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Allen-Bradley Manuals
Control Systems
ControlLogix 1756-CNB
User manual
Allen-Bradley 1756-CNB User Manual
Controllogix redundancy system
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Also See for 1756-CNB
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User manual
(203 pages)
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Installation instructions manual
(36 pages)
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
How to Use this Manual
Purpose of this Manual
When to Use this Manual
Who Should Use this Manual
Related Documentation
Introduction
Chapter 1
About the Main Parts of a Redundant System
Firmware Combinations that Make up a Redundant System
Important Terms in a Redundant System
Primary Chassis
Switching from One Controller to Another
Network Access Port
Bump in Outputs During a Switchover
Keep the Second Controller up to Date
Making Online Edits
Increasing Scan Time
Network Addresses During a Switchover
Controlnet Network
Ethernet/Ip Network
Quick Start Checklists
Chapter 2
Introduction
Laying out the System
Placement of a Pair of Redundant Chassis
If You Need more than 100 Meters between Chassis
Placement of the I/O
Placement of Operator Interface Terminals
Additional Redundant Components
Redundant Controlnet Media
Redundant Power Supplies
Checking Connection Requirements
Planning a Controlnet Network
Planning an Ethernet/Ip Network
Worksheet for IP Swapping
How an Ethernet/Ip Module Handles a Cable Break
Additional Design Considerations
Chapter 3 Introduction
Preliminary Information
Install the Chassis for the Controllers
Install Modules in the First Redundant Chassis
Install Modules in the Second Redundant Chassis
Install the Remote Chassis or Rails
Publication 1756-UM523F-EN-P - December
Configure Ethernet/Ip Modules
Flash the Modules
Check the Installation
Actions
Chapter 4 Introduction
Open the SRM Configuration Tool
Before You Begin
Actions
What to Do Next
Check the Revision of Your SRM Configuration Tool
Before You Begin
Actions
Set the SRM Clock
Before You Begin
Actions
Test a Switchover
Before You Begin
Actions
Change Auto-Synchronization
Actions
Change Program Control
Before You Begin
Actions
Introduction
Chapter 5 Plan for Online Edits
Decide if You Want to Keep Test Edits after a Switchover
Be Aware that Finalizing Edits Removes Your Original Logic
Decide How You Want to Set Aside Unused Memory
Configure a Controller for Redundancy
Configure Communications
Configure Produced Tags
Configure Message (MSG) Instructions
Configure Tags for an HMI
Estimate the Crossload Time of a Program
Before You Begin
Actions
Minimize Scan Time
Maintain Data Integrity During a Switchover
Look for Array Shift Instructions
Look for Scan-Dependent Logic
Take Preventative Actions
Determine the Status of Your Redundant System
Actions
Example 1: Ladder Diagram
Example 2: Structured Text
Check Your Work
Additional Resources
Condition Logic to Run after a Switchover
Example 1: Ladder Diagram
Example 2: Structured Text
Send a Message to the SRM
Before You Begin
Actions
Download the Project to the Primary Controller
Schedule a Controlnet Network
Schedule a New Network
Update the Schedule of an Existing Network
Check the Keepers
Save the Project for each Controller
Set Task Watchdog Times
Chapter 6
Introduction
Diagnose a Switchover or Disqualification
Actions
Maintain and Troubleshoot the System
Then See this Section
Troubleshoot a Failure to Synchronize
Update a Keeper Signature
Before You Begin
Actions
Edit Sessions in Progress
Actions
Interpret the SRM Event Log
Before You Begin
Actions
Interpret SRM Events
Export the SRM Event Log
Before You Begin
Actions
Manually Synchronize the Chassis
Optimize Communication
Choose a Greater System Overhead Time Slice
Enter a System Overhead Time Slice
Make All Your Tasks Periodic
Adjust CPU Usage for a CNB Module
Check the Allocation of Unused Memory
Publication 1756-UM523F-EN-P - December
Four-Character Display
Use Rslinx Software
Send a Message to the CNB Module
Store or Load a Project Using Nonvolatile Memory
Store a Project to Nonvolatile Memory While a Process Is Running
Chapter 7 Introduction
Change CNB Modules from Series D to Series E While Online
Before You Begin
Actions
Update a Redundant Control System Offline
Update an Online Redundant System
Redundant System Relationships
Appendix A Introduction
Keep an HMI Communicating with the Primary Chassis
Install the Controllogix Redundancy Alias Topic Switcher Software
Configure a Driver to Communicate with the Primary and Secondary Ethernet/Ip Modules
Create a DDE/OPC Topic for each Controller
Create an Alias Topic
Set up the Alias Topic Switcher
Address the Alias Topic in the HMI Project
Keep a Message Going to the Primary Chassis
Create a Periodic Trigger for the Messages
Get the Redundancy State of Chassis a
Get the Redundancy State of Chassis B
Determine Which Chassis Is Primary
Send the Message to the Appropriate Controller
Appendix B Introduction
Convert Local Modules to Remote Modules
Reconfigure the Local I/O Modules
Replace Local I/O Tags
Replace any Aliases to Local I/O Tags
Appendix C Introduction
Attributes of the Redundancy Object
Appendix D Introduction
Losing Communication While Bridging Via a Series B Controlnet Bridge Module
Communication Stoppage While Using a Series B Controlnet Bridge Module
Appendix E Introduction
Redundant System Restrictions
Index
Index
Index
Rockwell Automation Support
Installation Assistance
New Product Satisfaction Return
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Quick Links
1
Table of Contents
2
Introduction
3
About the Main Parts of a Redundant System
4
Network Access Port
5
Maintain and Troubleshoot the System
Download this manual
See also:
Instruction and Installation Manual
ControlLogix
Redundancy
System
Catalog Numbers 1756-CNB/D/E,
1756-CNBR/D/E, 1756-ENBT,
1756-EWEB, 1756-L55,
1756-L55M12, 1756-L55M13,
1756-L55M14, 1756-L55M16,
1756-L55M22, 1756-L55M23,
1756-L55M24, 1756-L61, 1756-L62,
1756-L63, 1757-SRM
User Manual
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This manual is also suitable for:
1756-cnd: 1756-cne
1756-enbt
1756-eweb
1756-l55
1756-l55m12
1756-l55m13
...
Show all
1756-l55m14
1756-l55m16
1756-l55m22
1756-l55m23
1756-cnbe
1756-l55m24
1756-l61
1756-l62
1756-cnbr
1757-srm
1756-l63
1756-cnbd
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