ACH550 E-Clipse Bypass User’s Manual 2-175
Embedded fieldbus
Mapping summary
The following table summarizes the mapping between the system (parameters and I/
0) and Modbus reference space. For details, see Modbus addressing below.
Communication profiles
When communicating by Modbus, the drive supports multiple profiles for control and
status information. Bypass parameter 5305 (
EFB CTRL PROFILE) selects the profile
used. If bypass parameter 1625 = (1) SYSTEM then the drive and bypass profile are
fixed ABB BYPASS PROFILE. See section Bypass Overview for ABB BYPASS
PROFILE
•
ABB DRV LIM – The primary (and default) profile is the ABB DRV LIM profile, which
standardizes the control interface with ACH400 and ACH550 drive. 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. It extends the control and
status interface to 32 bits.
•
ABB DRV FULL – This profile standardizes the control interface with ACS600 and
ACS800 drive. This profile is also based on the PROFIBUS interface, and
supports two control word bits not supported by the
ABB DRV LIM profile.
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 drive 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 bypass maps the following information to the
0xxxx Modbus set called Modbus Coils:
ACH550 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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