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Operating Modes, Settings, Parameters and Commands
9.11 Initiating a Process Interrupt
Introduction
What is a Process
Interrupt
Which Events Can
Initiate a Process
Interrupt?
9
Enabling the
Process Interrupt
Process Interrupt
OB, OB 4x
9-24
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For the individual counters of the FM 450-1, you can set which events are to
initiate a process interrupt. For this purpose, parameterize the counter inter-
rupts in the parameter assignment screen forms.
If you want to program a response to a specific event independently of the
CPU cycle, each counter of the FM 450-1 can initiate a process interrupt. The
CPU interrupts the cyclic program on receiving the interrupts and executes
the process interrupt OB.
The following events in counter operation of the FM 450-1 can initiate a pro-
cess interrupt (for each of the two counters independently of the other):
Opening of the gate (in the operating modes with hardware or software
gate)
Closing of the gate (in the operating modes with hardware or software
gate)
Overflow
Underflow
Reaching comparison value 1 in the up direction
Reaching comparison value 1 in the down direction
Reaching comparison value 2 in the up direction
Reaching comparison value 2 in the down direction
Zero pass
Setting the counter with an external signal
You can select any number of events for process interrupt initiation, provided
the marginal conditions are observed.
You enable the interrupts for the module in the parameter assignment screen
forms when configuring the hardware and you decide whether the module is
to initiate a diagnostics interrupt and/or a process interrupt.
If a process interrupt occurs, the user program is interrupted, the data is trans-
ferred from the module to the start information of OB4x and OB4x is called.
The process interrupt is acknowledged by exiting OB4x.
If there is no OB4x programmed, the CPU goes to STOP. If you then switch
back to RUN, the process interrupt requirements are deleted.
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FM 450-1 Counter Function Module
C79000-G7076-C450-01
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