See figure 4.3 for the block transfer i/o image – Rockwell Automation 20-COMM-R Remote I/O Adapter User Manual

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Using Discrete and Block Transfer I/O

20-COMM-R Remote I/O Adapter User Manual

Publication 20COMM-UM004D-EN-P

Figure 4.10 PLC-5 Example Ladder Logic for Block Transfer I/O (Read/Write)

See

Figure 4.3

for the Block Transfer I/O image.

This run executes an I/O BTR to move status information from the 20-COMM-R to the PLC. Note that this is the minimum logic needed -- a more complex system

may require additional sequencing logic.

0000

BT9:0

BTR

Block Transfer Read

Module Type Generic Block Transfer

Rack

001

Group

Module

Control Block

BT9:0

Data File

N11:0

Length

Continuous

BTR

This run executes an I/O BTW to move status information from the PLC to the 20-COMM-R. Note that this is the minimum logic needed -- a more complex system

may require additional sequencing logic.

0001

BT9:1

BTW

Block Transfer Write

Module Type Generic Block Transfer

Rack

001

Group

Module

Control Block

BT9:1

Data File

N10:0

Length

Continuous

BTW

0002

END

N11:0 = Feedback

N11:2 = Datalink A1 Read

N11:4 = Datalink A2 Read

N10:0 = Feedback

N10:2 = Datalink A1 Write

N10:4 = Datalink A2 Write