1771-CFM A-B Memory Board, Dynamic
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Subprogram Calls Use a subroutine to store recurring sections of program logic that can be accessed from multiple program files. A subroutine saves memory because you program repetitive logic only once. The JSR instruction directs the processor to go to a separate subroutine file within the logic processor, scan that subroutine file once, and return to the point of departure. For detailed information about how you generate and use subroutines, see your programming software documentation set.
Sequential Function Charts Use SFCs as a sequence-control language to control and display the state of a control process. Instead of one long ladder program for your application, divide the logic into steps and transitions. A step corresponds to a control task; a transition corresponds to a condition that must occur before the programmable controller can perform the next control task. The display of these steps and transitions lets you see what state the machine process is in at a given time. For detailed information about how you generate and use SFCs, see you programming software.
In a PLC-5 backup system configuration, one system controls the operation of remote I/O and DH+ communications. This system is referred to as the “primary system.” The other system is ready to take control of the remote I/O and DH+ communications in the event of a fault in the primary system. This is referred to as the “secondary system.” See chapter 2, “Choosing Hardware,” to select backup system hardware. See the PLC-5 Backup Communication Module User Manual, publication 1785-6.5.4, for more information on configuring a PLC-5 backup system.
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