Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 107)

Publication 1747-UM010B-EN-P - September 2003
Module Control and Status Word 6-11
Program File 3
0000
MOV
Move
Source
M1:1.3410
?<
Dest
B3:3
0000001001100000<
MOV
0001
B3:3
0
COP
Copy File
Source #M1:2.3500
Dest
#N12:0
Length 128
COP
B3:4
0
0002
B3:3
1
COP
Copy File
Source #M1:2.3628
Dest
#N12:128
Length 128
COP
B3:4
1
0003
MOV
Move
Source
B3:4
0010000001000000<
Dest
M0:1.3411
?<
MOV
0004 END
The following rungs are meant to be executed only when this processor/1747-BSN in the backup mode. When the processor is acting as the
backup processor, this rung copies the Data Table Status Word (DTSW) to an internal storage word (B3:3) within this SLC processor.
Virtual And Actual DTSWs
This rung copies the new Data Block #1 data from the secondary 1747-BSN to a file within the secondary processor. When the copy is
complete, the Data Table Handshake Word (DTHW) for Data Block #1 (B3:4/0 = M0:1.3411/0) must be set to inform the secondary 1747-BSN
that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block #1.
Virtual DTSW Bit For Data Block #1
Virtual DTHW Bit For Data Block #1
This rung copies the new Data Block #2 data from the secondary 1747-BSN to a file within the secondary processor. When the copy is
complete, the Data Table Handshake Word (DTHW) for Data Block #2 (B3:4/1 = M0:1.3411/1) must be set to inform the secondary 1747-BSN
that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block #2.
Virtual DTSW Bit For Data Block #2
Virtual DTHW Bit For Data Block #2
VIRTUAL AND ACTUAL DTHWs