
352 Fieldbus control through the embedded fieldbus interface (EFB)
System overview
The drive can be connected to an external control system through a communication
link using the embedded fieldbus interface.
Modbus
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.
Embedded fieldbus and external control panel mode switch
ACS180's embedded fieldbus and external control panel shares same port internally
and can be switched by a jumper. You can't use external panel together with
embedded fieldbus. If you have the EFB communication enabled in the drive, but
need to change to a communication with an external panel temporarily, do these
steps:
1. Power-down the drive, wait 5 minutes.
2. Place the jumper to "panel mode".
3. Connect the external panel onto the drive.
4. Power-up the drive.
5. The drive can identify the panel automatically and you can use the external panel
as normal. Be noted that at this moment the EFB can not work.
6. After works done, power-down the drive.
7. Disconnect external panel from the drive.
8. Place the jumper J2 to "Modbus Mode".
9. Power-up the drive.
Connecting the fieldbus to the drive
Connect the fieldbus to the EIA-485 Modbus RTU terminal on control connectors
which is on the front of the drive. The connection diagram is shown below. ACS180
has a jumper J2 on front of the drive to switch between EFB mode and external
ACS180 FW.book Page 352 Tuesday, March 9, 2021 2:25 PM