Rockwell-automation 1756-SYNCH ControlLogix SynchLink Module User Manu Manual de usuario descargar pdf (Pagina 37)

Publication 1756-UM521C-EN-P - July 2004

SynchLink Module Features 3-9

The SynchLink module updates its receive and transmit buffers once

every 500μS. Because direct data can be passed through from node to

node once every 50μS, up to 10 nodes can be updated with direct

data in a single 500μS SynchLink scan. Pass-through functionality only

applies to direct data in a daisy chain configuration, though; axis data

and buffered data cannot be passed through. Instead, these data types

require the intervention of the local controller to move data along. For

this reason, it is not recommended that a daisy chain configuration

be used when distributing axis data among multiple axis in a

distributed control system.

For more information on the available Receive Port and Transmit Port

communication formats, see Table 3.4.

Table 3.4 SynchLink Module Receive Communications Formats

Receive Port Communications Format

Transfer Rate (across the fiber optic

cable) for Each Data Type:

1 Axis, 3 Direct Words, 14 Buffered Axis Data - Updated every 500μS

Direct Data - Updated every 50μS

Buffered Data - Updated every 500μS

2 Axis Axis Data - Updated every 250μS

2 Axis, 3 Direct Words Axis Data - Updated every 500μS

Direct Data - Updated every 50μS

2 Direct Words, 18 Buffered Direct Data - Updated every 50μS

Buffered Data - Updated every 250μS

4 Direct Words, 18 Buffered Direct Data - Updated every 50μS

Buffered Data - Updated every 500μS

4 Direct Words, 8 Buffered Direct Data - Updated every 50μS

Buffered Data - Updated every 250μS

No Receive Data No data updated in this format

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 145 146

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Rockwell-automation 1756-SYNCH ControlLogix SynchLink Module User Manu Manual de usuario Pagina 37