Fieldbus control 337
Mapping summary
The following table summarizes the mapping between the ACS320 (parameters and
I/0) and Modbus reference space. For details, see section Modbus addressing below.
Communication profiles
When communicating by Modbus, the ACS320 supports multiple profiles for control
and status information. Parameter 5305 EFB CTRL PROFILE selects the profile
used.
•
ABB DRV LIM – This profile is based on the PROFIBUS interface, and is discussed
in detail in the following sections.
•
DCU PROFILE – Another profile is called the DCU PROFILE profile. It extends the
control and status interface to 32 bits, and is the internal interface between the
main drive application and the embedded fieldbus environment.
•
ABB DRV FULL – This profile is also based on the PROFIBUS interface, and
supports two control word bits not supported by the
ABB DRV LIM profile.
Write Multiple
Holding Registers
0x10 Write multiple holding registers. For the ACS320, the entire
parameter set is mapped as holding registers, as well as
command, status and reference values.
Read/Write
Multiple Holding
Registers
0x17 This function combines functions 0x03 and 0x10 into a single
command.
ACS320 Modbus Reference Supported Function Codes
• Control Bits
• Relay Outputs
Coils(0xxxx) • 01 – Read Coil Status
• 05 – Force Single Coil
• 15 – Force Multiple Coils
• Status Bits
• Discrete Inputs
Discrete Inputs(1xxxx) • 02 – Read Input Status
• Analog Inputs Input Registers(3xxxxx) • 04 – Read Input Registers
• Parameters
• Control/Status
Words
• References
Holding Registers(4xxxx) • 03 – Read 4X Registers
• 06 – Preset Single 4X Register
• 16 – Preset Multiple 4X Registers
• 23 – Read/Write 4X Registers
Function
Code
(Hex)
Description
To Next Page
Loading...
