A digital signal (often called ‘discrete’) is quite simply 0 or 1, like a light that is on or off with no in-between. ![]() The analog signal can exist at any level between those min and max values. Image used courtesy of CanvaĪn analog signal usually comes in the form of 0-10 VDC or 4-20 mA, but other common ranges include 0-5 or -10-+10 VDC, or 0-20 mA. Analog signals and digital signals are both common in industry but are handled by entirely different circuitry. ![]() Digital and analog are presented as opposing options in control systems, for good reason.įigure 1. ![]() Digital control systems (such as PLCs) and microcontrollers operate at a fundamental level with 1’s and 0’s, but in the real world, we have positive and negative, and both very large and very small numbers.
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