Signal Modules of the S7-400
3-5
Automation System S7-400 Configuration and Use
A5E0044271 1-02
3.4 Overview of the Performance Characteristics of the
Signal Modules
Introduction
Varying signal types (analog and digital) and signal levels (voltage levels) of the
actuators and sensors required different signal modules to process the signals in
the CPU.
The S7-400 offers a wide range of signal modules to handle any type of controller
signals.
Process Interrupt
The signals of the modules are read by the CPU in cycles and processed in the
user program.
Some applications, however , require fast response to certain signal transitions in
the I/O. This task demands signal modules that are capable of triggering process
interrupts. The process interrupt stops the processing and user program and calls
up a configured interrupt OB.
Diagnostics
When an fault occurs, a wire-break at the module, for example, the cyclic program
is stopped, a diagnostic interrupt triggered and a specific error program started. A
diagnostic message is also entered in the diagnostics buffer of the CPU.
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