Omron NT21 User Manual

2-7SectionTouch Switches
130
written. However, if the contents of the word are changed at the host during
display, they will be rewritten based on the contents before display.
• If the screen is switched while a momentary touch switch is pressed, the touch
switch itself will disappear and the OFF status will be notified to the host.
Therefore, 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, since writing in bit units is not possible, the statuses
of bits other than the notify bit in the word allocated for a momentary/set/reset
touch switch are not retained when the screen is switched.
• If the status of a bit allocated for an alternate touch switch is changed other
than by touch switch operation — for example by Programming Console op-
eration — the correct operation of the alternate touch switch cannot be guaran-
teed from that point onward (the ON and OFF states may be transposed).
• In the case of (3) and (4) in the table above, notification has no effect on the
other bits in the word.
Reference: In the case of (1) in the table above, even a bit whose status is retained by the
KEEP instruction for ladder program self latch operation will be turned OFF. In
order to avoid this, allocate bits other than in the DM Area when using the NT link
also.
Allocation of the Notify Bit
The notification bit can be allocated in the following host (PC) areas.
Symbol C-series PCs Allocation CV-series PCs Allocation CS/CJ-series PCs Allocation
None IR Area OK CIO Area OK CIO Area OK
H HR Area OK --- --- HR Area
Not for
Host Link
A AR Area OK Auxiliary Area No AR Area OK
L LR Area OK --- --- LR Area
*1
Not for
Host Link
T
TC Area,
Timer PVs
No
Timer Area,
Timer PVs
No
TC Area,
Timer PVs
No
TU --- --- --- ---
TC Area,
Timer Completion Flags
Not for
Host Link
C
TC Area,
Counter PVs
No
Counter Area,
Counter PVs
No
TC Area,
Counter PVs
No
CU --- --- --- ---
TC Area,
Counter Completion Flags
Not for
Host Link
W --- --- --- --- WR Area
Not for
Host Link
TK --- --- --- --- Task Flags
Not for
Host Link
D DM Area OK DM Area OK DM Area OK
E
EM Area
*2
,
current bank
OK
EM Area,
current bank
Not for
Host Link
EM Area
*3
(Current Bank)
Not for
Host Link
E0_ to
EC_
--- --- --- ---
EM Area,
EM banks 0 to C
Not for
Host Link
*1: LR 00000 to LR 00199 are converted to CIO 01000 to CIO 01199.
*2: The EM Area is supported only by C200HX/HG/HE(-Z)E PCs.
*3: The EM Area current bank cannot be used in CS/CJ-series PCs when a 1:N NT
Link (standard or high-speed) is being used through a Serial Communications

Omron NT21 Specifications

General

Brand	Omron
Model	NT21
Category	Touch terminals
Language	English