Rockwell Automation 20-COMM-R Remote I/O Adapter - Manual (Page 58)

4-22 Using Discrete and Block Transfer I/O
20-COMM-R Remote I/O Adapter User Manual
Publication 20COMM-UM004D-EN-P
Figure 4.15 SLC 500 Example Ladder Logic for Block Transfer I/O Read
See Figure 4.3 for the Block Transfer I/O image.
This rung executes once each time the SLC is switched into RUN mode. It resets any BTR control bits that might be set in the RIO
scanner.
0000
S:1
15
First Pass
MOV
Move
Source
128
128 <
Dest N11:0
-32640 <
MOV
COP
Copy File
Source
#N11:0
Dest #M0:1.200
Length 28
COP
This rung transfers the Block Transfer Read (BTR) status buffer from the RIO scanner to the memory in the SLC. When the BTR is
complete, the data in this file will indicate if the BTR was successful or not. This file will also contain the I/O data from the drive.
N11:110 = Feedback
N11:112 = Datalink A1
N11:114 = Datalink A2
0001
COP
Copy File
Source
#M1:1.200
Dest #N11:100
Length 28
COP
This rung enables the BTR on the first pass through the program and re-enables it each time the BTR is completed or errors.
0002
N11:100
13
I/O BTR DN (Done)
N11:100
12
I/O BTR ER (Error)
S:1
15
First Pass
N11:0
15
I/O BTR EN (Enable)
This rung transfers the BTR information to the RIO scanner for execution.
0003
COP
Copy File
Source
#N11:0
Dest #M0:1.200
Length 28
COP
0004 END