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CST/SynchLink Time Relay
A time relay is any device that passes a time reference along. The
1756-SYNCH module passes the CST reference in the master chassis
from the chassis backplane to the fiber optic media. Slave nodes in
other chassis receive the CST reference value from the media, and
relay the value to their respective backplanes. In this manner,
although the SynchLink modules in the slave chassis are configured as
slaves on the SynchLink fiber, they are configured as masters in their
chassis, establishing the received CST value as the master reference
for that chassis. Thus, all chassis that use the 1756-SYNCH module can
be synchronized to the same CST reference.
Axis Support
The 1756-SYNCH module can transmit and receive axis data types that
are used in the motion engine (of the local controller) to produce
motion profiles. Since the motion planner uses the CST clock as its
main time reference, all devices that consume motion axis data
information from a motion master must also use the same time
reference to interpolate the motion data in a meaningful way. This is
true both inside a single chassis as well as among a distributed system
where multiple chassis are using the same data.
Keep in mind that a 1756-SYNCH module should
IMPORTANT
never follow a PowerFlex 700S drive in any
SynchLink configuration.
1756-DMxxx Drive Modules
SynchLink Node Clock
The 1756-DMxxx drive modules employ the SynchLink node clock,
allowing the modules to be the SynchLink time master or a SynchLink
time slave; in this way, the module can either set time on the fiber, or,
receive time from the fiber. The 1756-DMxxx drive modules also
implement the VPLs used in the PowerFlex 700S drives.
Publication 1756-TD008A-EN-P - August 2002
4-3
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