Omron NT20S-ST121B-EV3 User Manual page 160

Outline of Functions
Ascertainable Operating Status of the NT20
!Caution To ensure system safety, be sure to periodically read the PT operating status
The following operating status of the NT20 can be ascertained:
• NT20 operating/stopped status: Whether the NT20 is active or inactive
• Screen number: Number of the screen currently displayed
• Numeral setting input: Whether or not numerical values have been input
by numeral setting
For details on how these NT20 operating status is actually detected, refer to
5-5 Notification of the Operating Status to the PLC (Determining the NT20
Operating Status) on page 208, Screen Number Response on page 217, and
Eight-digit Number Input Notify on page 225.
bit from the host in order to ensure that the PT is always operating normally.
Section 4-2
139