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Publication 1756-TD008A-EN-P - August 2002
Transmitted Direct Words
The devices that operate on SynchLink can be configured to transmit
data from the following direct word sources:
· Output Direct Words (0-3) - The local host (e.g. ControlLogix
controller) passes these words to the 1756-SYNCH module in its
local chassis. The module then transmits the data to the
SynchLink fiber.
· Received Direct Words (0-3) - The 1756-SYNCH receives these
words from the SynchLink fiber and copies the data back onto
the fiber (via its transmit port) without any local host controller
interaction with the data.
· Multiplier - This is the product of an upstream direct word and a
user-configured multiplier for re-transmission to a downstream
node. A typical application for this function would be for real
time drawing applications where section-to-section speed ratios
are required for precise process control.
Direct Words
Direct words are data delivered in a single message. These can be
read from the module input data and sent to the module output data.
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 a daisy chain or ring
configuration if necessary.
Multiplier
The Multiplier feature multiplies one Direct Word on the receive port
by a user-defined value (0.5 to 2.0) before transmitting it out the
transmit port. This feature is used to manipulate specific data from
node to node. This feature is set during configuration. For the
1756-SYNCH module, you must configure the Multiplier in RSLogix
5000. For the 1756-DMxxx series modules and the PowerFlex 700S
drives, you must set this feature in DriveExecutive in the DriveTools
2000 suite.
A drawing application might use the Multiplier to
EXAMPLE
modify data from section to section throughout the
process.
Although you can configure the multiplier for any of the Direct Words,
it can only be used with one Direct Word at a time.
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