Notification Of The Operating Status To The Pc; (Determining The Nt20S Operating Status); Notification Of The Operating Status To The Pc (Determining The Nt20S Operating Status); Ascertainable Nt20S Statuses (Notified Operating Statuses) - Omron NT20S Operation Manual

Notification of the Operating Status to the PC

5-5 Notification of the Operating Status to the PC

(Determining the NT20S Operating Status)

5-5-1

Ascertainable NT20S Statuses (Notified Operating Statuses)

Caution:
Caution:
196
The status (operating statuses, etc.) of the NT20S can be determined from the PC
by reading the "PT status" word in the PT status notify area allocated in the PC
memory.
PT stopped
["PT status notification bits" of the PT status notify area]
15 14 13 12 11 10 9
Word
PT status notification bits
m+2
15 14 13
0 0
Make the settings so that the PT control area and PT status notify area do not over-
lap.
S PT operating status (bit 15)
When the NT20S is in the RUN mode this bit is set to ON (1). In other modes and
while the system menu is displayed it is OFF (0). When this bit is OFF allocated
bits and words cannot be read or written to.
During the run mode, ON (1) is periodically written into this bit. In order to check
whether the NT20S is operating normally or not, write OFF (0) to this bit: if it is
ON (1) 30 seconds later the NT20S is running, and if it is OFF (0), the NT20S is
stopped.
To ensure system safety, be sure to periodically read the PT operating status bit
from the host in order to ensure that the PT is always operating normally.
NT20S
Screen
number
8 7 6 5 4 3 2
0 0
12 11 10 9 8
0 0 0
PC
PT status notify area
Currently displayed screen
Content upgrade memory table
PT status
1 0 Bit
PT status
Bit
PT operating status
(1(ON) = operating / 0 (OFF) = stopped)
Screen switch strobe flag
Numeral setting strobe flag
Section 5-5