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ACS550-02/U2 User’s Manual
Embedded fieldbus
Mapping summary
The following table summarizes the mapping between the ACS550 (parameters and
I/0) and Modbus reference space. For details, see
Modbus addressing
below.
Communication profiles
When communicating by Modbus, the ACS550 supports multiple profiles for control
and status information. Parameter 5305
EFB
CTRL
PROFILE
selects the profile used.
•
ABB
DRV
LIM
– The primary (and default) profile is the
ABB
DRV
LIM
profile. This
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
– The
DCU
PROFILE
profile extends the control and status interface to
32 bits. It is the internal interface between the main drive application and the
embedded fieldbus environment.
•
ABB
DRV
FULL
–
ABB
DRV
FULL
is the implementation of the ABB Drives profile that
standardizes the control interface with ACS600 and ACS800 drives. This
implementation supports two control word bits not supported by the
ABB
DRV
LIM
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
Mapping summary
above. The following sections describe, in
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
CONTROL
WORD
(selected using parameter 5305
EFB
CTRL
PROFILE
). The first 32 coils are reserved for this purpose.
ACS550
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
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