Azbil C1M - Connecting the Current Output Device; Noise Suppression Measures

4-11
Chapter 4. Wiring
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Connecting the current output device
When the power of this device is turned off, its current input circuit is
disconnected.
When connecting a current output device to multiple C1M units whose power can
be turned on and off individually, use the separately sold resistor (81401325) and
specify a voltage input range.
1–5 V250 Ω
4–20 mA
1–5 V250 Ω
Model C1M
Model C1M
Current output device
+
−
+
−
+
−
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Noise suppression measures
Use a single-phase instrument power supply to minimize the effect of electrical
noise on this device.
If there is a large amount of electrical noise from the power supply, use an isolation
transformer and a line filter.
(Azbil’s line filter model No.: 81442557-001)
Use a CR filter for quick-rising noise.
(Azbil’s CR filter model No.: 81446365-001)
Handling Precautions
• If anti-noise measures are taken, do not bundle primary and secondary
power lines of the isolation transformer together, and do not put them in
the same conduit or duct.