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I/O Wiring – FM CIO Transmitters
7.5
Discrete output wiring
Discrete output (DO) wiring depends on whether you are wiring terminals 3 and 4 (Channel B) or
terminals 5 and 6 (Channel C), and also on whether you have configured the terminals for internal or
external power. The following diagrams are examples of proper wiring for these configurations:
•
Channel B, internal power – Figure 7-9
•
Channel B, external power – Figure 7-10
•
Channel C, internal power – Figure 7-11
•
Channel C, external power – Figure 7-12
Figure 7-9
Discrete output 1 – Terminals 3 & 4 (Channel B) – Internal power
Total load
Note: See Figure 7-13 for output
voltage versus load information.
Figure 7-10
Discrete output 1 – Terminals 3 & 4 (Channel B) – External power
3–30 VDC
Note: See Figure 7-15 for recommended
resistor versus supply voltage.
Excessive current will damage the transmitter.
Do not exceed 30 VDC input. Terminal current must be less than 500 mA.
LF-Series Flowmeters: Sensor/Transmitter Installation
+
–
+
Pull-up resistor or DC relay
–
CAUTION
+
–
37
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