Omron NT20, User Manual

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194
Lamps, Touch Switches, Numeral Setting Section 5-3
Each time the touch switch is pressed, the bit status changes from ON
to OFF or OFF to ON.
• Set
When the touch switch is pressed, the bit comes ON and remains ON
even if the switch is pressed again.
• Reset
When the touch switch is pressed, the bit goes OFF and remains OFF
even if the switch is pressed again.
• Notification Operations
The touch switch notification operations are as follows:
When using touch switch input notification, note the following points:
• In the case of (1), the other bits in the same word as the notification bit
are turned OFF by the notification operation.
• In the case of (2), notification is executed on the basis of the contents
of the word before display, which means that the other bits are not re-
written. However, if the word contents are changed at the PLC, they will
be rewritten based on the contents before display.
• If the screen is switched while a momentary key is being pressed, the
touch switch itself disappears, so the status “OFF” is indicated. In the
case of (1) this means that the other bits in the word will also be turned
OFF.
• When using the host link, or NT link with the DM area, do not allocate
momentary touch switches and other types of touch switch to the same
word, since the notification operations are different.
In the case of (3) and (4), the notification operation has no influence on the
other bits in the word.
• Possible Bit Allocations
Notify bits and lamp bits for touch switches can be allocated to the areas
of the PLC memory listed in the following table.
Type of
Notification
Operation
When Using Host Link or
NT Link with DM Area
When Using C200H Direct
Communications or NT Link
with other than DM Area
Momentary (1) Notification in word units
(other bits go OFF)
(3) Notification in bit units
Alternate
Set
Reset (2) Notification in word units
(however, the word con-
tents are read on display
and notification is based on
this reading)
(4) Notification in bit units
Symbol C-series Alloca-
tion
CVM1/CV -series Alloca-
tion
CS/CJ-series Alloca-
tion
None IR Area
❍
CIO Area
❍
CIO Area
❍
H HR Area
❍
--- --- HR Area Not for
Host Link
A AR Area
❍
AR Area
×
AR Area
❍
L LR Area
❍
--- --- LR Area (See note 1.) Not for
Host Link
T TC Area
Timer PVs
×
TC Area
Timer PVs
×
TC Area
Timer PVs
×
TU --- --- --- --- TC area,
Timer Completion Flags
×