Force/Write Multiple Coils (0F Hex); Read Holding Registers (03 Hex); Preset Single Register (06 Hex) - Danfoss VLT FC51 Design Manual

RS-485 Installation and Set...

8.10.3 Force/Write Multiple Coils (0F hex)

Description
This function forces each coil in a sequence of coils to
either ON or OFF. When broadcasting the function forces
the same coil references in all attached followers.
Query
The query message specifies the coils 17 to 32 (speed set-
point) to be forced.
Field Name
Follower Address
Function
Coil Address HI
Coil Address LO
Quantity of Coils HI
Quantity of Coils LO
Byte Count
Force Data HI
(Coils 8-1)
8 8
Force Data LO
(Coils 16-9)
Error Check (CRC)
Table 8.25 Query
Response
The normal response returns the follower address, function
code, starting address, and quantity of coils forced.
Field Name
Follower Address
Function
Coil Address HI
Coil Address LO
Quantity of Coils HI
Quantity of Coils LO
Error Check (CRC)
Table 8.26 Response

8.10.4 Read Holding Registers (03 hex)

Description
This function reads the contents of holding registers in the
follower.
Query
The query message specifies the starting register and
quantity of registers to be read. Register addresses start at
zero, that is, registers 1-4 are addressed as 0-3.
Example: Read 3-03 Maximum Reference, register 03030.
78
®
VLT Micro Drive FC 51 Design Guide
Example (hex)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
02
20
00 (ref.=2000 hex)
-
Example (hex)
01 (frequency converter address)
0F (write multiple coils)
00
10 (coil address 17)
00
10 (16 coils)
-
MG02K302 - Rev. 2013-12-03
Field Name Example (hex)
Follower Address 01
Function 03 (read holding registers)
Starting Address HI 0B (Register address 3029)
Starting Address LO D5 (Register address 3029)
No. of Points HI 00
No. of Points LO 02 - (3-03 Maximum Reference is 32 bits
long, i.e. 2 registers)
Error Check (CRC) -
Table 8.27 Query
Response
The register data in the response message are packed as 2
bytes per register, with the binary contents right justified
within each byte. For each register, the first byte contains
the high-order bits and the second contains the low-order
bits.
Example: hex 000088B8=35.000=35 Hz.
Field Name
Follower Address
Function
Byte Count
Data HI (Register 3030)
Data LO (Register 3030)
Data HI (Register 3031)
Data LO (Register 3031)
Error Check (CRC)
Table 8.28 Response

8.10.5 Preset Single Register (06 hex)

Description
This function presets a value into a single holding register.
Query
The query message specifies the register reference to be
preset. Register addresses start at zero, that is, register 1 is
addressed as 0.
Example: Write to 1-00 Configuration Mode, register 1000.
Field Name Example (hex)
Follower Address 01
Function 06
Register Address HI 03 (Register address 999)
Register Address LO E7 (Register address 999)
Preset Data HI 00
Preset Data LO 01
Error Check (CRC) -
Table 8.29 Query
Example (hex)
01
03
04
00
16
E3
60
-