Keyence Visual KV Series Manual de usuario Pagina 155

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2.4 Instruction Details
1
2
3-131
Chapter 2 Instructions
HKEY: 16-Key Input
Reads hexadecimal key data on time-
sharing basis and outputs these data to
special utility relays 2900 to 2915.
FUN
SET
1
LD
7
HKEY
nnnn
mmmm
0005
HKEY
0000
0500
Input relay
Output relay
Line No. Instruction Operand
0000 LD 0005
0001 HKEY 0000 0500
COM
24
VDC
+
-
000 001
KV
002 003
0
COM 500 501 502 503
4
8
C
1
5
9
D
2
6
A
E
3
7
B
F
Pressing two or more keys
simultaneously is OK.
(With diode)
Pressing two or more keys
simultaneously is invalid.
:
ON: Key input read operation has
completed.
Relay No. 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
Hex key 0 1 23456789ABCDE F
ON: Pressing two or more keys
simultaneously is not valid.
R: Reading W: Writing
Example
Coding
Description
When input relay 0005 turns ON, the operand hexadecimal key data is read.
HKEY instruction employs four inputs and four outputs arranged as shown below.
Refer to "Fetching 16-key input" (p. 3-133) for the programming example.
The HKEY instruction employs four input relays and four output relays from the
specified number.
Inputs are processed on a time-sharing basis, so that input processing requires 8
scan time cycles (approx. 160 msec when the scan time is 20 msec or less).
When a hexadecimal key is pressed, the HKEY instruction turns ON the corre-
sponding special utility relay (2900 to 2915).
The special utility relay status indicates whether two or more keys can be
pressed simultaneously or whether a key input read operation has completed, as
shown in the following table:
Note 1: An HKEY instruction can be defined only once in a program.
Note 2: The HKEY instruction turns output relays ON/OFF every scan time. Connect
the device with transistor output.
Note 3: If the scan time is shorter than 8 ms, set the input time constant smaller
than the scan time.
Relay No.
2814 R/W 2815 R
Status
HKEY
KVNKA Chap 02_4bP.p65 08.3.11, 0:00 PM131
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