42
Startup and Basic Operation
Resistance Measurement
Resistance measurement terminals are located in the ET module.
Required settings Options/description
Quantity Resistance
Funct/Port ET: R(meas)
The following picture displays the active
terminals:
The two leftmost terminals are used in 2-
wire systems. MC5-IS automatically checks
the connection and displays the found wir-
ing system (2-wire, 3-wire or 4-wire) in the
measuring window. For more information
concerning wiring options, see Resistance
and RTD Measurement, Connections on
page 95.
Note.
If the measured resistance value is infinite or very high (> 4000 ohm),
the text “+OVER” is displayed in the measuring window. This means
that the circuit is broken or the connection is wrong. Wrong connec-
tion may also cause erroneous reading, typically too low. If neces-
sary, use the 2-wire ohm measurement to check the wiring before
final connection.
Next…
RTD and Resistance Simulation on page 64
RTD Measurement (Temperature) on page 48
Special Measurements on page 51.
Alarm Limit Settings on page 71.
Calibration, see Part D.
T / C , L o w V
H A R T
®
1
m e a s / s i n k
V , ,
V ,
1
,
s i n k
C o m
R , R T D
L o w V
M E A S U R EO U T P U T
E T E
T / C I N T . R J
S E N S O R M E A S U R E & S I M U L A T E
U o : 1 6 V
I o : 2 4 m A
P o : 1 4 5 m W
T / C
W I R E S
O N L Y
4 w m e a s
3 w m e a s
m e a s / s i m
R , R T D
3 w
4 w
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