Omron NT-series Programmable Terminal V022-E3-1 - Manual (Page 137)

Caution
Section 4-2
Ascertainable NT600S Statuses
The following NT600S statuses can be ascertained.
PT operating status :Whether the NT600S is operating or stopped
Screen number :Screen number of the currently displayed screen
Numeral setting input :Whether a numerical value has been input by
numeral setting
For details on the actual method for detecting these operating statuses, refer to
Section 5-5 “Notification of the Operating Status to the PC (Determining the
NT600S Operating Status)” (page 197), and also “Screen Number Response”
(page 217) and “Notifying Input to the Numeral Memory Table” (page 217).
In order to ensure system safety, be sure to periodically read the PT operating
status bit at the host during operation to confirm that the PT is always operating
correctly.