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Basic I/O Unit Instructions
Applicable Program Areas
Operands
Block program areas
Not allowed
OK
I: Input Word (Data Line D0 to D3 Inputs)
Specify the input word allocated to the Input Unit and connect the digital
switch's D0 to D3 data lines to the Input Unit as shown in the following dia-
gram.
15
14
13
12
11
10
I
Leftmost 4 digits
O: Output Word (CS/RD Control Signal Outputs)
Specify the output word allocated to the Output Unit and connect the digital
switch's control signals (CS and RD signals) to the Output Unit as shown in
the following diagram.
15
14
13
12
11
O
One Round Flag
RD0 Read signal
D: First Result Word
Specifies the leading word address where the external digital switch's set val-
ues will be stored.
15
D
15
D+1
(See note.)
C1: Number of Digits
Specifies the number of digits that will be read from the external digital switch.
Set C1 to 0000 hex to read 4 digits or 0001 hex to read 8 digits.
15
C1
C2: System Word
Specifies a work word used by the instruction. This word cannot be used in
any other application.
Step program areas
Subroutines
OK
9
8
7
6
5
4
3
2
1
D3
D2
D1
D0
10
9
8
7
6
5
4
3
2
12 11
8
7
Digit 4
Digit 3
12 11
8
7
Digit 8
Digit 7
Note: Only when C1 = 0001 hex to read 8 digits.
12 11
8
7
Number of digits
0000 hex: 4 digits
0001 hex: 8 digits
Section 3-23
Interrupt tasks
Not allowed
0
D0
D1
Rightmost 4 digits
D2
D3
1
0
CS0
CS1
CS signals
CS2
CS3
4
3
0
Digit 2
Digit 1
4
3
0
Digit 6
Digit 5
4
3
0
941
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