KEYENCE Visual KV Series - Manual (Page 155)

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
L D
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 2 3 4 5 6 7 8 9 A B C D E 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 PM 131