Danfoss VLT HVAC Drive FC 100 Series Design Manual page 144

7. RS-485 Installation and Set-up
7.10.3. Force/Write Multiple Coils (0F HEX)
This function forces each coil in a sequence of coils to either ON or OFF. When broadcast the function forces the same coil references in all attached
slaves. .
The query message specifies the coils 17 to 32 (speed set-point) to be forced. Coil addresses start at zero, i.e. coil 17 is addressed as 16.
Field Name
Slave Address
Function
Coil Address HI
Coil Address LO
Quantity of Coils HI
Quantity of Coils LO
Byte Count
Force Data HI
(Coils 8-1)
Force Data LO
(Coils 10-9)
7
Error Check (CRC)
Response
The normal response returns the slave address, function code, starting address, and quantity of coiles forced.
Field Name
Slave Address
Function
Coil Address HI
Coil Address LO
Quantity of Coils HI
Quantity of Coils LO
Error Check (CRC)
144
Example (HEX)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
02
20
00 (ref. = 2000hex)
-
Example (HEX)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
-
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
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VLT HVAC Drive Design Guide