Representation of the analog values of analog modules
5.4 Reactions of the analog modules
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
5-25
5.4.2 Influence of the range of analog values
Influence of errors on analog modules with diagnostics functions
Errors may lead to an entry in the diagnostics buffer and trigger a diagnostic interrupt at
analog modules with diagnostics function and corresponding parameter settings.
Influence of the range of values on the analog input module
The reaction of analog modules is determined by the actual input values within the range of
values.
Table 5-40 Reaction of analog input modules as a function of the actual analog value within the range of values
Measured value
within
Input value SF LED Diagnostics Interrupt
Nominal range Measured value - - -
Overshoot/undershoo
t range
Measured value - - -
Overflow 7FFF
H
lit
1
Entry is made
1
Diagnostics interrupt
1)
Underflow 8000
H
lit
1
Entry is made
1
Diagnostics interrupt
1)
beyond programmed
limit
Measured value - - Hardware interrupt
1)
1)
, only supported by modules with diagnostics function, and depending on parameter settings
Influence of the range of values on the analog output module
The reaction of analog modules is determined by the actual output values within the value
range.
Table 5-41 Reaction of analog output modules as a function of the actual analog value within the range of values
Output value within Output value SF LED Diagnostics Interrupt
Nominal range CPU value - - -
Overshoot/undershoo
t range
CPU value - - -
Overflow 0 signal - - -
Underflow 0 signal - - -
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