Profibus is a field bus system which was developed in Germany ub rgw `9809a. It is multi-vendor and inter-operable and complies with IEC 61158. .
There is Profibus DP (decentralized peripherals) and Profibus PA (process automation).
Profibus provides a means of automation via de-centralised input / outputs. Compared with traditional, hard-wired systems, the use of Profibus provides:
There are other important benefits for OEMs and automation projects which use Profibus.
The Profibus system is very flexible. It allows the coupling of Profibus DP to Profibus PA to form a combined network.
Profibus PA may be used in hazardous areas in accordance with the FISCO concept (Field Bus Intrinsically Safe Concept). FISCO is defined in AS/NZS 60079.27:2008. It is a global technique for an intrinsically safe field bus. FISCO systems are predominately used in zone 1 and zone 2 locations.
Profibus DP uses an RS485, twisted-pair, shielded bus cable. The cable installation may be tested independent of having a master controller connected. Similarly, the network may be addressed and proven independent of a master controller. Fibre optic cables may be used for where long distances are required or where electrical interference is a problem.
Profibus PA uses a Manchester bus, powered network that provides a field bus solution for process automation systems with field devices such as transmitters, converters, positioners and sensors. It allows the instruments to be configured and monitored via the field bus. Profibus PA was developed in co-operation with the Control and Process Industry (NAMUR), in compliance with the special requirements of this industry.
The Profibus network may have more than one master. The slaves in the network can be independently assigned to a particular master.
This allows the use of PROFIsafe. PROFIsafe is a safety communication technology for distributed automation. It can be used in safety applications up to Safety Integrity Level 3 (SIL) in accordance with IEC 61508 or Category 4 in accordance with EN 954-1. PROFIsafe is a separate layer on top of the fieldbus application layer, to reduce the probability of data transmission errors. PROFIsafe complies with IEC 61784-3-3.
As a field bus system, the reliability of the system is dependent on the quality of the network design, the quality of the installation and the competency of the set-up and commissioning. BESST can provide the system design for Profibus networks and can assist with the installation and commissioning of Profibus networks.