Principle Of Operation - Datcon DT4240 Series Operating Instructions Manual

DT4240 xx xx xx xx
Area of application
20230503-V0

3.3. Principle of operation

The DT4240 xx xx xx xx AC Voltage Meter enable
0-125 VAC / 0-250 VAC / 0-450 VAC voltage ranges to be
displayed on the control panel. Large 14.2 mm height LED
display make process value easily visible at a distance. The
displayed value is proportional to the True RMS value of the
input voltage.
Easy on-site configuration through the front panel
membrane keypad is a major advantage of the
microcontroller-based technology. The configuration
parameters: input range, signal filtering, output scaling,
display refresh rate, limit modes, limit values, etc. are stored
in EEPROM. The settings are protected by a two-level
password against unauthorized manipulation.
Options:
•
Two normally open relay contacts (SPST) for limit
switching or for simple control tasks.
•
4-20 mA / 0-20 mA galvanic isolated scalable analogue
output. The output can be active (A) or passive (P).
•
RS232 galvanic isolated communication output with
MODBUS RTU slave protocol. Only one instrument can be
connected to the PLC or to the computer.
•
RS485 galvanic isolated communication output with
MODBUS RTU slave protocol. 32 instrument can be
connected to the PLC or to the computer.
Note: either analogue or communication option can be
implemented at the same time.
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