5.6.3
Effect of the value range for analog values
Effect of errors on analog modules with diagnostics capability
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. You will find the
errors that might be involved in the section "Diagnostics of the analog modules".
Effect of value range on the analog input module
The reaction of analog modules is determined by the actual input values within the value range.
Table 5-39
Reaction of analog input modules as a function of the actual analog value within the value range
Measured value within
Input value
LED (EXTF)
Diagnostics
Interrupt
Nominal range
Measured value
-
-
-
Overshoot/undershoot range
Measured value
-
-
-
Overflow
7FFFH
lit
1
Entry is made
1
Diagnostic interrupt
1
Underflow
8000H
lit
1
Entry is made
1
Diagnostic interrupt
1
Outside of the programmed limit
Measured value
-
-
Hardware interrupt
1
1
Only for modules with diagnostics function and depending on parameter settings
Effect of value range on the analog output module
The reaction of analog modules is determined by the actual output values within the value
range.
Table 5-40
Behavior of the analog output modules as a function of the position of the analog value within the value range
Output value within
Output value
LED (EXTF)
Diagnostics
Interrupt
Nominal range
CPU value
-
-
-
Overshoot/undershoot range
CPU value
-
-
-
Overflow
0 signal
-
-
-
Underflow
0 signal
-
-
-
Analog modules
5.6 Behavior of the analog modules
S7-400 Automation System Module Data
194
Reference Manual, Ausgabe 11/2016, A5E00850736-08