Functions

Basics of data acquisition and evaluation

The measuring functions of the EL5072 can be described as follows:

• The alternating voltage is fed into the measuring probe via the connection points U_exc+ and U_exc.
• The excitation frequency (0x8001:14 "Excitation frequency") and
  the excitation voltage (0x8001:15 "Excitation voltage") can be set via the CoE objects. The setting simultaneously applies to both channels.
• First switch on the supply voltage (0x8000:08 "Enable excitation"). It is switched off in the delivery state.

• In the EL5072 the measuring principle is defined via:
• the selection of the connection (0x80n1:12 "Connection type") and the
• input impedance for the sensor (0x80n1:13 "Sensor impedance").
• For the maximum input voltage to be measured, the internal gain factors are determined from the information provided below. This automatically adjusts the measuring signal range.
• Excitation voltage (0x80n1:15 "Excitation voltage"),
• Sensitivity (0x80n1:16 "Sensitivity"),
• Maximum measuring range of the measuring probe (0x80n1:18 "Overall sensor range")
• 
• Depending on the measuring probe version, the measuring voltage is measured via the connection points U_sig and U_sens.

• The measured value is output in the process data 0x60n1:01 "Position" in the unit nm.

Note
	Observe the notes on application and parameterization For correct measured value output, parameterize the EL5072 according to the measuring probe used, as described in chapter Parameterization for evaluation of the measuring probe. During commissioning observe the Application notes on measurement deviations!

Data flow