P-NET Channel Structure One of the most important aspects of the P-NET fieldbus, is its integrated use of Channels. A Channel is a set of data associated with a particular…

Virtual Token Passing Each P-NET master is given a node address (NA), between 1 and the number of masters expected within a system. All masters contain an 'idle bus bit…

P-NET in Architecture P-NET is specified and implemented according to the Open Systems Interconnection Reference Model, on layers 1, 2, 3, 4, and 7, as shown in the diagram in…

Ease of P-NET Implementation One of the reasons for the high number of P-NET installations now operating, can be related to the low cost of node implementation. The principle of…

Layer 8 - P-NET Channel Structure Typically, a P-NET Fieldbus device is a sensor, an actuator or an interface module. It can relate to one or more process signals, i.e.…

Intelligent P-NET modules Typical P-NET slave modules give the system integrator more than just Input / Output functions. They very often contain additional process oriented functions varying from simple limit…

Advantages of the P-NET protocol All nodes that conform to the P-NET standard can be directly connected to the bus and will immediately communicate together, because P-NET uses only one…

Multi-net Structures The previously accepted way of designing a network architecture for a factory, was to have the Fieldbus directly connected to the sensors and actuators. The Fieldbus would then…

Principles of P-NET The electrical specification of P-NET is based on the RS485 standard using a shielded twisted pair cable. This allows a cable length of up to 1200 m…

P-NET in General The P-NET Fieldbus is designed to connect distributed process components like process computers, intelligent sensors, actuators, I/O modules, field and central controllers, PLC's etc., via a common…