Function 16 - Write Multiple Registers - WEG CFW100 User Manual

Example: writing of 30 Hz as the speed reference (P0683) (assuming a motor frequency of 60 Hz) for the slave
at address 3.
Address: 3 = 03h (1 byte)

Initial register address: 683 = 02ABh (2 bytes)

Value for parameter: 1000h (2 bytes)

Request (Master)
Field
Slave Address
Function
Register (high)
Register (low)
Value (high)
Value (low)
CRC-
CRC+
Note that for this function the slave response is an identical copy of the request made by the master.
6.3 FUNCTION 16 – WRITE MULTIPLE REGISTERS
This function allows writing values for a group of registers, which must be in a numerical sequence. It can also
be used to write in a single register (each field represents a byte):
Request (Master)
Slave Address
Function
Initial register address (high byte)
Initial register address (low byte)
Number of registers (high byte)
Number of registers (low byte)
Byte count (number of data bytes)
Datum 1 (high)
Datum 1 (low)
Datum 2 (high)
Datum 2 (low)
etc...
CRC-
CRC+
Example: writing of the acceleration time (P0100) equal to 1.0 s and the deceleration time (P0101) equal to 2.0
s, of a slave at address 15.
Address: 15 = 0Fh (1 byte)

Initial register address: 100 = 0064h (2 bytes)

Value for the fist parameter: 10 = 000Ah (2 bytes)

Value for the second parameter: 20 = 0014h (2 bytes)

Request (Master)
Field
Slave Address
Function
Initial register (high)
Initial register (low)
Number of registers (high)
Number of registers (low)
Byte count
P0100 (high)
P0100 (low)
P0101 (high)
P0101 (low)
CRC-
CRC+
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Detailed Description of the Functions
Response (Slave)
Value Field
03h Slave Address
06h Function
02h Register (high)
ABh Register (low)
10h Value (high)
00h Value (low)
F5h CRC-
B0h CRC+
Response (Slave)
Slave Address
Function
Initial register address (high byte)
Initial register address (low byte)
Number of registers (high byte)
Number of registers (low byte)
CRC-
CRC+
Response (Slave)
Value Field
0Fh Slave Address
10h Function
00h Initial register (high)
64h Initial register (low)
00h Number of registers (high)
02h Number of registers (low)
04h CRC-
00h CRC+
0Ah
00h
14h
E0h
91h
Value
03h
06h
02h
ABh
10h
00h
F5h
B0h
Value
0Fh
10h
00h
64h
00h
02h
01h
39h