Analog output module expansion
Here take a 12 bit analog output as an example, the design will use 12 bit D/A conversion chip MAX531 to realize the number of conversion. We then output the operational amplifier at MAX531, micro smart plc ,adjust the analog output to 0 ~ 5V, and output the hardware circuit of the output part as shown in Figure 3. Here, MAX531 is the 12 serial D/A, with a high conversion speed, MAX531 has internal reference voltage, both 10# pin (REFOUT) is 2.048V, so the full range of D/A conversion is 2.048V. And the output signal is a standard 0 ~ 5V, plc input output modules ,therefore, to a level of operational amplifier to max531 output 0 ~ 2.048v signals into 0 ~ 5V signal.