Analog Modules
4-151
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
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
H
).
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
Minimum Possible
Upper Limit Value
Minimum Possible
Lower Limit Value
in °C Dec. Hex. in °C Dec. Hex.
Type B 1820.1 18201 471A
H
0 0 0
Type C --- --- --- --- --- ---
Type E --- --- --- --- --- ---
Type J 1200.1 12001 2EE1
H
<-210.0 <-2100
Type K 1372.1 13721 3599
H
<-270.0 <-2700
Type L 900.1 9001 2329
H
<-200.0 <-2000 < F830H
Type N --- --- --- --- --- ---
Type R, S 1769.1 1769.1 451B
H
-50.1 -501 FE0B
H
Type T 400.1 4001 0FA1
H
<-270.0 <-2700
Type U 600.1 6001 1771
H
<-200.0 <-2000 < F830H
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