How to Control a VFD with a PLC - Part 2 (Configuring HMS Anybus gateway and Siemens Robicon VFD)

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▶ How to Control a VFD with a PLC - Part 1 (Configuring ControlLogix 5000 and HMS Anybus gateway):
https://realpars.com/connect-vfd-to-plc

▶ How to Control a VFD with a PLC - Part 2 (Configuring HMS Anybus gateway and Siemens Robicon VFD):
https://realpars.com/hms-anybus/

▶ How to Control a VFD with a PLC - Part 3 (Siemens VFD Configuration):
https://realpars.com/siemens-vfd/

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Welcome to Part 2 of Rockwell ControlLogix PLC and Siemens VFD Communication.

As you have learned in part one (https://realpars.com/connect-vfd-to-plc/), automation often requires communication between two heterogeneous systems from different manufacturers.

In this video series, overall, we are communicating from a Rockwell Automation ControlLogix 5000 PLC using ControlNet network media with CIP protocol to a Siemens Robicon VFD using Profibus protocol, through a gateway converting ControlNet CIP protocol to Siemens Profibus protocol.

As a prerequisite, please watch Part 1 of this video series, addressing how the communication between ControlLogix 5000 PLC and the HMS Anybus gateway is configured. (https://realpars.com/connect-vfd-to-plc/)

In part 2, this video, we are going to discuss how the HMS Anybus PROFIBUS Master gateway is configured to communicate with the Siemens Robicon VFD.

Finally, the third and last part will address the Siemens Robicon PROFIBUS slave configuration.

The ControlLogix PLC will be controlling a pump with a simple ON/OFF command and velocity by setting a speed setpoint to the VFD.

In response, the Siemens VFD will return the actual speed reference and VFD status information controlling the pump.
This exchange of control data and status information is all performed by the HMS gateway.

The HMS Gateway also performs an important responsibility as PROFIBUS Master controlling the Pump VFD.

First, let’s review what the PROFIBUS master is responsible for. The PROFIBUS master controls the entire communication dialog with the salves on the network.

The master writes and reads data from each slave one at a time. Each slave is required to respond to the request within a predetermined timeframe or the master will report a communication error.

Configuring the PROFIBUS Master in the gateway is accomplished by using HMS NetTool software.

The HMS PROFIBUS configuration is set to use 30 bytes of input for real I/O data and status data for ControlLogix PLC and 6 bytes of output to be controlled by the ControlLogix PLC respectively.

Using a null modem cable, we will connect to the COM port on a laptop and the COM port on the Gateway marked “PROFIBUS Config Connector”.

Next, in Part 3, we will discuss how to configure this input/output data in the Robicon VFD.

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