Siemens Simatic S7-400 - Manual (Page 554)

Interface Submodules
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S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Interrupts
The IF 961-CT1 can initiate an interrupt when comparison values are reached or in
the event of overflow, underflow, or zero pass of the counter.
Diagnostic Interrupt
The IF 961-CT1 can initiate a diagnostic interrupt for the following events:
• Missing or incorrect counter module parameters
• Hardware interrupt lost
• Signal A, B, or N faulty
Which Signals Can the IF 961-CT1 Count?
The IF 961-CT1 interface submodule can count signals generated by incremental
encoders with 5 V differential signals or with 24 V signals.
The IF 961-CT1 interface submodule can also count 24 V signals generated, for
example, by a light barrier.
Additional Information
You will find more information about the interface submodule IF 961-CT1 in /108/,
IF 961-CT1 Counter Function Module, Programming and Parameter Assignment
Manual.