Rockwell Automation Allen-Bradley Micro820 User manual

User Manual Original Instructions
Micro820 Programmable
Controllers
Catalog Numbers 2080-LC20-20QWB, 2080-LC20-20QBB,
2080-LC20-20AWB, 2080-LC20-20QWBR, 2080-LC20-20QBBR,
2080-LC20-20AWBR

2Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Micro820 Programmable Controllers User Manual
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and operation of this equipment before you
install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to
requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained
personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any
particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
These labels may also be on or inside the equipment to provide specific precautions.
The following icon may appear in the text of this document.
Rockwell Automation recognizes that some of the terms that are currently used in our industry and in this publication are not in alignment with the
movement toward inclusive language in technology. We are proactively collaborating with industry peers to find alternatives to such terms and
making changes to our products and content. Please excuse the use of such terms in our content while we implement these changes.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which
may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage,
or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT Identifies information that is critical for successful application and understanding of the product.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage
may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach
dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc
Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory
requirements for safe work practices and for Personal Protective Equipment (PPE).
Identifies information that is useful and can help to make a process easier to do or easier to understand.

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 3
Table of Contents
Preface
About This Publication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Conformal Coated Catalogs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Download Firmware, AOP, EDS, and Other Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Summary of Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chapter 1
Hardware Overview Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Inputs and Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Embedded microSD Card Slot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Embedded RS-232/RS-485 Serial Port Combo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Embedded Ethernet Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 2
About Your Controller Programming Software for Micro800 Controllers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Obtain Connected Components Workbench Software . . . . . . . . . . . . . . . . . . . . . . . . . 13
Use Connected Components Workbench Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Controller Changes in Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Using Run Mode Change (RMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Uncommitted Changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
RMC Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Limitations of RMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Using Run Mode Configuration Change (RMCC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using Modbus RTU Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Using EtherNet/IP Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Daylight Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Disconnecting Main Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Safety Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Periodic Tests of Master Control Relay Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Isolation Transformers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Supply Inrush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Loss of Power Source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Input States on Power Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Other Types of Line Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Preventing Excessive Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Master Control Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Using Emergency-stop Switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 3
Install Your Controller Controller Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Module Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Table of Contents
DIN Rail Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Panel Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Connect the Controller to an EtherNet/IP Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Install the microSD Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Install the 2080-REMLCD Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Chapter 4
Wire Your Controller Wiring Requirements and Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Wire Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Use Surge Suppressors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Recommended Surge Suppressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Grounding the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Controller I/O Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Minimize Electrical Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Analog Channel Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Minimize Electrical Noise on Analog Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Grounding Your Analog Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Wiring Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Wiring Analog Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Chapter 5
Communication Connections Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Supported Communication Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Modbus RTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
CIP Serial Client/Server – RS-232 only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
ASCII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Modbus TCP Client/Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
CIP Symbolic Client/Server. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
CIP Client Messaging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Sockets Client/Server TCP/UDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
CIP Communications Pass-thru. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Examples of Supported Architectures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Use Modems with Micro800 Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Making a DF1 Point-to-Point Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Construct Your Own Modem Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Configure Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Configure CIP Serial Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Configure Modbus RTU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Configure ASCII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Configure Ethernet Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Validate IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Ethernet Host Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
OPC Support Using FactoryTalk Linx. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

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Table of Contents
Chapter 6
Program Execution in Micro800 Overview of Program Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Execution Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Optional Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Controller Load and Performance Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Periodic Execution of Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Power Up and First Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Variable Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Memory Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Guidelines and Limitations for Advanced Users. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Chapter 7
Controller Security Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Exclusive Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Work with a Locked Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Upload from a Password-Protected Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Debug a Password-Protected Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Download to a Password-Protected Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Transfer Controller Program and Lock Receiving Controller . . . . . . . . . . . . . . . . . . . . 67
Back Up and Restore a Password-Protected Controller. . . . . . . . . . . . . . . . . . . . . . . . 68
Configure Controller Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Recover from a Lost Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Chapter 8
Using the Micro800 Remote LCD Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
USB Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Text Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Startup Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Navigate the Remote LCD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Main Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
User-defined Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Backup and Restore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
ASCII Code for Special Characters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Chapter 9
Using microSD Cards Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Project Backup and Restore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Backup and Restore Directory Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Power-up Settings in ConfigMeFirst.txt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
General Configuration Rules in ConfigMeFirst.txt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
ConfigMeFirst.txt Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Deliver Project Updates to Customers Through Email . . . . . . . . . . . . . . . . . . . . . . . . . 83
Datalog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Datalog Directory Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Datalog Function (DLG) Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Recipe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

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Recipe Directory Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Recipe Function (RCP) Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Quick Start Projects for Datalog and Recipe Function Blocks . . . . . . . . . . . . . . . . . . . . . . . 93
Use the Recipe Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Appendix A
Modbus Mapping for Micro800
Controllers
Modbus Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Endian Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Mapping Address Space and supported Data Types . . . . . . . . . . . . . . . . . . . . . . . . . 103
Example 1, PanelView Component HMI (Master) to Micro800 (Slave) . . . . . . . . . . . . . 104
Example 2, Micro800 (Master) to PowerFlex 4M Drive (Slave) . . . . . . . . . . . . . . . . . . 105
Performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Appendix B
Troubleshooting Status Indicators on the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Fault Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Corrective Action for Recoverable and Non-recoverable Faults . . . . . . . . . . . . . . . . 115
Retrieve a Fault Log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Controller Error Recovery Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Calling Rockwell Automation for Assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Appendix C
Quick Starts Update Your Micro800 Controller Firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Firmware Update From microSD Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Establish Communications between RSLinx and a Micro820 Controller Through USB . . . 121
Configure Controller Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Set Controller Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Change Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Clear Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Forcing I/Os . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Checking if Forces (locks) are Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
I/O Forces After a Power Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Using Run Mode Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Create the Project. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Edit the Project Using Run Mode Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Appendix D
PID Function Blocks PID Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
IPIDCONTROLLER Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
How to Auto Tune. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
How Auto Tune Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Troubleshooting an Auto Tune Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
PID Application Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 7
Preface
About This Publication Use this manual if you are responsible for designing, installing, programming, or troubleshooting
control systems that use Micro800™ controllers.
This manual is a reference guide for Micro820® controllers. It describes the procedures you use to
install, wire, and troubleshoot your controller. This manual:
• Explains how to install and wire your controllers.
• Gives you an overview of the Micro800 controller system.
See the Online Help provided with Connected Components Workbench™ software for more
information on programming your Micro800 controller.
You should have a basic understanding of electrical circuitry and familiarity with relay logic. If you
do not, obtain the proper training before using this product.
Conformal Coated Catalogs Catalog numbers with the suffix ‘K’ are conformal coated and their specifications are the same as
non-conformal coated catalogs.
Download Firmware, AOP,
EDS, and Other Files
Download firmware, associated files (such as AOP, EDS, and DTM), and access product release
notes from the Product Compatibility and Download Center at rok.auto/pcdc.
Summary of Changes This publication contains the following new or updated information. This list includes substantive
updates only and is not intended to reflect all changes.
Additional Resources These documents contain additional information concerning related products from Rockwell
Automation. You can view or download publications at rok.auto/literature.
Topic Page
Updated template throughout
Added statement on inclusive language Important User
Information
Added Daylight Saving section 22
Added Operation Mode section 65
Additional Resources
Resource Description
Micro800 Programmable Controller Family Selection Guide,
publication 2080-SG001 Provides information to help you select the Micro800 controller, plug-ins, expansion I/O, and
accessories, based on your requirements.
Micro800 Programmable Controllers Technical Data, publication 2080-TD001 Provides detailed specifications for Micro800 controllers, expansion I/O modules, plug-in
modules, and accessories.
Micro800 Plug-in Modules User Manual, publication 2080-UM004 Provides information on features, configuration, installation, wiring, and specifications for the
Micro800 plug-in modules.
Micro800 Programmable Controllers General Instructions Reference Manual,
publication 2080-RM001 Provides nformation on instruction sets for developing programs for use in Micro800 control
systems.
Micro800 Programmable Controllers: Getting Started with CIP Client Messaging
Quick Start, publication 2080-QS002 Provides quick start instructions for using CIP GENERIC and CIP Symbolic Messaging.
Micro800 Programmable Controllers: Getting Started with PanelView Plus Quick
Start, publication 2080-QS003 Provides quick start instructions for using global variables for Micro800 controllers together with
PanelView™ Plus HMI terminals.
Configuring Micro800 Controllers on FactoryTalk Linx Gateway Quick Start,
publication 2080-QS005 Provides quick start instructions for configuring a Micro800 controller on FactoryTalk Linx
Gateway.
Micro800 Programmable Controllers Installation Instructions,
publication 2080-IN013 Provides information on mounting and wiring Micro800 Controllers.
Micro800 RS-232/RS-485 Isolated Serial Port Plug-in Module Wiring Diagrams,
publication 2080-WD002 Provides nformation on mounting and wiring the Micro800 RS-232/485 Isolated Serial Port Plug-
in Module.
Micro800 Non-isolated Unipolar Analog Input Plug-in Module Wiring Diagrams,
publication 2080-WD003 Information on mounting and wiring the Micro800 Non-isolated Unipolar Analog Input Plug-in
Module.

8Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Preface
You can download the latest version of Connected Components Workbench software for your
Micro800 controller at rok.auto/ccw.
Micro800 Non-isolated Unipolar Analog Output Plug-in Module Wiring Diagrams,
publication 2080-WD004 Information on mounting and wiring the Micro800 Non-isolated Unipolar Analog Output Plug-in Module.
Micro800 Non-isolated RTD Plug-in Module Wiring Diagrams,
publication 2080-WD005 Provides information on mounting and wiring the Micro800 Non-isolated RTD Plug-in Module.
Micro800 Non-isolated Thermocouple Plug-in Module Wiring Diagrams,
publication 2080-WD006 Provides information on mounting and wiring the Micro800 Non-isolated Thermocouple Plug-in
Module.
Micro800 Remote LCD Installation instructions, publication 2080-IN010 Provides information on mounting and wiring the Micro800 remote LCD module.
Micro800 6-Channel Trimpot Analog Input Plug-In Module Wiring Diagrams,
publication 2080-WD008 Provides information on mounting and wiring the Micro800 6-Channel Trimpot Analog Input Plug-
In Module.
Micro800 Digital Relay Output Plug-in Module Wiring Diagrams,
publication 2080-WD010 Provides information on mounting and wiring the Micro800 Digital Relay Output Plug-in Module.
Micro800 Digital Input, Output, and Combination Plug-in Modules Wiring
Diagrams, publication 2080-WD011 Provides information on mounting and wiring the Micro800 Digital Input, Output, and Combination
Plug-in Modules.
Micro800 High Speed Counter Plug-in Module Wiring Diagrams,
publication 2080-WD012 Provides information on mounting and wiring the High Speed Counter Plug-in module.
Micro800 DeviceNet Plug-in Module Wiring Diagrams, publication 2080-WD013 Provides information on mounting and wiring the Micro800 DeviceNet plug-in module.
EtherNet/IP Network Devices User Manual, publication ENET-UM006 Describes how to configure and use EtherNet/IP devices to communicate on the EtherNet/IP
network.
Ethernet Reference Manual, publication ENET-RM002 Describes basic Ethernet concepts, infrastructure components, and infrastructure features.
System Security Design Guidelines Reference Manual, publication SECURE-RM001 Provides guidance on how to conduct security assessments, implement Rockwell Automation products in a secure system, harden the control system, manage user access, and dispose of
equipment.
UL Standards Listing for Industrial Control Products, publication CMPNTS-SR002 Assists original equipment manufacturers (OEMs) with construction of panels, to help ensure that
they conform to the requirements of Underwriters Laboratories.
American Standards, Configurations, and Ratings: Introduction to Motor Circuit
Design, publication IC-AT001 Provides an overview of American motor circuit design based on methods that are outlined in the
NEC.
Industrial Components Preventive Maintenance, Enclosures, and Contact Ratings
Specifications, publication IC-TD002 Provides a quick reference tool for Allen-Bradley industrial automation controls and assemblies.
Safety Guidelines for the Application, Installation, and Maintenance of Solid-state
Control, publication SGI-1.1
Designed to harmonize with NEMA Standards Publication No. ICS 1.1-1987 and provides general
guidelines for the application, installation, and maintenance of solid-state control in the form of
individual devices or packaged assemblies incorporating solid-state components.
Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1 Provides general guidelines for installing a Rockwell Automation industrial system.
Product Selection and Configuration webpage, rok.auto/systemtools Helps configure complete, valid catalog numbers and build complete quotes based on detailed
product information.
Product Certifications website, rok.auto/certifications Provides declarations of conformity, certificates, and other certification details.
Additional Resources (Continued)
Resource Description

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 9
Chapter 1
Hardware Overview
This chapter provides an overview of the Micro820 hardware features.
Hardware Features Micro820 controllers are 20-point economical brick style controllers with embedded inputs and
outputs. These controllers can accommodate up to two plug-in modules and can connect to a
remote LCD (2080-REMLCD) for configuring. The Micro820 controller also has a microSD™ card slot
for project backup and restore, and datalog and recipe. Only Allen-Bradley® microSD cards,
2080-SD-2GB are supported.
For information on the REMLCD module, see Using the Micro800 Remote LCD on page 69.
The controller also accommodates any class 2 rated 24V DC output power supply that meets
minimum specifications such as the optional Micro800 power supply.
IMPORTANT The Micro820 controller supports all Micro800 plug-in modules, except for
2080-MEMBAK-RTC and 2080-MEMBAK-RTC2.
For more information, see the Micro800 Plug-in Modules User Manual,
publication 2080-UM004.

10 Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Chapter 1 Hardware Overview
Micro820 Controllers
Status Indicators
11
12
13
10
9
5
4
6
2
3
1
87
Micro820 Controller Description
Description Description
1 Optional power supply slot 8 Mounting feet
2 Plug-in latch 9 RJ45 Ethernet connector port
3 Mounting screw hole 10 Power supply
4 40-pin high-speed plug-in connector slot 11 Status indicators
5 microSD (Micro Secure Digital) card slot 12 RS-232/RS-485 non-isolated combo Serial ports
6 Removable/fixed terminal blocks 13 Removable/fixed terminal blocks
7 DIN rail mounting latch
Micro820 Controller Status Indicator Description(1)
(1) For detailed description of the different status indicators, see Troubleshooting on page 109.
Description Description
1 Input status 5 Fault status
2 Run status 6 Comm status
3 Force status 7 SD status
4 ENET status 8 Output status
ATTENTION: Removable terminal blocks are available on catalog numbers that
end in R (for example, 2080-LC20-20QBBR). Fixed terminal blocks are available on
catalog numbers that do not end in R (for example, 2080-LC20-20QBB).
You can order a replacement terminal block, catalog number 2080-RPL24RTB,
separately.
1
25
36
47
8

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 11
Chapter 1 Hardware Overview
Inputs and Outputs
Embedded microSD Card Slot
Micro820 controllers support Micro Secure Digital (microSD) cards through an embedded microSD
card slot. The design supports Class 6 and 10 SDSC and SDHC microSD cards, with FAT32/16
formats. The microSD file system supports only one file partition. Only Allen-Bradley microSD cards,
2080-SD-2GB are supported.
The microSD card is primarily used for project backup and restore, as well as datalog and recipe
functions. It can also be used to configure power-up settings (such as controller mode, IP address,
and so on) through an optional ConfigMeFirst.txt file.
For more information, see Using microSD Cards on page 79.
To help you troubleshoot microSD card-related errors, see Troubleshooting on page 109.
Embedded RS-232/RS-485 Serial Port Combo
The Micro820 controller supports an embedded non-isolated RS-232/RS-485 combo
communications port. Only one port (RS-232 or RS-485) can work at any given time. The
communication rate of this port supports up to 38.4 K.
The communication port uses a 6-pin 3.5 mm terminal block with pin definition shown in Table 2.
Table 1 - Micro820 Controllers – Number and Types of Inputs/Outputs
Catalog Number
Inputs Outputs Analog Out
0…10V DC
Analog In
0…10V (shared with DC In) PWM Support
120V AC 120/240V AC 24V DC Relay 24V DC
Source
24V DC
Sink
2080-LC20-20AWB 8 – 4 7 – – 1 4 –
2080-LC20-20AWBR 8 – 4 7 – 1 4 –
2080-LC20-20QWB – – 12 7 – – 1 4 –
2080-LC20-20QWBR – – 12 7 – – 1 4 –
2080-LC20-20QBB – – 12 7 – 1 4 1
2080-LC20-20QBBR – – 12 – 7 – 1 4 1
WARNING: The microSD card slot only supports Allen-Bradley microSD card 2080-
SD-2GB. Other microSD cards may not work and are not recommended.
IMPORTANT Serial port cables should not exceed 3 m (9.84 ft.) length.
Table 2 - RS-232/RS-485 Serial Port Pin Definition
Pin Definition RS-485 Example RS-232 Example
1 RS-485+ RS-485+ (not used)
2 RS-485- RS-485- (not used)
3 GND GND GND
4 RS-232 input (receiver) (not used) RxD
5 RS-232 output (driver) (not used) TxD
6 GND GND GND
D-
D+ G
Rx
Tx
123456
G

12 Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Chapter 1 Hardware Overview
The communication port (both RS-232 and RS-485) are non-isolated. The signal ground of the port
is not isolated to the logic ground of the controller.
The RS-232 port supports connection to the Micro800 Remote LCD module (2080-REMLCD).
Embedded Ethernet Support
A 10/100 Base-T Port is available for connection to an Ethernet network through any standard RJ45
Ethernet cable.
RS-485
Ethernet port pin-to-pin connection
For descriptions of the ENET status indicator, see Troubleshooting on page 109.
REMLCD to Micro820 Serial Port Terminal Block Wiring
REMLCD Serial Port
Terminal Block
Micro820 Serial Port
Terminal Block
Signal Pin number Pin number Signal
RS-232 TX 1 <--------> 4 RX RS-232
RS-232 RX 2 <--------> 5 TX RS-232
RS-232 G 3 <--------> 6 G RS-232
RJ45 connector
RJ45 Ethernet Port Pin Mapping
Contact
Number Signal Direction Primary Function
1 TX+ OUT Transmit data +
2 TX- OUT Transmit data -
3 RX+ IN Receive data +
4–––
5–––
6 RX- IN Receive data -
7–––
8–––
1
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
white-orange
orange
white-green
blue
white-blue
green
white-brown
brown
white-orange
orange
white-green
blue
white-blue
green
white-brown
brown

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 13
Chapter 2
About Your Controller
Programming Software for
Micro800 Controllers
Connected Components Workbench software is a set of collaborative tools supporting Micro800
controllers. It is based on Rockwell Automation and Microsoft® Visual Studio® technology and offers
controller programming, device configuration and integration with HMI editor. Use this software to
program your controllers, configure your devices and design your operator interface applications.
Connected Components Workbench software provides a choice of IEC 61131-3 programming
languages (ladder diagram, function block diagram, structured text) with user-defined function
block (UDFB) support that optimizes machine control.
Obtain Connected Components Workbench Software
There are two editions for the Connected Components Workbench software:
• You can download Connected Components Workbench Standard Edition software for
free at rok.auto/pcdc.
• To purchase Connected Components Workbench Developer Edition software,
visit rok.auto/ccw.
Use Connected Components Workbench Software
To help you program your controller through the Connected Components Workbench software, you
can see the Connected Components Workbench Online Help that comes with the software.
Controller Changes in Run
Mode
Micro820 controllers allow you to make certain changes while in Run mode by using the following
features:
• Run Mode Change (RMC)
Allows logic modifications to a running project without going to Remote Program mode.
For more information, see Using Run Mode Change (RMC) on page 13.
• Run Mode Configuration Change (RMCC)
Allows changing the address configuration of the controller to be made within a program
during run mode.
For more information, see Using Run Mode Configuration Change (RMCC) on page 17.
Using Run Mode Change
(RMC)
Run Mode Change (RMC) is a productivity enhancement feature introduced in software version 8 for
Micro820 controllers. The feature saves the user time by allowing logic modifications to a running
project without going to remote program mode and without disconnecting from the controller. You
must use the Connected Components Workbench Developer Edition software version 8 software, or
later, to use this feature.
RMC is useful during project development, when you add small changes incrementally to the logic
and want to see the effects of the changes on the machine immediately. With RMC, since the
controller stays in Remote Run mode, the controller logic and machine actuators do not have to
reinitialize constantly, which can occur if the controller is switched to Remote Program mode (for
example, the first scan bit is checked in the program logic to clear outputs).
IMPORTANT You must use Micro820 controller firmware revision 8.xxx or later to use Run
Mode Change.

14 Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Chapter 2 About Your Controller
When you edit, build, and download a project without using RMC, a full build of the entire controller
project is performed and a full download of the project is performed. During RMC an incremental
build is performed and only incremental changes are downloaded to the controller.
RMC is performed incrementally at the end of every program scan in order to prevent a large delay
in the program scan. This adds up to an additional 12 ms to the scan time. For example, if the
program scan is normally 10 ms, it may increase to 22 ms during RMC until the update is finished.
Similarly user interrupts may be delayed.
A new global variable __SYSVA_PROJ_INCOMPLETE is added to indicate when Run Mode Changes
are being made. Use the variable to notify you on the HMI that there are uncommitted changes in
the controller.
When you perform a Test Logic Change, the value of the variable changes from zero to one. After
you choose to accept or undo the changes, the value of the variable resets to zero.
IMPORTANT Do not disconnect from the controller after you perform Run Mode Change,
do a full build, and then try to reconnect. Connected Components
Workbench software treats the project in the controller as different from
the project in Connected Components Workbench software, even though
the logic is identical, and asks to either upload or download the project.
Table 3 - Example of the Benefits of Using RMC – 20% Reduction in Download Time
Number of
Changes
Time to Perform Conventional Download
(seconds)
Time to Test Logic and Accept Changes
(seconds)
136 29
5180 130
10 360 255
Memory size of project used for comparison:
Data = 14,784 bytes; Program = 2,352 bytes
Note: The duration starts when the RMC button is clicked while connected to the controller and ends when the accept is
finished. For example:
1. When connected to the controller, select RMC.
2. Modify the program.
3. Select Test Logic.
4. Select Accept to finish, or select Test Logic to make another change.
ATTENTION: Use extreme caution when you use Run Mode Change. Mistakes can
injure personnel and damage equipment. Before using Run Mode Change:
• Assess how machinery will respond to the changes.
• Notify all personnel about the changes.
Table 4 - Bit Definitions of Global Variable – __SYSVA_PROJ_INCOMPLETE
Bit Definition
0
Set when the Run Mode Change process starts.
Clears once the Run Mode Change is written permanently to the controller (completion of Accept or
Undo).
Use the bit to warn you that a Run Mode Change is in progress and that there are uncommitted
changes in the controller.
1Set if an error occurs while saving the changes to flash memory or if an integrity check fails during Run Mode Change.
Clears on the next successful Run Mode Change.
IMPORTANT When you perform a Test Logic is performed, or undo changes after the
Test Logic is completed, any active communication instructions are
aborted while the changes download to the controller.

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 15
Chapter 2 About Your Controller
Uncommitted Changes
Uncommitted changes are changes that are made in RMC that have not been accepted or are
undone after a Test Logic Change is performed.
If the controller power loses power while there are uncommitted changes, you cannot reenter RMC
upon reconnection. You can choose to download the project again to keep the changes, or upload
to discard the uncommitted changes.
If you choose to upload a project with uncommitted changes from the controller, you cannot enter
RMC until you have performed a full download.
RMC Memory
Use Run Mode Change (RMC) memory to store both the logic and user variable changes made
during RMC. The default amount of memory allocated is 2 KB and you can increased it up to 8 KB.
However there is still a limit of 2 KB for logic and user variables changes per Test Logic. To adjust
the amount of RMC memory, the controller must be offline. After you have adjusted the amount, you
must build the project and download it to the controller.
Figure 1 - Controller Memory Diagnostics Page in Connected Components Workbench Software
During RMC an incremental build is performed and only incremental changes are downloaded to
the controller until the RMC memory is filled.
Figure 2 - RMC Memory Usage Example
IMPORTANT In a Connected Components Workbench software version 8 project, the
available user data space is reduced by 6 KB to support optimal project
settings for the new RMC feature.
If you have a project that is developed before software version 8, you may
need to reduce the default “Allocated” 8 KB Temporary Variables section
from the Memory page in order to compile the project successfully.
Controller Memory
(for User Program + Data)
RMC Memory
(Default size = 2KB)
Used memory
Free memory
Used RMC memory
Free RMC memory
First change
and Test Logic
(Add logic)
Second change
and Test Logic
(Remove logic)
Third change
and Test Logic
(Add logic)

16 Rockwell Automation Publication 2080-UM005G-EN-E - December 2023
Chapter 2 About Your Controller
If insufficient RMC memory is available to make more changes (for example, a “not enough
memory” error message appears during the RMC build or Test Logic), then you must perform a full
download to transfer the incremental changes from the RMC memory to the standard user program
and data memory.
Transfer Contents in RMC Memory to Controller Memory
The changes that you made during RMC are stored in the RMC memory and remain there until you
perform a full build and download (while the controller is disconnected).
Figure 3 - RMC Memory Usage When Performing Full Build and Download Example
However, if the controller memory has insufficient space remaining to copy the contents of the RMC
memory as shown in Figure 4, the operation will fail and a “not enough memory” error message will
appear. Do not use RMC if you are near the limits of your controller memory.
Figure 4 - Insufficient Controller Memory Example
Limitations of RMC
Take note of the following limitations when using the Run Mode Change (RMC) feature:
• You cannot make configuration changes (for example, change filter times).
• You can add up to 2 KB of logic (approximately 150 boolean instructions) and user variables
for each Test Logic.
• You can increase the total memory allocated for RMC (cumulative of all Test Logic Changes)
from 2 KB to 8 KB, but the 2 KB limit for logic and user variables per Test Logic remains.
• You can add a total of 20 Program Organizational Units (POU) for each RMC (for example, if
you currently have 5 POU, you can add 20 more for a total of 25 POU).
• If you modify a user defined function block (UDFB) that changes the local variables, the local
variables are reinitialized or reset to zero and a warning message shows during the build. If
you want to reapply the initial value, right-click on the UDFB and select
Refactor > Reset Initial Values of Instances.
• RMC is not possible after you perform a Discover Project operation, if a new module is
detected, because the configuration has changed.
• You cannot import exchange files when in RMC because an import is considered a
configuration change.
Controller Memory
(for User Program + Data)
RMC Memory
(Default size = 2KB)
New used memory
Free memory Free RMC memory
Used RMC memory is copied
to controller memory
Controller Memory
(for User Program + Data)
RMC Memory
(Default size = 2KB)
Error occurs due to insufficient
remaining controller memory
Free RMC memory
Used memory

Rockwell Automation Publication 2080-UM005G-EN-E - December 2023 17
Chapter 2 About Your Controller
• If you make changes to the display configuration (for example, hiding comments), they are
treated as logic changes and you must build the project.
• You can add global variables in RMC, but you cannot delete or modify them. To delete or
modify a global variable, you must disconnect the controller from the Connected
Components Workbench software.
• If you create a global variable in RMC, it does not show in the LCD display.
• When using Common Industrial Protocol (CIP™) messaging in RMC, setting the CIPTARGETCFG
data type parameter ConnClose to TRUE has no effect. The Ethernet session does not close
immediately upon successful messaging and you have to wait for the connection to timeout
after 60 seconds. This behavior applies to Connected Components Workbench software
version 9 or earlier projects. For version 10 or later projects you can configure the CIP
connection timeout.
For an example of how to use this feature, see Using Run Mode Change on page 129.
Using Run Mode
Configuration Change
(RMCC)
Run Mode Configuration Change (RMCC) is a productivity enhancement feature that is supported in
Connected Components Workbench software for Micro820 controllers. It allows you to reuse an
identical program with multiple controllers by changing the address configuration of a controller
within the program during run mode. You must have Micro820 controller firmware revision 9.011 or
later to use this feature.
You can use RMCC to change the address configuration of the controller during run mode, when
you set the communication protocol to Modbus RTU for the Serial ports, or EtherNet/IP™ for the
Ethernet port. RMCC uses a CIP Generic message, which you can only send from within a controller
program and not from an external device to the controller.
Figure 5 - CIP Generic Message Instruction for Run Mode Configuration Change
Only the controller that is sending the message can perform RMCC. To perform RMCC, you must
configure the CIP Generic message as a loop-back message by setting the path to “0,0”.
Figure 6 - Configure CIP Generic Message as a Loop-back Message
WARNING: If you delete the output rung when in Run Mode Change and accept the
changes, the output on the controller will remain ON.

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Chapter 2 About Your Controller
For Micro820 controllers, the address configuration change is not permanent and is lost when the
controller is power cycled (for firmware revision 9 or earlier). If you want the address to change
immediately after a power cycle, you must perform this CIP Generic message after every power up.
You can do this by doing the following:
• Use the system variable __SYSVA_POWER_UP_BIT.
• Set the Retained flag for the variable containing the new address.
From firmware revision 10 or later, Micro820 controllers now retains the address configuration
when you cycle power to the controller.
Figure 7 - Set Retained Flag – Modbus Address

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Chapter 2 About Your Controller
Figure 8 - Set Retained Flag – EtherNet/IP Address
Using Modbus RTU Communication
To use RMCC with the Modbus RTU communication protocol, you must set the Serial port to the
Modbus slave role. A CIP Generic message is sent from within a program with the following
parameters.
Figure 9 - RMCC Modbus Example – Set the Parameters
Table 5 - CIP Generic Message Parameters for RMCC using Modbus RTU
Parameter Value
Service 16
Class 70
Instance 2 – Embedded Serial port
5, 6, 7, 8, or 9 – Plug-in modules
Attribute 100
ReqData New node address, 1
ReqLen 2

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Chapter 2 About Your Controller
Figure 10 - RMCC Modbus Example – Set the New Node Address
The first byte indicates the new node address for the controller. For this example, the new node
address is “3”. The second byte must always be “1”, this indicates that the Modbus role is
configured as Slave.
Figure 11 - RMCC Modbus Example – Set the Message Length
When the new node address is configured and applied, the port is not restarted.
You can verify that the node address has changed after performing RMCC by examining the
Communication Diagnostics tab for the controller.
Figure 12 - RMCC Modbus Example – Verify Address Change
Using EtherNet/IP Communication
To use RMCC with the EtherNet/IP communication protocol, you must configure the controller to use
a static IP address. If you configure the controller to use BOOTP or DHCP, the change is rejected. A
CIP Generic message is sent from within a program with the following parameters.
IMPORTANT You must ensure that the new node address being configured is unique as
it will not be checked against existing node addresses of other devices.