The higher the transmission speed, the less cable length can be installed per segment.These cable lengths per baud rate are defined in the PROFIBUS standard.
A PROFIBUS user has to fully grasp these guidelines, as changes in cable length or baud rate have consequences for each other. If an alternative cable is changed, then the above table does not apply and the long term consequences with regards to reliability cannot be guaranteed. It is recommended to maintain a distance of one meter between two devices with baud rates of 1.5 Mpbs. This is indicated in the data sheets of cable manufacturers. The repeaters functionality makes it possible to start a new segment in which the cable length can be applied, including the 31 devices (number 32 is the repeater itself). With the training, you can overcome frequently made architectural mistakes. ![]() This allows all automation devices, sensors, actuators, PLCs, etc to communicate with each other over a single bus. PROFIBUS solutions include cordsets, receptacles, field-attachable connectors, PC and PLC interfaces, diagnostic tools and simulation software. Applications include supervisory HMI messaging, real-time control, bridging networks and devices, physical connections in harsh environments and IO communications. ![]() ![]() The data connectivity is complemented with T-Splitters to connect the bus to the active modules and 9 pin D-sub connectivity with other PROFIBUS compatible devices. Power is supplied to the active modules via a 5 pole Mini-Change connector. Two of the contacts are used to provide power to the modules electronic circuits and any input devices such as proximity switches. A separate and isolated power circuit is provided via another two contacts. This is used for output devices only and is not required on input-only modules. This second supply should be controlled via the machines safety systems to ensure that no outputs are activated during operator interface with the machine.
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