949
Basic I/O Unit Instructions Section 3-23
Ladder Symbol
Variations
Applicable Program Areas
Operands 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.
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.
HKY(212)
I
O
D
C
I: Input word
O: Output word
D: First register word
C: System word
Variations Executed Each Cycle for ON Condition HKY(212)
Executed Once for Upward Differentiation Not supported.
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program areas Step program areas Subroutines Interrupt tasks
Not allowed OK OK Not allowed
0123456789101112131415
−−−−−−−−−−−−
I
0
1
2
3
Bits 00 to 03 correspond
to Input Unit inputs 0 to 3.
0123456789101112131415
−−−−−−−−−−−−
O
0
1
2
3
Bits 00 to 03 correspond to
Output Unit outputs 0 to 3.
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