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
Example (HEX)
Slave Address
01 (frequency converter address)
Function
0F (write multiple coils)
Coil Address HI
00
Coil Address LO
10 (coil address 17)
Quantity of Coils HI
00
Quantity of Coils LO
10 (16 coils)
Byte Count
02
Force Data HI
(Coils 8-1)
20
Force Data LO
(Coils 10-9)
00 (ref. = 2000hex)
Error Check (CRC)
-
Response
The normal response returns the slave address, function code, starting address, and quantity of
coiles forced.
Field Name
Example (HEX)
Slave Address
01 (frequency converter address)
Function
0F (write multiple coils)
Coil Address HI
00
Coil Address LO
10 (coil address 17)
Quantity of Coils HI
00
Quantity of Coils LO
10 (16 coils)
Error Check (CRC)
-
7. RS-485 Installation and Set-up
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HVAC Drive Design Guide
142
MG.11.B2.02 - VLT
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