Top 5 of basic PROFINET tips
19 April 2016
‘Oy mateys and scallywags! Remember to keep to the Code? Or do you agree with “the Code is more of what you’d call guidelines than actual rules”? In Pirates of the Caribbean we either identify with Captain Jack Sparrow honoring the Pirate’s Code, or Captain Barbossa reading between the lines.
We as engineers keep to a Code too, although we call them the PI-Guidelines. Every once in a while though, we slip up and forget to strictly keep to the Code. However, the PI-Guidelines are not so open to interpretation as one would think.
To refresh your memory a bit, our support engineer Lorenzo Fattori gives you a top 5 of basic PROFINET tips on cabling, connectors, grounding, topology and labels.
TIP 1: CABLING
Power and drive cables too close to the signal cable can cause EMC disturbance which may affect PROFINET communications.
- Separate the power from the signal cables as much as possible. PI suggests to keep a minimum distance of 20 cm between PROFINET and unshielded power supply cables.
- Use different cable trays or use metallic separators. When you choose a metal cable tray, make sure that it is correctly grounded.
TIP 2: CONNECTORS
Connectors are a strategic part of networking; bad connectors may cause problems in communications.
* Use certified connectors! Standard RJ45s are not suitable for industrial environments.
* Follow instructions for assembly and use the correct PROFINET strip tools.
TIP 3: GROUNDING
Good grounding is necessary for avoiding communications interference on cables and devices. Cables and cable trays must be grounded in all major points possible.
- It is highly recommended to ground PROFINET cables at the entrance of the cabinets as shown in the picture.
- Establish a connection between the cable shield and the equipotential bonding bar.
- Metallic cable trays must be grounded too, as using metallic separators without grounding them is as if you’re not using them at all.
TIP 4: TOPOLOGY
Consider the best topology during the design of the line. Sometimes line topology can create communication problems due to network load
* Remember that in case of line topology you will lose all devices if one of them stops working or when other communication problems arise.
* Use managed switches. The use of managed switches is helpful for getting information about the status of the network and can help us setting up a mirror port for diagnosis and troubleshooting.
TIP 5: LABELS
Cables must be labelled, and labels must be according to schematics and easy to understand to identify and localize cables.
* Provide complete and updated schematics. Often times schematics are not kept up to date when adjustments have been made in the field.
* PROFINET names, IP addresses and subnets must be chosen correctly and included in documentation and schematics. In the end…
So Captain Barbossa, this little fresh-up on PI-guidelines might have left you wanting. For a complete PI submersion, follow a training course at our PI Competence Center with your fellow scallywags and deck scrubbers.
Worried about possible disturbances in your network or interested in a complete checkup, contact our specialized crew for an audit! Who knows where your PROFINET ship might lead you next?
Ps. If you have specific questions about this article or concerning PROFINET, please e-mail your questions to: firstname.lastname@example.org.
PROCENTEC is a knowledge partner in the field of PROFIBUS and PROFINET technology and develops products and services aimed at optimizing end users’ industrial automation networks. Through a worldwide network of local offices and distributors, PROCENTEC supplies the key components required for the installation of a measurable and manageable network. Its innovative, tailor-made solutions allow PROCENTEC customers to operate successfully in the field of industrial automation and maximize their process returns. In addition, PROCENTEC is an internationally accredited Competence and Training Centre for PROFIBUS and PROFINET. PROCENTEC organizes training courses which help employees to optimally deploy these technical systems for their operational objectives. Also PROCENTEC offers end users the necessary support during implementation procedures, certification processes, audits and technical faults.
PROCENTEC certified professionals are always on standby to consult their customers about the optimal solution for their specific needs. They have over 20 years of experience with PROFIBUS and PROFINET technology.