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Basic I/O Unit Instructions
External Connections
Timing Chart
I
00
01
02
03
16-key
0
to
9
to
F
D+2
00
to
09
to
15
O
04
0
1 2 3 4 5 6 7 8 9 101112
Once per 12 cycles
0000
0000
D+1
D
952
Connect the hexadecimal keypad to Input Unit contacts 0 to 3 and Output Unit
contacts 0 to 3, as shown in the following diagram.
ID212
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
COM
COM
Input Unit
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
0000
000F
D+1
D
C
D
E
F
8
9
A
B
4
5
6
7
3
0
1
2
0000
00F9
D+1
D
Section 3-23
OD212
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
COM
COM
Output Unit
16-key selection
signals
Status of 16 keys
Turn ON flags corre-
sponding
to input
keys (The flags re-
main ON until the
next input.)
ON for a 12-cycle
period if a key is
pressed.
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