Applicable cables • Use AWG26 ~ 16 for connection with input.
• Tighten the terminals to a torque of 0.5 ~ 0.6 Nxm. Do not tighten terminal screws exceeding the specified torque. Failure to do so may cause equipment failures or malfunctions.
When using a different type of cable, defective contact at the terminal is possible. Use a crimp terminal to achieve a good contact.
Analog amount (0 ~ 10V, 4 ~ 20mA) input to each channel is stored in data registers (D8112, D8113) as digital values. The values are stored automatically at each END instruction and calculated using the analog to digital conversion characteristic, specified with special auxiliary relays M8112 and M8113.
Basic Example Program
Note: • Drive M8112 and M8113 which specifies the analog to digital conversion characteristic with M8000 (“a” type contact of the RUN monitor) or M8001 (“b” type contact of the RUN monitor). Do not change the ON/OFF state while the analog to digital conversion is operating. The analog to digital conversion is not executed correctly when M8112 or M8113 are turned ON and OFF during the conversion process. • Do not change the digital value of D8112 or D8113 after A/D conversion in the 2AD, by manipulating the user program, a programming tool, or GOT (graphic operation terminal), etc. The following program example sets Ch1 in the voltage input mode, Ch2 in the current input mode, with the A/D converted digital value of each channel stored in D0 and D1.
Example Application Program
As the 2AD does not have Offset and Gain capabilities, if values are required outside the standard specification range, additional program commands are required to either multiply or divide the conversion values. For an example application, please see FX programming manual II. Note: • Accuracy and resolution of the analog to digital conversion are different from the specification because the additional program commands. • The original range of the analog input is not changed.
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