Evaluation Order - Universal Devices ISY-994i User Manual

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And Control 'Switch 1' is switched On

And Control 'Switch 2' is switched On

Set 'Light 3' On

- No Actions - (To add one, press 'Action')

Note that no operator (And or Or) is displayed for the first condition in the If clause. This is

because a single-condition clause has no conjunction, while in a multi-condition clause, the

operation performed on the first condition is wholly dependent upon and determined by

the operator of the second condition. The operator of the first condition, though ignored, is

still maintained in the drop-down setting box in the lower portion of the window, in case

the condition line should be moved down and no longer be the first condition.

9.5.3 Evaluation Order

Within the If clause of a program, expressions are evaluated from left-to-right, meaning the

individual expressions are evaluated from top to bottom as viewed on the screen.

Evaluation does not stop as soon as the outcome is known; rather all expressions within

the clause are evaluated each time the If is invoked.

Status 'Light 1' is On

Status 'Light 2' is On