368 Fieldbus control through the embedded fieldbus interface (EFB)
• CANopen
• Connecting the fieldbus to the drive
• Setting up the embedded fieldbus interface (CANopen)
• Setting the drive control parameters
• Basics of the embedded fieldbus interface
• About the control profiles
• CiA 402 profile
• ABB drives profile
• Transparent 16 profile
• Transparent 32 profile
• Object dictionary
• CANopen status indicators
System overview
The drive can be connected to an external control system through a communication
link using either a fieldbus adapter or the embedded fieldbus interface.
Two protocols are supported by the embedded fieldbus interface: Modbus and
CANopen.
Modbus
Embedded fieldbus is for the following instruments:
• Standard variant ACS380-04xS
• Configured variant (ACS380-04xC) with the I/0 and Modbus extension module
(option +L538).
The embedded fieldbus interface supports the Modbus RTU protocol. The drive
control program can handle 10 Modbus registers in a 10-millisecond time level. For
example, if the drive receives a request to read 20 registers, it will start its response
within 22 ms of receiving the request – 20 ms for processing the request and 2 ms
overhead for handling the bus. The actual response time depends on other factors as
well, such as the baud rate (a parameter setting in the drive).
The drive can be set to receive all of its control information through the fieldbus
interface, or the control can be distributed between the embedded fieldbus interface
and other available sources, for example, digital and analog inputs.
To Next Page
Loading...
