Rockwell Automation 1771-SDN DeviceNet Scanner Module Installation Instructions User Manual
Page 17
Publication 1771-IN014B-EN-P - September 2001
DeviceNet Scanner Module Catalog Number 1771-SDN/C 17
control files for each of the block transfer instructions when an
integer file is used. This is not necessary when a control block file is
a BT data type.
To make sure the instruction is reset after the block transfer completes
and recycles, you must use enable bits as the conditions on each rung
with the PLC-5. The following figure shows a PLC-5 sample program
.
IMPORTANT
The module does not support continuous mode block
transfer. Set Continuous to NO for each BTW or BTR.
Precondition
EN
BLOCK TRANSFER READ
Rack
Group
Module
Control Block
3
2
0
DN
Data file
Length
N11:0
62
ER
BTR
Continuous
NO
EN
BLOCK TRANSFER WRITE
Rack
Group
Module
Control Block
DN
Data file
Length
ER
BTW
Continuous
Block-transfer rungs must be scanned for the transfers to occur. The
preconditions allow time-driven or event-driven transfers.
Precondition
BTR
enable bit
BTW
enable bit
BTW
enable bit
BTR
enable bit
BT10:0
EN
BT10:5.EN
EN
EN
EN
BT10:0
BT10:0
3
2
0
N11:62
62
NO
BT10:5
BT10:5.EN