Holding the execution of an action till the condition is not met. The condition is met, when a value of the expression is TRUE.
WAIT action without expression:
Holding the execution of actions till the last assignment is executed. This variant of the action WAIT allows to remove time hazards and also check the assignment success. Assignment to a local variable is immediate (synchronously with the execution of actions). On the other hand, assignment to an object (setting an object value) represents only a request and its execution may take a while. There is the possible risk of time hazard.
M.Cmdof I/O tag type, output integer type.
- process D2000 KOM is not running,
- station communication failure,
- writing into a device failed,
- object is not in the manual mode.
In case of assigning a selection, then this is controlled as the whole. Every fractional writing must be well executed. Such a situation occurs, for the assignment of a value of structure type, if references to objects are in individual items.
SD.Reccontains one item of Integer type with the name Int and two items of Object type with the names s
The structure type of the object
Structured variable type is
SD.Rec and its row number is 2.
There are the objects
M.1, M.2, M.3, M.4 - output I/O tags of Integer