Commissioning/Configuration
EP3204 and EP3314
34
Version: 2.2
6
Commissioning/Configuration
6.1
Configuration in TwinCAT
An EtherCAT Box must be configured in TwinCAT so that its functions can be used in a PLC program.
The following link will take you to a quick start guide describing the configuration of an EtherCAT Box in
TwinCAT:
https://infosys.beckhoff.com/content/1033/epioconfiguration/index.html?id=6991403443235907429
6.2
EP3204 – Data stream and calculation of the process
data
6.2.1
Vendor calibration
6.2.1.1
2 and 4-wire resistance measurement
Whether a measurement is executed as a 2 or 4-wire measurement is determined by the connection points
at which the measurement takes place. A comparison value is stored in the firmware for both measuring
methods.
•
With the 2-wire measurement
◦ a current is applied between the contact points RL+ und RL- and the voltage drop is measured in
order to determine the resistance.
◦ The parasitic line resistance cannot be determined by the box itself, but must be entered as a
correction value in the CoE register 0x80n0:1B.
•
With the 4-wire measurement
◦ the sensor current is applied between the contact points RL+ und RL- of the M12 socket and the
voltage drop at the contact points R+ and R- is used to measure the resistance.
◦ The conducting wire is thus not part of the measuring circuit and is not incorporated into the
measurement as a source of error.
Fig. 22: Resistance measurement with a 4-wire, 3-wire and 2-wire connection technique
Содержание EP3204
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