Danfoss VLT Series Design Manual page 142

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)
7
Force Data LO
(Coils 10-9)
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)
142
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)
-
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VLT HVAC Drive Design Guide