PLC Controllers

  • PLC Controllers
  • General Information
  • A Programmable Logic Controller (PLC) is a general purpose control that processes analog (temperature) and discrete inputs (such as pressure switch and motor overload) to sequence outputs (such as compressors and hot gas bypass valves).
  • They are in widespread use in both simple machinery and complex production lines.
  • Their appeal is their flexible configuration and field programmability.
  • They are easily networked to provide complete plant-wide information management systems.
  • Application
  • PLC controls can be optionally used to replace the Advantage Multizone III chiller control.
  • The PLC will sequence the compressors, valves and pumps in the same way the MZC III does.
  • The information in the PLC can also be shared with other PLCs and data collection monitors in a plant or cell network.
  • The use of the PLC allows the control logic of the chiller system to be altered in the field.
  • The PLC can be programmed to process information and make control decisions based on this information.
  • Hardware
  • The hardware used in PLC controllers consist of input and output modules for receiving and sending various signals, an information processor (CPU) and an operator interface panel.
  • Input and output modules are added to meet the specific requirement of the system to be controlled.
  • A variety of operator interface panels are available from basic 2 line black and white text displays to color touch screen displays.
  • There are many manufacturers of PLC hardware, including Allen Bradley (SLC-500), General Electric (90-30), Siemans, Square D (Modikon) and others.
  • Programming
  • PLCs need custom programs to operate the equipment they are installed in.
  • Programs are custom written by the user for each application.
  • For chiller or tower systems, Advantage writes a custom program or uses an existing program written specifically for the equipment.
  • A copy of the program is sent with the manual for the equipment when it is shipped.
  • Programming changes can be made in the field using a notebook computer interfaced to the PLC.

For more information about Pump Tank Stations and Pumping Systems call the Advantage Sales Department at 317-887-0729.

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