Rockwell Automation 1756-CFM User Manual

Download

User Manual

ControlLogix Configurable Flowmeter Module

Catalog Numbers 1756-CFM

Important User Information

IMPORTANT

Solid-state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (publication SGI-1.1 your local Rockwell Automation® sales office or online at http://www.rockwellautomation.com/literature/ important differences between solid-state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid-state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

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.

available from

) describes some

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.

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.

Identifies information that is critical for successful application and understanding of the product.

Allen-Bradley, Rockwell Software, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

Summary of Changes

This manual contains new and updated information. Changes throughout this revision are marked by change bars, as shown to the right of this paragraph.

New and Updated Information

This table contains the changes made to this revision.

Topic Page

The Gross Rate for the Prover Function has been updated. 48

The Configurable Output Behaviors section has been added. 58

The Attention and Warning tables have been updated. 61

Detailed filtering information has been added to the Configurable Flowmeter Module Configuration Tags table.

The Configure Output Behavior with RSLogix 5000 Version 16 and Earlier appendix has been added.

122 and 124

147

3Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

4 Summary of Changes

Notes:

4Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Table of Contents

Preface

What is the Configurable Flowmeter Module?

Configurable Flowmeter Operation in the ControlLogix System

Who Should Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Chapter 1

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Using a ControlLogix

CFM Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Module Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Physical Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Understanding Module Input Capabilities . . . . . . . . . . . . . . . . . . . . . . 15

Understanding Module Output Capabilities . . . . . . . . . . . . . . . . . . . . . 15

Using Module Identification and Status Information. . . . . . . . . . . . . . 16

Chapter 2

What This Chapter Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Using RSNetWorx and RSLogix 5000 . . . . . . . . . . . . . . . . . . . . . . . . . 19

CFM Modules in Local Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

CFM Modules in Remote Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . 20

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Direct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Listen-Only Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Configurable Flowmeter Modules in a Local Chassis . . . . . . . . . . . . . 23

Requested Packet Interval (RPI). . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Configurable Flowmeter Modules in a Remote Chassis. . . . . . . . . . . . 24

Configurable Flowmeter Module Features and Operational Modes

5Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Chapter 3

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Understanding General Module Features . . . . . . . . . . . . . . . . . . . . . . . 25

Removal and Insertion Under Power (RIUP) . . . . . . . . . . . . . . . . 26

Module Fault Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Fully Software Configurable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Producer/Consumer Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Module Status Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Configurable Flowmetering Channels . . . . . . . . . . . . . . . . . . . . . . 34

Flowmeter Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Gate Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

User-Defined Preset and Rollover Values . . . . . . . . . . . . . . . . . . . 35

Current-Sourcing Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6 Table of Contents

Choosing an Operational Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Operating in High Resolution Frequency Mode . . . . . . . . . . . . . . . . . 36

Terminal Usage in High Resolution Frequency Mode. . . . . . . . . . 37

Output Operation in Frequency Mode. . . . . . . . . . . . . . . . . . . . . . 37

Module Features Used in High Resolution Frequency Mode . . . . 38

Alarms in High Resolution Frequency Mode. . . . . . . . . . . . . . . . . 40

Sample Configuration for High Resolution Frequency Mode. . . . 40

Operating in Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Nonresettable Totalizer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Terminal Usage in Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . . . 41

Output Operation in Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . 41

Using the Totalizer Mode Prover Function . . . . . . . . . . . . . . . . . . . . . 42

Using a Prover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Features Available with the Prover Function. . . . . . . . . . . . . . . . . 44

Alarms with the Prover Function . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Sample Configuration for Totalizer Mode Prover Function . . . . . 49

Using the Totalizer Mode Filler Function. . . . . . . . . . . . . . . . . . . . . . . 50

Trickle Function for Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . 51

Configurable Features Available with the

Totalizer Mode Filler Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Alarms with the Filler Function . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Sample Configuration for Totalizer Mode Filler Function . . . . . . 57

Configurable Output Behaviors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

How To Enable Output Behavior Configuration . . . . . . . . . . . . . 59

Installing the Configurable Flowmeter Module

Chapter 4

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Keying the Removable Terminal Block/Interface Module . . . . . . . . . 65

Key the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Key the RTB/IFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Wiring the Removable Terminal Block. . . . . . . . . . . . . . . . . . . . . . . . . 66

Connect Grounded End of the Cable. . . . . . . . . . . . . . . . . . . . . . . 67

Connect Ungrounded End of the Cable. . . . . . . . . . . . . . . . . . . . . 67

Connect Wires to the RTBs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Wiring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Standard Flowmeter Wiring Example. . . . . . . . . . . . . . . . . . . . . . . 70

Standard Prover/Detector Wiring Example. . . . . . . . . . . . . . . . . . 71

Standard Output Wiring Example . . . . . . . . . . . . . . . . . . . . . . . . . 72

Assembling the Removable Terminal Block and Housing. . . . . . . . . . 73

Installing the Removable Terminal Block on the Module . . . . . . . . . . 73

Removing the Removable Terminal Block from the Module . . . . . . . 74

Removing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

6Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module

Table of Contents 7

Chapter 5

What this Chapter Contains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Using this Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Overview of the Configuration Process . . . . . . . . . . . . . . . . . . . . . . . . 78

Creating a New Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Communications Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Using the Default Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Altering the Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Accessing the Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Changing Configuration Information at the Tags . . . . . . . . . . . . . . . . 86

Configurable Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Downloading Configuration Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Changing Configuration During CFM Module Operation . . . . . . . . . 88

Using Ladder Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Using Message Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Processing Real-Time Control and Module Services . . . . . . . . . . . 89

One Service Performed Per Instruction . . . . . . . . . . . . . . . . . . . . . 89

Creating a New Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Enter Message Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Configuring CFM Modules in a Remote Chassis . . . . . . . . . . . . . . . . . 95

Sample Configuration for High Resolution Frequency Mode . . . . . . . 97

Sample Configuration for Totalizer Mode Prover Function . . . . . . . 101

Sample Configuration for Totalizer Mode Filler Function . . . . . . . . 108

Troubleshooting the Configurable Flowmeter Module

Software Configuration Tags

Schematics

Appendix A

What this Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Using the Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Using RSLogix 5000 to Troubleshoot Your Module . . . . . . . . . . . . . 117

Determining Fault Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Using Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Appendix B

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Appendix C

What This Appendix Contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Input Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Flowmeter Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Gate Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Output Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

Discrete Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

7Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

8 Table of Contents

Frequency Accuracy

Configure Output Behavior with RSLogix 5000 Version 16 and Earlier

Appendix D

Frequency Accuracy in High Resolution

Frequency Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Calculate Frequency Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Frequency Accuracy in Totalizer Mode . . . . . . . . . . . . . . . . . . . . . . . 143

Calculate Frequency Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Appendix E

Configure the 1756-CFM for Use in a New Application. . . . . . . 148

Configure a 1756-CFM for Use in an Existing Application . . . . 152

Glossary

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

8Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Preface

This manual describes how to install, configure, and troubleshoot your ControlLogix

Configurable Flowmeter module.

Who Should Use This Manual

Additional Resources

You must be able to program and operate an Allen-Bradley® ControlLogix controller to efficiently use your Configurable Flowmeter module.

These documents contain additional information concerning related products from Rockwell Automation.

Resource Description

1756 ControlLogix I/O Technical Data, publication 1756-TD002

ControlLogix System User Manual, publication

ControlLogix Digital I/O Modules User Manual, publication

ControlLogix Analog I/O Modules User Manual, publication

ControlLogix High-speed Counter Module Installation Instructions, publication

1756-IN018

Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

1756-UM001

1756-UM058

1756-UM009

Provides specifications for the ControlLogix controllers, I/O modules, specialty modules, chassis, power supplies and accessories.

Detailed description of how to use your ControlLogix operating system.

Detailed description of how to install and use ControlLogix digital I/O Modules.

Detailed description of how to install and use ControlLogix analog I/O Modules.

Detailed description of how to install and use the ControlLogix High-speed Counter Module.

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.

You can view or download publications at

http:/www.rockwellautomation.com/literature/

technical documentation, contact your local Allen-Bradley distributor or Rockwell Automation sales representative.

9Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

. To order paper copies of

10 Preface

Notes:

10Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Chapter

What is the Configurable Flowmeter Module?

What this Chapter Contains

This chapter describes the ControlLogix Configurable Flowmeter (1756-CFM) module. It also describes what you must know and do before using the module.

Topic Page

Using a ControlLogix CFM Module 12

Understanding Module Input Capabilities 15

Understanding Module Output Capabilities 15

Using Module Identification and Status Information

The ControlLogix CFM module is an intelligent I/O module that performs high-speed flowmetering for industrial applications. The CFM module is a single-slot module that interfaces between a Logix controller and external I/O devices.

The module interfaces with the following output types:

 Magnetic Pickup

 TTL

 Preamps

11Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

12 What is the Configurable Flowmeter Module?

IMPORTANT

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 the ControlLogix Chassis and Power Supplies Installation Instructions, publication 1756-IN005

 ordered and received an RTB or IFM and its components for your

application.

RTBs and IFMs are not included with your module.

Module Features

The following are some of the features available on the ControlLogix CFM module that allow greater system applicability.

 2 Configurable Flowmetering channels

 Flowmeter inputs

 Gate inputs

 2 current-sourcing outputs

 Removal and insertion under power

 CE marked

 UL listed

 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 25.

12Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Physical Features

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

F0Z0F1Z

O0O

40200-M

What is the Configurable Flowmeter Module? 13

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.

Status indicators - Indicators display the status of communication, module health and input/output devices. Use these indicators to help in troubleshooting.

Top and bottom guides - Guides provide assistance in seating the RTB or IFM cable onto the module.

13Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

14 What is the Configurable Flowmeter Module?

42731

Pulse output

Fuel

Monitors fuel flow and total gallons

Generator

Electricity

Shaft encoder

Tur bi ne

Shaft speed

1756-CFM

Logix controller

The controller monitors shaft speed, performs PID calculations and adjusts valve by a 1756-OF6VI analog output module.

1756-OF6VI

Typical Applications

You can use the CFM module in power management, automotive, food and beverage, and oil and gas industries for various flow and/or turbine metering applications.

This figure shows a CFM module in a turbine shaft speed monitoring application. In this example, the 1756-CFM module is operating in high resolution frequency mode. Other examples are shown in Chapter 3 to reflect the various operational modes available on the 1756-CFM module.

For a detailed explanation of how the CFM module works with other portions of a ControlLogix control system, see Chapter 2, Configurable Flowmeter Operation in the ControlLogix System.

14Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

What is the Configurable Flowmeter Module? 15

IMPORTANT

Understanding Module Input Capabilities

Understanding Module Output Capabilities

The CFM module accepts input for up to two channels (mode dependent). Each of the input channels can connect to:

 Magnetic Pickup - 50mV trigger  TTL output - 1.3V trigger  Preamp outputs - 4V trigger

You configure the CFM module’s two input channels for your specific application(s). Each input channel has two input selections:

 Flowmeter Input (F0 & F1) - Connect input device to this input.  Gate Input (Z0 & Z1) - Accepts 4-40V DC input pulses from open

collectors or external contact closures. These inputs are used in Totalizer mode to:

– interface to a prover when a prover is enabled.

The CFM module has two assignable outputs. These outputs are designed for applications that require fast response. The outputs:

 are electrically fused/current limited to 4A; the total output

combination is limited to 7A.

 can be assigned to any input channel with user-defined trigger parameter

(see Table 1

 are current sourcing at 10-31.2V DC (1A maximum per output).  must be connected to an external power supply.  may be forced ON or OFF by the program.

You can assign both outputs to a given channel; however, you cannot use the same output with two different channels.

Table 1 - Assign the CFM Module’s Outputs

In this operational mode You can assign outputs that are

configured to trigger

Totalizer Frequency (acceleration)

Prover status Fill control

High-Resolution Frequency Frequency

Frequency rate of change (acceleration)

15Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

16 What is the Configurable Flowmeter Module?

IMPORTANT

Using Module Identification and Status Information

Each ControlLogix CFM module maintains specific identification information that separates it from all other modules. This information assists you in tracking all the components of your system.

For example, you can track module identification information to be aware of exactly what modules are located in any ControlLogix rack at any time. While retrieving module identity, you can also retrieve the module’s status.

Each module maintains the following information:

Table 2 - Module Identification and Status Information

Module Identification Description

Product Type Module’s product type, such as Digital I/O or

Analog I/O module

Catalog Code Module’s catalog number

Major Revision Module’s major revision number

Minor Revision Module’s minor revision number

Status Module’s status. Returns the following information:

 Controller ownership (if any)  Whether module has been configured  Device Specific Status, such as:

 Self-Test  Flash update in progress  Communications fault  Not owned (outputs in program mode)  Internal fault (need flash update)  Run mode  Program mode (output mods only)

 Minor recoverable fault  Minor unrecoverable fault  Major recoverable fault  Major unrecoverable fault

Vendor ID Module manufacturer vendor, for example Allen-Bradley

Serial Number Module serial number

Length of ASCII Text String Number of characters in module’s text string

ASCII Text String Number of characters in module’s text string

You must perform a WHO service to retrieve this information.

16Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Chapter

Configurable Flowmeter Operation in the ControlLogix System

What This Chapter Contains

This chapter describes how the CFM module works within the ControlLogix system.

In traditional industrial applications, controllers poll Flowmeter modules to obtain their status. Controllers also send commands to the Flowmeter modules. Retrieving Flowmeter status and sending commands occurs during the normal I/O program scan.

ControlLogix CFM modules do not follow the traditional operational manner. Instead, they use the Producer/Consumer Model information) to produce data without having been polled by a controller first.

Topic Page

Ownership 19

Using RSNetWorx and RSLogix 5000 Software 19

Connections 21

Configurable Flowmeter Modules in a Local Chassis 23

Requested Packet Interval (RPI) 23

Configurable Flowmeter Modules in a Remote Chassis 24

Listen-Only Connections 22

(see page 33 for more

17Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

18 Configurable Flowmeter Operation in the ControlLogix System

IMPORTANT

42732

Input device

5 3

1756-CFMLogix controller

1756-CFM modules follow these basic operational steps, as shown in Figure 2.

1. The Logix controller establishes a connection to the CFM module and downloads configuration via ladder logic and message instructions.

2. Flowmeters transmit input signals to the CFM module.

3. The 1756-CFM module calculates volume from accumulated pulse

counts as engineering units.

4. Rather than being scanned by an owner-controller, the 1756-CFM module periodically multicasts its status to the controller. (see Requested

Packet Interval (RPI) on page 23.) The 1756-CFM module also

multicasts its status to controllers connected by a listen-only connection (page 22

5. The Logix owner-controller processes the data it received from the 1756-CFM module and returns the appropriate data.

Figure 2 - 1756-CFM Basic Operational Steps

A 1756-CFM module’s communication, or multicasting, behavior varies depending upon whether it operates in the local chassis or in a remote chassis. The following sections detail the differences in data transfers between these set-ups.

18Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Operation in the ControlLogix System 19

IMPORTANT

Ownership

Using RSNetWorx and RSLogix 5000 Software

Every CFM module in the ControlLogix system must be owned by a Logix5550

Each CFM module continuously maintains communication with its owner during normal operation. When connections are severed or compromised, the CFM module performs as configured, either setting all outputs to reset (ON or OFF) or continuous operations.

Other controllers may also listen to the CFM module (while another controller owns the module) through a listen-only connection. For more information on listen-only connections, see page 22

The I/O configuration portion of RSLogix™ 5000 software generates configuration data structures and tags for that CFM module, whether the module is located in a local or remote chassis. A remote chassis, also known as networked, contains the CFM module but not the module’s owner-controller.

Controller. The owner-controller:

 stores configuration data for every CFM module that it owns.  can be local or remote in regard to the I/O module’s position.  sends configuration data to the CFM module to define the module’s

behavior within the control system.

After creating the CFM module, you can write specific configuration in the module’s data structures; you must access the module tags to change information in the data structures. This process is explained in detail in Chapter 5, Configuring the Configurable Flowmeter Module

Application-specific configuration data is transferred to the controller during the program download and sent to the CFM module during the initial power-up. After CFM module operation has begun, you must use ladder logic and message instructions to make configuration changes.

19Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

20 Configurable Flowmeter Operation in the ControlLogix System

IMPORTANT

CFM Modules in Local Chassis

CFM modules in the same chassis as the owner-controller are ready to run as soon as the configuration data has been downloaded.

CFM Modules in Remote Chassis

You must run RSNetWorx™ software to enable CFM modules in the networked chassis. Running RSNetWorx software transfers configuration data to networked modules and establishes a Network Update Time (NUT) for ControlNet. The NUT is compliant with the desired communications options specified for each module during configuration.

Follow these general guidelines when configuring CFM modules:

1. Configure all CFM modules for a given controller using RSLogix 5000 software and download that information to the controller.

2. If the CFM configuration data references a module in a remote chassis, run RSNetWorx software.

RSNetWorx software must be run whenever a new module is added to a networked chassis. When a module is permanently removed from a remote chassis, we recommend that RSNetWorx software be run to optimize the allocation of network bandwidth.

20Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Operation in the ControlLogix System 21

IMPORTANT

Connections

Logix controllers make connections to 1756-CFM modules to exchange data. The controller can make either of the following connections to a 1756-CFM module:

 Direct Connections

CFM module.

 Listen-Only Connections

connection to a CFM module simultaneously.

- Only one controller can make this connection to a

- Multiple controllers can make this

Direct Connections

A direct connection is a real-time data transfer link between the controller and the device that occupies the slot that the configuration data references. When module configuration data is downloaded to an owner-controller, the controller attempts to establish a direct connection to each of the modules referenced by the data. One of the following events occurs:

 If the data is appropriate to the module found in the slot, a connection

is made and operation begins.

 If the configuration data is not appropriate, the data is rejected and an

error message displays in the software. In this case, the configuration data can be inappropriate for any of a number of reasons. For example, a module’s configuration data may be appropriate except for a mismatch in electronic keying that prevents normal operation.

The controller maintains and monitors its connection with a module. Any break in the connection, such as removal of the module from the chassis while under power, causes the controller to set fault status bits in the data area associated with the module. The RSLogix 5000 software may monitor this data area to announce the modules’ failures.

The typical Logix controller can make and maintain up to 250 connections. Each 1756-CFM module requires 1 connection.

21Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

22 Configurable Flowmeter Operation in the ControlLogix System

IMPORTANT

Listen-Only Connections

Any controller in the system can listen to the data from any CFM module even if the controller does not own the module (in other words, it does not have to hold the module’s configuration data to listen to the module).

During the CFM module creation process in RSLogix 5000 software, you can specify the ‘Listen-Only’ Communication Format. For more information on Communication Format, see page 82

Choosing ‘Listen-Only’ mode allows the controller and module to establish communications without the controller sending any configuration data. In this instance, another controller owns the CFM module.

Controllers using the Listen-Only mode continue to receive data multicast from the CFM module as long as a connection between an owner and CFM module is maintained.

If the connection between all owners and the CFM module is broken, the module stops multicasting data and connections to all ‘Listening controllers’ are also broken.

22Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Operation in the ControlLogix System 23

IMPORTANT

On-Board Memory

Status Data

Flowmeter 0

Flowmeter 1

Ch 0

Ch 1

41361

Configurable Flowmeter Modules in a Local Chassis

CFM modules multicast their data periodically. Multicast frequency depends on the options chosen during configuration and where in the control system the module physically resides. The data consumer (an owner-controller) is responsible for knowing that the format of the new data is integers.

Requested Packet Interval (RPI)

This configurable parameter instructs the module to multicast its channel and status data to the local chassis backplane at specific time intervals.

The RPI instructs the module to multicast the current contents of its on-board memory when the RPI expires, (i.e. the module does not update its channels prior to the multicast) as shown in this figure.

You set the RPI value during the initial module configuration and can adjust it the controller is in Program mode.

The minimum RPI is determined by channel usage. For each channel using High Resolution Frequency mode, add 5 ms to the minimum RPI. For each channel using Totalizer Mode, add 50 ms to the minimum RPI.

For example, if one channel uses High Resolution Frequency mode and the other goes unused, the minimum RPI = 5 ms. If one channel uses High Resolution Frequency mode and the other uses Totalizer mode, the minimum RPI = 55 ms.

23Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

24 Configurable Flowmeter Operation in the ControlLogix System

ControlNet

CFM data at least as often as RPI

Data in remote chassis at the RPI rates

Owner controller ControlNet Bridge module ControlNet Bridge module

CFM module

40947

Configurable Flowmeter Modules in a Remote Chassis

If an CFM module resides in a networked chassis, the role of the RPI changes slightly with respect to getting data to the owner.

The RPI not only defines when the module multicasts data within its own chassis (as described in the previous section), but also determines how often the owner-controller will receive it over the network.

When an RPI value is specified for an CFM module in a remote chassis, in addition to instructing the module to multicast data within its own chassis, the RPI also “reserves” a spot in the stream of data flowing across the ControlNet network.

The timing of this “reserved” spot may or may not coincide with the exact value of the RPI, but the control system guarantees that the owner controller receives data at least as often as the specified RPI.

See Figure 2

for a better understanding of the data flow with a CFM module in

a remote chassis.

Figure 2 - CFM Module in Remote Chassis with RPI Reserving a Spot in Flow of Data

24Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Chapter

Configurable Flowmeter Module Features and Operational Modes

What this Chapter Contains

This chapter describes the ControlLogix Configurable Flowmeter module’s features and operational modes.

Topic Page

Understanding General Module Features 25

Electronic Keying 27

Choosing an Operational Mode 35

Operating in High Resolution Frequency Mode 36

Operating in Totalizer Mode 41

Using the Totalizer Mode Prover Function 42

Using the Totalizer Mode Filler Function 50

Configurable Output Behaviors 58

This chapter only provides a general description of each feature, whether general or operational mode-specific. For examples of how to use these features in your module’s configuration, see Configuring the Configurable

Flowmeter Module 5 on page 77.

Understanding General Module Features

25Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

The following general module features are available with the ControlLogix CFM module.

Module Feature Page

Removal and Insertion Under Power (RIUP) 26

Module Fault Reporting 26

Fully Software Configurable 26

Producer/Consumer Model 33

Module Status Information 34

Configurable Flowmetering Channels 34

Flowmeter Inputs 34

Gate Inputs 34

User-Defined Preset and Rollover Values 35

Current-Sourcing Outputs 35

26 Configurable Flowmeter Module Features and Operational Modes

Removal and Insertion Under Power (RIUP)

All ControlLogix CFM modules may be inserted and removed from the chassis while power is applied. This feature allows greater availability of the overall control system because, while the module is being removed or inserted, there is no additional disruption to the rest of the controlled process.

Module Fault Reporting

ControlLogix CFM modules provide both hardware and software indication when a module fault has occurred. Each module’s LED fault indicator and RSLogix 5000 software will graphically display this fault and include a fault message describing the nature of the fault.

This feature allows you to determine how your module has been affected and what action should be taken to resume normal operation.

Fully Software Configurable

The RSLogix 5000 software uses a custom, easily understood interface to write configuration. All module features are enabled or disabled through the I/O configuration portion of the software.

You can also use the software to interrogate any module in the system to retrieve:

 serial number  revision information  catalog number  vendor identification  error/fault information  diagnostic counters.

By eliminating such tasks as setting hardware switches and jumpers, the software makes module configuration easier and more reliable.

26Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 27

Electronic Keying

The electronic keying feature automatically compares the expected module, as shown in the RSLogix 5000 I/O Configuration tree, to the physical module before I/O communication begins. You can use electronic keying to help prevent communication to a module that does not match the type and revision expected.

For each module in the I/O Configuration tree, the user-selected keying option determines if, and how, an electronic keying check is performed. Typically, three keying options are available:

 Exact Match  Compatible Keying  Disable Keying

You must carefully consider the benefits and implications of each keying option when selecting between them. For some specific module types, fewer options are available.

Electronic keying is based on a set of attributes unique to each product

™

revision. When a Logix5000

controller begins communicating with a

module, this set of keying attributes is considered.

Table 3 - Keying Attributes

Attribute Description

Vendor The manufacturer of the module, for example, Rockwell

Automation/Allen-Bradley.

Product Type The general type of the module, for example, communication

adapter, AC drive, or digital I/O.

Product Code The specific type of module, generally represented by its catalog

number, for example, 1756-IB16I.

Major Revision A number that represents the functional capabilities and data

exchange formats of the module. Typically, although not always, a later, that is higher, Major Revision supports at least all of the data formats supported by an earlier, that is lower, Major Revision of the same catalog number and, possibly, additional ones.

Minor Revision A number that indicates the module’s specific firmware revision.

Minor Revisions typically do not impact data compatibility but may indicate performance or behavior improvement.

You can find revision information on the General tab of a module’s Properties dialog box.

27Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

28 Configurable Flowmeter Module Features and Operational Modes

IMPORTANT

Figure 3 - General Tab

Exact Match

Exact Match keying requires all keying attributes, that is, Vendor, Product Type, Product Code (catalog number), Major Revision, and Minor Revision, of the physical module and the module created in the software to match precisely to establish communication. If any attribute does not match precisely, I/O communication is not permitted with the module or with modules connected through it, as in the case of a communication module.

Changing electronic keying selections online may cause the I/O communication connection to the module to be disrupted and may result in a loss of data.

Use Exact Match keying when you need the system to verify that the module revisions in use are exactly as specified in the project, such as for use in highly-regulated industries. Exact Match keying is also necessary to enable Automatic Firmware Update for the module via the Firmware Supervisor feature from a Logix5000 controller.

28Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 29

EXAMPLE

IMPORTANT

Module Configuration Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 1

Physical Module

Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 2

Communication is prevented.

In this scenario, Exact Match keying prevents I/O communication.

The module configuration is for a 1756-IB16D module with module revision 3.1. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is prevented because the Minor Revision of the module does not match precisely.

Changing electronic keying selections online may cause the I/O Communication connection to the module to be disrupted and may result in a loss of data.

Compatible Keying

Compatible Keying indicates that the module determines whether to accept or reject communication. Different module families, communication adapters, and module types implement the compatibility check differently based on the family capabilities and on prior knowledge of compatible products. Release notes for individual modules indicate the specific compatibility details.

Compatible Keying is the default setting. Compatible Keying allows the physical module to accept the key of the module configured in the software, provided that the configured module is one the physical module is capable of emulating. The exact level of emulation required is product and revision specific.

29Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

30 Configurable Flowmeter Module Features and Operational Modes

EXAMPLE

Module Configuration Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Minor Revision = 3

Physical Module Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D Major Revision = 3

Communication is prevented.

With Compatible Keying, you can replace a module of a certain Major Revision with one of the same catalog number and the same or later, that is higher, Major Revision. In some cases, the selection makes it possible to use a replacement that is a different catalog number than the original. For example, you can replace a 1756-CNBR module with a 1756-CN2R module.

When a module is created, the module developers consider the module’s development history to implement capabilities that emulate those of the previous module. However, the developers cannot know future developments. Because of this, when a system is configured, we recommend that you configure your module using the earliest, that is, lowest, revision of the physical module that you believe will be used in the system. By doing this, you can avoid the case of a physical module rejecting the keying request because it is an earlier revision than the one configured in the software.

In this scenario, Compatible Keying prevents I/O communication:

The module configuration is for a 1756-IB16D module with module revision 3.3. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is prevented because the minor revision of the module is lower than expected and may not be compatible with 3.3.

30Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 31

EXAMPLE

IMPORTANT

Module Configuration Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D

Major Revision = 2 Minor Revision = 1

Physical Module Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16D

Major Revision = 3 Minor Revision = 2

Communication is allowed.

In this scenario, Compatible Keying allows I/O communication:

The module configuration is for a 1756-IB16D module with module revision 2.1. The physical module is a 1756-IB16D module with module revision 3.2. In this case, communication is allowed because the major revision of the physical module is higher than expected and the module determines that it is compatible with the prior major revision.

Changing electronic keying selections online may cause the I/O communication connection to the module to be disrupted and may result in a loss of data.

31Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

32 Configurable Flowmeter Module Features and Operational Modes

ATTENTION

EXAMPLE

Module Configuration Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IA16 Major Revision = 3 Minor Revision = 1

Physical Module Vendor = Allen-Bradley Product Type = Analog Input Module Catalog Number = 1756-IF16 Major Revision = 3 Minor Revision = 2

Communication is prevented.

Disabled Keying

Disabled Keying indicates the keying attributes are not considered when attempting to communicate with a module. Other attributes, such as data size and format, are considered and must be acceptable before I/O communication is established. With Disabled Keying, I/O communication may occur with a module other than the type specified in the I/O Configuration tree with unpredictable results. We generally do not recommend using Disabled Keying.

If you use Disabled Keying, you must take full responsibility for understanding whether the module being used can fulfill the functional requirements of the application.

Be extremely cautious when using Disabled Keying; if used incorrectly, this option can lead to personal injury or death, property damage, or economic loss.

In this scenario, Disable Keying prevents I/O communication:

The module configuration is for a 1756-IA16 digital input module. The physical module is a 1756-IF16 analog input module. In this case, communication is prevented because the analog module rejects the data formats that the digital module configuration requests.

32Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 33

EXAMPLE

IMPORTANT

Module Configuration Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IA16 Major Revision = 2 Minor Revision = 1

Physical Module Vendor = Allen-Bradley Product Type = Digital Input Module Catalog Number = 1756-IB16 Major Revision = 3 Minor Revision = 2

Communication is allowed.

In this scenario, Disable Keying allows I/O communication:

The module configuration is for a 1756-IA16 digital input module. The physical module is a 1756-IB16 digital input module. In this case, communication is allowed because the two digital modules share common data formats.

Changing electronic keying selections online may cause the I/O communication connection to the module to be disrupted and may result in a loss of data.

Producer/Consumer Model

By using the Producer/Consumer model, ControlLogix CFM modules can produce data without having been polled by a controller first. The modules produce the data and any other owner controller device can decide to consume it.

33Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

34 Configurable Flowmeter Module Features and Operational Modes

IMPORTANT

Module Status Information

The ControlLogix CFM module has status indicators on the front of the module that allow you to check the module health and operational status.

The following status can be checked with the LED indicators:

 Input point status - display indicates a particular points status,

including specific indicators for the input F and Z points for each channel

 Output point status - display indicates the status of two output points

on the module

For an example of the status indicators, see page 115

Configurable Flowmetering Channels

The CFM module offers two configurable Flowmetering channels. Each channel uses two Flowmeter inputs (F0 & F1) and two corresponding gate inputs (Z0 & Z1).

Flowmeter Inputs

Two Flowmeter inputs (F0 & F1) are available on your CFM module. The inputs are capable of receiving the following input signals:

 +/- 30V peak from passive Magnetic Pickups  5V DC logic (TTL compatible)  12-24V DC powered preamp outputs

Gate Inputs

The CFM module offers two gate inputs (Z0 & Z1). You can wire the inputs for single-ended or differential applications and can accept signals at 5V DC or 12-24V DC.

The Z0 and Z1 inputs can have different voltages connected to them simultaneously.

34Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 35

User-Defined Preset and Rollover Values

The CFM module has a maximum count of 2,147,483,647, but you can define the rollover values below this limit.

Current-Sourcing Outputs

Two current-sourcing outputs are available on the CFM module. Each output:

 can be tied to any Flowmeter input.  operates in the 10-31.2V DC range (1A maximum per output).  operates at 5V DC level (3-20mA maximum per output).

Choosing an Operational Mode

The CFM module counts pulses from Flowmeters and operates in the following modes:

 High Resolution Frequency Mode  Totalizer Mode

You must choose an operational mode for your 1756-CFM module in the RSLogix 5000 software.

35Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

36 Configurable Flowmeter Module Features and Operational Modes

42731

Pulse output

Fuel

Monitors fuel flow and total gallons

Generator

Electricity

Shaft encoder

Tur bi ne

Shaft speed

1756-CFM

Logix controller:

 monitors shaft speed  performs PID calculations  adjusts valve by a 1756-OF6VI

analog output module.

1756-OF6VI

Fin (250 x 10-9)

sample

Resolution =

Where:

 F

is the input frequency

 T

sample

is the sample time period

Operating in High Resolution Frequency Mode

In High Resolution Frequency mode, the CFM module calculates frequency over a user-defined time period up to 2 seconds. Frequency sampling begins on the leading edge of the first pulse and ends on the next pulse to occur after the sampling period expires.

This figure shows a CFM module in a turbine shaft speed monitoring application in high resolution frequency mode.

You must calculate a resolution for this mode. Use the following equation to calculate resolution.

This table lists sample F

Table 4 - Sample Resolutions

60Hz 0.033 seconds 0.00045Hz

5000Hz 0.020 seconds 0.0625Hz

50,000Hz 0.050 seconds 0.25Hz

The values listed in Table 4 change according to your application.

36Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

and T

sample

values and the corresponding resolution.

sample

are listed for example purposes. Specific values will

Resolution

Configurable Flowmeter Module Features and Operational Modes 37

Terminal Usage in High Resolution Frequency Mode

In Frequency mode, F0 and F1 are used as inputs.

Output Operation in Frequency Mode

In Frequency mode, outputs can:

 operate normally  be forced ON or OFF.  be tied to the frequency flowmeter input (i.e. F1).

37Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

38 Configurable Flowmeter Module Features and Operational Modes

Module Features Used in High Resolution Frequency Mode

The following module features are available in High Resolution Frequency mode.

Module Feature Page

Low Frequency Clear 38

Sample Time 38

Acceleration Calculation 39

Meter Factor 39

Trigger On 39

Tie to Counter 39

Highest Allowed Frequency 40

Acceleration Alarm Value 40

Frequency Average 40

Acceleration 40

Low Frequency Clear

Use Low Frequency Clear to set a minimum frequency level. Any frequencies detected below this level will be set 0.

Sample Time

Use Sample Time to determine the length of time each sample uses. The maximum sample time is 2 seconds.

38Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 39

IMPORTANT

Acceleration Calculation

Acceleration Calculation is derived by using the rate of change of frequency over a specified number of samples (1 to 255). This moving average produces quick responses when the number of samples = 1 and stable, but slower, responses when the number of samples =255.

The default number of samples used = 255, but a typical application uses 50 samples. There are significant differences between response times. For example, the quick response offer acceleration calculations more often but is more likely to set off the Acceleration Alarm for calculation spikes at low frequencies. The stable responses are slower but ignore acceleration spikes in favor of definitive operational trends.

Acceleration Calculation values can be entered on the bit level or byte level. If you are entering values at the byte level, you must use -1 to represent 255. If you are entering values on the bit level, you can use the actual number value.

Meter Factor

Meter Factor is used to calibrate the frequency (Hz) to a user-defined standard. For example, the CFM module may read 59.9Hz while the standard is set for

59.7Hz. In this case, the meter factor (default = 1.0) should be changed to

0.99666 to correct the reading.

Trigger On

Use Trigger On to determine what state triggers an output to energize in high resolution frequency mode (i.e. an output can be configured to turn ON if the Frequency Average reaches a particular frequency.

 Frequency - Input exceeds MaxAllowedFreq.  Acceleration - Input speed accelerates beyond AccelAlarmValue.

For the Trigger On feature, Frequency and Acceleration are tied to the Overspeed Alarm and Acceleration Alarm respectively. The alarms remain latched ON once set and can only be reset if you toggle the Alarm Enable bits.

Tie to Counter

Choose which output is connected to which flowmeter input.

39Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

40 Configurable Flowmeter Module Features and Operational Modes

Highest Allowed Frequency

Use Highest Allowed Frequency to set the trigger point for Frequency. In other words, set this value so that when the input reaches it, the outputs are energized. This value is also used for the Overspeed Alarm.

Acceleration Alarm Value

Use Acceleration Alarm to set the trigger point for Acceleration. In other words, set this value so that when the input reaches it, the outputs are energized. This value is also used for the Acceleration Alarm.

Frequency Average

With Frequency Average, the CFM divides meter counts by a user-defined sample interval (up to 2 seconds) to determine the Frequency Average.

Acceleration

Use Acceleration to determine an acceleration value over a user-defined number of samples.

Alarms in High Resolution Frequency Mode

High Resolution Frequency mode offers the following alarms:

 Overrange Alarm  Overspeed Alarm  Acceleration Alarm

You must enable each alarm. When any of the alarms occur, it is latched and remains on until the user resets the alarm.

Sample Configuration for High Resolution Frequency Mode

To see a sample configuration for a 1756-CFM module using high resolution frequency mode, including the use of all the features mentioned in the previous section, see page 97

40Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 41

IMPORTANT

Operating in Totalizer Mode

In Totalizer mode, the 1756-CFM module counts pulses and scales them to engineering units. Every effort is made to store the least significant count even when the least significant unit of the total is larger. The CFM module calculates three forms of calculated frequency:

 Frequency over a fixed period  Frequency over a requested number of samples  Moving average of the frequency

All of the forms mentioned above are available in totalizer mode. In this mode, the module also offers the following functions:

 Prover Function  Filler Function

These functions are described later in this chapter.

Nonresettable Totalizer

Configure the CFM module for Nonresettable Totalizer mode to make sure the total counts value is not reset during normal module operation. The CFM

module stores total count values up to 2

-1 (2,147,483,647) counts.

The total count value can be reset in Nonresettable Totalizer mode if power is cycled to the module for any reason (e.g. module is removed from and reinserted to the chassis).

Terminal Usage in Totalizer Mode

In Totalizer mode, F0 and F1 are used as inputs. Z0 and Z1 are used as prover signals.

Output Operation in Totalizer Mode

In Totalizer mode, outputs:

 can operate normally or be forced ON or OFF.  can be tied to either flowmeter input. If one channel is configured for

trickle operation, both outputs are tied to that flowmeter input.

41Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

42 Configurable Flowmeter Module Features and Operational Modes

42731

1756-CFM

Logix controller:

 performs AGA/API calculations  controls prover  calculates/compensates based

on actual temperature

1756-IF6I

monitor fuel flow and total gallons

Remote

Termination

Panel

prover

Using the Totalizer Mode Prover Function

In the Totalizer Mode Prover function, the CFM module interfaces to a prover and counts pulses using a Flowmeter or positive displacement meter. The module then scales pulse count to engineering units. The CFM module can also use this mode to calculate frequency over a user-defined time period, where frequency is calculated as counts per unit time.

Either module output can be tied to either flowmeter input with the Prover function, and output operation can occur independently from new data from the Logix owner-controller.

With the Prover function, the totalizer is active all the time, but the Prover function must first be enabled and started to activate the Prover Total. Once the Prover function is started, only the gate signal or a user-override (i.e. clearing the Prover Enable bit) can eliminate the function. However, the Gross Volume, Net Volume, and Fill Total will continue to accumulate as long as the flow input frequency is enabled and is greater than Low Frequency Clear.

This figure shows a 1756-CFM module in a petrochemical flow and custody transfer application while operating in the totalizer mode prover function.

42Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 43

19884

detectors

spheroid

Using a Prover

A prover is used for the calibration of liquid meters in custody transfer applications. This calibration is done by comparing a metered throughput to a known volume in the prover. When enabled, the prover total updates while the spheroid moves between two detectors and is then compared to the predetermined volume of the prover section to ascertain the meter factor.

If you are using the Totalizer or Nonresettable Totalizer mode for capturing meter counts during a prover calibration, you have the option of selecting either of these types of provers:

 Unidirectional - With a unidirectional prover, the CFM module:

– begins updating Prover Total when the spheroid passes the first

detector

– stops updating Prover Total when the spheroid passes the second

detector

 Bidirectional - With a bidirectional prover, the CFM module:

– begins updating Prover Total when the spheroid passes the first

detector

– stops counting when the spheroid passes the second detector (Prover

Total is updated at this time - intermediate value returned)

– continues updating when the spheroid returns past the second

detector

– stops updating when the spheroid returns past the first detector

(Prover Total Count Value is updated at this time)

This figure shows an example of a spheroid and detectors.

43Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

44 Configurable Flowmeter Module Features and Operational Modes

Features Available with the Prover Function

The following module features are available with the Totalizer Mode Prover function.

Module Feature Page

Prover Direction 44

Low Frequency Clear 44

Trigger On 45

Tie to Counter 45

Total Overflow 45

Total Overrange 45

Total Overspeed 46

Total Acceleration 46

Prover Total 46

Total Counts 46

Frequency Average 46

Frequency Period 47

Speed 47

Acceleration 47

Gross Volume 47

Net Volume 47

Gross Rate 48

Net Rate 49

Prover Direction

You can operate the CFM module as a unidirectional or bidirectional prover. Use Prover Direction to configure the CFM module for the prover type used in your application.

Low Frequency Clear

Use Low Frequency Clear to set a minimum frequency level. Any counts detected below this level will not be used in count calculations.

44Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 45

Trigger On

Use Trigger On to determine what flowmeter state triggers the output to energize. For example, you can configure the CFM module to trigger an output when the flowmeter reaches a particular frequency (count).

The following events may trigger output 0 when using the flowmeter function:

 Frequency - flowmeter exceeds a certain frequency (count)  Acceleration - flowmeter accelerates beyond a particular rate  Prover Run State - flowmeter is operating in the run state  Prover Range State - flowmeter is enabled and not complete  Full Flow - flowmeter is in full flow mode  Trickle Flow - flowmeter is in trickle flow mode

Tie to Counter

Choose which output is connected to which flowmeter input.

Total Overflow

Use Total Overflow to monitor when the total counts has exceeded the rollover value. The rollover value is a user-defined value set during configuration. Three events must occur for you to use this feature:

 Overflow is enabled  You set a rollover value  The count total exceeds the rollover value

When the rollover value is exceeded, the Total Overflow bit is toggled to indicate the event and the Overflow Alarm is set.

Total Overrange

Use Total Overrange to monitor when a flowmeter exceeds the maximum frequency (100kHz). The maximum frequency period is calculated by the number of pulses being counted by the CFM per second. When the frequency period exceeds 100kHz, and the Overrange Alarm is enabled, the Overrange Alarm is set.

45Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

46 Configurable Flowmeter Module Features and Operational Modes

Total Overspeed

Use Total Overspeed to monitor when a flowmeter exceeds the Highest Allowed Frequency. With this feature, the CFM module calculates speed by the number of pulses counted in a user-defined sampling period. When the speed exceeds Highest Allowed Frequency, and the Overspeed Alarm is enabled, the Overspeed Alarm is set.

Total Acceleration

Use Total Acceleration to monitor when a flowmeter exceeds the maximum acceleration rate. The acceleration rate is calculated by using a three-point difference formula with unevenly spaced points. The acceleration calculation indicates the number of samples used in the calculation.

Prover Total

Use Prover Total to monitor the raw counts received during the Prover portion of the cycle. The Prover Total represents a net total count value obtained by applying a K-factor and CCF or AGA 7 compensation to the raw count.

Total Counts

Use Total Counts to monitor the total number of counts the CFM module has received since it was last reset to zero.

Frequency Average

Use Frequency Average when Frequency Period must be averaged over multiple samples (meter samples). You must configure the CFM module with a user-defined number of Meter Samples to use this feature. This uses the total counts over the total time per a user-defined number of meter samples. (A meter sample is approximately 20.0 ms.)

46Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 47

Frequency Period

Use Frequency Period to determine the frequency over a user-defined sample time.

Speed

To use the Speed feature, you must set a resolution. The module uses the resolution to determine the number of counts used in the Speed calculation.

For example, if you set the resolution at 0.00001, the module requires 100,000 counts. In this case, the module examines the previous samples stored in its buffers until 100,000 counts are found. The counts are divided by the time it took to accumulate them and the resulting value is the module speed.

Acceleration

Use Acceleration to determine an acceleration value over a user-defined number of samples.

Gross Volume

Use Gross Volume to convert total counts to volumetric units. The module employs a user-defined K-factor in the conversion. For example, you can configure the CFM module so that 4 counts = 1 pint. The module can then convert the total number of counts received to a total number of pints.

Net Volume

The Net Volume value represents the Gross Volume value with a AGA 7 or Logix compensation applied. This value is calculated at an application’s base (i.e. standard) operating conditions.

47Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

48 Configurable Flowmeter Module Features and Operational Modes

Gross Rate =

Total Counts in Meter Sample

K-factor

x Meter Factor

K-factor = (fin - 100.0) x

(71.0 - 25.0)

(200.0 - 100.0)

x 25.0

K-factor = (fin - 200.0) x

(111.0 - 71.0)

(300.0 - 200.0)

x 71.0

Gross Rate

Use Gross Rate to convert total counts to rate units. The module employs a user-defined K-factor in the conversion. The K-factor is a divisor, and the time interval is divided by this number, as shown below.

 If the input frequency is below 100Hz, the K-factor used is always 10.0

for frequencies interpolated between 0-100Hz.

 If the input frequency is between 100Hz and 200Hz, the K-factor is

interpolated as follows:

 If the input frequency is between 200Hz and 300Hz, the K-factor is

interpolated as follows:

 If the input frequency is greater than 300Hz, the K-factor used

is always 100.0. There is no K-factor calculation over 300Hz.

To use Gross Rate, you must set the K-factor values in Module Tags, as shown below.

Name Style Data type Value Change during

operation

C.Operations[0].kFactStruct.kFactorForChan[0] Float REAL

C.Operations[0].kFactStruct.kFactorForChan[1] Float REAL

C.Operations[0].kFactStruct.kFactorForChan[2] Float REAL 71.0 Yes

C.Operations[0].kFactStruct.kFactorForChan[3] Float REAL 111.0 Yes

C.Operations[0].kFactStruct.kFactorForChan[4]-

Float REAL 0 Yes

C.Operations[0].kFactStruct.kFactorForChan[12]

C.Operations[0].kFactStruct.FreqAtKFactor[0] Float REAL 0.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[1] Float REAL 100.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[2] Float REAL 200.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[3] Float REAL 300.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[4]-

Float REAL 0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[12]

(1)

To avoid discontinuity when interpolating Gross Rate, make sure the values in C.Operations[0].kFactStruct.kFactorForChan[0] and C.Operations[0].kFactStruct.kFactorForChan[1] match.

25.0

(1)

Yes

48Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 49

IMPORTANT

For more information on setting values in the Module Tags, see Configuring the Configurable Flowmeter Module

5 on page 77.

Net Rate

Use Net Rate in a fashion similar to Gross Rate. The key difference between Gross Rate and Net Rate is that Net Volume also uses a user-defined compensation factor (i.e. AGA 7 or Logix compensation) to convert net counts to net rate units.

Prover Status

Prover Status notifies you of the following prover states:

 Prover not active  Prover waiting for 1st start  Prover waiting for 1st stop  Prover waiting for 2nd start  Prover waiting for 2nd stop  Prover complete

Alarms with the Prover Function

The CFM module offers the following alarms when operating with the Prover function:

 Overflow Alarm  Overrange Alarm  Overspeed Alarm  Acceleration Alarm

You must enable each alarm. When any of the alarms occur, it is latched and remains on until you reset the alarm. (Toggle the alarm enable bit to reset the alarm.)

Sample Configuration for Totalizer Mode Prover Function

To see a sample configuration for a 1756-CFM module using totalizer mode prover function, including the use of all the features mentioned in the previous section, see page 101

49Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

50 Configurable Flowmeter Module Features and Operational Modes

42862

1756-CFM 1756-OF6CI

monitor liquid flow and total gallons

pulse output

fermentation tank

Logix controller

Using the Totalizer Mode Filler Function

The Totalizer Mode Filler function performs the basic operations of a fill application, including the following basic steps:

 Set a target fill volume  Start filling  Stop filling when the target volume is reached

Within the basic operations mentioned above, the Filler function provides multiple features that can be configured to adjust the fill application for specific circumstances. Those features are described later in this chapter.

The filler function requires a ladder program transition to start the fill cycle. Similar to the Prover function, the totalizer is active all the time, but the Filler function must be first enabled, and started to activate the Fill Total.

This figure shows a 1756-CFM module in a brewery flow monitoring application while operating in the totalizer mode filler function. The application shown requires additional ladder logic.

50Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 51

Trickle Function for Totalizer Mode

The trickle function is used with the filler function to improve volume repeatability in a filling application. The trickle function requires two filling lines and an optional discrete module to activate the trickle valve. Activation of the valve should be sized for worst case volume at least 100 ms based on typical program scan = 5 ms and an output module RPI = 25 ms.

For most of the filling process, the full flow state is assigned to one of the module’s outputs. For more repeatable fills or to prevent overfills, the pretrigger feature helps make sure that the full flow valve turns off before it reaches the Fill Transition

or Fill Total Target volume.

When the filling application reaches the user-defined Fill Transition

point, the trickle totalizer mode changes the application from the full flow line to the trickle flow line. This slower line allows the application to finish the filling process without any waste.

For more information on the Fill Transition

feature, see page 57.

The filler function can be used in any of the following conditions:

 Starting with the trickle flow  Filling with the full flow only  Restarting the timed trickle flow  Starting the trickle flow prior to the fill transition  Restarting full flow while in trickle flow

Using the Trickle feature in previously mentioned conditions requires specific configuration changes.

51Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

52 Configurable Flowmeter Module Features and Operational Modes

Configurable Features Available with the Totalizer Mode Filler Function

The following configurable features are available with the Totalizer Mode Filler function:

Module Features Page

Low Frequency Clear 52

PreTrigger 53

Fill Mode 53

Trigger On 53

Tie to Counter 53

Fill Enable 53

Fill Start 54

Fill Hold 54

Fill State 54

Fill Total 55

Total Counts 55

Gross Volume 55

Net Volume 55

Net Rate 57

Fill Total Target 57

Fill Transition 57

Fill Transition Timer 57

Low Frequency Clear

Use Low Frequency Clear to set a minimum frequency level. Any frequencies detected below this level will not be used in count calculations.

Low Frequency Clear uses two tags to configure channel 0.

 Local:X.C.Ch0LowFreqClear  Local:X.C.Operations[0].MinDetectableFreq

52Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 53

PreTrigger

PreTrigger works only on the Full Flow state. PreTrigger turns OFF the Full Flow state when it determines that the Fill Transition or Fill Total Target will be met before the next update. You must assign a channel to the local module output for this feature to provide repeatable operation.

Fill Mode

Use Fill Mode to choose volume or time for Trickle mode operation.

Trigger On

Use Trigger On to determine what state triggers output 0 to energize. For example, you can configure the CFM module to trigger an output when the prover reaches a particular frequency.

The following events may trigger an output in Filler mode:

 Frequency - Input exceeds a certain frequency (latched).  Acceleration - Input accelerates at a particular rate (latched).  Full Flow State - Module is operating in the full flow state.  Trickle Flow State - Module is operating in trickle state.

Tie to Counter

Choose which output is connected to which channel’s totalizer. There are two outputs on each module.

Fill Enable

Use Fill Enable to reset the Fill Total value. This feature does not reset the Gross Volume or Net Volume. You must use the reset for the Totalizer to reset those values.

53Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

54 Configurable Flowmeter Module Features and Operational Modes

TIP

Fill Start

Fill Start starts the Fill upon transition from 0 to 1. Reset the Fill Enable to reset this feature. If any outputs are connected to the channel, they will transition back to reset and close the valve.

Fill Hold

Use the Fill Hold feature to shutdown the:

 full flow valve

 trickle flow valve.

Setting the Fill Hold feature changes the Fill State to 0 and causes the Fill function to continue even when the Fill Start has been reset.

Fill State

Use Fill State to monitor the current state of the CFM module. The following fill states are possible:

 Filler not active or In Hold  Filler Enabled only, waiting for start  Timed Trickle Flow complete, not filled  Full Flow Active (or Running)  Timed Trickle Flow Active  Full Flow Active  Trickle Flow Active  Fill complete (7 in module tags)

Use the Fill States to operate a trickle flow valve connected to an optional digital output module.

54Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 55

Net Volume =

Total Counts in Meter Sample

K-factor

x Meter Factor x CCF

Gross Rate =

Total Counts in Meter Sample

K-factor

x Meter Factor

Fill Total

Use Fill Total to determine the current total in an ongoing fill application. During the fill cycle, use Net Volume to check the Fill Total.

Total Counts

Use Total Counts for the accumulated raw counts the CFM module has received since its last reset. The total counts may be used for applications that employ a different methodology to calculate Gross and Net Volumes.

Gross Volume

Net Volume

Use Net Volume to apply a user-defined compensation factor (i.e. AGA 7 or Logix compensation) to the Gross Volume. This feature uses the following equation:

Gross Rate

 If the input frequency is below 100Hz, the K-factor used is always 10.0

for frequencies interpolated between 0-100Hz.

55Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

56 Configurable Flowmeter Module Features and Operational Modes

K-factor = (fin - 100.0) x

(71.0 - 25.0)

(200.0 - 100.0)

x 25.0

K-factor = (fin - 200.0) x

(111.0 - 71.0)

(300.0 - 200.0)

x 71.0

IMPORTANT

 If the input frequency is greater than 100Hz-200Hz, the K-factor is

interpolated as follows:

 If the input frequency is greater than 200Hz-300Hz, the K-factor is

interpolated as follows:

 If the input frequency is greater than 300Hz, the K-factor used

is always 100.0. There is no K-factor calculation over 100Hz.

To use Gross Rate, you must set the K-factor values in Module Tags, as shown below.

Name Style Data type Value Change during

operation

C.Operations[0].kFactStruct.kFactorForChan[0] Float REAL

C.Operations[0].kFactStruct.kFactorForChan[1] Float REAL

25.0

Yes

C.Operations[0].kFactStruct.kFactorForChan[2] Float REAL 71.0 Yes

C.Operations[0].kFactStruct.kFactorForChan[3] Float REAL 111.0 Yes

C.Operations[0].kFactStruct.kFactorForChan[4]-

Float REAL 0 Yes

C.Operations[0].kFactStruct.kFactorForChan[12]

C.Operations[0].kFactStruct.FreqAtKFactor[0] Float REAL 0.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[1] Float REAL 100.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[2] Float REAL 200.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[3] Float REAL 300.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[4]-

Float REAL 0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[12]

To avoid discontinuity when interpolating Gross Rate, make sure the values in C.Operations[0].kFactStruct.kFactorForChan[0] and C.Operations[0].kFactStruct.kFactorForChan[1] match.

For more information on setting values in the Module Tags, see Configuring the Configurable Flowmeter Module

5 on page 77.

56Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 57

Net Volume =

Total Counts in Meter Sample

K-factor x Sample Interval

x Meter Factor x CCF

Net Rate

Use Net Rate to convert Net Volume to a rate using the following equation:

Fill To ta l Tar get

Fill Total Target is the user-defined final volume (in engineering units) for a total fill.

Fill Transition

Fill Transition is the user-defined Net Volume value to switch from full flow to trickle flow.

Fill Transition Timer

After the transition from full flow to trickle flow, the Fill Transition Timer value determines how long the trickle will last (i.e. this feature sets the time that the trickle valve is open or ON).

Alarms with the Filler Function

The CFM module offers the following alarms when operating the Filler function:

 Overflow Alarm - TotalCounts > RollOver Value  Overrange Alarm - FreqPeriod > 100kHz  Overspeed Alarm - Speed > Highest Allowed Frequency  Acceleration Alarm - Acceleration > Acceleration Alarm Value

You must enable each alarm. When any of the alarms occur, it is latched and remains on until you reset the alarm. (Toggle the alarm enable bit to reset the alarm.)

57Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Sample Configuration for Totalizer Mode Filler Function

To see a sample configuration for a 1756-CFM module using totalizer mode filler function, including the use of all the features mentioned in the previous section, see page 108

58 Configurable Flowmeter Module Features and Operational Modes

FreqOff = 60 FreqOn = 20

Tim e

= On

Frequency

FreqOn = 60 FreqOff = 20

= On

Tim e

Frequency

Configurable Output Behaviors

Firmware revision 2.4 enables you to configure the 1756-CFM module outputs to turn on or off at specified frequency counts.

Three types of behaviors, listed in the Frequency Values and Resulting Behaviors table, can be configured with the use of firmware revision 2.4. Use this table as a reference when determining on/off frequency values later in the configuration procedure.

Table 5 - On/Off Frequency Behaviors

Frequency Value Behavior

FreqOn = 0.0 FreqOff = 0.0

FreqOff greater than FreqOn

Typical behavior when firmware revision 1.x is used. If the C.OutputSetup[X].TriggerOn value is 1, a frequency count corresponding to the TriggerOn frequency activates the Ch[X]Overspeed Alarm, which latches and requires additional programming to unlatch.

The specified channel turns off when the frequency count is at or above the specified FreqOff value. The specified channel turns on when the frequency count is at or above the FreqOn value. For example:

FreqOn greater than FreqOff

The specified channel turns on when the frequency count is at or above the specified FreqOn value. The specified channel turns off when the frequency count is at or below the specified FreqOff value. For example:

58Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 59

How To Enable Output Behavior Configuration

To enable output behavior configuration for a 1756-CFM module with firmware revision 2.4, select one of these options.

 If you are using RSLogix 5000 software version 16 or earlier, see

Appendix

 If you are using RSLogix 5000 software version 17 or later, add a new

module to your I/O Configuration folder and complete the following steps.

1. On the Select Module screen, select the 1756-CFM module and click OK.

The Select Major Revision window opens.

E on page 147.

2. Verify that Major Revision 2 is chosen and click OK.

The New Module dialog box opens with Major Revision 2 chosen.

Output Behavior configuration is enabled.

59Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

60 Configurable Flowmeter Module Features and Operational Modes

Notes:

60Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable

ATTENTION

Flowmeter Module

Chapter

What this Chapter Contains

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating.

This chapter describes how to install the ControlLogix Configurable Flowmeter module.

For information on See page

Power Requirements 63

Installing the Module 64

Keying the Removable Terminal Block/Interface Module 65

Wiring the Removable Terminal Block 66

Wiring the Module 69

Assembling the Removable Terminal Block and Housing 73

Installing the Removable Terminal Block on the Module 73

Removing the Removable Terminal Block from the Module 74

Removing the Module 76

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR 11. Without appropriate precautions, there may be difficulties with electromagnetic compatibility in residential and other environments due to conducted and radiated disturbances.

This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The enclosure must have suitable flame-retardant properties to prevent or minimize the spread of flame, complying with a flame spread rating of 5VA, V2, V1, V0 (or equivalent) if nonmetallic. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

In addition to this publication, see the following:

 Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1

installation requirements

 NEMA Standard 250 and IEC 60529, as applicable, for explanations of the degrees of protection

provided by enclosures

61Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

, for additional

62 Installing the Configurable Flowmeter Module

WARNING

AVERTISSEMENT

ATTENTION

North American Hazardous Location Approval

The following information applies when operating this equipment in hazardous locations.

Products marked "CL I, DIV 2, GP A, B, C, D" are suitable for use in Class I Division 2 Groups A, B, C, D, Hazardous Locations and nonhazardous locations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the most adverse temperature code (lowest "T" number) may be used to help determine the overall temperature code of the system. Combinations of equipment in your system are subject to investigation by the local Authority Having Jurisdiction at the time of installation.

EXPLOSION HAZARD -

 Do not disconnect equipment unless power

has been removed or the area is known to be nonhazardous.

 Do not disconnect connections to this

equipment unless power has been removed or the area is known to be nonhazardous. Secure any external connections that mate to this equipment by using screws, sliding latches, threaded connectors, or other means provided with this product.

 Substitution of components may impair

suitability for Class I, Division 2.

 If this product contains batteries, they

must only be changed in an area known to be nonhazardous.

Informations sur l’utilisation de cet equipement en environnements dangereux.

Les produits marques "CL I, DIV 2, GP A, B, C, D" ne conviennent qu'a une utilisation en environnements de Classe I Division 2 Groupes A, B, C, D dangereux et non dangereux. Chaque produit est livre avec des marquages sur sa plaque d'identification qui indiquent le code de temperature pour les environnements dangereux. Lorsque plusieurs produits sont combines dans un systeme, le code de temperature le plus defavorable (code de temperature le plus faible) peut etre utilise pour determiner le code de temperature global du systeme. Les combinaisons d'equipements dans le systeme sont sujettes a inspection par les autorites locales qualifiees au moment de l'installation.

RISQUE D’EXPLOSION –

 Couper le courant ou s'assurer que

l'environnement est classe non dangereux avant de debrancher l'equipement.

 Couper le courant ou s'assurer que

l'environnement est classe non dangereux avant de debrancher les connecteurs. Fixer tous les connecteurs externes relies a cet equipement a l'aide de vis, loquets coulissants, connecteurs filetes ou autres moyens fournis avec ce produit.

 La substitution de composants peut rendre cet

equipement inadapte a une utilisation en environnement de Classe I, Division 2.

 S'assurer que l'environnement est classe

non dangereux avant de changer les piles.

Prevent Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

 Touch a grounded object to discharge potential static.  Wear an approved grounding wriststrap.  Do not touch connectors or pins on component

boards.

 Do not touch circuit components inside the equipment.  Use a static-safe workstation, if available.  Store the equipment in appropriate static-safe

packaging when not in use.

62Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 63

ATTENTION

The ControlLogix system has been agency certified using only the ControlLogix RTBs (catalog numbers 1756-TBNH and 1756-TBSH). Any application that requires agency certification of the ControlLogix system using other wiring termination methods may require application specific approval by the certifying agency.

Power Requirements

This module receives power from the 1756 chassis power supply and requires 2 sources of power from the backplane:

 300mA at 5.1V DC  16mA at 24V DC

Add this current/power value (1.7W) to the requirements of all other modules in the chassis to prevent overloading the power supply.

63Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

64 Installing the Configurable Flowmeter Module

WARNING

Printed Circuit Board

20861–M

Installing the Module

You can install or remove the module while chassis power is applied.

When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding. Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance that can affect module operation.

When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

1. Align the circuit board with the top and bottoms chassis guides.

64Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 65

Locking tab

20862–M

U-shaped bands

20850–M

2. Slide the module into the chassis until the module locking tabs click.

Keying the Removable Terminal Block/Interface Module

Wedge-shaped keying tabs and U-shaped keying bands came with your RTB to prevent connecting the wrong wires to your module.

Key positions on the module that correspond to unkeyed positions on the RTB. For example, if you key the first position on the module, leave the first position on the RTB unkeyed.

Key the Module

1. Insert the U-shaped band as shown in this figure.

2. Push the band until it snaps in place.

65Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

66 Installing the Configurable Flowmeter Module

20851–M

Wedge-shaped tab

WARNING

Key the RTB/IFM

1. Insert the wedge-shaped tab with the rounded edge first, as shown in this figure.

2. Push the tab until it stops.

Reposition the tabs to rekey future module applications.

Wiring the Removable Terminal Block

Wire the RTB with a 8mm (5/16 in.) maximum flat-bladed screwdriver before installing it onto the module.

Shielded cable is required with this module. We recommend using Belden 8761 cable to wire the module. The RTB terminations can accommodate

10.33…2.1 mm² (22…14 AWG) shielded wire.

If you connect or disconnect wiring while the field-side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

66Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 67

IMPORTANT

A. Remove a length

of cable jacket from the connecting cable.

B. Pull the foil shield

and bare drain wire from the insulated wire.

C. Twist the foil shield

and drain wire together to form a single strand.

D. Attach a ground

lug and apply heat shrink tubing to the exit area.

E. Connect the drain wire to

a chassis mounting tab.

Use any chassis mounting tab that is designated as a functional signal ground.

Chassis mounting tab

Drain wire with ground lug

4M or 5M (#10 or #12) phillips screw and star washer (or SEM screw)

4M or 5M (#10 or #12) star washer

20104-M

20918-M

Connect Grounded End of the Cable

1. Ground the drain wire, as shown in this figure.

We recommend grounding the drain wire at the field-side. If you cannot ground at the field-side, ground at an earth ground on the chassis as shown.

2. Connect the insulated wires to the field-side.

Connect Ungrounded End of the Cable

1. Cut the foil shield and drain wire back to the cable casing and apply shrink wrap.

2. Connect the insulated wires to the RTB as shown in the next section.

67Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

68 Installing the Configurable Flowmeter Module

20863–M

Screwdriver

Wire

Connect Wires to the RTBs

There are two types of RTBs available for use with the 1756-CFM module:

 1756-TBSH Spring Clamp RTB  1756-TBNH NEMA Screw RTB

1756-TBSH Spring Clamp RTB

1. Strip 11mm (7/16 in.) maximum length of wire.

2. Insert the screwdriver into the inner hole of the RTB, as shown in this

figure.

3. Insert the wire into the open terminal and remove the screwdriver.

68Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 69

42516

1756-TBNH NEMA Screw RTB

1. Strip 8mm (5/16 in.) maximum length of wire.

2. Turn the terminal screw counterclockwise.

Figure 5.1

Wiring the Module

3. Wrap wire around the terminal.

4. Turn the terminal screw clockwise until it tightens on the wire.

You can only connect wiring to your module through an RTB or IFM. In this chapter, we show how to wire the 1756-CFM for three applications.

 Standard Flowmeter Wiring Example  Standard Prover/Detector Wiring Example  Standard Output Wiring Example

69Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

70 Installing the Configurable Flowmeter Module

Shield ground

Flowmeter Device

Z0 12-24V DC

Z0 5V DC

Z0 Return

Customer VCC

F0 Return

Not used

Output 0

Customer VCC

Z1 12-24V DC

Z1 5V DC

Z1 RET

Not used

Customer Common

Not used

Output 1

F1 Return

1. This wiring diagram can be used in applications with 50mV (magnetic pickup), 1.3V

(TTL) or 4V (preamp level) thresholds. You must use the RSLogix 5000 software to choose the appropriate threshold level for your specific application.

2. If separate power sources are used, do not exceed the specified isolation voltage.

NOTES:

42568

Customer Common

–

Standard Flowmeter Wiring Example

70Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 71

1. Detectors #1 and #2 must be wired in parallel.

2. Customer VCC may be used to power detectors. In this case, though,

the maximum current on the wiring arm must be less than 4A.

3. The wiring example above shows a 12-24V DC standard prover

connected to the module. If you use a 5V DC standard prover, make sure the positive wire is connected to the 5V terminal (e.g. Z0 5V DC).

4. If separate power sources are used, do not exceed the specified

isolation voltage.

42569

12-24V DC

NOTE:

Shield ground

Flowmeter Device

Z0 12-24V DC

Z0 5V DC

Z0 Return

Customer VCC

F0 Return

Not used

Output 0

Customer VCC

Z1 12-24V DC

Z1 5V DC

Z1 RET

Not used

Customer Common

Not used

Output 1

F1 Return

Customer Common

–

Shield ground

–

Detector #1 Detector #2

Standard Prover/Detector Wiring Example

71Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

72 Installing the Configurable Flowmeter Module

NOTE: If separate power sources are used, do not exceed the specified isolation voltage.

42570

Load

–

Load

–

Z0 12-24V DC

Z0 5V DC

Z0 Return

Customer VCC

F0 Return

Not used

Output 0

Customer VCC

Z1 12-24V DC

Z1 5V DC

Z1 RET

Not used

Customer Common

Not used

Output 1

F1 Return

Customer Common

Standard Output Wiring Example

After completing field-side wiring, secure the wires in the strain relief area with a cable-tie.

72Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 73

Groove

Side edge of the RTB

Strain relief area

20852-M

WARNING

Assembling the Removable Terminal Block and Housing

Installing the Removable Terminal Block on the Module

1. Align the grooves at the bottom of the housing with the side edges of the RTB.

2. Slide the RTB into the housing until it snaps into place.

When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

Before installing the RTB, make certain:

 field-side wiring of the RTB has been completed.  the RTB housing is snapped into place on the RTB.  the RTB housing door is closed.  the locking tab at the top of the module is unlocked.

73Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

74 Installing the Configurable Flowmeter Module

Module top guide

RTB side guides

20853–M

Locking tab

20854–M

WARNING

1. Align the side, top and bottom RTB guides with the side, top and

bottom module guides.

2. Press quickly and evenly to seat the RTB on the module until the latches snap into place.

Removing the Removable Terminal Block from the Module

3. Slide the locking tab down to lock the RTB onto the module.

When you connect or disconnect the Removable Terminal Block (RTB) with field side power applied, an electrical arc can occur. This could cause an explosion in hazardous location installations.

Be sure that power is removed or the area is nonhazardous before proceeding.

Before removing the module, you must remove the RTB.

74Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Installing the Configurable Flowmeter Module 75

42517

20855–M

1. Unlock the locking tab at the top of the module.

2. Open the RTB door and pull the RTB off the module, as shown in

Figure 5.2.

Figure 5.2

75Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

76 Installing the Configurable Flowmeter Module

WARNING

20856–M

20857–M

Removing the Module

When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations.

1. Push in the locking tabs.

2. Pull the module out of the chassis.

76Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module

Chapter

What this Chapter Contains

This chapter describes how to configure the ControlLogix Configurable Flowmeter module using the RSLogix 5000 software.

Topic Page

Using this Chapter 78

Overview of the Configuration Process 78

Creating a New Module 80

Using the Default Configuration 83

Altering the Default Configuration 84

Accessing the Tags 85

Changing Configuration Information at the Tags 86

Downloading Configuration Data 87

Changing Configuration During CFM Module Operation 88

Using Message Instructions 89

Creating a New Tag 90

Configuring CFM Modules in a Remote Chassis 95

Sample Configuration for High Resolution Frequency Mode 97

Sample Configuration for Totalizer Mode Prover Function 101

Sample Configuration for Totalizer Mode Filler Function 108

You must configure your module upon installation. It will not work with the ladder program until it has been configured.

77Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

78 Configuring the Configurable Flowmeter Module

IMPORTANT

Using this Chapter

This chapter is broken into two sections:

 Overview of the Configuration Process

of how to perform each task mentioned in the overview

 Examples of how to configure your CFM module for any of the

following operational modes:

– High resolution frequency mode – Totalizer mode using the prover function – Totalizer mode using the filler function

This chapter is intended to teach you how to configure the CFM module for basic operation in each of the modes mentioned above. You should be able to use the building blocks learned in this chapter to write more detailed configuration for your CFM module in your specific application.

The examples offered in this chapter only list the tags that need to be changed for specific operational modes. For a complete listing of configuration, input and output tags, see Appendix B.

- Includes a detailed explanation

Overview of the Configuration Process

When you create a CFM module, module-defined data structures and tags are created in RSLogix 5000 software. The information contained in these structures determines your CFM module’s behavior.

The owner-controller sends configuration information to the CFM module in one of the following ways:

 RSLogix 5000 project goes online - Typically, this is the method in

which initial configuration is sent. When the project goes online, a program is downloaded to the controller, and connections are made to all devices that controller owns, including any CFM modules. When a connection is established, the configuration for that particular module is transferred.

 Message instructions - Typically, this method is used after module

operation has begun and additional configuration changes are necessary.

This chapter assumes you have created a Logix controller in a RSLogix 5000 project.

78Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Figure 5 - Overview of the Configuration Process

42863

1.Select a module from the list

2.Choose a Major Revision

Naming Screen Name Description Slot number Comm. format Minor revision

Change Configuration via the Tag Editor

To Alter Default Configuration

To Use Default Configuration

New Module

FINISH

Go online to download new configuration

RPI Screen Set RPI Inhibit module

FINISH

Change configuration via the Tag Editor

Send new configuration via message instruction

Change configuration after module operation has begun

Change configuration before module operation begins

See

page 80

See page 81

See page 84

See page 85

See page 83

See page 87

See page 85

See page 89

Configuring the Configurable Flowmeter Module 79

79Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

80 Configuring the Configurable Flowmeter Module

IMPORTANT

If you are not offline, use this pull-down menu to go offline

A. Select I/O Configuration.

B. Click on the right mouse button

to display the menu.

Creating a New Module

After you have started the RSLogix 5000 software and created a controller, you must create a new CFM module. The wizard allows you to create a new module and set communications options.

You must be offline when you create a new module.

1. Go offline.

2. Select a CFM module.

80Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 81

A. Select a 1756-CFM module

Make sure the Major Revision number matches the label on the side of your module

B. Click here

E. Choose an Electronic

Keying method. For a detailed explanation of this field, go to

page 27

If you want to use default configuration, click here and you are finished configuring your module Go to page 83

If you want to adjust the communications options, click here Go to page 84

D. Make sure the

Minor Revision number matches the label on the side of your module

A. Type a name (optional).

B. Type a description (optional).

C. Choose a Communications

Format. For a detailed description of this field see

page 82

A screen appears with a list of possible new modules for your application.

The new module creation wizard appears.

81Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

82 Configuring the Configurable Flowmeter Module

TIP

IMPORTANT

Communications Format

The communications format determines what type of data is transferred between the CFM module and its owner-controller. This feature also defines the connection between the controller writing the configuration and the module itself.

The following communications formats are available for your CFM module:

 Data - Use this format for a controller that you want to own the CFM

module and control its configuration data.

Only one controller can use the Data communications format when connecting to a CFM module.

 Listen-only Data - Use this format for any controller that you want to

listen to the CFM module but not own it.

Multiple controllers can use the Listen-only Data communications format when connecting to the CFM module. These controllers do not own the CFM module’s configuration and lose their connection to the module if the owner-controller loses

When you select a Listen-only Communications Format, only the General and Connection tabs appear when you view a module’s properties in RSLogix 5000 software.

The screen below shows the choices available.

Once the module is created, the communications format cannot be changed. The module must be deleted and recreated.

82Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 83

Click here and you will accept the CFM module’s default configuration. Go to page 83 to learn how to download configuration.

Electronic Keying

When you create a new CFM module, you can choose how specific the keying must be when a module is inserted into the CFM module’s slot in the chassis.

The screen below shows the choices available.

Using the Default Configuration

For more information, see Electronic Keying

If you want to use the default configuration, click on Finish as shown below. See page 87 module operation.

to download the default configuration information and begin

on page 27.

83Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

84 Configuring the Configurable Flowmeter Module

If you want a Major Fault on the Controller to occur if there is connection failure with the I/O module, click here

This Fault box is empty when you are offline. If a fault occurs while the module is online, the type of fault will be displayed here

Inhibit the connection to the module here

Adjust the Requested Packet Interval here.

Click here to finish this portion of configuration and move to the Tag Editor, see page 85

IMPORTANT: Minimum RPI values:

 50 ms for one channel in totalizer mode  100 ms for two channels in totalizer mode  5 ms for one channel in high resolution

frequency mode

 10 ms for two channels in high resolution

frequency mode

 55 ms for one channel in each mode

IMPORTANT

Altering the Default Configuration

If you want to alter or view the default configuration, click on Next. On the next wizard screen, you can change the CFM module’s configuration as shown below.

After you are finished with the screen above, you must access the module tags, via the Tag Editor, to make additional configuration changes, see page 85

Two additional wizard screens appear during initial module configuration. The screens are used during online application monitoring but are shown below to give you an accurate description of the screens that appear during initial configuration.

84Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 85

A. Select Controller Tags

B. Right-click to display the menu

C. Select Monitor Tags

Click on the tag name of the data structure you want to see

Configuration information is listed for each channel on the module.

Accessing the Tags

When you access tags to change configuration or monitor the I/O data exchange, you have two options:

 Monitor tags - This option allows you to view tags and change their

values.

 Edit tags - This option allows you to add or delete tags but not to

change their values.

1. Access the tags.

2. View tags here.

85Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

86 Configuring the Configurable Flowmeter Module

A. Click on the far left side of the

Value column and a pull-down menu appears.

B. Highlight the point that needs to be

changed and type a valid new value.

A. Highlight the value of the

feature you want to change.

B. Type in the valid new value.

Changing Configuration Information at the Tags

Some configurable features are changed on a module-wide basis and some on a point-by-point basis.

Configurable Features

There are two ways to change the configuration:

 Use a pull-down menu.  Highlight the value of a particular feature for a particular point and type

a new value.

Pull-down Menu

Highlight Value

86Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 87

A. Click on the triangle to

see the pull-down menu.

B. Click on Download.

Click here to download new data

Downloading Configuration Data

After you have changed the configuration data for an CFM module, the change does not actually take affect until you download the new program which contains that information. This downloads the entire program to the controller overwriting any existing programs.

1. Download the configuration data.

RSLogix 5000 software verifies the download process with this pop-up screen.

This completes the download process.

87Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

88 Configuring the Configurable Flowmeter Module

Double-click here to enter the Main Routine

Changing Configuration During CFM Module Operation

After the CFM module has begun operation, you can only change configuration by using ladder logic and message instructions.

Follow these steps to change CFM module configuration during operation:

1. Access the CFM data structures through the tag monitor to make specific configuration changes, see page 85

2. Use ladder logic and a configuration message instruction to send the configuration changes to the CFM module, see below through page 94

Using Ladder Logic

You must use ladder logic to perform the following operations on your CFM module:

 change configuration  perform run time services

Ladder logic uses message instructions to exchange data between the controller and CFM module. You can access the ladder logic by double-clicking on the Main Routine portion of the MainProgram.

88Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 89

Using Message Instructions

Ladder logic uses message instructions to change the CFM module configuration during module operation.

Message instructions maintain the following characteristics:

 messages use unscheduled portions of system communications

bandwidth

 one service is performed per instruction

 performing module services does not impede module functionality, such

as counting incoming pulses

Processing Real-Time Control and Module Services

Because message instructions use unscheduled portions of systems communications bandwidth, the services requested of an CFM module are not guaranteed to occur within a specific time period. Although the module response typically occurs in less than a second, there is no specific time interval that reflects this response.

One Service Performed Per Instruction

Message instructions only cause a module service to be performed once per execution. For example, if a message instruction sends new configuration data to the CFM module, the message instruction must be reexecuted to update send the configuration data in the future.

89Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

90 Configuring the Configurable Flowmeter Module

Double-click here to enter the Main Routine

A. Right-click on the rung to see

the pull-down menu.

B. Click on Add Ladder Element.

A. Choose the Message element.

B. Click here.

Creating a New Tag

Ladder logic is written in the Main Routine section of RSLogix 5000 software.

1. Access the Main Routine.

2. Add a message instruction to Rung 0.

3. Choose a Message element from the Choose Ladder

Element screen.

90Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 91

A. Right-click on the question

mark (?) to see the pull-down menu.

B. Click on New Tag.

IMPORTANT

Name the tag here.

Choose the Base Tag Type here.

Choose the Message Data Type here.

Choose the Controller Scope here.

IMPORTANT: Message tags can only be created with the Controller Scope.

Enter an optional description here.

4. Create a tag for the message instruction.

Fill in the following information when the New Tag pop-up screen appears:

We suggest you name the tag to indicate what module service is sent by the message instruction. For example, the message instruction below is used to write configuration.

91Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

92 Configuring the Configurable Flowmeter Module

Click here to see the message configuration pop-up screens

Message Type is CIP Generic

Service Code is 4c Class Name is 4 Instance Name is 16

Source is Local:1:C

Num. Of Elements is 300

Enter Message Configuration

After creating a new tag, you must enter message configuration.

Enter message configuration on the following screens:

A description of the purpose and set-up of each screen follows.

Configuration Pop-Up Screen

This screen provides information on what module service to perform and where to perform it.

 Configuration Pop-Up Screen  Communications Pop-Up Screen  Tag Pop-Up Screen

For example, the screen below shows the information needed to send a configuration message (module service) to a 1756-CFM module (where to perform service).

This table contains information that must be entered on the configuration screen to perform the example CFM module service:

Field Select

Service Code 4c

Class Name 4

Instance Name 16

Source Local:1:C (dependent on module location)

Number of Elements 300

Destination N/A

92Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 93

Use the Browse button to choose the CFM module that you want to send configuration changes to.

Communications Pop-Up Screen

This pop-up screen provides information on the path of the message instruction. For example, the slot number of a 1756-CFM module distinguishes exactly which module a message is designated for.

93Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

94 Configuring the Configurable Flowmeter Module

IMPORTANT

Tag Pop-Up Screen

This screen provides an opportunity to change some characteristics of the newly created tag. Access this screen to change a tag’s:

 Name  Description  Style  Number of consumers

You must add a second Apply rung to the ladder logic to send configuration to the CFM module.

94Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 95

A. Select I/O Configuration.

B. Click on the right mouse

button to display the menu.

C. Select New Module

Configuring CFM Modules in a Remote Chassis

ControlLogix ControlNet Interface modules (1756-CNB or 1756-CNBR) are required to communicate with CFM modules in a remote chassis.

You must configure the communications module in the local chassis and the remote chassis before adding new I/O modules to the program.

1. Create a 1756-CNB or 1756-CNBR module in the local chassis.

2. Choose a 1756-CNB or 1756-CNBR module on the Select Module Type

screen.

3. Configure the 1756-CNB or 1756-CNBR module.

For more information on the ControlLogix ControlNet Interface modules, see the ControlLogix ControlNet Interface User Manual, publication 1756-6.5.3.

95Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

96 Configuring the Configurable Flowmeter Module

A. Select the local communications module.

B. Click on the right mouse button and select

New Module.

Notice that the remote 1756-CNB module is added to the Controller Organizer through the local 1756-CNB module.

IMPORTANT

A. Select the remote communications module.

B. Click on the right mouse button and select

New Module.

4. Create a 1756-CNB or 1756-CNBR module for the remote chassis.

5. Choose a 1756-CNB or 1756-CNBR module on the Select Module Type

screen.

6. Configure the remote 1756-CNB or 1756-CNBR module.

7. Add remote CFM modules to your configuration through the remote

1756-CNB or 1756-CNBR module.

8. Configure remote CFM modules using the same procedures detailed earlier in this chapter to configure local CFM modules.

You must run RSNetWorx for ControlNet software for the owner-controller to establish connections, and send configuration information, with the remote CFM module.

96Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 97

Fin (250 x 10-9)

sample

Resolution =

Where:

 F

is the input frequency

 T

sample

is the sample time period

Sample Configuration for High Resolution Frequency Mode

High resolution frequency mode provides speed control of machinery such as turbines where shutdown on acceleration or speed is required independent of the owner-controller. Speed is calculated without the K-factor but includes the meter factor and CCF for special calculations.

When using this mode, you may calculate resolution by using the following equation to calculate resolution.

Table 6 - Sample Resolutions

60Hz 0.033 seconds 0.00045Hz

5000Hz 0.020 seconds 0.0625Hz

50,000Hz 0.050 seconds 0.25Hz

The values listed in Table 6

sample

Resolution

are listed for example purposes. Specific values will

change according to your application.

This section offers a sample configuration to configure your CFM module for high resolution frequency mode. In this configuration, channel 0 is configured and channel 1 is left unused.For a detailed explanation of the features available in this mode, see page 36

97Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

98 Configuring the Configurable Flowmeter Module

Follow the steps below to configure your CFM module for high resolution frequency mode.

1. Create a new module, see page 80

2. Set all communications options, including:

 name  communication format  slot number  minor revision  electronic keying  RPI - For this application, the minimum RPI = 5 ms

See pages 81

3. Access the module tags via the Tag Editor, see page 85

4. Change only the tags listed in Table 7

to 84.

. You can ignore all other tags;

they do not affect high resolution frequency mode

Table 7 - Tag Changes Required for High Resolution Frequency Mode

Name Style Data type Definition Enter this

Value

C.Ch0LowFreqClear Decimal BOOL Enables the minimum detectable frequency level for

Channel 0. Set the bit to 1 to enable it

C.Operations[0].OperationalMode Decimal SINT Sets the module’s operational mode.

0 = OFF 1 = Totalizer Mode 2 = Non-Resettable Totalizer Mode 3 = High Resolution Frequency Mode

C.Operations[1].OperationalMode Decimal SINT Sets the module’s operational mode.

0 = OFF 1 = Totalizer Mode 2 = Non-Resettable Totalizer Mode 3 = High Resolution Frequency Mode

C.Operations[0].AccelCalculation Decimal SINT Number of past samples to use to calculate an

acceleration value. Sample range is 0 to 255.

C.Operations[0].MeterFactor Float REAL Calibration Adjust for metering reading applied after

K-factor correction. Typically, this factor is between

0.8 and 1.2 but the module restricts the value>

C.Operations[0].FilterResolution Float REAL Sets resolution of the Speed calculation based on the

raw counts 0 = default of 0.00001

0.00001 = resolution of + counts.

1 count of 100,000 raw

0.00001

98Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configuring the Configurable Flowmeter Module 99

Table 7 - Tag Changes Required for High Resolution Frequency Mode

Name Style Data type Definition Enter this

Value

C.Operations[0].SampleTime Float REAL Sets time for a sample to be taken.

(2.0 second maximum sample time for high resolution frequency mode and 5.0 second maximum sample time for totalizer mode)

C.Operations[0].HighestAllowedFreq Float REAL User-defined value between MinDetectableFreq and

120,000 When the frequency reaches this level, it sets the Overspeed alarm limit

C.Operations[0].AccelAlarmValue Float REAL Sets Acceleration alarm limit

-Maximum acceleration (cycles per second

)

<AccelAlarmValue< +Maximum acceleration (cycles per second

)

C.OutputSetup[0].TriggerOn Decimal SINT Sets when output 0 energizes

0 = No Action 1 = Frequency 2 = Acceleration 3 = Full Flow State (N/A in this mode) 4 = Trickle Flow State (N/A in this mode) 5 = Prover Run State (N/A in this mode) 6 = Prover Range State (N/A in this mode)

C.OutputSetup[0].TieToCounter Ties a channel to output 0

0 = No connection 1 = Connect Channel0 to Output0 2 = Connect Channel1 to Ouput0

0.033

3700

100

O.Total[0].CombinedCorrectionFactor Float REAL 0 = Default value of 1.0

Use this value to convert from Hz to RPMs. Results are displayed in Frequency Average only

O.Total[0].Overrange Decimal BOOL Enables the Overrange alarm on output connected to

channel 1. When the Frequency Average exceeds 100KHz, this alarm is set. 0 = No Alarm 1 = Alarm Enabled

99Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

100 Configuring the Configurable Flowmeter Module

Table 7 - Tag Changes Required for High Resolution Frequency Mode

Name Style Data type Definition Enter this

Value

O.Total[0].Overspeed Decimal BOOL Enables the Overspeed alarm on output connected to

channel 0. When the Speed exceeds the Highest Allowed Frequency value, this alarm is set. 0 = No Alarm 1 = Alarm Enabled

O.Total[0].Acceleration Decimal BOOL Enables the Acceleration alarm on output connected

to channel 0. When the absolute acceleration exceeds the Acceleration Alarm value, this alarm is set. 0 = No Alarm 1 = Alarm Enabled

I.Status[0].FreqAverage Float REAL Displays frequency averaged over the Meter samples

on channel 0

I.Status[0].Acceleration Float REAL Displays acceleration on channel 0 as calculated by

using AccelCalculation samples

I.Ch0OverrangeAlarm Decimal BOOL Displays whether overrange alarm was set on

channel 0 0 = alarm was not set 1 = alarm was set

I.Ch1AccelerationAlarm Decimal BOOL Displays whether acceleration alarm was set on

channel 0 0 = alarm was not set 1 = alarm was set

I.Ch1OverspeedAlarm Decimal BOOL Displays whether overspeed alarm was set on

channel 0 0 = alarm was not set 1 = alarm was set

5. Use ladder logic and a message instructions to send the new configuration to your CFM module, see page 89

100Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Rockwell Automation 1756-CFM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Summary of Changes

New and Updated Information

Preface

Who Should Use This Manual

Additional Resources

What this Chapter Contains

Using a ControlLogix CFM Module

Module Features

Physical Features

Typical Applications

Understanding Module Input Capabilities

Understanding Module Output Capabilities

Using Module Identification and Status Information

What This Chapter Contains

Ownership

Using RSNetWorx and RSLogix 5000 Software

CFM Modules in Local Chassis

CFM Modules in Remote Chassis

Connections

Direct Connections

Listen-Only Connections

Configurable Flowmeter Modules in a Local Chassis

Requested Packet Interval (RPI)

Configurable Flowmeter Modules in a Remote Chassis

What this Chapter Contains

Understanding General Module Features

Removal and Insertion Under Power (RIUP)

Module Fault Reporting

Fully Software Configurable

Electronic Keying

Producer/Consumer Model

Module Status Information

Configurable Flowmetering Channels

Flowmeter Inputs

Gate Inputs

User-Defined Preset and Rollover Values

Current-Sourcing Outputs

Choosing an Operational Mode

Operating in High Resolution Frequency Mode

Terminal Usage in High Resolution Frequency Mode

Output Operation in Frequency Mode

Module Features Used in High Resolution Frequency Mode

Alarms in High Resolution Frequency Mode

Sample Configuration for High Resolution Frequency Mode

Operating in Totalizer Mode

Nonresettable Totalizer

Terminal Usage in Totalizer Mode

Output Operation in Totalizer Mode

Using the Totalizer Mode Prover Function

Using a Prover

Features Available with the Prover Function

Alarms with the Prover Function

Sample Configuration for Totalizer Mode Prover Function

Using the Totalizer Mode Filler Function

Trickle Function for Totalizer Mode

Configurable Features Available with the Totalizer Mode Filler Function

Alarms with the Filler Function

Sample Configuration for Totalizer Mode Filler Function

Configurable Output Behaviors

How To Enable Output Behavior Configuration

What this Chapter Contains

Power Requirements

Installing the Module

Keying the Removable Terminal Block/Interface Module

Key the Module

Key the RTB/IFM

Wiring the Removable Terminal Block

Connect Grounded End of the Cable

Connect Ungrounded End of the Cable

Connect Wires to the RTBs

Wiring the Module

Standard Flowmeter Wiring Example

Standard Prover/Detector Wiring Example

Standard Output Wiring Example

Assembling the Removable Terminal Block and Housing