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Publication 1756-TD008A-EN-P - August 2002
Transferring Data With the Drive Modules
The Drive modules transfer two types of data:
· 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.
· Buffered - Data that exceeds the four word limit of a direct data
transfer. Buffered data is appropriately segmented at the
transmitting device and reassembled at the receiving device.
Buffered data cannot be automatically forwarded to the next
SynchLink node in the daisy chain and ring configurations.
· Axis data - Not supported by 1756-DMxxx Series modules.
ControlLogix Drive Module Features
The Drive module offers the following features:
· Velocity, position, and torque control
· Control loops are not synchronized to SynchLink through
on-board connections. The 1756-SYNCH module is required to
synchronize the Drive module to SynchLink.
· Motor Control capability for the respective Reliance Electric
Distributed Power drive
· Fiber optic connection to the Power Module Interface
· Time synchronization of the SynchLink node clocks
· Removal and insertion under power (RIUP) - Allows you to
remove and insert the module while power is applied
· Class I Division 2, UL, CSA, and CE Agency Certification
Related Documents
For more information on the ControlLogix Drive modules (1756-DMxx
Series), including a full description of all features and how to
electronically configure the module, see the following publications:
· ControlLogix Drive Modules installation instructions, publication
1756-IN577
· ControlLogix Drive Modules user manual, publication
1756-UM522
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