FAQ: How is the MP940 analog input used?
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The MP940 analog input is actually wired into the SGDH amplifier [1CN pin 5 (VREF) and pin 6 (SG)], but there are registers available in the MP940 to read the value of that input. These I/O variables are listed in MW+ as "Sigma_Analog_Input" (also available in MotionWorks at address IW0001) and "Sigma_Analog_Input_Voltage". "Sigma_Analog_Input" is an integer word that has a value between -32768 and 32767, while "Sigma_Analog_Input_Voltage" is scaled as a floating point number to reflect the actual input voltage (-12.0 to +12.0). A voltage reference exceeding 12V will cause "Sigma_Analog_Input_Voltage" to be a value of 12.0 volts.
Example usage: A customer wants to control the jog speed of his motor with the analog input. The jog speed should vary from -MaxSpeed to +MaxSpeed (MaxSpeed is a variable). To accomplish this, set the jog block's speed property as "Sigma_Analog_Input / 32768 * MaxSpeed". The first half of this expression (Sigma_Analog_Input / 32768) will scale the voltage so it returns a value of -1 to 1, and multiplying this result by MaxSpeed will make the jog speed vary from -MaxSpeed to +MaxSpeed as desired.
Note: The analog input can actually accept a signal up to 15VDC, but the analog-to-digital conversion is linear only to -12 to +12 volts. The following document explains this further.
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