Spectrum Controls 1756sc-CTR8 User Manual

Owner’s Guide 0300199-01 Rev. B

CONTROLLOGIX™

COUNTER MODULE

Catalog Number: 1756sc-CTR8

Important Notes	1. Please read all the information in this owner’s guide before installing
	the product.
	2. The information in this owner's guide applies to hardware version A
	and firmware version 2.0 or later.
	3. This guide assumes that the reader has a full working knowledge of the
	relevant processor.
	Notice
	The products and services described in this owner's guide are useful in a
	wide variety of applications. Therefore, the user and others responsible
	for applying the products and services described herein are responsible
	for determining their acceptability for each application. While efforts
	have been made to provide accurate information within this owner's
	guide, Spectrum Controls assumes no responsibility for the accuracy,
	completeness, or usefulness of the information herein.
	Under no circumstances will Spectrum Controls be responsible or liable
	for any damages or losses, including indirect or consequential damages
	or losses, arising out of either the use of any information within this
	owner's guide or the use of any product or service referenced herein.
	No patent liability is assumed by Spectrum Controls with respect to the
	use of any of the information, products, circuits, programming, or
	services referenced herein.
	The information in this owner's guide is subject to change without notice.
	LimitedWarranty
	Spectrum Controls warrants that its products are free from defects in
	material and workmanship under normal use and service, as described in
	Spectrum Controls literature covering this product, for a period of 1 year.
	The obligations of Spectrum Controls under this warranty are limited to
	replacing or repairing, at its option, at its factory or facility, any product
	which shall, in the applicable period after shipment, be returned to the
	Spectrum Controls facility, transportation charges prepaid, and which
	after examination is determined, to the satisfaction of Spectrum Controls,
	to be thus defective.
	This warranty shall not apply to any such equipment which shall have
	been repaired or altered except by Spectrum Controls or which shall
	have been subject to misuse, neglect, or accident. In no case shall the
	liability of Spectrum Controls exceed the purchase price. The
	aforementioned provisions do not extend the original warranty period of
	any product which has either been repaired or replaced by Spectrum
	Controls.

Who Should Use

This Guide

What This Guide

Covers

Related Allen-

Bradley Documents

Preface

Read this preface to familiarize yourself with the rest of the owner’s guide. This preface covers:

•who should use this guide

•what this guide covers

•related Allen-Bradley documents

•terms & abbreviations you should know

Use this guide if you design, install, program, or maintain a control system that uses Allen-Bradley ControlLogix Controllers.

You should have a basic understanding of ControlLogix products. You should also understand electronic process control and the ladder program instructions required to generate the electronic signals that control your application. If you do not, contact your local Allen-Bradley representative for the proper training before using these products.

This guide covers the 1756sc-CTR8 counter/flow module. It contains the information you need to install, wire, use, and maintain these modules. It also provides diagnostic and troubleshooting help should the need arise.

Table A lists several Allen-Bradley documents that may help you as you use these products.

Table A. Related Allen-Bradley documents

Allen-Bradley Doc. No.		Title	Publication Number
1756-PA72, ControlLogix Power Supply Installation
-PB72	Instructions		1756-5.1
1756-A4,	ControlLogix Chassis Installation Instructions 1756-5.2
-A7, -A10,
-A13, -A17

vi	ControlLogix™ CounterModule

Terms &

Abbreviations You

Should Know

1756 Series ControlLogix Module Installation Instructions
(Each module has separate document for installation)	1756-5.5,
	-5.42
1756-L1, Logix5550 Controller User Manual	1756-6.5.12
-L1M1, -L1M2
1756-DHRIO ControlLogix Data Highway Plus
Communication Interface Module User Manual	1756-6.5.2
1756-ENET ControlLogix Ethernet Communication Interface
Module User Manual	1756-6.5.1

To obtain a copy of any of the Allen-Bradley documents listed, contact your local Allen-Bradley office or distributor.

You should understand the following terms and abbreviations before using this guide.

A/C - Refers to alternating current. This is a sine wave signal that is typically associated with magentic pickup flowmeters.

Attenuation – The reduction in magnitude of a signal as it passes through a system. The opposite of gain.

Channel – Refers to one of eight, small-signal analog input interfaces to the module’s terminal block. Each channel is configured for connection to a input device, and has its own configuration and status words.

Chassis – See rack.

Common mode rejection ratio (CMRR) - The ratio of a device’s differential voltage gain to common mode voltage gain. Expressed in dB, CMRR is a comparative measure of a device’s ability to reject interference caused by a voltage common to its terminal relative to ground.

Common mode voltage – The voltage difference between the negative terminal and analog common during normal differential operation.

Cut-off frequency - The frequency at which the input signal is attenuated 3 dB by the digital filter. Frequency components of the input signal that are below the cut-off frequency are passed with under 3 dB of attenuation for low-pass filters.

Preface

vii

DC - Direct Current - This is typically associated with a DC squarewave pulse signal from a flowmeter.

dB (decibel) – A logarithmic measure of the ratio of two signal levels.

Digital filter - A low-pass mathmatic single order filter applied to the signal. The digital filter provides high-frequency noise rejection.

Effective resolution – The number of bits in the channel data word that do not vary due to noise.

Local System - A control system with I/O chassis within several feet of the processor.

LSB (least significant bit) – The bit that represents the smallest value within a string of bits.

Normal mode rejection (differential mode rejection) – A logarithmic measure, in dB, of a device’s ability to reject noise signals between or among circuit signal conductors, but not between the equipment grounding conductor or signal reference structure and the signal conductors.

Module update time – See channel update time.

Remote system - A control system where the chassis can be located several thousand feet from the processor chassis. Chassis communication is via the 1756-DHRIO and 1756-ENET Adapter.

Resolution – The smallest detectable change in a measurement, typically expressed in engineering units (e.g. 0.15 °C).

Sampling time - The time required by the mocule to sample an input channel.

Step response time – The time required for the module to reach 95% of its expected, final value, given a full-scale step change in the output data word.

Tags - Identifiers for configuration, data, and status information found withing the module. Tags allow the user to modify specific module attributes and view data and status.

Update time – The time for the module to sample and convert a channel input signal and make the resulting value available to the ControlLogix processor.

viii	ControlLogix™ CounterModule

TableofContents	ix

Preface v

Chapter 1

Module Overview

Chapter 2

Installing Your

Module

Chapter 3

Operation in the

System

Chapter 4

Programming Your

Module

Table of Contents

Who Should Use This Guide ...................................................................................	v
What This Guide Covers ..........................................................................................	v
Related Allen-Bradley Documents ...........................................................................	v
Table A. Related Allen-Bradley documents .............................................................	v
Terms & Abbreviations You Should Know .............................................................	vi
General Description ..................................................................................................	1
Table 1.1 Hardware Features ....................................................................................	2
System Overview ......................................................................................................	2
Cables .......................................................................................................................	3
Installing And Wiring Your Module ........................................................................	1
Electrostatic Damage ................................................................................................	1
Power Requirements .................................................................................................	2
Module Installation and Removal ............................................................................	2
Wiring Your Module ................................................................................................	6
Wiring Single-ended Inputs .....................................................................................	7
Wiring Bi-Directional or Quadrature Inputs ............................................................	8
Operation Within the
ControlLogix System ..............................................................................................	17
Ownership and Connections ..................................................................................	17
Using RSNetWorx and RSLogix 5000 .....................................................................	17
Direct Connections .................................................................................................	18
Module Operation ..................................................................................................	18
Modules in a Local Chassis ...................................................................................	18
Requested Packet Interval (RPI) ............................................................................	19
Modules in a Remote Chassis ................................................................................	19
Listen-Only Mode ..................................................................................................	20
Multiple Owners of Input Modules .......................................................................	20
Configuration Changes in an Input Module with Multiple Owners ......................	21
Module Installation ................................................................................................	23
Adding Your Module to a Project ..........................................................................	23

x	ControlLogix™ CounterModule

Chapter 5 Configuring module attributes:

Configuration, Data,
and Status Tags ......................................................................................................	31
Send Configuration Data to the Module ................................................................	31
Configuration Tags .................................................................................................	32
Channel Specific Settings.......................................................................................	32
Output Tags ............................................................................................................	37
Input Tags ..............................................................................................................	37

Chapter 6

Programming

Examples

Initial Programming .................................................................................................	39
Figure 5.1 Sample Ladder Logic .............................................................................	40
Using the gate storage mode .................................................................................	42
Installation Recommendations ...............................................................................	44
Meter Proving .........................................................................................................	45

Chapter 7

Troubleshooting

Using Module Indicators to Troubleshoot ............................................................	45
Using RSLogix 5000 to Troubleshoot Your Module ..............................................	46
Module Configuration Errors .................................................................................	47

Chapter 8

Maintaining Your

Module

Appendix A

Module

Specifications

Appendix B

Programming Your

Module

Preventive Maintenance ........................................................................................	49
Safety Considerations ............................................................................................	49

Electrical Specifications ..........................................................................................	53
Environmental Specifications .................................................................................	54
Input Specifications ...............................................................................................	54
Accuracy ................................................................................................................	54

Module Installation ................................................................................................	57
Adding Your Module to a Project ..........................................................................	57
Declaration of Conformity ......................................................................................	64

Chapter 1

Module Overview

This chapter describes the counter module and explains how the ControlLogix controller reads analog input data from the module. Read this chapter to familiarize yourself further with your counter module. This chapter covers:

•general description and hardware features

•an overview of system and module operation

General Description This module is designed exclusively for use in the Allen-Bradley ControlLogix 1756 I/O rack systems. The module reads AC and DC pulse information from external sensors and stores it in its image table for retrieval by all ControlLogix processors.

Following is a list of features available on the CTR8 module that allow their use in a wide variety of applications.

·Removal and insertion under power (RIUP) - a system feature that allows you to remove and insert modules while chassis power is applied

·Producer/consumer communications - an intelligent data exchange between modules and other system devices in which each module produces data without having been polled

·System timestamp of data - 64 bit system clock places a timestamp on the transfer of data between the module and its owner controller within the local chassis

·IEEE 32 bit floating point format

·On-Board Features, such as custom User Scaling, Analog and Digital Filtering, and Under/Over Detection

·Class I/Division 2, UL, CUL, CE, and FM Agency Certification

2	ControlLogix™ CounterModule

Input Types

The 1756-CTR supports both AC and DC input signal types. The module input type is configured on a channel pair basis. Each pair must be configured for the same input type.

Hardware Features

The module fits into any single slot for I/O modules in a ControlLogix modular system. The module has a unique generic profile which may be configured using your RSLogix 5000 programming software.

The module utilizes one removable terminal block, that provides connections for the eight input channels. The module is configured through RSLogix 5000 software, defining input type, counter control and signal filtering.

Table 1.1 Hardware Features

Hardware	Function
OKLED	Displayscommunicationandfaultstatusofthemodule
SYSLED	Displaysafaultcondition
SideLabel(Nameplate)	Providesmoduleinformation
RemovableTerminalBlock	Provideselectricalconnectiontoinputdevices
DoorLabel	Permitseasyterminalidentification
SelfLockingTabs	Secure module in chassis slot
Terminal Block Switch	Locks the RTB to the module.

	Diagnostic LEDs
	The module contains diagnostic LEDs that help you identify the source of
	problems that may occur during power-up or during normal operation.
	Power-up and diagnostics are explained in Chapter 7, Testing Your
	Module.
System Overview	The module communicates with the ControlLogix processor and receives
	+5 Vdc and +24 Vdc power from the system power supply through the
	parallel backplane interface. You may install as many counter modules in
	the system as the power supply can support.
	Channels (0 through 7) can receive AC or DC input signals. Input types
	must be configured in channel pairs. Each channel reports both count data
	and rate data in independent registers. Extended status information is also
	available for each channel.

Chapter1:ModuleOverview

3

System Operation

At power-up, the module checks internal circuits, memory, and basic functions. During this time the SYS LED remains on. If the module does not find any faults, it turns off the SYS LED.

After completing power-up checks, the module wait for a connection to an owner controller then valid channel configuration data from your ladder logic program. After channel configuration data is transferred, and one or more channels are enabled, the module continuously converts the inputs to floating point data for use in your ladder program.

Each time the module reads an input channel, the module tests that data for a fault, i.e. signal mismatch, or out of range condition. If it detects an error condition, the module sets a unique bit in the status tags.

Module Operation

The module’s input circuitry consists of eight single-ended inputs, routed into an FPGA. The FPGA reads the input signals and converts them to counter and rate and then presents them in floating point values.. The input circuitry also supports gate inputs allowing you to disable and control counter operation.

Cables

Cable length should be kept to a minimum. Use the lowest capacitance shielded cable available. We recommend that you use Belden #9501 (or equivalent).

Table 1.2 Cable Specifications

Description	Belden #9501
When used?	AC/DCinputs.
Conductors	2,#24AWGtinnedcopper(7x32)
Shield	Beldfoilaluminumpolyestershieldw/copperdrainwire.	.
Insulation	PVC
Jacket	ChromePVC
Agency	NECTypeCM
Approval
Temperature	80°C
Rating

4	ControlLogix™ CounterModule

Electrostatic

Damage

Power

Requirements

Installing And Wiring Your Module

Read this chapter to install and wire your module. This chapter covers:

•avoiding electrostatic damage

•determining power requirements

•installing the module

•wiring signal cables to the module’s terminal block

Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins. Guard against electrostatic damage by observing the following precautions:

CAUTION

ELECTROSTATICALLY SENSITIVE COMPONENTS

•Before handling the module, touch a grounded object to rid yourself of electrostatic charge.

•When handling the module, wear an approved wrist strap grounding device.

•Handle the module from the front, away from the

backplane connector. Do not touch backplane connector pins.

• Keep the module in its static-shield container when not in use or during shipment.

Failure to observe these precautions can degrade the module’s performance or cause permanent damage.

The module receives its power through the ControlLogix chassis backplane from the fixed or modular +5 VDC and +24 VDC chassis power supply. The maximum current drawn by the module is shown in the table below.

Table 2.1. Maximum current drawn by the module

5VDC Amps	24VDC Amps
0.230	0.075

Module Installation

and Removal

Using your module in the ControlLogix System

Place your module in any slot of a ControlLogix modular, or modular expansion chassis.

An analog I/O module translates an analog signal into, or from, a corresponding digital representation which controllers can easily operate on for control purposes.

A ControlLogix I/O module mounts in a ControlLogix chassis and uses a Removable Terminal Block (RTB) to connect all field-side wiring.

Before you install and use your module you should have already:

·installed and grounded a 1756 chassis and power supply.

·ordered and received an RTB for your application.

Important: RTBs are not included with your module purchase.

Specify Allen Bradley Part Number:

1756-TBCH - 36 position screw terminals

1756-TBS6H - 36 position press terminals

When installing the module in a chassis, it is not necessary to remove the terminal blocks from the module. However, if the terminal blocks are removed, use the write-on label located on the side of the terminal blocks to identify the module location and type.

Preventing Electrostatic Discharge

This module is sensitive to electrostatic discharge.

ATTENTION: Electrostatic discharge can damage integrated circuits or semiconductors if you touch backplane connector pins. Follow these guidelines when you handle the module:

·Touch a grounded object to discharge static potential

·Wear an approved wrist-strap grounding device

·Do not touch the backplane connector or connector pins

·Do not touch circuit components inside the module

·If available, use a static-safe work station

·When not in use, keep the module in its static-shield box

Removal and Insertion Under Power

These modules are designed to be installed or removed while chassis power is applied.

ATTENTION: When you insert or remove a module while backplane power is applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

·sending an erroneous signal to your system’s field devices causing unintended machine motion or loss of process control.

·causing an explosion in a hazardous environment.

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connectors. Worn contacts may create electrical resistance that can affect module operation.

Compliance to European Union Directives

If this product bears the CE marking, 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 61010-1 and EN 61131-2, EN61000-6-2:2001, EN61000-6-4:2001

EN61010-1:2001

This product is intended for use in an industrial environment.

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 , EN61131-2:1994 + A11:1996 + A12:2000, see the appropriate sections in this publication, as well as the followingAllen-Bradley publications:

·Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1

·Automation Systems Catalog, publication B111

This equipment is classified as open equipment and must be installed (mounted) in an enclosure during operation as a means of providing safety protection.

CAUTION

POSSIBLE EQUIPMENT OPERATION

ATTENTION: The module is designed to support Removal and Insertion Under Power (RIUP). However, when you remove or insert an RTB with field-side power applied, unintended machine motion or loss of process control can occur. Exercise extreme caution when using this feature.

ATTENTION: Counter input isolated secondary circuits must be energy limited and limited to not source more than 5.8 amp into either the Counter inputs or the Gate inputs in the event of a component failure

WARNING

The 1756sc-CTR8 module is to be used only with the Allen-Bradley 1756 ControlLogix System.

To insert your module into the rack, follow these steps:

1. Align the circuit board of your module with the card guides at the top and bottom of the chassis.

Figure 2.1. Module insertion into a rack

2. Key the RTB in positions that correspond to unkeyed module positions. Insert the wedge-shaped tab on the RTB with the rounded edge first. Push the tab onto the RTB until it stops.

Keying the Removable Terminal Block

Key the RTB to prevent inadvertently connecting the incorrect RTB to your module.

When the RTB mounts onto the module, keying positions will match up. For example, if you place a U-shaped keying band in position #4 on the module, you cannot place a wedge-shaped tab in #4 on the RTB or your RTB will not mount on the module.

We recommend that you use a unique keying pattern for each slot in the chassis.

1. Insert the U-shaped band with the longer side near the terminals. Push the band onto the module until it snaps into place.

Figure 2.2. Terminal block diagram with keying

Wiring Your Module	Follow these guidelines to wire your input signal cables:
	• Power, input, and output (I/O) wiring must be in accordance with
	Class 1, Division 2 wiring methods [Article 501-4(b) of the National
	Electrical Code, NFPA 70] and in accordance with the authority having
	jurisdiction.
	• Peripheral equipment must be suitable for the location in which it is
	used.
	• Route the field wiring away from any other wiring and as far as
	possible from sources of electrical noise, such as motors, transformers,
	contactors, and ac devices. As a general rule, allow at least 6 in. (about
	15.2 cm) of separation for every 120 V of power.
	• Routing the field wiring in a grounded conduit can reduce electrical
	noise further.

•If the field wiring must cross ac or power cables, ensure that they cross at right angles.

•To limit the pickup of electrical noise, keep signal wires as far from power and load lines as possible.

•Ground the shield drain wire at only one end of the cable. The preferred location is at the shield connections at the ControlLogix chassis. (Refer to IEEE Std. 518, Section 6.4.2.7 or contact your sensor manufacturer for additional details.)

•Tighten screw terminals with care. Excessive tightening can strip a screw.

•Follow system grounding and wiring guidelines found in your ControlLogix Installation and Operation Manual.

Preparing and Wiring the Cables

To prepare and connect cable leads and drain wires, follow these steps:

Signal Wires

Cable

Drain Wire

(At the module-end of the cable, extract the drain wire but remove the foil shield.)

(Remove foil shield and drain wire from sensor-end of the cable.)

Signal Wires

1.At each end of the cable, strip some casing to expose individual wires.

2.Trim signal wires to 5-inch lengths beyond the cable casing. Strip about 3/16 inch (4.76 mm) of insulation to expose the ends of the wires.

3.At the module-end of the cables (see figure above):

-extract the drain wire and signal wires

-remove the foil shield

-bundle the input cables with a cable strap

4.Connect pairs of drain wires together, Channels 0 and 1, Channels 2 and 3, Channels 4 and 5, Channels 6 and 7. Keep drain wires as short as possible.

5.Connect the drain wires to the grounding lug on the PLC chassis.

6.Connect the signal wires of each channel to the terminal block. Important: Only after verifying that your connections are correct for each channel, trim the lengths to keep them short. Avoid cutting leads too short.

7.At the source-end of cables from devices:

-remove the drain wire and foil shield

-apply shrink wrap as an option

-connect to mV devices keeping the leads short

Important: If noise persists, try grounding the opposite end of the cable, instead (Ground one end only.)

Wiring Single-ended

Inputs The following figure shows the general terminal block layout. A single-ended input uses a pair of terminals, Hi(x) and Com. Gate lines are wired with their respective Gate(x) and Com terminals.

Single-ended Wiring

Unidirectional Input

Chassis

Ground

Hi 4	Hi 0
Com	Com
Gate 4	Gate 0
Com	Com
Hi 5	Hi 1
Com	Com
Gate 5	Gate 1
Com	Com
Hi 6	Hi 2
Com	Com
Gate 6	Gate 2
Com	Com
Hi 7	Hi 3
Com	Com
Gate 7	Gate 3
Com	Com
N/C	N/C
N/C	N/C

Wiring BiDirectional or Quadrature Inputs

Input use channel pairs, for example Hi2(A), Com, Hi2(B), Com. There is one gate input per channel pair.

Bi-directional/Quadrature Wiring

Bi-directional Input				Hi 3 (A)	Hi 0 (A)
				Com	Com
				Gate 3	Gate 0
				Com	Com
				Hi 3 (B)	Hi 0 (B)
Chassis				Com	Com
				N/C	N/C
Ground
				Com	Com
		A
				Hi 4 (A)	Hi 1 (A)
Quadrature Input
		Z		Com	Com
				Gate 4	Gate 1
		B		Com	Com
				Hi 4 (B)	Hi 1 (B)
Chassis				Com	Com
				N/C	N/C
Ground				N/C	N/C
				N/C	N/C
				N/C	N/C