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CHAPTER 8 - CFW-09 OPTIONS AND ACCESSORIES
Example: to drive a ramp enable command (bit 100 = 1) of a CFW-09
at the address 1:
Query (Master)
Field
Value
Slave address
01h
Function
05h
Bit number (high)
00h
Bit number (low)
64h
Bit value (high)
FFh
Bit value (low)
00h
CRC-
CDh
CRC+
E5h
Response (Slave)
Field
Value
Slave address
01h
Function
05h
Bit number (high)
00h
Bit number (low)
64h
Bit value (high)
FFh
Bit value (low)
00h
CRC-
CDh
CRC+
E5h
8.14.3.4
Function 06 - Write
Single Register
This function is used to write a value to a single register. This function has
following structure (values are always hexadecimal values, and each field
represents one byte):
For this function, the slave response is an identical copy of the query sent by
the master.
Query (Master)
Slave address
Function
Register address (byte high)
Register address (byte low)
Value for the register (byte high)
Value for the register (byte low)
CRC-
CRC+
Response (Slave)
Slave address
Function
Register address (byte high)
Register address (byte low)
Value for the register (byte high)
Value for the register (byte low)
CRC-
CRC+
Example: write of the speed reference (basic variable 4) equal to 900 rpm, of a
CFW-09 at address 1. Please, remember that the value for the basic variable 4
depends on the used motor type and that the value 8191 is equal to the rated
motor speed. In this case, we suppose that the used motor has a rated speed
of 1800 rpm, thus the value to be written into the basic variable 4 for a speed of
900 rpm is the halve of 8191, i.e., 4096 (1000h).
Query (Master)
Field
Value
Slave address
01h
Function
06h
Register (high)
13h
Register (low)
8Ch
Value (high)
10h
Value (low)
00h
CRC-
41h
CRC+
65h
Response (Slave)
Field
Value
Slave address
01h
Function
06h
Register (high)
13h
Register (low)
8Ch
Value (high)
10h
Value (low)
00h
CRC-
41h
CRC+
65h
For this function, the slave response will be again a copy identical to the request
made by the master.As alreadyinformed above, the basic variables are addressed
from 5000, thus the basic variable 4 will be addressed at 5004 (138Ch).