1. Analog signals can collect physical quantities such as temperature, force, and vacuum; the analog signals can be 0~5V, 0~10V, ±5V, ±10V, 0~20mA, 4~20mA, etc.
2. For analog conversion, taking the Mitsubishi FX5U series PLC as an example, a force sensor with a range of 0 to 200N corresponds to 0~10V (with a corresponding digital value of 0~32000) or 0 to 200N corresponds to 4~20mA (with a corresponding digital value of 0~32000). Using the formula y=kx+b (Point 1: y1, x1; Point 2: y2, x2), where y represents the force value and x represents the digital value, we can calculate k and b using the two-point method, and thus determine the actual force value.