Rockwell Automation Logix5000 Controllers Messages Programming Manual - Manual (Page 21)

Manage multiple messages Chapter 2
Send the second group of MSGs
If Msg_Group.1 changes from 0 -> 1 then
send Msg_2.
send Msg_3.
Enable the next group of MSGs
If the MSGs in group 1 are currently enabled (Msg_Group.1 = 1)
and Msg_2 is in the state of done or error
and Msg_3 is in the state of done or error
then:
Msg_Group.1 = 0. This disables the current group of MSGs.
Msg_Group.2 = 1. This enables the next group of MSGs.
Send the next group of MSGs
If Msg_Group.1 changes from 0 -> 1 then
send Msg_2.
send Msg_3.
Rockwell Automation Publication 1756-PM012F-EN-P - October 2014 21