Mitsubishi Electronics FX3G User Manual
468
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.5 FNC 84 – CCD / Check Code
3. 8-bit conversion mode (while M8161 is ON)
(M8161 is used also for the RS, ASCI, HEX and CRC instructions.)
With regard to "n" data starting from
, the addition data and horizontal parity data of only low-order 8 bits are
stored to
and
+1 respectively.
M8161 is also used for the RS, ASCI, HEX and CRC instructions. When using the 8-bit mode, set M8161 to normally
ON. M8161 is cleared when the PLC mode is changed from RUN to STOP.
ON. M8161 is cleared when the PLC mode is changed from RUN to STOP.
Example of 8-bit conversion
In the following program, conversion is executed as follows:
In the following program, conversion is executed as follows:
Example of data contents
D 100
K100
= 01100100
D 101
K111
= 0110111 (1)
←
D 102
K100
= 01100100
D 103
K 98
= 01100010
D 104
K123
= 0111101 (1)
←
D 105
K 66
= 01000010
D 106
K100
= 01100100
D 107
K 95
= 0101111 (1)
←
D 108
K210
= 11010010
D 109
K 88
= 01011000
Total
K1091
Horizontal parity
1000010 (1)
← When the number of "1" is odd, the horizontal parity is "1".
When the number of "1" is even, the horizontal parity is "0".
S
D
D
M8161
M8000
FNC 84
CCD
n
S
Command
input
D
8-bit mode
Ignored
Low-order 8 bits
16 bits
Source data
M8161
M8000
FNC 84
CCD
D100
D0
K10
X010
8-bit mode
S
1
1
0
0
0
0
1
0
0
0
1
0
0
0
0
0
D 0
"1091" in BCD
1
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
D 1
Horizontal parity