Mapping Summary; Communication Profiles; Modbus Addressing - ABB ACS550 User Manual

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Mapping summary

The following table summarizes the mapping between the ACS550 (parameters and
I/0) and Modbus reference space. For details, see
• Control Bits
• Relay Outputs
• Status Bits
• Discrete Inputs
• Analog Inputs
• Parameters
• Control/Status Words
• References

Communication profiles

When communicating by Modbus, the ACS550 supports multiple profiles for control
and status information. Parameter 5305
•
ABB DRV LIM
implementation of the ABB Drives profile standardizes the control interface with
ACS400 drives. The ABB Drives profile is based on the PROFIBUS interface. It is
discussed in detail in the following sections.
•
DCU PROFILE
32 bits. It is the internal interface between the main drive application and the
embedded fieldbus environment.
•
ABB DRV FULL
standardizes the control interface with ACS600 and ACS800 drives. This
implementation supports two control word bits not supported by the
implementation.

Modbus addressing

With Modbus, each function code implies access to a specific Modbus reference set.
Thus, the leading digit is not included in the address field of a Modbus message.
Note: The ACS550 supports the zero-based addressing of the Modbus
specification. Holding register 40002 is addressed as 0001 in a Modbus message.
Similarly, coil 33 is addressed as 0032 in a Modbus message.
Refer again to the
detail, the mapping to each Modbus reference set.
0xxxx Mapping – Modbus coils. The drive maps the following information to the
0xxxx Modbus set called Modbus Coils:
• bit-wise map of the
PROFILE
Embedded fieldbus
ACS550 Modbus reference
Coils(0xxxx)
Discrete Inputs(1xxxx)
Input Registers(3xxxxx)
Holding Registers(4xxxx)
– The primary (and default) profile is the
– The
DCU PROFILE
–
ABB DRV FULL
Mapping summary
CONTROL WORD
). The first 32 coils are reserved for this purpose.
Modbus addressing
Supported function codes
• 01 – Read Coil Status
• 05 – Force Single Coil
• 15 – Force Multiple Coils
• 02 – Read Input Status
• 04 – Read Input Registers
• 03 – Read 4X Registers
• 06 – Preset Single 4X Register
• 16 – Preset Multiple 4X Registers
• 23 – Read/Write 4X Registers
EFB CTRL PROFILE
profile extends the control and status interface to
is the implementation of the ABB Drives profile that
above. The following sections describe, in
(selected using parameter 5305
ACS550 User's Manual
below.
selects the profile used.
profile. This
ABB DRV LIM
ABB DRV LIM
EFB CTRL