Wireless I/O Application

On high-speed rotary bottle filler machines, typically the I/O from the upper section is passed through a slip ring. Slip rings have proven to be problematic over time due to the harsh wash down environment. Slip rings are also very limited in the number of analog signals that can be transmitted. On one machine a wireless I/O solution was implemented successfully. The I/O consisted of 4-20mA analog input signals from each of four Turck transmitters for level, temperature, pressure, and flow and outputs to activate solenoid valves. The I/O was passed through a Wago fieldbus I/O rack with an Ethernet/IP passive bus coupler. The fieldbus coupler was connected to the main PLC via Banner wireless Ethernet radios. With this system, the I/O is virtually unlimited and very reliable as the entire system is mounted inside of a Nema 4X enclosure.


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