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6. The SPEL+ Language

6.19 Using Traps

Traps are used to cause program execution to jump to a label or enable a function to be

called or executed as a task when a certain event occurs. Four traps are user defined and

are triggered by an input condition.

Note that Traps must be re-armed before they will fire again. To re-arm a trap, execute a

Trap statement at the end of the trap function.

You should keep trap functions short and avoid continuous loops. You cannot execute

motion commands in trap functions.

For details on Trap statement, see the SPEL+ Language Reference manual.

Here is a simple example for a trap. In this example, when input 1 turns on, the Sw1 Trap

function executes as a task.

Function main

' Arm the trap

Trap 1 Sw(1) = On Xqt Sw1Trap

RunCycle

Loop

Fend

Function Sw1Trap

' Turn on output 1 for 2 seconds

On 1, 2

' Wait for trap condition to clear

Wait Sw(1) = Off

' Re-arm the trap

Trap 1 Sw(1) = On Xqt Sw1Trap

Fend

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