Rockwell Automation Allen-Bradley SynchLink 1756-DM Series Design Manual page 102

Glossary 2
Publication 1756-TD008A-EN-P - August 2002
Bypass Switch Block
A block used in the daisy chain and ring configurations to bypass a
node temporarily disconnected from the SynchLink system.
Center node
A node in the SynchLink Daisy Chain or Ring configuration that
receives data and transmits data.
Cladding
A layer of material surrounding the core of a fiber.
Coating
A protective plastic material surrounding the cladding.
Communications format
Format that defines the type of information transferred between an
I/O module and its owner controller. This format also defines the tags
created for each I/O module.
Compatible match
An electronic keying protection mode that requires the physical
module and the module configured in the software to match
according to vendor, catalog number and major revision. In this case,
the minor revision of the module must be greater than or equal to that
of the configured slot.
Connection
The communication mechanism from the controller to another module
in the control system.
Coordinated system time (CST)
Clock that is used in:
· all modules in a single ControlLogix chassis
or
· all ControlLogix chassis in a distributed control system.
The SynchLink system can synchronize this clock value across chassis.