Allen-Bradley 1756-CFM User manual

ControlLogix Configurable
Flowmeter Module
Catalog Number 1756-CFM
User Manual Original Instructions

Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use
or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
Labels may also be on or inside the equipment to provide specific precautions.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which
may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage,
or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT Identifies information that is critical for successful application and understanding of the product.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage
may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach
dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc
Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory
requirements for safe work practices and for Personal Protective Equipment (PPE).

Rockwell Automation Publication 1756-UM010C-EN-P - June 2021 3
Table of Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Who Should Use This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Summary of Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 1
What is the Configurable
Flowmeter Module?
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Using a ControlLogix CFM Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Module Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Physical Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Understanding Module Input Capabilities. . . . . . . . . . . . . . . . . . . . . . . . . 12
Understanding Module Output Capabilities . . . . . . . . . . . . . . . . . . . . . . . 12
Using Module Identification and Status Information. . . . . . . . . . . . . . . 13
Chapter 2
Configurable Flowmeter
Operation in the
ControlLogix System
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Using RSNetWorx and the Programming Software . . . . . . . . . . . . . . . . 17
CFM Modules in Local Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CFM Modules in Remote Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Direct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Listen-Only Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Configurable Flowmeter Modules in a Local Chassis. . . . . . . . . . . . . . . . 19
Requested Packet Interval (RPI). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Configurable Flowmeter Modules in a Remote Chassis . . . . . . . . . . . . . 20
Chapter 3
Configurable Flowmeter Module
Features and Operational Modes
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Understanding General Module Features. . . . . . . . . . . . . . . . . . . . . . . . . . 21
Removal and Insertion Under Power (RIUP) . . . . . . . . . . . . . . . . . . . 21
Module Fault Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Fully Software Configurable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Electronic Keying. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Producer/Consumer Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Module Status Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Configurable Flowmetering Channels . . . . . . . . . . . . . . . . . . . . . . . . . 29
Flowmeter Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Gate Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
User-Defined Preset and Rollover Values. . . . . . . . . . . . . . . . . . . . . . . 30

4Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Current-Sourcing Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Choosing an Operational Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operating in High Resolution Frequency Mode . . . . . . . . . . . . . . . . . . . . 31
Terminal Usage in High Resolution Frequency Mode . . . . . . . . . . . 32
Output Operation in High Resolution Frequency Mode . . . . . . . . . 32
Module Features Used in High Resolution Frequency Mode . . . . . 32
Alarms in High Resolution Frequency Mode. . . . . . . . . . . . . . . . . . . . 34
Sample Configuration for High Resolution Frequency Mode. . . . . 34
Operating in Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Nonresettable Totalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Terminal Usage in Totalizer Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Output Operation in Totalizer Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Using the Totalizer Mode Prover Function. . . . . . . . . . . . . . . . . . . . . . . . . 36
Using a Prover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Features Available with the Prover Function. . . . . . . . . . . . . . . . . . . . 38
Alarms with the Prover Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Sample Configuration for Totalizer Mode Prover Function . . . . . . 43
Using the Totalizer Mode Filler Function . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Trickle Function for Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Configurable Features Available with the
Totalizer Mode Filler Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Alarms with the Filler Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Sample Configuration for Totalizer Mode Filler Function. . . . . . . . 51
Configurable Output Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
How To Enable Output Behavior Configuration . . . . . . . . . . . . . . . . 53
Chapter 4
Install the Configurable
Flowmeter Module
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Installing the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Keying the Removable Terminal Block/Interface Module . . . . . . . . . . . 58
Key the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Key the RTB/IFM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Wiring the Removable Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Connect Grounded End of the Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Connect Ungrounded End of the Cable . . . . . . . . . . . . . . . . . . . . . . . . 60
Connect Wires to the RTBs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Wiring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Standard Flowmeter Wiring Example . . . . . . . . . . . . . . . . . . . . . . . . . 61
Standard Prover/Detector Wiring Example 1 . . . . . . . . . . . . . . . . . . . 62
Standard Prover/Detector Wiring Example 2. . . . . . . . . . . . . . . . . . . 63
Standard Output Wiring Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Assembling the Removable Terminal Block and Housing . . . . . . . . . . . 65
Installing the Removable Terminal Block on the Module . . . . . . . . . . . . 65
Removing the Removable Terminal Block from the Module . . . . . . . . . 66
Removing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Rockwell Automation Publication 1756-UM010C-EN-P - June 2021 5
Chapter 5
Configure the Configurable
Flowmeter Module
What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Using This Chapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Overview of the Configuration Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Creating a New Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Communication Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Electronic Keying. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Using the Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Altering the Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Accessing the Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Changing Configuration Information at the Tags . . . . . . . . . . . . . . . . . . 78
Configurable Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Downloading Configuration Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Changing Configuration During CFM Module Operation . . . . . . . . . . . 80
Using Ladder Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Using Message Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Processing Real-Time Control and Module Services . . . . . . . . . . . . . 81
One Service Performed Per Instruction . . . . . . . . . . . . . . . . . . . . . . . . 81
Creating a New Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Enter Message Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Configuring CFM Modules in a Remote Chassis. . . . . . . . . . . . . . . . . . . . 86
Sample Configuration for High Resolution Frequency Mode . . . . . . . . 88
Sample Configuration for Totalizer Mode Prover Function. . . . . . . . . . 91
Sample Configuration for Totalizer Mode Filler Function . . . . . . . . . . . 96
Digital Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Appendix A
Troubleshooting the
Configurable Flowmeter Module
What This Appendix Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Using the Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Using Programming Software to Troubleshoot Your Module . . . . . . . 104
Determining Fault Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Using Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Appendix B
Software Configuration Tags Configuration Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Input Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Output Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

6Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Appendix C
Module Schematics What This Appendix Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Input Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Flowmeter Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Gate Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Output Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Discrete Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Appendix D
Frequency Accuracy Frequency Accuracy in High Resolution Frequency Mode . . . . . . . . . . 125
Calculate Frequency Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Frequency Accuracy in Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Calculate Frequency Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Appendix E
Configure Output Behavior with
RSLogix 5000 Version 16 and
Earlier
Configure the 1756-CFM for Use in a New Application . . . . . . . . . . . . . 130
Add the 1756-Generic Profile to the Program. . . . . . . . . . . . . . . . . . . 130
Copy and Paste the Tags and Logic from the Example to Your
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Specify the Configurable On/Off Behavior . . . . . . . . . . . . . . . . . . . . 133
Configure a 1756-CFM Module for Use in an Existing Application. . . 134
Add the 1756-Generic Profile to the Program. . . . . . . . . . . . . . . . . . . 134
Copy and Paste the Tags and Logic from the Example to Your
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Specify the Configurable On/Off Behavior . . . . . . . . . . . . . . . . . . . . 137
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Rockwell Automation Publication 1756-UM010C-EN-P - June 2021 7
Preface
This manual describes how to install, configure, and troubleshoot your
ControlLogix® Configurable Flowmeter (CFM) module, catalog number 1756-
CFM, herein referred to as the module.
Who Should Use This Manual You must be able to program and operate an Allen-Bradley®ControlLogix
controller to efficiently use your configurable flowmeter module.
Summary of Changes This table contains the changes made to this revision of the publication.
Additional Resources These documents contain additional information concerning related products
from Rockwell Automation.
You can view or download publications at
http:/www.rockwellautomation.com/literature/. To order paper copies of
technical documentation, contact your local Allen-Bradley distributor or
Rockwell Automation sales representative.
Topic Page
Updated Gross Rate formulas 42 and 49
Updated Net Rate formula 50
Added another Standard Prover/Detector wiring example 63
Digital Filter 101
Added Series B status indicators 103
Rising edge resets count. See Table 16 115
Added Series B module gate input schematic information 121
Added Series B module discrete output schematic information 123
Resource Description
1756 ControlLogix I/O Technical Data, publication
1756-TD002 Provides specifications for the ControlLogix controllers, I/O modules, specialty modules, chassis, power supplies and accessories.
ControlLogix System User Manual, publication
1756-UM001 Detailed description of how to use your ControlLogix operating
system.
ControlLogix Digital I/O Modules User Manual,
publication1756-UM058 Detailed description of how to install and use ControlLogix digital I/O
modules.
ControlLogix Analog I/O Modules User Manual,
publication 1756-UM009 Detailed description of how to install and use ControlLogix analog I/O modules.
ControlLogix High-speed Counter Module
Installation Instructions, publication 1756-IN018 Detailed description of how to install and use the ControlLogix high-
speed counter module.
Industrial Automation Wiring and Grounding
Guidelines, publication 1770-4.1 Provides general guidelines for installing a Rockwell Automation
industrial system.
Product Certifications website, http://
www.ab.com Provides declarations of conformity, certificates, and other certification details.

8Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Notes:

Rockwell Automation Publication 1756-UM010C-EN-P - June 2021 9
Chapter 1
What is the Configurable Flowmeter Module?
What This Chapter Contains This chapter describes the ControlLogix® configurable flowmeter module.
It also describes what you must know and do before using the module.
The ControlLogix CFM module is an intelligent I/O module that performs
high-speed flowmetering for industrial applications. The module is a single-
slot module that interfaces between a Logix controller and external I/O
devices.
The module interfaces with these output types:
• Magnetic Pickup
• TTL
•Preamps
Using a ControlLogix
CFM Module
ControlLogix CFM modules mount in a ControlLogix chassis and use a
removable terminal block (RTB) or a Bulletin 1492 interface module cable that
connects to an IFM 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.
To install these products, refer to these publications:
-ControlLogix Power Supply, publication 1756-IN619
- ControlLogix Redundant Power Supply, publication 1756-IN620
-ControlLogix Chassis, publication 1756-IN621
• ordered and received an RTB or IFM and its components for your
application.
IMPORTANT RTBs and IFMs are not included with your module.

10 Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
Chapter 1 What is the Configurable Flowmeter Module?
Module Features
These features available on the 1756-CFM module allow greater system
applicability:
• Two configurable flowmetering channels
• Flowmeter inputs
•Gateinputs
• Two current-sourcing outputs
• Removal and insertion under power
•CEmarked
•ULlisted
• CSA certified for Class I Division 2 hazardous locations
For a complete listing and detailed explanation of all the features available on
the ControlLogix CFM module, see Configurable Flowmeter Module Features
and Operational Modes on page 21.
Physical Features
•ControlLogix backplane connector - The backplane connector interface
for the ControlLogix system connects the module to the ControlLogix
backplane.
•Connectors pins - Input/output, power and grounding connections are
made to the module through these pins with the use of an RTB or IFM.
•Locking tab - The locking tab anchors the RTB or IFM cable on the
module, maintaining wiring connections.
•Slots for keying - Mechanically keys the RTB to prevent inadvertently
making the wrong wire connections to your module.
Indicators Locking Tab
Removable Terminal Block
Slots for
Keying the
RTB
Connector Pins
Top and
Bottom
Guides
ControlLogix Backplane
Connector
METERING
DC I/O
O
K
F
0
Z
0
F
1
Z
1
O
0
O
1