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DMC-1700/1800 Chapter 7 Application Programming • 141
Event Triggers & Trippoints
To function independently from the host computer, the DMC-1700/1800 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-1700/1800 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 controller can make decisions based on its own status or
external events without intervention from a host computer.