Industrial Data Xchange (IDX) presented at the August Technology Evening on the topic “What is new from Profibus and Profinet International?”
What is Profibus? Simply put, it is a digital communication system used in automation.
According to IDX’s Michael Garnham, digital communication is the way of the future and the reasons for this are:
• Analog signals can get corrupted by noise or signal attenuation, whereas digital signals can be accurately defined even though there is a noise effect.
• Hardwired analog signals can only send one value at a time whereas digital systems can send multiple pieces of information at once.
Johan Maritz (right) thanks Michael Garnham after the presentation.
Electromagnetic Compatibility (EMC) is very important when it comes to Profibus. The following is a list of guidelines to prevent electrostatic/electromagnetic interference on Profibus systems:
• Keep profibus cables separate from other cables (the distance between the cables will depend on the voltage on the cables).
• Shield/screen cables, and remember that the shield needs to be earthed.
• Use steel cable trays to minimise electro-magnetic interference and remember to earth the cable trays.
• Earth the Profibus cable at both ends.
• Avoid running Profibus cables close to motor cables. If this is not possible, use any of the following screening methods on the motor cables: copper braid/tape; steel braid; solid copper cladding or aluminium tape armour,
• Cables between drives (VSD) and motors can carry high currents, in such cases use symmetric cables and remember to earth them.
In summary, it seems like Profibus and Profinet might be the way of the future, but there is still a long way to go in replacing the current analog systems on existing plants. Furthermore, it seems like installation of Profibus systems on existing plants can become an issue due to the fact that they need to be installed as a complete separate system in order to avoid EMC.
SAIMC: Vaal branch December 2019, SAIMC
At the last technology evening, Robert de Scande from SICK Automation gave a presentation on the subject of IO-Link. IO-Link offers new options for communication between the system control and field levels: ...
Read more...SAIMC: Durban branch December 2019, SAIMC
, SAIMC Technology evening
At the last technology evening, Beckhoff Automation’s Gareth Taylor (sales engineer, Durban) presented on the topic ‘Open PC-based control technology in a world of modular process ...
Read more...SAIMC: Secunda branch December 2019, SAIMC
At the technology evening on 10 October, Jacques Parrott, from SICK Automation SA gave a presentation on ‘Measurement of green house gas emissions’, which also touched on the issue of carbon tax.
Read more...SAIMC: Johannesburg branch December 2019, SAIMC
The October technology evening was hosted by Extech Safety Systems. Sales director Gary Friend presented an interesting take on the relationship between new technological advances, and the never-ending ...
Read more...SAIMC: From the President's desk December 2019, SAIMC
2019 has been a year of many achievements by our members. Although the SAIMC might not be the organisation with the most members, the unselfish and hard-working team have certainly achieved more than ...
Read more...SAIMC: From the President's desk November 2019, SAIMC
The end of the year is almost upon us. Have you taken the opportunity to ask yourself what has really changed for you this year? In some areas we have seen significant and exponential change. Automation ...
Read more...SAIMC: Tshwane branch November 2019, SAIMC
, News Industry expert talks about importance of continuous learning
Learning from industry experts is a vital component of any student’s training. Such an expert is Thabo Lekgowane, a robotics engineer from ...
Read more...SAIMC: Obituary - Eugene Sithole November 2019, SAIMC
It is with deep sadness that the SAIMC heard of the death of dear friend and esteemed colleague Eugene Sithole, who passed away suddenly on 7 September.
Thanduxolo Eugene Sithole was born on 13 September ...
Read more...SAIMC: Johannesburg branch November 2019, SAIMC
, SAIMC Why use wires? At the technology evening on 11 September, Rudi Erasmus of Phoenix Contact walked us through when and why wireless communication is preferred to cabled communication.
Read more...SAIMC: Vaal branch November 2019, SAIMC
This month’s presentation at the Vaal branch covered the basic principles and fundamentals of SIL. It included the common misconceptions about SIL, risks, accidents, processes, random and systemic failures ...