Rockwell Automation 1747-BSN Backup Scanner Module - Manual (Page 144)

Publication 1747-UM010B-EN-P - September 2003
9-2 Programming Techniques
Program File 2
m
0000
COP
Copy File
Source #M1:1.3400
Dest
#B3:1
Length 2
COP
0001
B3:1
7
B3:2
6
B3:2
14
JSR
Jump To Subroutine
SBR File Number
U:3
0002
B3:1
6
B3:2
6
B3:2
14
JSR
Ju p To Subroutine
SBR File Number
U:4
JSR
0003 END
Copy the System Status Word (SSW) and the Module Status Word (MSW) from the 1747-BSN module to internal storage words in the
SLC processor every program scan. Bits 6 and 7 of the SSW word indicate whether this processor is primary or secondary at any given
time. Bits 6 and 14 of the MSW indicate whether the local or remote system is in the primary or secondary mode, respectively. Virtual
SSW and MSW words/bits are used to minimize M-file transfers, thereby minimizing their effects on the program scan time.
This rung executes subroutine number 3 when the local system is in the secondary mode. Subroutine 3 contains logic which must be
executed to properly transfer HSSL data from the secondary 1747-BSN module to the secondary SLC processor.
Virtual SSW Bit:
1 = Local System in
Secondary Mode Virtual MSW Bit:
1 = Local System in
Primary Mode Virtual MSW Bit:
1 = Remote System
in Primary Mode
This rung executes subroutine number 4 when the local system is in the primary mode. Subroutine 4 contains logic which must be
executed to properly transfer HSSL data from the primary 1747-BSN module to the primary SLC processor.
Virtual SSW Bit:
1 = Local System in
Primary Mode Virtual MSW Bit:
1 = Local System in
Primary Mode Virtual MSW Bit:
1 = Remote System
in Primary Mode