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Installation Manual 25
I/O Wiring – Model 2400S Analog Transmitters
Power Supply I/O Wiring – DP and DNI/O Wiring – ANBefore You Begin
Figure 3-19 Safe area frequency/discrete output load resistance values
3.5.4 Hazardous area discrete input wiring
The following discrete input wiring diagram is an example of proper hazardous area wiring for the
transmitter’s discrete input.
Figure 3-20
0
10
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5 7 9 11131517192123252729313335
Supply voltage VDC (Volts)
External pull-up resistor R
load
+ R
barrier
minimum value (Ohms)
Absolute minimum = 10 Ohms for supply voltage less than 5 Volts
OPERATING REGION
PLC or
other device
OR
VDC
(see Table 3-2
)
Direct DC input
(see Table 3-2
)
+
–
Hazardous area Safe area
R
barrier
R
barrier