Wiring Output; Wiring Power - M-system M3-UNIT Series Operating Manual

NOTE
■ MONITOR TERMINALs
• You can check 4 – 20 mA DC signal from a 2-wire transmitter
with the monitor terminals, converted into 1 – 5 V DC voltage
signal with an internal resistor 250 Ω. It is convenient for loop
testing or at abnormal condition. Use the terminals only for
monitoring, not as output.
■ DC CURRENT INPUT (IsOLATOR UsE)
• You can use the M3LDY as isolator with 4 – 20 mA DC input,
without using supply output (terminals 1 and 2) to a 2-wire
transmitter. In this case, do not connect to the terminals 1 and
2, and connect an input device to the terminals 3 and 4 as
shown in the right figure.
• Turn the SW2-7 ON and SW3 OFF.

8.4.2 WIRING OUTPUT

Voltage or current output is provided depending on the output setting.
Output
Ground
(resistance
100 ohms or less)

8.4.3 WIRING POWER

Connect power according to the power input code. The power specifications are shown in the following table.
CODE RATING
R 24 V DC
DC power
Confirm the polarity.
Output
ALLOWABLE RANGE & POWER CONSUMPTION
24 V ±10%, approx. 3 W
DC power
Input device
4 – 20 mA
M3LDY OPERATING MANUAL EM-2664-B Rev.0
250 Ω
24 V
24.9 Ω
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