Allen-Bradley controllogix 1756-L61 User manual

ControlLogix System User Manual
Catalog Numbers 1756-L61, 1756-L62, 1756-L63, 1756-L63XT, 1756-L64, 1756-L65, 1756-L71, 1756-L72, 1756-L73,
1756-L73XT, 1756-L74, 1756-L75
User Manual

Important User Information
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 available from
your local Rockwell Automation® sales office or online at http://www.rockwellautomation.com/literature/) describes some
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.
Allen-Bradley, CompactLogix, ControlLogix, DriveLogix, FLEX, Kinetix, MessageView, MicroLogix, POINT I/O, PhaseManager, PowerFlex, RSFieldbus, RSLinx, RSLogix, RSNetWorx, Rockwell Software, Rockwell
Automation, Compact I/O, RediSTATION, Series 9000, FlexLogix, PanelView, FactoryTalk, ArmorPOINT, Stratix 8000, SLC, ControlFLASH, DH+, Data Highway Plus, Integrated Architecture, Logix5000,
ControlLogix-XT, GuardLogix, RSView, Encompass, 1336 FORCE, 1336 PLUS, 1336 IMPACT, SMC, RSBizWare, FLEX Ex, ArmorBlock, ArmorBlock MaXum, Guard PLC, and TechConnect are trademarks of Rockwell
Automation. Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
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.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.

Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 3
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
Added 1756-L73XT controller and GuardLogix User Manual reference 11
USB Cable Text 19
Added energy storage module information relating to safety and extreme temperature
controllers.
26
Parts Not Included with the 1756-L6x Controller 33
Added double data rate (DDR) communication reference for 1756-L7xcontroller 43
Added 1756-L71, 1756-L73XT controllers and chassis, and changed version information for
1756-L72, 1756-L73, 1756-L74, and 1756-L75 controllers
51
Added upgrade restrictions 52
Added information about mode switch operation on the controller 63
Controller mode can be changed in RSLogix 5000 software. 64
1756-ESMNSE µjoules correction from 200…40 72
Added 1756-L71 information to ControlLogix controller features 87
Added 1756-L71 and 1756-L73XT memory options 88
Added double data rate (DDR) communication information 95
Added 1756-A7XT chassis information 132
Added information about the ‘Flashing Red’ OK status indicator for nonrecoverable faults 208
History for 1756-UM001L-EN-P publication 221

4Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Summary of Changes
Notes:

Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 5
Table of Contents
Preface ControlLogix Controllers Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Traditional ControlLogix Controllers . . . . . . . . . . . . . . . . . . . . . . . . . 11
Redundant ControlLogix Controllers. . . . . . . . . . . . . . . . . . . . . . . . . . 12
Extreme Environment ControlLogix Controllers . . . . . . . . . . . . . . . 12
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Required Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Chapter 1
Install the 1756-L7x Controller
Environment and Enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Prevent Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Removal and Insertion Under Power (RIUP). . . . . . . . . . . . . . . . . . . 18
European Hazardous Location Approval . . . . . . . . . . . . . . . . . . . . . 18
CompactFlash/SD Card Capability. . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
USB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
North American Hazardous Location Approval . . . . . . . . . . . . . . . . 19
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1756-L7x Controller Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Parts Included with the 1756-L7x Controller . . . . . . . . . . . . . . . . . . . 20
Parts Available for Use with the 1756-L7x Controller . . . . . . . . . . . 21
1756-L7x Controller Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Insert the Controller into the Chassis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Insert the Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Remove the SD Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Install the SD Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Uninstall the ESM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Install the ESM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Chapter 2
Install the 1756-L6x Controller
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Environment and Enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Programmable Electronic Systems (PES) . . . . . . . . . . . . . . . . . . . . . . . 30
Preventing Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Removing Module While Under Power (RIUP) . . . . . . . . . . . . . . . . 30
European Hazardous Location Approval . . . . . . . . . . . . . . . . . . . . . 30
USB Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
North American Hazardous Location Approval . . . . . . . . . . . . . . . . 31
Lithium Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
1756-L6x Controller Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Parts Not Included with the 1756-L6x Controller. . . . . . . . . . . . . . . 33
1756-L6x Controller Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
CompactFlash Card Installation and Removal. . . . . . . . . . . . . . . . . . . . . . 34

6Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Table of Contents
Battery Connection and Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Insert the Controller into the Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Remove the Controller from the Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Chapter 3
Start Using the Controller
Make Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
1756-L7x Connection Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
1756-L6x Connection Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Connect to the 1756-L7x Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Set Up the USB Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Connect to the 1756-L6x Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Configure the Serial Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Upgrade Controller Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Determine Required Controller Firmware . . . . . . . . . . . . . . . . . . . . . . 52
Obtain Controller Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Use ControlFLASH Utility to Upgrade Firmware. . . . . . . . . . . . . . . 53
Use AutoFlash to Upgrade Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Set the Communication Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Go Online with the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Download to the Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Use the Who Active Dialog Box to Download . . . . . . . . . . . . . . . . . . 60
Use the Controller Status Menu to Download . . . . . . . . . . . . . . . . . . 61
Upload from the Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Use the Who Active Dialog Box to Upload . . . . . . . . . . . . . . . . . . . . . 61
Use the Controller Status Menu to Upload . . . . . . . . . . . . . . . . . . . . . 62
Choose the Controller Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Use the Mode Switch to Change the Operation Mode . . . . . . . . . . . 63
Use RSLogix 5000 Software to Change the Operation Mode . . . . . 65
Load or Store to the Memory Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Store to the Memory Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Load from the Memory Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Other Memory Card Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Use ControlLogix Energy Storage Modules (ESMs) . . . . . . . . . . . . . . . . . 72
Save the Program to On-board NVS Memory . . . . . . . . . . . . . . . . . . . 73
Clear the Program from On-board NVS Memory . . . . . . . . . . . . . . . 74
Estimate the ESM Support of the WallClockTime . . . . . . . . . . . . . . . . . . 74
Maintain the Battery
(1756-L6x controllers only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Check the Battery Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
1756-BA1 or 1756-BATA Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . 76
1756-BATM Battery Module and Battery Life . . . . . . . . . . . . . . . . . . 77
Estimate 1756-BA2 Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Estimate 1756-BA2 Battery Life after Warnings. . . . . . . . . . . . . . . . . 79
Battery Storage and Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 7
Table of Contents
Chapter 4
ControlLogix System and Controllers
The ControlLogix System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Configuration Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Design a ControlLogix System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
ControlLogix Controller Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
System, Communication, and Programming Features . . . . . . . . . . . 87
Memory Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Chapter 5
Communication Networks
Networks Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
EtherNet/IP Network Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
ControlLogix EtherNet/IP Module Features . . . . . . . . . . . . . . . . . . . 92
ControlLogix EtherNet/IP Communication Modules. . . . . . . . . . . 93
Software for EtherNet/IP Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Connections Over an EtherNet/IP Network . . . . . . . . . . . . . . . . . . . 94
Double Data Rate (DDR) Backplane Communication . . . . . . . . . . 95
ControlNet Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
ControlLogix ControlNet Module Features . . . . . . . . . . . . . . . . . . . . 97
ControlLogix ControlNet Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Software for ControlNet Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Connections Over a ControlNet Network . . . . . . . . . . . . . . . . . . . . . 98
DeviceNet Network Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
ControlLogix DeviceNet Module Features . . . . . . . . . . . . . . . . . . . . . 99
ControlLogix DeviceNet Bridge Module and Linking Devices . . 100
Software for DeviceNet Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Connections Over DeviceNet Networks . . . . . . . . . . . . . . . . . . . . . . 100
ControlLogix DeviceNet Module Memory . . . . . . . . . . . . . . . . . . . . 100
Data Highway Plus (DH+) Network Communication . . . . . . . . . . . . . 101
Communicate Over a DH+ Network . . . . . . . . . . . . . . . . . . . . . . . . . 102
Universal Remote I/O (RIO) Communication . . . . . . . . . . . . . . . . . . . . 102
Communicate Over a Universal Remote I/O Network . . . . . . . . . 104
Foundation Fieldbus Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
HART Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

8Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Table of Contents
Chapter 6
Serial Communication (1756-L6x
controllers only)
1756-L6x Controller Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
ControlLogix Chassis Serial Communication Options. . . . . . . . . . 110
Communication with Serial Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
DF1 Master Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
DF1 Point to Point Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
DF1 Radio Modem Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
DF1 Radio Modem Advantages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
DF1 Radio Modem Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
DF1 Radio Modem Protocol Parameters. . . . . . . . . . . . . . . . . . . . . . . 114
DF1 Slave Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
DH-485 Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
ASCII Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Configure the 1756-L6x Controller for Serial Communication. . . . . . 117
Broadcast Messages Over a Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Configure Controller Serial Port Properties. . . . . . . . . . . . . . . . . . . . 120
Program the Message Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Modbus Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Chapter 7
Manage Controller Communication
(connections)
Connection Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Produce and Consume (interlock) Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Connection Requirements of a Produced or Consumed Tag . . . . 124
Send and Receive Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Determine Whether to Cache Message Connections . . . . . . . . . . . 126
Calculate Connection Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Local Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Remote Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Connections Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Chapter 8
I/O Modules
Selecting ControlLogix I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Local I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Add Local I/O to the I/O Configuration . . . . . . . . . . . . . . . . . . . . . . 132
Remote I/O Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Add Remote I/O to the I/O Configuration . . . . . . . . . . . . . . . . . . . . 135
Distributed I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Add Distributed I/O to the I/O Configuration . . . . . . . . . . . . . . . . 139
Reconfigure an I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Reconfigure an I/O Module via the Module Properties . . . . . . . . . 141
Reconfigure an I/O Module via a Message Instruction . . . . . . . . . . 142
Add to the I/O Configuration While Online . . . . . . . . . . . . . . . . . . . . . . 142
Modules and Devices that Can be Added While Online. . . . . . . . . 143
Online Additions - ControlNet Considerations . . . . . . . . . . . . . . . . 145

Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 9
Table of Contents
Online Additions - EtherNet/IP Considerations. . . . . . . . . . . . . . . 148
Determine When Data is Updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Chapter 9
Develop Motion Applications
Motion Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Motion Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Obtain Axis Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Program Motion Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Chapter 10
Develop Applications
Elements of a Control Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Tasks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Task Priority. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Scheduled and Unscheduled Programs . . . . . . . . . . . . . . . . . . . . . . . . 163
Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Programming Languages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Add-On Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Monitoring Controller Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Monitoring I/O Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Determine if I/O Communication has Timed Out. . . . . . . . . . . . . 169
Determine if I/O Communication to a Specific I/O Module has
Timed Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Interrupt the Execution of Logic and Execute the Fault Handler 170
System Overhead Time Slice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Configure the System Overhead Time Slice. . . . . . . . . . . . . . . . . . . . 172
Sample Controller Projects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Chapter 11
Using the PhaseManager Tool
PhaseManager Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Minimum System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177
State Model Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
How Equipment Changes States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Manually Change States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
PhaseManager Tool versus Other State Models . . . . . . . . . . . . . . . . . . . . 180
Equipment Phase Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

10 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Table of Contents
Chapter 12
Redundant Systems
ControlLogix Redundancy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
System Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Enhanced versus Standard Redundancy. . . . . . . . . . . . . . . . . . . . . . . . 187
Build a Redundant System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
ControlNet Considerations in Redundant Systems. . . . . . . . . . . . . . . . . 188
EtherNet/IP Considerations in Redundant Systems. . . . . . . . . . . . . . . . 189
IP Address Swapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Redundancy and Scan Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Chapter 13
SIL 2 Certification
Introduction to SIL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Programming and Debugging Tool (PADT) . . . . . . . . . . . . . . . . . . . 193
Typical SIL2 Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Fail-safe Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
High-availability Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Fault-tolerant Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
Appendix A
Status Indicators
1756-L7x Controller Status Display and Indicators . . . . . . . . . . . . . . . . 199
1756-L7x Controller Status Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
General Status Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Fault Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Major Recoverable Fault Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
I/O Fault Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
1756-L7x Controller Status Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
RUN Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
FORCE Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
SD Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
OK Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
1756-L6x Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
RUN Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
I/O Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
FORCE Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
RS232 Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
BAT Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
OK Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211