Omron NS - HOST Connection Manual page 41

3-1-4 Notify Command Behavior
When anything has changed in the PT memory, by e.g. touch switch operation on PT,
numerical input or character string input, PT sends change notice command to host.
In addition to Memory Link connection, PT memory serves other purposes as well. If
all changes would be communicated to host, the host would be burdened more than is
needed. For that reason, PT communicates only changes from a designated number
and up. Changes in PT memory areas with a lower number are not communicated.
Set the number in Communications conditions -> Start Communication $B and Start
Communication &W.
no notice
notify command
3-1-4 Flow control
When too many commands are sent, PT cannot process timely. Communications
buffer overflows. Commands and command sequence get lost.
For that reason, set Communications conditions Response to ON when PT to host
command interval frequency becomes high.
4
$W
$W0
Notice start $W
Only changes from specified $W number and up
are communicated to host using the
change notice Command.
PT
operation
Number
input
Number
input