View complete reference designs for selected PLC functions. (Via Pinterest)
Programmable logic controllers are very sophisticated computers that have an architecture suitable for accommodating a large number of input and output signals that are used to sense and control industrial machines and environments. PLCs are available in a wide range of sophistication and cost depending on their control span and the speed at which they must process signals and data. Resilience, power consumption, speed, and accuracy are key factors when selecting ICs for use in a PLC design.
PLC input signals are diverse in number and type, including on/off switches and both large- and small-scale analog signals that can range from millivolts to tens of volts; milliamps to amps. Outputs generally control power devices like actuators, motors, and relays. Design subtleties include reducing latencies, self-test and self-calibration, proper handling of transients, EMI/RFI, voltage faults, and equipment protection circuits to handle wiring errors and any additional extreme environmental conditions to ensure long operating life.
When designing a PLC very specific ICs are required to help your design meet or exceed specifications. Click the blocks above to see how Maxim ICs can provide a design solution for you. In addition, to help speed design efforts we've developed fully characterized subsystem reference platforms for evaluating complete Maxim signal chain and power path solutions.