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 setpoint) to be forced.
NOTE!
Coil addresses start at zero, i.e., coil 17 is addressed as 16.
Field Name
Example (HEX)
Slave Address
01 (adjustable frequency drive 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 coils forced.
Field Name
Example (HEX)
Slave Address
01 (adjustable frequency drive 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
VLT
®
AQUA Drive Design Guide
7-22
MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
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