Omron CP - PROGRAMMING MANUAL 05-2007 - Page 818

785
Basic I/O Unit Instructions Section 3-22
External Connections Connect the hexadecimal keypad to Input Unit contacts 0 to 3 and Output Unit
contacts 0 to 3, as shown in the following diagram.
Timing Chart
Flags
COM
00 01 02 03 04 05 06 07 08 09 10 11
IN
CPM1A-20EDT
OUT
COM
00
COM
01
COM
02 03
COM
04 05 06 07
4
3
2
1
0
B
A
9
8
F
E
DC
5
6
7
Sixteen-key Pad
00000000
D+1
D
0000
D+1
000F
D
0000
D+1
00F9
D
I
0
9
D+2
00
09
15
O
04
F
00
01
02
03
1 2 345 67891011120
to
to
to
to
Once per 12 cycles
16-key
ON for a 12-cycle
period if a key is
pressed.
Turn ON flags corre-
sponding to input
keys (The flags re-
main ON until the
next input.)
Status of 16 keys
16-key selection
signals
Name Label Operation
Error Flag ER OFF