Rockwell Automation AutoMax Enhanced Ladder Editor User Manual

Page 17

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1Ć9

You can specify a timeout for the hardware event. This lets you

specify the maximum amount of time in ticks that can pass before

the hardware event occurs. You can use a timeout as a safeguard in

case something happens to the module you are using to generate

the hardware event. If the event does not occur before the timeout

time, a rack STOP ALL error occurs.
To specify a hardware event
Step 1.

Access Program Properties. Make sure no rung or

instruction is selected, and choose Properties from the

File menu.

Step 2.

Choose the Scan Info tab.

Step 3.

Select Event Driven for the Scan Mode.

Step 4.

Select Hardware as the Event Type.

Step 5.

In the Name field, type the name of the hardware event

that will trigger the program's execution.

Step 6.

In the ISCR Variable Name field, type the name of the

variable associated with the ISCR (Interrupt status and

control) register on the hardware module being used to

generate the interrupt.

Step 7.

Do one of the following:

To:

Do this:

specify a timeout for the

hardware event

a. Select the Timeout

Enabled

b. Enter an integer value

between 1 and 32767

You should set the timeout to

a time longer than what you

expect the actual time will be.

A good general rule is 1.5

times longer than the

expected time between

events.

not use a timeout

Make sure the Timeout

Enabled checkbox is not

selected.

8. Click OK to accept the changes.

1.11.3

Specifying a Software Event To Control Program

Execution

A software event is a flag set by another program. Specify the

software event that triggers a program's execution by using the

Scan Info tab under Program Properties.
To specify a software event
Step 1.