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5-28 Advanced I/O Instructions
Advanced I/O instructions enable control, with a single instruction, of previously
complex operations involving external I/O devices (digital switches, 7-segment
displays, etc.).
There are five advanced I/O instructions, as shown in the following table. All of
these are expansion instructions and must be assigned to function codes before
they can be used.
Name
Mnemonic
Function
7-SEGMENT DISPLAY OUTPUT
7SEG(––)
BCD output to 7-segment dis-
play
DIGITAL SWITCH INPUT
DSW(––)
Data input from a digital switch
HEXADECIMAL KEY INPUT
HKY(––)
Hexadecimal input from 16-key
keypad
TEN-KEY INPUT
TKY(––)
BCD input from 10-key keypad
MATRIX INPUT
MTR(––)
Data input from an 8 x 8 matrix
Although TKY(––) is used only to simplify programming, the other advanced I/O
instructions can be used to shorten cycle time, reduce the need for Special I/O
Units, and reduce system cost. With the exception of TKY(––), however, the ad-
vanced I/O instructions can only be used once each in the program and cannot
be used for I/O Units mounted to Slave Racks, where Special I/O Units must be
used.
5-28-1
7-SEGMENT DISPLAY OUTPUT – 7SEG(––)
S: First source word
IR, SR, AR, DM, HR, TC, LR
Ladder Symbols
Operand Data Areas
7SEG(––)
S
O
C
C: Control data
000 to 007
O: Output word
IR, SR, AR, HR, LR
Limitations
S and S+1 must be in the same data area.
Do not set C to values other than 000 to 007.
Overview
When the execution condition is OFF, 7SEG(––) is not executed. When the exe-
cution condition is ON, 7SEG(––) reads the source data (either 4 or 8-digit), con-
verts it to 7-segment display data, and outputs that data to the 7-segment display
connected to the output indicated by O.
The value of C indicates the number of digits of source data and the logic for the
Input and Output Units, as shown in the following table.
Source data
Display’s data input logic
Display’s latch input logic
C
4 digits (S)
Same as Output Unit
Same as Output Unit
0000
g
( )
p
Different from Output Unit
0001
Different from Output Unit
Same as Output Unit
0002
p
Different from Output Unit
0003
8 digits
(S S 1)
Same as Output Unit
Same as Output Unit
0004
g
(S, S+1)
p
Different from Output Unit
0005
Different from Output Unit
Same as Output Unit
0006
p
Different from Output Unit
0007
Advanced I/O Instructions
Section 5-28