952
Basic I/O Unit Instructions Section 3-23
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.
The inputs and outputs can be connected to the following kinds of Basic I/O
Units and High-density I/O Units as long as they are not mounted in a SYS-
MAC BUS Remote I/O Rack.
• DC Input Units with 8 or more input points
• Transistor Output Units with 8 or more output points
Timing Chart
1
3
5
7
9
11
13
15
COM
0
2
4
6
8
10
12
14
COM
ID212
1
3
5
7
9
11
13
15
COM
0
2
4
6
8
10
12
14
COM
OD212
C
8
4
0
D
9
5
1
E
A
6
2
F
B
3
7
Input Unit
Output Unit
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
1234567891011120
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
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