YOKOGAWA VZ20X, User Manual

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IM 77V01B01-01EN 5th Edition: 2023.03.07-00
1.4 Basic Functions
The following describes the basic functions of the VZ20X.
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Measurement
Inputs from thermocouples, resistance temperature detectors, DC voltage, resistance,
and other inputs can be measured at a fast sampling period of 1 ms.
Signals input to the VZ20X are sampled every 1 ms and then A/D conversion is
performed. The resulting values then become the measured value of a channel. 10 ms,
50 ms and 100 ms can also be selected as the data acquisition interval for acquiring
measured values in addition to 1 ms.
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Communication
The VZ20X has two Ethernet ports. These are used for connecting to a host device such
as PC/PLC, etc which perform data acquisition and for connecting multiple VZ20X's.
Multiple VZ20X's can also be connected without the need to use a general-purpose
Ethernet hub.
When connected to the GA10, data can be acquired without the need to prepare a
special program. When connected to a PC/PLC, data can be acquired by creating a
program. In this case, Modbus/TCP is used as the communication protocol.
The parameter settings, monitoring and input adjustment can be made by VZ
Configurator via Ethernet communication or USB communication.
●
Time synchronization
Time synchronization is performed between VZ20X's connected in a daisy chain
configuration. Time synchronization between VZ20X's connected in this way enables
measurement values to be acquired on up to 120 channels*
1 at the same A/D
conversion timing.
*1: The number of connected devices may be limited depending on the performance and operating environment (OS,
CPU, installation software, programming, etc.) of the PC (including GA10 Data Logging Software) and PLC.
DC voltage
Temperature
(sensor)
Resistance
Sampling
Input A/D
conversion
Analog input CH
Measured
value
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