Information as-i (actuator sensor interface). Connection between sensors and actuators. It works as a common path for data transmissions. This connection interface connects the modules that are in the lower levels of the automation process. The bus is made up of two internal cables, one for data exchange and the other for power. It is a bus with very fast response times, between 5 and 10 milliseconds per cycle. Communication is between only 1 master and up to 62 slaves each. Each of these slaves can have between 4 inputs and 4 outputs. Although they can be extended up to
8. It allows up to an installation of 100 meters of cable or up to 300 if repeaters are used. Bitbus. It is one of the oldest field buses that exist. It is used at a e commerce photo editing higher level than as-i. It is used for communication between plc's and automatons. It is based on rs-485 as the transmission system and on sldc (a protocol developed by ibm ) that controls the software development process . You can have up to 250 nodes for each bus segment, 1 of them being the master and the rest slaves. They can be synchronized in two ways, synchronously, where the data uses an additional clock, or self-clocking, where each node has an internal clock that is synchronized with the data.
It can be distributed in basic, tree or multi-level tree structures. It can be installed up to a total of 13.2 kilometers. Profibus, one of the most used field buses. This standard was developed between 1987 and 1990 by bmbf, it is a network standard, which is at higher levels compared to those seen previously. It is vendor-independent and can be applied in virtually any industrial process. It is currently the most used bus. We can divide the profibus topology into 3 different ones. Profibusdp. It is the fastest structure, it is used for communication between