Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 83)

Chapter
7
7-1
Selecting Interrupt Routines
This chapter covers interrupt routines that you can choose to include when
you program your system.
If you want to read about: Go to
page:
Using programming features 7Ć1
Writing a fault routine 7Ć3
Use your design specification to determine if you need one or more of the
following programming features:
program execution control
power-up routines
If a portion of logic
should execute:
Example: Use: By doing the following:
Immediately on
detecting conditions
that require a startup
Restart the system
after the system has
been shut down
Powerup/Fault
Routine
Create a separate file for a controlled startĆup procedure for the first time that you
start a program or when you start a program after system down time. The
processor executes the powerĆup/fault routine to completion.
Immediately on
detecting a major fault
Send critical status
to a supervisory
processor via DH+
after detecting a
major fault
Fault Routine Create a separate file for a controlled response to a major fault. The first fault
detected determines which fault routine is executed. The processor executes the
fault routine to completion. If the routine clears the fault, the processor resumes
the main logic program where it was interrupted. If not, the processor faults and
switches to program mode.
Chapter Objectives
Using Programming
Features
System Design
Determined
Choosing
Communication
Transferring Discrete
and Block Data
Planning Your
System Programs
Calculating Program
Timing
Choosing Hardware
Placing System
Hardware
Assigning Addressing
Mode, Racks,
and Groups
Selecting Interrupt
Routines