Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER - Manual (Page 327)

Publication 1404-UM001F-EN-P - November 2009 327
Sample Applications Appendix C
When an error or timeout occurs bit maintenance is performed to ready the ladder for the next message leaving the timeout or error bit set.
0005
N7:0
8
Time Out Bit
N7:0
12
Error bit
U
B3:0
0
Message Pending
U
N9:11
1
Perform Read
U
N9:11
0
Allow Write
U
N7:0
15
Enable Transfer Bit
This calls the word swap routine and returns after the swapping has been completed.
0006
B3:0
1
Swap Words
U
B3:0
1
Swap Words
JSR
Jump To Subroutine
SBR File Number
U:3
JSR
0007 END