7 APPLICATION INSTRUCTIONS
7.19 Check Code Instructions
905
7
■
8-bit conversion mode (while SM772 is ON)
With regard to (n) data points starting from (s), the addition data and horizontal parity data of only low-order 8 bits are stored
to (d) and (d)+1 respectively.
Ex.
When (n)=6
<Calculation of addition data value>
In 8-bit conversion mode, addition data is determined by adding 6 bytes in the following shaded portion. The addition data is
thus determined as "03B2H", and therefore "03B2H" is stored in the device specified by (d).
<Calculation of horizontal parity value>
In 8-bit conversion mode, the above shaded portion becomes the horizontal parity calculation target. The number of ON (1)
bits is calculated to determine the parity value which becomes ON (1) when the number of ON (1) bits is finally odd or OFF (0)
when it is finally even. The horizontal parity value is stored in the device specified by (d)+1.
In the following table, C2H is stored in the device specified by (d)+1.
Operation error
There is no operation error.
Bit/horizontal parity value
b7
b6
b5
b4
b3
b2
b1
b0
Value
Lower 8 bits of D0
0
1
1
0
0
1
0
0
64H
Lower 8 bits of D1
0
1
1
1
1
0
1
1
7BH
Lower 8 bits of D2
1
1
0
0
1
0
1
1
CBH
Lower 8 bits of D3
1
1
1
1
1
1
1
1
FFH
Lower 8 bits of D4
1
1
1
1
1
0
0
1
F9H
Lower 8 bits of D5
0
0
0
1
0
0
0
0
10H
Horizontal parity value
1
1
0
0
0
0
1
0
C2H
61H
64H
64H
10H
7BH
7BH
FAH
CBH
CBH
FFH
FFH
FFH
7FH
F9H
F9H
D0
24932
D1
4219
D2
-1333
D3
-1
D4
32761
27H
10H
10H
64H
7BH
CBH
FFH
F9H
10H
D5
10000
Upper
Lower
Decimal
Hexadecimal
Summary of Contents for MELSEC iQ-R Series
Page 1: ...MELSEC iQ R Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
Page 34: ...32 MEMO ...
Page 35: ...33 PART 1 PART 1 OVERVIEW This part consists of the following chapter 1 OVERVIEW ...
Page 68: ...66 1 OVERVIEW 1 5 Precautions on Programming MEMO ...
Page 1448: ...1446 14 REDUNDANT SYSTEM INSTRUCTIONS 14 2 Disabling Enabling System Switching MEMO ...
Page 1972: ...1970 33 TIME DATA TYPE FUNCTIONS 33 4 Division MEMO ...
Page 2067: ...APPX Appendix 5 PID Control Program Examples 2065 A 252 Set PID control data for loop 2 ...
Page 2109: ......