In addition, an Accumulated Counter, the module provides a Rate Counter to 

determine Rate Measurement by indicating the pulse input frequency in Hz. (See 

the block diagram on page 6.) The Rate Measurement is determined by 

accumulating input pulses over a fixed period of time. You set the Rate Period to 

best match your application requirements.

Background Rate calculation is provided in Sequencer and Range Modes. This 

operation accepts input rates up to 32,767 Hz. The dynamically configurable Rate 

Period ranges from 10 ms to 2.55 seconds. 

The module’s four current sink (open collector) outputs can be controlled in the 

user program or the module.

Control of the counter reset is configured through user-set parameters. The counter 

can be reset from any combination of the Z input, Limit Switch input, or Soft Reset control bits.

Module operation is determined by selections made in the Setup and Control Word 

(M0:e.1). Setting the Function Control bit to 1 triggers the module to start the 

proper pulse counter, rate measurement, and output control functions. Many 

parameters are dynamic and can be changed without disrupting counter operation. 

The module’s block diagram is shown on page 6. Inputs from the terminal block 

enter the diagram at the left, outputs to the terminal block exit at the right. M0 and 

Output file parameters from the SLC enter the logic blocks from the top. Input file 

data to the SLC exit the logic blocks from the bottom.

High-Speed Counter Module Overview

The High-Speed Counter Module, Catalog Number 1746-HSCE is an SLC 500 family 

compatible device except with the 1747-ASB Remote I/O Adapter Module. It can be 

used with SLC™ 5/02 (and above) processors.

The module’s bidirectional counting ability allows it to detect movement in either 

direction. In addition, x2 and x4 counting modes are provided to fully use the 

capabilities of high-resolution quadrature encoders.

High-speed inputs from quadrature encoders and various high-speed switches are 

supported. Accepting input pulse frequencies of up to 50k Hz allows precise 

control of fast motions.

Two dip switches (SW1 and SW2) and one jumper (JW1) are located on the side of  the module. 

• SW1 selects the type of input (single ended or differential). 

• SW2 selects the output voltage range (4.5 to 10V dc or 10 to 30V dc). 

• JW1 selects the filtering rate (300 µs or 10 ms) used to debounce the limit  switch input.

Install the Module 

Installation procedures for this module are the same as for any other discrete I/O or  specialty module.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC

Low Voltage, by applying the safety requirements of EN 61131–2

Programmable Controllers, Part 2 – Equipment Requirements and Tests.

For specific information required by EN 61131-2, see the appropriate

sections in this publication, as well as the following Allen-Bradley publications:

Industrial Automation Wiring and Grounding Guidelines 

(for noise immunity), publication 1770-4.1

Automation Systems Catalog, publication B111

Wiring the Module

Installing the Ferrite Collar

For immunity to electrical noise with this CE-marked module, insert

ferrite collar (Fair-Rite Inc. part number 0443164151) around the input

cables immediately beneath the module in the I/O chassis. 

Do this as follows:

1. Bundle the cables at the module end.

2. Fold the collar so that it encircles the cables.

3. Press the plastic housing until the collar snaps together.

4. Check that the collar is fully latched.

5. If the collar slides on the cables, use a cable tie to secure it.

To the Installer

This publication states compliance with directives required for using

analog I/O modules with the CE mark within the European Union or

EEA regions. It also provides instructions for inserting a ferrite collar

on the module’s input cable(s) for compliant immunity to electrical

noise. Use these instructions as a supplement to the user manual,

Compliance with European Union Directives

If this product has the CE mark, it is approved for installation within

the European Union and EEA regions. It has been designed and tested

to meet the following directives.

EMC Directive

This product is tested to meet Council Directive 89/336/EEC

Electromagnetic Compatibility (EMC) and the following standards,

in whole or in part, documented in a technical construction file:

EN 50081-2

EMC – Generic Emission Standard, Part 2 – Industrial Environment

EN 50082-2

EMC – Generic Immunity Standard, Part 2 – Industrial Environment

This product is intended for use in an industrial environment.

Temperature Control Using a BTM Module in an SLC System

The temperature control module is an intelligent I/O module that can 

provide a maximum of 4 PID loops for temperature control. The 

module has 4 analog thermocouple (TC) inputs. Each analog input 

functions as the process variable (PV) for a PID loop. The PID 

algorithm and tuning–assisted–process (TAP) algorithm are performed 

on the module for each of the loops. The control–variable (CV) 

output of each loop, either analog output or time–proportioned 

output (TPO), is sent from the module to the SLC data table. Your 

application ladder logic must access the CV value in the data table and 

send the analog or TPO data to an output module to close the loop.

Features of the Temperature Control Module

The 1746–BTM module provides:

• 4 independent temperature control loops

• autotune PID loops (one loop or any combination of loops can 

be autotuned while other loops are running)

• a unique start–up algorithm to minimize overshoot

• an isolated thermocouple (J and K) input for each PID loop

• 16–bit analog–to–digital converter resolution (0.1° resolution)

• a heat CV signal (for each PID loop) as a numeric % value

• a cool CV signal (for each PID loop) as a numeric % value

• a heat CV signal (for each PID loop) as a TPO bit

• a cool CV signal (for each PID loop) as a TPO bit

• temperature values in C ° or F °

• self–calibration (external reference required)

• user–selectable high and low alarms with dead band for hysteresis

• input open–circuit detection

The 1746-BTM module is compatible with any SLC processor that 

supports M0/M1 files, such as the SLC 5/05, SLC 5/04, SLC 5/03, and 

SLC 5/02 controllers.

Vocabulary

In this manual, we refer to:

• the barrel temperature control module as the “1746-BTM 

module,” the “BTM module,” or as “the module”

• the programmable controller as the “SLC processor”, or “the processor”

• a thermocouple as a “TC”

• a time-proportioned output as “TPO”

• the tuning-assisted processes as “TAP”

• proportional-integral-derivative as “PID”

• cold-junction compensation as “CJC”

Current CV

Your ladder logic should read the numeric value (current CV), scale it, 

and send it to an analog output module to generate the control signal 

to an analog temperature control actuator. If using the sample 

program look for current CVs in N10:208–211 for loops 1–4. 

TPO

The module returns the heat TPO (bit 6) and cool TPO (bit 7) in input 

image table words 8–11 for loops 1–4. The sample program sends 

TPO signals to a digital output module to generate the control signal 

to a digital temperature control actuator.