Glossary

Breakpoint

Breakpoints stop your program when conditions you define become true. For example, you can set a breakpoint to stop execution when a particular rung executes. Breakpoints are very useful for debugging and troubleshooting.

Breakpoint hit

A hit is when a breakpoint condition goes true. Breakpoint hits cause RSLogix Emulate to stop executing your program, freezing the ladder logic and data table in the state that caused the breakpoint condition to become true.

Channel 0

Channel 0 is a special communications channel on certain programmable logic controllers that allow the controllers to send and receive serial communications data. RSLogix Emulate can emulate Channel 0 communications, allowing you to check out these communications through the software.

DBF files

DBF files are standard database files -- most database and spreadsheet packages can read and write this format.

Debug files

Debug files are files used to simulate the actions of I/O in your system. The software does not recognize I/O, and therefore does not emulate I/O operations. If you need to simulate actions of I/O to increase the accuracy of your emulation, you will need to program these files.

Emulate

Emulation is simulation of operation -- in the case of RSLogix Emulate, the software emulates a programmable logic controller.

Halt mode

Stops program execution. Identical to Program Mode.

Hit (breakpoint)

A hit is when a breakpoint condition goes true. Breakpoint hits cause the software to stop executing your program, freezing the data table in the state that caused the breakpoint condition to become true.

One-rung mode

Scans the program one rung at a time. Allows you to step through execution in one rung increments.

Program mode

Stops program execution. Identical to Halt Mode.

Single-scan mode

Goes through one program scan, then halts execution. Allows you to step through execution one scan at a time.

Watchdog timer

The watchdog timer is a processor function that makes sure your ladder logic programs do not take more than a specified amount of time to execute through a complete scan. If the watchdog timer expires before a program scan is complete, the processor sets a major fault. The software can emulate the function of the watchdog timer -- you can also turn off this feature.