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Basic I/O Unit Instructions
Leftmost 4 digits
D
0
D
1
D
2
D
3
LE3
LE2
Timing Chart
Function
(4 digits, 1
block)
Data output
00 to 03
Latch output 0
Latch output 1
Latch output 2
Latch output 3
One Round Flag
Flags
7-segment display
V
DD
(+)
V
SS
(0)
LE1
LE0
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.
• 4-digit display: Transistor Output Units with 8 or more output points
• 8-digit display: Transistor Output Units with 16 or more output points
Bit(s) in O
(4 digits, 2
blocks)
00 to 03
10
04 to 07
04
08
05
09
06
10
07
11
08
12
1 2
3
12 cycles required to complete one round
Name
Error Flag
Rightmost 4 digits
V
D
DD
(+)
D
V
D
SS
(0)
D
LE3
LE2
LE1
Output status (Data and latch logic depends on C)
0
1
2
3
10
10
10
4
5
6
7
8
9 10 11 12 1
Label
ER
OFF
Section 3-23
0
1
2
3
LE0
Output Unit
Note 0 to 3: Data output for word S
4 to 7: Data output for word S+1
Operation
OD212
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DC
COM
961
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