Rockwell Automation 1756-SYNCH ControlLogix SynchLink Module User Manual - Manual (Page 11)

1 Publication 1756-UM521C-EN-P - July 2004
Table of Contents
Chapter 1
What is the 1756-SYNCH module? What is the ControlLogix SynchLink Module?. . . . . . . . . . . . . . . . . . 1-1
What Data Does the SynchLink Module Transfer? . . . . . . . . . . . 1-1
Why Synchronize Time Between Chassis? . . . . . . . . . . . . . . . . . . 1-2
What Are Some of the Features Available On the
ControlLogix SynchLink Module? . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Connecting a SynchLink Module to a SynchLink System . . . . . . . . . 1-3
Physical Features of the ControlLogix SynchLink Module . . . . . 1-4
Using Module Identification and Status Information. . . . . . . . . . . . . 1-5
Preventing Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Removal and Insertion Under Power . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Chapter Summary and What’s Next . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Chapter 2
Time Synchronization in the
ControlLogix System Using the Coordinated System Time (CST) . . . . . . . . . . . . . . . . . . . . 2-2
Time Synchronization in a Distributed Control System . . . . . . . . . . 2-2
Time Synchronization in the SynchLink System . . . . . . . . . . . . . . . . 2-2
SynchLink Node Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
How Do the CST Clock and SynchLink Node Clock
Work Together? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Configuring Time Mastership Functionality . . . . . . . . . . . . . . . . . . . . 2-5
What are the SynchLink Configurations? . . . . . . . . . . . . . . . . . . . . . . 2-6
Star Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Daisy Chain Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Ring Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Cable Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Chapter Summary and What’s Next . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Chapter 3
SynchLink Module Features Module Features That Cannot Be Configured . . . . . . . . . . . . . . . . . . 3-2
Removal and Insertion Under Power (RIUP) . . . . . . . . . . . . . . . 3-2
Module Fault Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Full RSLogix 5000 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Status Indicator (LED) Information. . . . . . . . . . . . . . . . . . . . . . . 3-4
Class I Division 2 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Agency Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Use Last Configuration When Connection Closes . . . . . . . . . . . 3-5
Module Features That Can Be Configured . . . . . . . . . . . . . . . . . . . . . 3-5
Communications Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Electronic Keying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Requested Packet Interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
SynchLink Transmitted Axes . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Transmitted Direct Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
CST and SynchLink Mastership . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Chapter Summary and What’s Next . . . . . . . . . . . . . . . . . . . . . . . . . 3-20