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The elements of all industrial control systems are similar. All are I/O intensive, consisting of hundreds to thousands of input and output channels depending on the size and the complexity of the system. Analog input sensor modules measure numerous types of physical parameters such as temperature, pressure, flow, vibration or even motion through various types of sensors. Each sensor output has different characteristics requiring unique sensor conditioning circuits. Often, the accuracy of the system depends on the design and component selection of the sensor input circuits. Analog output modules receive data from the control unit and convert it to appropriate drive signals for various types of control devices. These can be valves, power switches, motor control drives, or safety devices. The specific voltage or drive currents are designed to be specific to the individual control device. Communication modules are typically serial interface ports using RS485 transmitters and receivers and using a variety of communication protocols. Fieldbus, Profibus, HART, Modbus, Ethernet, and BACnet are common interface protocols. All control systems require numerous power solutions to drive the digital subsystems and the various analog I/O needs. The specific needs will vary depending on the control unit function and associated I/O hardware. Common to all systems however are the continuous drive for higher accuracy, more channels and a smaller size. This means there is an ongoing need for high precision, low drift, low power products in small packages.
