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Micro PLCs optimise standalone performance & cost

25 April 2013

Meeting machine builders’ demands for flexible micro programmable logic controllers (PLCs) that optimise standalone machine performance and cost, Rockwell Automation has launched the new Allen-Bradley Micro850 and enhanced Micro830 PLCs.

Both micro PLCs feature embedded motion capabilities for up to three axes of motion, allowing them to support a wide range of applications. The Micro850 micro PLC is equipped with the same form factor, plug-in support, instruction/data size and motion capabilities as the 24-pt and 48-pt Micro830 controllers, but with the added capabilities of Ethernet and expansion I/O.

The Micro850 controllers have an embedded Ethernet port for higher performance connectivity to human- machine interfaces (HMIs). The EtherNet/IP protocol with CIP Symbolic support is used for simplified Allen-Bradley PanelView Component HMI connectivity. Tags created while configuring the HMI screens can easily reference the variable names in the Allen-Bradley Micro800 program.

I/O flexibility in the Micro850 PLC is one of the keys to successfully minimising the cost of a machine. With support for up to five plug-ins, machine builders can customise the functionality of the controller with additional I/O, special functions, and serial ports without increasing the physical size of the controller. If more I/O or higher-performance analogue I/O is required, the Micro850 controller supports up to four side-expansion I/O modules, including high-density digital I/O and high-accuracy analogue I/O, for a total of 132 digital I/O points.

The enhanced Micro830 (via a firmware and software upgrade) and Micro850 controllers support up to three motion axes using pulse output to stepper or servo drives. Intuitive motion function blocks, including Home, Move Velocity, Move Absolute, and Move Relative make single-axis moves easy.