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The 460 Analog Input Module
Measured-value
representation for resistance
thermometers in the standard
Pt 100 range
Inputs Resistance
Tempera-
o
in Ohms
ture in
C 7
4096
400.0
-
4095
399.90
-
2049
200.098
69.1
2048
200.0
66.5
2047
199.90
66.0
1024
100.00
0
1023
99.90
-0.2
1
0.098
-
0
0.0
-
Extended Pt 100 range
9 - 28
The resolution with Pt 100 resistance thermometers is approximately
o
0.25
C.
1 ohm ≡ 10 units
Byte 0
6
5
4
3
2
1
0
11
10
9
8
7
6
S
2
2
2
2
2
2
2
0
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
A = Active bit
E = Error bit
OV = Overflow bit
S = Sign
When Pt 100 resistance thermometers are connected, the maximum
temperature in the rated range is 266
temperature does not exceed 850
the overrange. The resolution is then 4095 units. Unused inputs can be
utilized for voltage measurements in the 500 mV range (see front
connector assignments).
In addition to the standard Pt 100 range, there is an extended Pt 100
range on the 460 analog input module. You can select this with the
mode switch.
The following is printed on the cover of the module to set the Pt 100
mode:
Standard range:
"resistance thermometer uncompensated full range"
Extended range:
"resistance thermometer compensated low range"
In this range, the basic resistance of the Pt 100 at 0
compensated for on the module. As in the standard range, the Pt 100 is
fed with a constant current of 2.5 mA. Using the overrange (- 100 mV
to + 100 mV), this results in a temperature range of approx. -100 °C to
+ 100 °C.
This measuring range of 200 °C is resolved to 8192 units with the
correct sign for the temperature. One unit thus corresponds to
approximately 0.025 °C. If you select the extended Pt 100 range, you
can use all 8 analog inputs in this range only.
You should only use the 6ES5 498-1AA11 range card (± 50 mV /
500 mV).
Byte 1
7
6
5
4
3
2
1
5
4
3
2
1
0
2
2
2
2
2
A
E
1
1
1
1
1
0/1 0/1 1
1
1
1
1
1
0/1
0/1
0
0
0
0
1
0/1
0/1
0
0
0
0
0
0/1
0/1
1
1
1
1
1
0/1
0/1
0
0
0
0
0
0/1
0/1
1
1
1
1
1
0/1
0/1
0
0
0
0
1
0/1
0/1
0
0
0
0
0
0/1
0/1
o
C. If it can be ensured that the
o
C, the input value may extend into
o
C79000-B8576-C109-03
0
OV
Overflow
0
Overrange
0
0
0
0
Rated range
0
0
0
C (100 ohms) is
System Manual
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