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Basic I/O Unit Instructions
Ladder Symbol
Variations
Applicable Program Areas
Operands
958
7SEG(214)
S
S: Source word
O: Output word
O
C: Control data
C
D
D: 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
S: Source Word
Specify the first source word containing the data that will be converted to 7-
segment display data.
15
S
15
S+1
O: Output Word (Data and Latch Outputs)
Specify the output word allocated to the Output Unit and connect the 7-seg-
ment display to the Output Unit as shown in the following diagram.
• Converting 4 digits
15
14
13
12
11
10
O
One Round Flag
Latch outputs
• Converting 8 digits
15
14
13
12
11
10
O
One Round Flag
LE3
LE2
Latch outputs
LE1
LE0
Step program areas
Subroutines
OK
12 11
8
7
4
Digit 4
Digit 2
Digit 3
12 11
8
7
4
Digit 8
Digit 6
Digit 7
9
8
7
6
5
4
3
2
1
0
LE3
LE2
LE1
LE0
9
8
7
6
5
4
3
2
1
0
D0
D1
Rightmost 4-digit data output
D2
D3
Section 3-23
7SEG(214)
Not supported.
Not supported.
Interrupt tasks
Not allowed
3
0
Digit 1
3
0
Digit 5
D0
D1
4-digit data output
D2
D3
D0
D1
Leftmost 4-digit data output
D2
D3
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