Siemens S5-135U/155U - Page 452

9-70
System Manual
C79000-G8576-C199-06
The resolution with Pt 100 resistance thermometers is approximately 0.25
o
C.
1 ohm  10 units
Units Resistance in
ohms
1)
Temper-
ature in
Byte 0 Byte 1
ohms
1)
ature in
o
C
7
S
6
2
11
5
2
10
4
2
9
3
2
8
2
2
7
1
2
6
0
2
5
7
2
4
6
2
3
5
2
2
4
2
1
3
2
0
2
A
1
E
0
OV
4096 400.0 – 0 1 1 1 1 1 1 1 1 1 1 1 1 0/1 0/1 1 Overflow
4095
2049
399.90
200.98
–
269.1
0
0
1
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0/1
0/1
0/1
0/1
0
0
Overrange
2048
2047
200.0
199.90
266.5
266.0
0
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0/1
0/1
0/1
0/1
0
0
1024
1023
100.00
99.90
0
–0.2
0
0
0
0
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0/1
0/1
0/1
0/1
0
0
Rated range
1
0
0.098
0.0
–
–
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0/1
0/1
0/1
0/1
0
0
1) Resistance value PT 100
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
o
C. If it can be ensured that the
temperature does not exceed 850
o
C, the input value may extend into 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).
Measured-Value
Representation for
Pt 100 Resistance
Thermometers
Analo
g
Input/Output Modules