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5-3
Section
Lamps and Touch Switches
215
- Momentary
When the touch switch is pressed the bit comes ON and when it is released
the bit goes OFF.
- Alternate
When the touch switch is pressed the bit comes ON if it is OFF and goes OFF
if it is ON.
- Set
When the touch switch is pressed the bit comes ON, and it remains ON when
the touch switch is released.
- Reset
When the touch switch is pressed the bit goes OFF, and it remains OFF when
the touch switch is released.
S
Important points relating to notification operations
Details on touch switch notification operations are tabled below.
Type of notification
operation
When using host link
When using NT link (DM
area)
When using NT link
(other than DM area)
Momentary
(1) Notification in word units
(all other bits in the word
are OFF)
(3) Notification in bit units
Alternate
Set
Reset
(2) Notification in word units
(note that the word con-
tents are read on display
and notification is based
on these contents)
(4) Notification in bit units
When using touch switch input notification, note the following points.
- In the case of (1) in the table, the other bits in the same word are turned OFF
by notification.
- In the case of (2) in the table, since notification is executed on the basis of the
contents of the word before display, the other bits in the word are not overwrit-
ten. However, if the contents of the word are changed at the PC during dis-
play, they will be rewritten based on the contents before display.
- If the screen is switched while a momentary key is pressed, the touch switch
itself will disappear and the “OFF” status will be notified to the PC. This
means that, in the case of (1) in the table, all the bits in the word will be set to
the “OFF” status.
- When using the host link, or when using the NT link with the DM area, the
notification operation is different for the momentary type and the other types,
and they should not both be specified in the same word.
In the case of (3) and (4), notification has no effect on the other bits in the word.
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
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