Digital PID controllers have replaced most pneumatic and electronic analog controllers in industrial control applications. Digital PID controllers are preferred over the analog types because they employ microprocessors which can execute multiple functions at ago hence they bring with them many advantages in addition to their ability to network with PC workstations and other controllers over wired or wireless networks.
Digital PID controllers can exchange data over digital networks like Ethernet; this provides operations and maintenance personnel the ability to remotely monitor and in some cases control (i.e. adjust setpoint, switch modes, change tuning parameters, etc.) on the process controller from a computer workstation.
Related: Basic Features of Distributed Control Systems (DCS)
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