Omron CP - PROGRAMMING MANUAL 05-2007 - Page 826

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Basic I/O Unit Instructions Section 3-22
Even if the connected 7-segment display has fewer than 4 digits or 8 digits in
its display, 7SEG(214) will still output 4 digits or 8 digits of data.
External Connections Connect the 7-segment display to the Output Unit as shown in the following
diagram. This example shows an 8-digit display. With a 4-digit display, the
data outputs (D0 to D3) would be connected to outputs 0 to 3 and the latch
outputs (LE0 to LE3) would be connected to outputs 4 to 7. Output point 12
(for 8-digit display) or output point 8 (for 4-digit display) will be turned ON
when one round of data has been output, but it is not necessary to connect
them unless required by the application.
Timing Chart
Flags
COM
00 01 02 03 04 05 06 07 08 09 10 11 00 01 02 03 04 05 06 07 08 09 10 11
IN@ CH IN@ CH
CPM1A-40EDT
OUT@ CH OUT@ CH
COM
00
COM
01
COM
02 03
COM
04 05 06 07
COM
00 01 02 03
COM
04 05 06 07
LE3 LE2 LE1 LE0
D0
D1
D2
D3
VDD
(+)
VSS
(0)
LE3 LE2 LE1 LE0
VDD
(+)
VSS
(0)
D0
D1
D2
D3
7-se
g
ment dis
p
la
y
Leftmost 4 digits Rightmost 4 digits
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
0
6
0
7
0
8
0
5
0
4
00 to 0
3
1
0
11
12
0
9
0
8
00 to 0
3
04 to 0
7
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
Name Label Operation
Error Flag ER OFF