Siemens SIMATIC S7-300 Reference Manual page 357
Programmable logic controllers module data
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Special characteristic of parameter assignment to upper and lower limit values
The programmable limit values (triggers for hardware interrupt) differ for the
AI 8 x TC from the range of values shown in Table 4-73.
The reason for this is that numerical methods in the module software for evaluating
the process variables prevent values up to 32511 from being reported in some
cases. The process input value at which a hardware interrupt for an underflow or
overflow occurs depends on the calibration factors for an individual channel and
can vary between the lower limits shown in the Table below and 32511 (7EFF
Limit values should not be set at values higher than the minimum potential limit
values shown in the tables below.
Table 4-77 Minimum Possible Upper and Lower Limit Values of SM 331; AI 8 x TC in °C
Thermo-
couple
in °C
Type B
1820.1
Type C
---
Type E
---
Type J
1200.1
Type K
1372.1
Type L
900.1
Type N
---
Type R, S
1769.1
Type T
400.1
Type U
600.1
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Minimum Possible
Upper Limit Value
Dec.
Hex.
18201
471A
---
---
12001
2EE1
13721
3599
9001
2329
---
1769.1
451B
4001
0FA1
6001
1771
Minimum Possible
Lower Limit Value
in °C
0
H
---
---
---
---
<-210.0
H
<-270.0
H
<-200.0
H
---
---
-50.1
H
<-270.0
H
<-200.0
H
Analog Modules
).
H
Dec.
Hex.
0
0
---
---
---
---
<-2100
<-2700
<-2000
< F830H
---
---
-501
FE0B
H
<-2700
<-2000
< F830H
4-151
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