Omron NT20S, Руководство по эксплуатации

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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bit
0 0 0 0 0
Word
m+2
15 14 13 12 11 10 9 8 Bit
PT status notification bits 0 0
PT status
PT operating status
(1(ON) = operating / 0 (OFF) = stopped)
Screen switch strobe flag
Numeral setting strobe flag
196
Notification of the Operating Status to the PC Section 5-5
5-5 Notification of the Operating Status to the PC
(Determining the NT20S Operating Status)
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.
NT20S PC
PT stopped
PT status notify area
Currently displayed screen
Screen
number
Content upgrade memory table
PT status
5-5-1 Ascertainable NT20S Statuses (Notified Operating Statuses)
[“PT status notification bits” of the PT status notify area]
Caution: 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.
Caution: 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.