Rockwell Automation Allen-Bradley SynchLink 1756-DM Series Design Manual page 107

SynchLink
A unidirectional fiber optic communications link that provides time
synchronization and data broadcasting. These functions are used for
distributed motion and coordinated drive control systems based on
ControlLogix and PowerFlex 700S products.
SynchLink Fiber Optic Cable System
A fiber optic cable system consisting of cable segments and
(depending on topology), hubs, or bypass switches.
SynchLink Node
A device that operates on the SynchLink for time synchronization
and/or high speed data transfer, including:
· 1756-SYNCH module
· 1756-DMD30 & 1756-DMF30 modules
· PowerFlex 700S drive
SynchLink Node Clock
A base-line requirement of any product incorporating SynchLink and
integral to all devices that contain SynchLink circuitry. The SynchLink
node clock has a 1 m S resolution and serves as the system clocking
mechanism.
SynchLink System
A control system consisting of a set of nodes connected via a fiber
optic cable system.
SynchLink Update
Each SynchLink Update takes 50 m S. During each SynchLink Update,
the module transmits all direct words once, and one or two buffered
words, depending on the communications format.
Synchronize
A process where multiple devices operate at the same time or
maintain a matching time reference.
Time master
A device (e.g. SynchLink module) that is configured to establish the
time reference for a ControlLogix chassis or SynchLink system.
Glossary
Publication 1756-TD008A-EN-P - August 2002
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