Analog Modules
5-32 S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Behavior on Failure of the Supply Voltage

Failure of the load power supply L+ of the diagnostics-capable analog module is
indicated in the case of parameterized two-wire transmitters by the EXTF LED on
the module. Furthermore, this information is made available on the module (entry in
diagnostic buffer).
Triggering of a diagnostic interrupt depends on the parameter assignment (see
Section 5.7).
5.5.2 Effect of Range of Values of the Analog Values

Effect of Errors on Analog Modules with Diagnostics Capability

Any errors that occur can lead to a diagnostics entry and a diagnostic interrupt with
analog modules with diagnostics capability and corresponding parameter
assignment. You will find the errors that might be involved in Section 5.16.

Effect of Range of Values on the Analog Input Module

The behavior of the analog modules depends on where the input values lie within
the range of values.
Table 5-39 Behavior of the Analog Input Modules as a Function of the Position of the
Analog Value Within the Range of Values
Measured
Value In Input Value LED
(EXTF) Diagnostics Interrupt
Rated range Measured
value – –
Overrange/
underrange Measured
value – –
Overflow 7FFFH Flashes1Entered1Diagnostic
interrupt1
Underflow 8000H Flashes1Entered1Diagnostic
interrupt1
Beyond the
programmed
limit
Measured
value Hardware interrupt1
1) Only for modules with diagnostics capability and depending on parameter assignment