Inovance H3U Series - Page 609

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9 Communication9.4.3 Modbus Parameter Numbers and Data Addressing
Incorrect response: See "g) Incorrect response frame".
• N: The H3U PLC can write a maximum of 255 coils at a time.
f) Parameter number 0x10 (16): Writes multiple registers.
Request frame format: slave address + 0x10 + head address of registers + number of registers + number of
bytes + register value + CRC code
No. Denition of Data
(Byte)
Number of
Bytes
Description
1 Slave address 1 The value ranges from 1 to 247, set by D8121.
2 0x10 (parameter
number)
1 The instruction is to write multiple registers.
3 Head address of
registers
2 Upper bits are followed by lower bits. See "Register
addressing".
4 Number of registers 2 Upper bits are followed by lower bits. The
maximum of N is 120.
5 Number of bytes 1 The value is N x 2
6 Register value N x 2 (N x 4)
7 CRC code 2 Upper bits are followed by lower bits.
Response frame format: slave address + 0x10 + head address of registers + number of registers + CRC
code
No.
Denition of Data
(Byte)
Number of
Bytes
Description
1 Slave address 1 The value ranges from 1 to 247, set by D8121.
2
0x10 (parameter
number)
1 The instruction is to write multiple registers.
3
Head address of
registers
2
Upper bits are followed by lower bits. See "Register
addressing".
4 Number of registers 2
Upper bits are followed by lower bits. The
maximum of N is 120.
5 CRC code 2 Upper bits are followed by lower bits.
Incorrect response: See "g) Incorrect response frame".
• N: The H3U PLC can write a maximum of 123 registers at a time.