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Basic I/O Unit Instructions
Ladder Symbol
Variations
Applicable Program Areas
Operands
HKY(212)
I
I: Input word
O
O: Output word
D
D: First register word
C
C: System word
Variations
Executed Each Cycle for ON Condition
Executed Once for Upward Differentiation
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
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 hexadeci-
mal keypad's D0 to D3 data lines to the Input Unit as shown in the following
diagram.
15
14
13
12
11
10
9
I
O: Output Word (Selection Signal Outputs)
Specify the output word allocated to the Output Unit and connect the hexa-
decimal keypad's selection signals to the Output Unit as shown in the follow-
ing diagram.
15
14
13
12
11
10
9
O
Step program areas
Subroutines
OK
8
7
6
5
4
3
2
1
0
0
1
2
3
8
7
6
5
4
3
2
1
0
0
1
2
3
Section 3-23
HKY(212)
Not supported.
Not supported.
Interrupt tasks
Not allowed
Bits 00 to 03 correspond
to Input Unit inputs 0 to 3.
Bits 00 to 03 correspond to
Output Unit outputs 0 to 3.
949
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