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▶ How to Control a VFD with a PLC - Part 1 (Configuring ControlLogix 5000 and HMS Anybus gateway):
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▶ 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 3 (Siemens VFD Configuration):
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As you may have learned in previous lessons, automation often requires communication between heterogeneous systems from different manufacturers.
Each manufacturer offers a proprietary or an open form of a communication protocol.
It is the responsibility of the Automation Engineer or Technician to configure devices and develop program logic to communicate between systems.
We have created a series of lessons discussing the steps to configure and program communication between a Rockwell ControlLogix PLC and a Siemens VFD. So stay tuned for the sequence to this lesson.
In this video, we will discuss how a Rockwell Automation ControlLogix 5000 PLC using ControlNet network media and CIP protocol will overall communicate with a Siemens Robicon VFD using Profibus protocol.
However, these two systems will need a device to help translate the two heterogeneous protocols; this device is called a “proxy” or “gateway”. In our example, we will use the Anybus X-gateway AB7803 “PROFIBUS Master” to “ControlNet Adapter” gateway from HMS.
Part 1 of this lesson, will address the configuration of the ControlLogix 5000 PAC to the HMS Anybus gateway.
Part 2 of this lesson will address the HMS Anybus PROFIBUS Master configuration and Part 3, will address the Siemens Robicon PROFIBUS slave configuration.
First, let’s review the overall communication configuration we will perform to allow communication between the “ControlLogix PLC” and “Siemens Robicon VFD” using the “HMS Gateway” used in our example.
The ControlLogix PAC will be controlling a pump with a simple ON/OFF command and its velocity by setting a speed set-point 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.
We have specific addressing for each side of our network;
On the left-hand side of the network, the ‘CIP network’, the ‘ControlNet Master’ or ‘Scanner’ will be addressed as ‘Node 1’ and the ‘HMS Gateway’ will be addressed as ‘Node 3’.
On the right-hand side of the network, the ‘HMS Gateway’ will be the ‘Profibus Master’ and will have the address of ‘1’ and the ‘Robicon VFD’ will have the ‘Slave address’ as ‘3’.
Please note, when beginning a communication project, it is best to look at the big picture and create a spreadsheet with all the tags and data types to be configured at each system.
And we want to point out that the HMS Anybus gateway is not pass-thru but instead acts as a “translator” using an internal shared common database.
Stay connected with RealPars for Part 2 and Part 3 lessons. In Part 2, we will discuss how to configure the HMS Gateway PROFIBUS Master communication to the Siemens Robicon VFD.
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