FC101 Design Guide

NOTICE!
Coil addresses start at 0, that is, 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 16–9)
00 (reference = 2000 hex)
Error check (CRC) –
Table 7.26 Query
Response
The normal response returns the slave address, function
code, starting address, and quantity of coils 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) –
Table 7.27 Response
7.10.4 Read Holding Registers (03 hex)
Description
This function reads the contents of holding registers in the
slave.
Query
The query telegram species the starting register and
quantity of registers to be read. Register addresses start at
0, that is, registers 1–4 are addressed as 0–3.
Example: Read parameter 3-03 Maximum Reference, register
03030.
Field name Example (hex)
Slave address 01
Function 03 (Read holding registers)
Starting address HI 0B (Register address 3029)
Starting address LO D5 (Register address 3029)
Number of points HI 00
Number of points LO
02 – (parameter 3-03 Maximum
Reference is 32 bits long, that is, 2
registers)
Error check (CRC) –
Table 7.28 Query
Response
The register data in the response telegram is packed as 2
bytes per register, with the binary contents right justied
within each byte. For each register, the 1
st
byte contains
the high-order bits, and the 2
nd
contains the low-order
bits.
Example: hex 000088B8 = 35.000 = 35 Hz.
Field name Example (hex)
Slave address 01
Function 03
Byte count 04
Data HI (register 3030) 00
Data LO (register 3030) 16
Data HI (register 3031) E3
Data LO (register 3031) 60
Error check (CRC) –
Table 7.29 Response
7.10.5 Preset Single Register (06 hex)
Description
This function presets a value into a single holding register.
Query
The query telegram species the register reference to be
preset. Register addresses start at 0, that is, register 1 is
addressed as 0.
Example: Write to parameter 1-00 Conguration Mode,
register 1000.
Field name Example (hex)
Slave 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 7.30 Query
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HVAC Basic Drive FC 101
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