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Analog Input/Output Modules
Measured-Value
The resolution with Pt 100 resistance thermometers is approximately 0.25
Representation for
1 ohm
Resistance
Thermometers in
the Standard Pt
100 Range
Units Resistance in
Temper-
ohms
ohms
ature in
ature in
o
C
4096
400.0
–
4095
399.90
–
2049
200.98
269.1
2048
200.0
266.5
2047
199.90
266.0
1024
100.00
0
1023
99.90
–0.2
1
0.098
–
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
overrange. The resolution is then 4095 units. Unused inputs can be utilized
for voltage measurements in the 500 mV range (see front connector
assignments).
Extended Pt 100
In addition to the standard Pt 100 range, there is an extended Pt 100 range on
Range
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 (
9-26
10 units
Byte 0
7
6
5
4
3
2
1
0
11
10
9
8
7
6
5
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
Byte 1
7
6
5
4
3
2
1
0
4
3
2
1
0
OV
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
0
1
0/1
0/1
0
0
0
0
0
0
0/1
0/1
0
1
1
1
1
1
0/1
0/1
0
0
0
0
0
0
0/1
0/1
0
1
1
1
1
1
0/1
0/1
0
0
0
0
0
1
0/1
0/1
0
0
0
0
0
0
0/1
0/1
0
o
C. If it can be ensured that the
o
C, the input value may extend into the
o
C (100 ohms) is
50 mV/500 mV).
C79000-G8576-C199-06
o
C.
Overflow
Overrange
Rated range
System Manual
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