Emerson Micro Motion LF Series, Installation Manual

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LF-Series Flowmeters: Sensor/Transmitter Installation 37
I/O Wiring – FM CIO Transmitters
I/
O
Wi
ri
ng
– FM
A
N
I/
O
W
ir
in
g
– FM FB an
d P
A
I/O
W
ir
in
g
–
F
M
C
IO
Sens
or
W
ir
in
g
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
Figure 7-10 Discrete output 1 – Terminals 3 & 4 (Channel B) – External power
Total load
Note: See Figure 7-13 for output
voltage versus load information.
+
–
3–30 VDC
Note: See Figure 7-15 for recommended
resistor versus supply voltage.
CAUTION
Excessive current will damage the transmitter.
Do not exceed 30 VDC input. Terminal current must be less than 500 mA.
+
–
+
–
Pull-up resistor or DC relay