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CFW-08 OPTIONS AND ACCESSORIES
8.20.2.3.1 Available Functions
and Response
Times
In the Modbus RTU protocol specification is defined the functions used for
accessing different types of registers described in the specification. In the
CFW-08 both parameters and basic variables are defined as being holding
type registers (referenced as 4x). In addition to these registers, it is also
possible to access the internal controlling and monitoring bits directly
(referenced as 0x).
Following services (or functions) are available in the CFW-08 frequency
inverter for accessing these registers:
Read Coils
Description: reading of internal register blocks or coils.
Function code: 01.
Broadcast: not supported
Response time: 10 to 20 ms.
Read Holding Registers
Description: reading of register blocks of holding type.
Function code: 03.
Broadcast: not supported
Response time: 10 to 20 ms.
Write Single Coil
Description: writing in a single internal bit or coil.
Function code: 05.
Broadcast: supported.
Response time: 10 to 20 ms.
Write Single Register
Description: writing in a single register of holding type.
Function code: 06.
Broadcast: supported
Response time: 10 to 50 ms.
Write Multiple Coils
Description: writing in internal bit blocks or coils.
Function code: 15.
Broadcast: supported
Response time: 10 to 20 ms.
Write Multiple Registers
Description: writing in register blocks of holding type.
Function code: 16.
Broadcast: supported
Response time: 10 to 50 ms for each written register.
Read Device Identification
Description: Identification of the inverter model.
Function code: 43.
Broadcast: not supported.
Response time: 10 to 20 ms.
Note: The Modbus RTU network slaves are addressed from 1 to 247.
Master uses address 0 to send messages that are common to all slaves
(broadcast)
8.20.2.3.2 Data Addressing
and Offset
The CFW-08 data addressing is realized with an offset equal to zero that
means that the address number is equal to the register number. The
parameters are available from address 0 (zero) on, whilst the basic
variables are available from address 5000 on. In same way, the status bits
are made available from address 0 (zero) on and the control bits are made
available from address 100 on.
Table below shows the addressing of bits, parameters and basic variables:
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