermal cut-out temperature has been reached. While 

the overcurrent condition is present, the module tries resetting 

the outputs at intervals of 500 ms. If the fuse cools below the 

thermal cut-out temperature, all outputs will auto-reset and 

resume control of their external loads as directed by the 

module until the thermal cut-out temperature is again reached.

Removing power from an overloaded output channel would 

also allow the fuse to cool below the thermal cut-out 

temperature, allowing auto-reset to occur when power is 

restored. The output channel then operates as directed by the 

module until the thermal cut-out temperature is again reached.

To avoid auto-reset of output channels under overload 

conditions, monitor the fuse blown status bit (FB1) in the 

module’s status file and latch the output off when an 

overcurrent condition occurs. An external mechanical fuse 

can also be used to open an output circuit when it is overloaded.