Galil DMC-3425 user manual Program Flow Commands, Event Triggers & Trippoints

Program Flow Commands

The DMC-3425 provides instructions to control program flow. The DMC-3425 program sequencer normally executes program instructions sequentially. The program flow can be altered with the use of event triggers, trippoints, and conditional jump statements.

Event Triggers & Trippoints

To function independently from the host computer, the DMC-3425 can be programmed to make decisions based on the occurrence of an event. Such events include waiting for motion to be complete, waiting for a specified amount of time to elapse, or waiting for an input to change logic levels.

The DMC-3425 provides several event triggers that cause the program sequencer to halt until the specified event occurs. Normally, a program is automatically executed sequentially one line at a time. When an event trigger instruction is decoded, however, the actual program sequence is halted. The program sequence does not continue until the event trigger is "tripped". For example, the motion complete trigger can be used to separate two move sequences in a program. The commands for the second move sequence will not be executed until the motion is complete on the first motion sequence. In this way, the DMC-3425 can make decisions based on its own status or external events without intervention from a host computer.

NOTE: Event triggers should only be used within a program and not sent to the controller as a direct command.

DMC-3425 Chapter 7 Application Programming• 115