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1-6
Direct data is automatically copied from
the receive port to the transmit port
(without host controller
and transferred to the next SynchLink
node.
(1)
The local ControlLogix controller must
move data from one port to another (e.g.
via ladder logic).
Publication 1756-TD008A-EN-P - August 2002
Data Transfer
You can transfer the following types of reference data over SynchLink:
· Produced axis data for chassis to chassis remote axis control -
1756-SYNCH module only
· High speed drive reference data for chassis-to-drive control or
drive-to-drive control
· General control information that requires transfer at a high
speed and in a synchronized manner
For SynchLink and Drive modules, the communications format
(chosen during product configuration) determines what type of data is
transferred between them. The data type transfers are asynchronous
from each other.
SynchLink messages are structured as six 32-bit words; the actual
available amount of data transferred (direct, buffered or axis) is
configured on a module-by-module basis. The words are divided into
three types:
· Direct - Data delivered in a single message. A SynchLink
message can contain a maximum of four direct data words; each
word is 32 bits in length. Direct data can be automatically
forwarded to the next SynchLink node in the daisy chain or ring
configurations, as shown below.
(1)
intervention)
SynchLink Node
Host
controller
Buffered
Buffered
data
data
storage
storage
SynchLink
Receive
Direct data
Transmit
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