This example demonstrates how to use the two analog adjustments (potentiometers, or POTs) of the SIMATIC S7-200 CPU. The positions of the potentiometers are converted into digital values between 0 and 255. The value for analog adjustment 0 is stored in special memory byte SMB28; the value for analog adjustment 1 is stored in special memory byte SMB29. A small screwdriver is required to adjust the positioning. This application tip demonstrates three ways to use an analog potentiometer to adjust the Preset Time (PT) of a timer.
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发表于 2008-5-4 08:11:00
