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4-68
4-2 Function Mode
4
Func
tions
Function code
<Error Check>
•CRC (Cyclic Redundancy Check) is used for the ModBus-RTU error check.
•The CRC code is 16-bit data generated for the block of random length data in the 8-bit unit.
•To generate the CRC code, the generation polynomial CRC-16 (X
16
+X
15
+X
2
+1) is used.
CRC-16 Calculation Example
<Header, Trailer (Silent interval)>
•Wait time between receiving the query from the master and the response by the Inverter.
•Be sure to provide the 3.5-character length for wait time. If the length does not reach 3.5
characters, the Inverter does not respond.
•The actual communication wait time is the total of the silent interval (3.5-character length) and
C078 (communication wait time) setting.
Function code
Function
Maximum number of data
bytes in 1 message
Maximum data number in 1
message
01h
Coil status reading
4
32 coils (in bits)
03h
Holding register content reading
8
4 registers (in bytes)
05h
Writing into the coil
2
1 coil (in bits)
06h
Writing into holding register
2
1 registers (in bytes)
08h
Loopback test
⎯
⎯
0Fh
Writing into multiple coils
4
32 coils (in bits)
10h
Writing into multiple registers
8
4 registers (in bytes)
CRC-16
calculation
CRC =FFFFh
*1
CRC
*1
Hi
Lo
CRC register (2 bytes)
Target data
Exists
All target data
completed
Interchange Hi and Lo
bytes of CRC
*1
Completed
CRC
*1
= CRC
*1
XOR target data
8-bit shift
Completed
Bits left
CRC
*1
= Shift CRC
*1
by 1 bit
to the right
0
1
Overflow bit
after shift
CRC =CRC XOR A001h
*1
*1
Shift by 1 byte against target data
Содержание JX-A4004
Страница 2: ......
Страница 16: ...14 About This Manual ...
Страница 19: ...Chapter 1 Overview 1 1 Functions 1 2 1 2 Appearance and Names of Parts 1 4 ...
Страница 24: ......
Страница 25: ...Chapter 2 Design 2 1 Installation 2 2 2 2 Wiring 2 7 ...
Страница 79: ...Chapter 4 Functions 4 1 Monitor Mode 4 2 4 2 Function Mode 4 6 ...
Страница 167: ...Chapter 5 Maintenance Operations 5 1 Special Display List Error Codes 5 2 5 2 Troubleshooting 5 6 ...
Страница 174: ...5 8 5 2 Troubleshooting 5 Maintenance Operations ...
Страница 175: ...Chapter 6 Inspection and Maintenance 6 1 Inspection and Maintenance 6 2 6 2 Storage 6 8 ...
Страница 190: ...7 8 7 3 Dimensional Drawing 7 Specifications JX A2004 AB004 80 5 6 143 1 9 109 5 27 2 6 107 155 67 5 ...
Страница 191: ...7 9 7 3 Dimensional Drawing 7 Specifications JX A2007 80 67 5 5 6 143 1 9 132 5 50 2 6 130 155 ...
Страница 192: ...7 10 7 3 Dimensional Drawing 7 Specifications JX A4004 AB007 110 98 5 5 6 176 189 128 1 9 130 5 28 2 6 ...
Страница 194: ...7 12 7 3 Dimensional Drawing 7 Specifications JX A2055 A2075 A4055 A4075 180 235 165 250 164 6 1 9 167 5 90 1 6 ...
Страница 199: ...Appendix Appendix 1Parameter ListApp 2 Appendix 2Product Life CurveApp 18 ...
Страница 217: ...INDEX ...
Страница 220: ......