Siemens SITRANS LR200 Kurzanleitung Seite 23

Allowable operating area
Curve 1 (General Purpose,
Intrinsically Safe, Non-
incendive)
Loop Voltage versus Loop
Resistance
Curve 2 (Flameproof,
Increased Safety, Explosion-
proof)
Loop Voltage versus Loop
Resistance
Page EN-22 SITRANS LR200 (PROFIBUS PA) – QUICK START MANUAL
Curve 1: Power Supply Requirements Power Supply Requirements
900
800
RL=44.6*VL – 493.4
700
600
(17.8v, 300 ohms)
500
400
300
RL=272.7*VL – 4554.1
200
(16.7v, 0 ohms)
100
0
15 17 19 21
Loop Voltage – VL
Loop Voltage - V
(Source Voltage)
Curve 2: Power Supply Requirements
Power Supply Requirements
400
350
(17.8v, 300 ohms)
300
RL=272.7*VL – 4554.1
250
200
(30.0v,845 ohms)
150
100
(16.7v, 0 ohms)
50
0
15 20
Loop Voltage – VL
Loop Voltage - V
(Source Voltage)
(30.0v,845 ohms)
ALLOWABLE
OPERATING AREA
23 25 27 29
L
RL=44.6*VL – 493.4
ALLOWABLE
OPERATING AREA
25
L
7ML19985XD81
30