54
5-1
On-screen Switch Inputs
DT-type PTs can transmit to the host the input status of touch switches set on
screens. A maximum of 64 switches can be set per screen. DN-type PTs can
transmit to the host the inputs of 12-key Function Key Units. DF-type PTs can
transmit to the host the input status of the function keys located at the bottom
of the display. (The standard number of function keys is 12.)
5-1-1
Transmitting to the Host
There are two ways to transmit the input status of switches to the host.
These two methods, which are determined by a “screen attributes” setting at
the Support Tool, are described briefly below. For more detail, refer to the
Host Interface Unit Operation Manual
. For instructions on setting screen at-
tributes, refer to the
NT-series Support Tool Operation Manual
.
Switch-number Method
In order to use the switch-number method, “bit input” screen attribute must
be set to “disabled.” Using this method, when a switch is pressed the number
corresponding to that switch is transmitted to the host as a numeric value in
three digits of BCD. When two switches are pressed, the first one is given
priority in transmission. When using an NT600M-LK201 or NT600M-RT121
Host Interface Unit, send the data to the host by means of the strobe signal
in the PT status information which is output when switches are pressed.
Bit-switch Method
In order to use the switch-number method, “bit input” screen attribute must
be set to “enabled.” When this method is used, the status of each switch is
transmitted to the host as a bit status. This is the method used when substi-
tuting for ordinary operating switches. You can use it for ordinary bit input
switches from a Programmable Controller.
Note
With this method, it is possible to push a number of switches simultaneously.
The following considerations must be taken into account, however, when
configuring the switches.
Example 1:
Switches Created at Points C and D, Which are Vertical and Horizontal Points of
Intersection for Points A and B
If switches A, B, and C are turned ON
simultaneously in this switch configuration, switch D
will also turn ON.
If switches A, B, and D are turned ON simultaneous-
ly, switch C will also turn ON.
Minimum touch switch frame
A
C
B
D
On-screen Switch Inputs
Section 5-1
Содержание NT600M Series
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