Emerson 2400S 3.5.4Hazardous area discrete input wiring, Before You Begin Power Supply

I/O Wiring – Model 2400S Analog Transmitters

Figure 3-19Safe area frequency/discrete output load resistance values

Absolute minimum = 10 Ohms for supply voltage less than 5 Volts

(Ohms)	200
	190
	180
value
	170
	160
minimum	150
	140
	130
	120
barrier
	110			OPERATING REGION
R	100
+
	90
load
	80
R
	70
resistor
	60
	50
	40
pull-up
	30
	20
External	10
	0
	5	7	9	11	13	15	17	19	21	23	25	27	29	31	33	35

Supply voltage VDC (Volts)

3.5.4Hazardous 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

Hazardous area Safe area

Rbarrier		PLC or
	–	other device
	+
Rbarrier

Direct DC input	OR	VDC
(see Table 3-2)		(see Table 3-2)

Before You Begin

Power Supply

I/O Wiring – AN

I/O Wiring – DP and DN

Installation Manual 25