How To Control Nt20 Functions - Omron NT20S-ST121B-EV3 User Manual

NT20 Status Control
5-4-2

How to Control NT20 Functions

Symbol C-series
None IR Area
H HR Area
A AR Area
L LR Area
T TC Area
Timer PVs
• Continuous Buzzer (Bit 13) and Intermittent Buzzer (Bit 12)
In the case of both buzzers, when the respective bit is ON the buzzer
sounds and when it is OFF the buzzer does not sound.
The "continuous buzzer" sounds continuously without interruption.
The "intermittent buzzer" sounds for 0.5 seconds at 0.5 second intervals.
If both Bit 13 and Bit 12 are turned ON simultaneously, Bit 13 takes priority
and the continuous buzzer is selected.
Another way to stop a buzzer sounding is to use a touch switch to which the
buzzer stop attribute function is allocated.
Whether or not the buzzer actually sounds also depends on the setting of the
"buzzer" memory switch of the NT20. For details on this setting, refer to 3-8-2
Using the Buzzer on page 107.
Besides using PT status control bit operations, the buzzer status can also be
controlled by the screen attributes. The screen attributes are set by using the
Support Tool. The functions that can be set using the screen attributes are the
following:
Buzzer attribute: Set whether or not the buzzer will sound when the
screen is displayed and, if it sounds, the type of buzzer.
• Backlight Mode (Bit 8)
If bit 8 is turned ON when the screen is displayed (bit 15 = ON), the screen
is made to flash using the backlight. When bit 8 is turned OFF, normal dis-
play is resumed.
When the screen is not displayed (bit 15 = OFF), the backlight mode is in-
valid.
It is possible to use NT20 switch settings to make the backlight go off auto-
matically after a set time during which there have been no operations.
Besides using PT status control bit operations, the backlight status can also
be controlled by the screen attributes. The screen attributes are set by using
the Support Tool. The functions that can be set using the screen attributes are
the following:
Backlight: Set whether the backlight will be continuously or inter-
mittently lit when the screen is displayed.
This section describes how to control the functions of the NT20.
• Restrictions on Allocating Words
The PT status control area (PLC → PT) can be allocated to the PLC mem-
ory areas listed in the following table.
Alloca- CVM1/CV -series
tion
❍
CIO Area
❍
---
❍
AR Area
❍
---
×
TC Area
Timer PVs
Alloca- CS/CJ-series
tion
❍
CIO Area
--- HR Area
×
AR Area
--- LR Area (See note 1.)
×
TC Area
Timer PVs
Section 5-4
Alloca-
tion
❍
Not for
Host Link
❍
Not for
Host Link
×
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