Industrial Data Xchange (IDX) is a South African based IT industrial company with a global focus specialising in the provision of data communication solutions. On this blog, IDX experts comment on industrial communication protocols, trends, and tips as well as what is on the go in the labs at IDX.
I often have people asking for a copy of my slides from a Profibus Diagnostics Seminar that we gave at the Eskom convention centre last year. I got the last slot of the day so I ended up speaking to only 40 people or so.
If you missed it you can have a look at the slides here.
Last week IDX were called to site at a large commercial residence building in Pretoria, South Africa. Where our client was implementing an IoT solution for remote monitoring and control of various HVAC and power systems in the building. The control system the SI chose in this case was a Modbus enabled Industrial Micro PC called the Revolution PI. The client had Modbus sensors connected to boilers, air conditioning systems, ventilation systems and power meters. The Modbus communications between the controller and the sensors were intermittently failing due to various installation and implementation faults:
1. Earthing and Shielding Within any fieldbus communication installation, one of the requirements to ensure uninterrupted operation is to implement adequate grounding and shielding techniques. Effective grounding and Shielding help to prevent electrostatic and electromagnetic pickup, which can lead to failed communications.
Some of the shielding and grounding requirements for a Modbus RS4…
In this blog, I will discuss the steps involved in getting the Netbiter to record and display values coming out of the ComAp Generator Panel, so that one can do remote monitoring and control of the generator. The Netbiter Model used in this case is the EC220 and the panel used is the InteliLite AMF 26 P. The steps followed here can be applied to any MODBUS device due to the generic nature of the Netbiter.
Step 1 - Physical Connection Check that the Control Panel has a communication module attached to the back of it. You will need to establish the medium (RS458/RS232) and the protocol spoken (MODBUS RTU/ASCII) - all of this information will come from the user manual of the generator. Finally confirm the communication settings (baud rate, parity, stop bits, etc) - these can sometimes be changed so check what they are on the actual panel. In this case, we have the following settings: MOUBUS RTU over RS232 (you'll need an external converter to convert the RS232 to RS485). Baud rate: 9…
Time to dust off the cobwebs and do some "legacy" development! In this blog, I'm going to show you how to get to a point where you can start writing Java code on the HMS Anybus Communicator. I find that it doesn't matter what language you code in, the tricky bit is getting to the point where you can simply create and run the time-honoured "Hello World!" program. Using new editors, sorting out dependencies, making physical hardware connections can take up a big chunk of your time.
First, some information on the hardware platform: The Anybus brand from HMS contains hundreds of gateways (or protocol converters) that can be used to convert between common industrial communications protocols such as PROFIBUS, MODBUS, Ethernet/IP, ControlNet, DeviceNet, PROFINET, CANOpen, J1939, etc. Check out anybus.com for a full list of protocols supported out of the box. Using these gateways you can for instance read registers from a MODBUS device and make them available to a PR…