
Analog modules
5.6 Behavior of the analog modules
S7-400 Automation System Module Data
210 Reference Manual, Edition 09/2009, A5E00850736-06
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 - - -
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