Rockwell Automation Allen-Bradley SynchLink 1756-DM Series Design Manual page 108

Glossary 8
Publication 1756-TD008A-EN-P - August 2002
Time relay
A device that is configured to pass a time reference between a
ControlLogix chassis backplane and a SynchLink fiber.
Time slave
A device (e.g. SynchLink module) that is configured to receive the
time reference from the CST Time Master (located in a ControlLogix
chassis) or upstream node in a SynchLink system.
Timestamp
A ControlLogix process that stamps a change in input data with a time
reference of when the change occurred.
Topology
The physical arrangement of SynchLink nodes. Each arrangement is
designed to best fit particular SynchLink applications. The following
topologies are available in SynchLink.
· Star Topology
· Daisy Chain Topology
· Ring Topology
Transmit port communications format
The communications format used in a ControlLogix SynchLink module
for all data the module transmits on its fiber optic transmit port.
V-Scan
The Drive module performs a V-Scan every 500 m S. During the V-Scan,
the module updates the parameters linked to the transmit words, and
reads the receive words linked to control parameters. After each
V-Scan the module performs nine SynchLink updates.