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On-screen Switch Inputs
5-1
On-screen Switch Inputs
5-1-1
Transmitting to the Host
Switch-number Method
Bit-switch Method
Note With this method, it is possible to push a number of switches simultaneously.
Example 1:
Switches Created at Points C and D, Which are Vertical and Horizontal Points of
Intersection for Points A and B
A
D
Minimum touch switch frame
54
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.)
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.
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.
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.
The following considerations must be taken into account, however, when
configuring the switches.
C
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.
Section 5-1
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