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Advanced I/O Instructions Section 5-31
The outputs can be connected from a Transistor Output Unit with 8 or more
output points for four digits or 16 or more output points for eight digits.
Note 1. Output Unit outputs normally employ negative logic. (Only the PNP output
type employs positive logic.)
2. The 7-segment display may require either positive or negative logic, de-
pending on the model.
Using the Instruction
If the first word holding the data to be displayed is specified at S, and the out-
put word is specified at O, and the SV taken from the table below is specified
at C, then operation will proceed as shown below when the program is exe-
cuted.
Data Storage Format
If only four digits are displayed, then only word S will be used.
Set Values for Selecting Logic and Number of Digits (C)
Note Do not set C to values other than 000 to 007.
7SEG(88)
S
O
C
S: First source word
O: Output word
C: Control data
Leftmost 4 digits Rightmost 4 digits
S+1 S
Number of digits displayed Display Unit data input and
Output Unit logic
Display Unit latch input and
Output Unit logic
C setting data
4 digits (4 digits, 1 block) Same Same 000
Different 001
Different Same 002
Different 003
8 digits (4 digits, 2 blocks) Same Same 004
Different 005
Different Same 006
Different 007
Function Bit(s) in O Output status (Data and latch logic depends on C)
(4 digits, 1
block)
(4 digits, 2
blocks)
Latch output 2
Latch output 3
One Round Flag
Latch output 1
Latch output 0
Data output
06
07
08
05
04
00 to 03
10
11
12
09
08
00 to 03
04 to 07
10
0
10
1
10
2
10
3
1 2 3 4 5 6 7 8 9 10 11 12 1
12 cycles required to complete one round
Note 0 to 3: Data output for word S
4 to 7: Data output for word S+1
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