A PLC may be used to control the operation of a medium-voltage motor, perhaps 2,300V or 4,160V. A relay is used to energize the starter, which, in turn, switches the motor voltage while the PLC ...

The New Programmable Control Unit (PCU) Bridges The Technology Gap Between Safety Relays and PLC Systems For Machine Builders/Users/Equipmetn OEMs Related To: Tapeswitch Corporation The New ...

Remote pump station in the water and wastewater industry generally consist of—at a minimum—an overload relay to protect the pump motor and a small PLC to control and monitor the system. The ...

Higher amperage relay output modules and an 8-point input simulator module are now available from ... AutomationDirect Click PLC units, starting at $69.00, are low-cost, brick/stackable PLCs with the ...

The PuffinPLC Project is an effort to produce a Linux-based GNU Public Licensed Programmable Logic Controller (PLC). PLCs were developed in the 1960s to replace the complex electrical relay circuits ...

But while control systems based on relays, timers, and analog instruments were often cheaper than PLC-based systems in terms of component costs, they were fiendishly complex to design, test ...

William Shelley began his utility career with SCE in 1970. After seven years as a protection and control technician, he left the utility to start his own company, S&W Technical Services Inc. He ...

Designed to interface PC or PLC logic to machines, the Releco Interfacer universal relays pack both ac and dc circuits in the same unit and include a built-in surge supressor. Dedicated ac or dc ...