Script Type Function Block Command: Wait For

Command Description

This command causes the function block script to wait for a period of time before continuing to the next step.

Value Field Parameters

The Value field indicates how long the script should wait, in seconds. It can be specified in two ways:

• Static Wait Time: After the Wait For command is selected, a default value of 0.001 seconds (1 millisecond) will appear by default in the Value column field. Double-click the field and change the figure to however long you want the script to wait.

• Dynamic Wait Time: Double-click the Value cell, then press the = key twice to launch the Expression Builder. The script will wait for a number of seconds equal to the value returned by the defined expression.

Example

Figure 1 shows an example of a function block script using a dynamic Wait Forcommand (and a Wait Until command as well). The script waits for receipt of an incoming message, then uses the value in a signal it contains to dictate how long to wait before sending an outgoing message. The script then repeats the process the next time the incoming message arrives.

Figure 1: Example using the Wait For and Wait Until commands.