Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 150)

Publication 1747-UM010B-EN-P - September 2003
9-8 Programming Techniques
Program File 4
0000
MOV
Move
Source
M0:1.3410
?<
Dest
B3:5
0000000000000000<
MOV
MOV
Move
Source
#M1:1.3410
?<
Dest
#B3:6
0000000000000010<
MOV
0001
B3:5
0
B3:6
0
COP
Copy File
Source
#N12:0
Dest #M0:1.3500
Length
128
COP
L
B3:7
0
0002
B3:6
0
U
B3:7
0
0003
B3:5
1
B3:6
1
COP
Copy File
Source #N12:128
Dest
#M0:1.3628
Length 128
COP
L
B3:7
1
0004
B3:6
1
U
B3:7
1
The following six rungs are meant to be executed only when this processor/1747-BSN is in the Primary mode. When the 1747-BSN is acting as
the primary processor, this rung copies the DTCW and DTSW words to internal storage (B3:5 and B3:6 respectively) within the SLC processor.
Virtual and Actual DTCW Words
Virtual and Actual DTSW Words
Virtual DTCW Bit for Data Block #1 Virtual DTHW Bit for Data Block #1
Unlatch the virtual DTCW bit for Data Block #1 when the comparable virtual DTSW bit is set by the 1747-BSN module to indicate that it has
received the last data via Data Block #1. When B3:7/0 has been unlatched, the module is ready for the next data transfer via Data Block #1.
Virtual DTCW Bit for Data Block #1
Virtual DTSW Bit
for Data Block #2
Virtual DTHW Bit
for Data Block #2
This rung monitors the DTCW and DTSW bits for Data Block #2. When a transfer of data using Data Block #2 is not in progress, copy up
to 128 words to the appropriate M-file location for Data Block #2 in the 1747-BSN module.
Virtual DTCW Bit for Data Block #2
Virtual DTCW Bit for Data Block #2 Virtual DTHW Bit for Data Block #2
Unlatch the virtual DTCW bit for Data Block #2 when the comparable virtual DTSW bit is set by the 1747-BSN module to indicate that it has
received the last data via Data Block #2. When B3:7/1 has been unlatched, the module is ready for the next data transfer via Data Block #2.
This rung monitors the DTCW and DTSW bits for Data Block #1. When a transfer of data using Data Block #1 is not in progress, copy up to
128 words to the appropriate M-file location for Data Block #1 in the 1747-BSN module.
Virtual DTSW Bit
for Data Block #1
Virtual DTHW Bit
for Data Block #1