Rockwell-automation FactoryTalk View Machine Edition Users Guide Instrukcja Użytkownika Pobierz pdf (Strona 331)

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19 • Use graphic displays

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2. In the Local Messages editor, create these messages with trigger values matching the

values that will be sent to the Hoist_Status tag:

Save the message file with the name “Hoist status.”

3. In the Graphics editor, create a local message display object. In the object’s Properties

dialog box, assign the Hoist_Status tag to the Value connection, and select the Hoist

status message file.

At run time, when the operator views the graphic display containing the local message

display object, the status of the hoist is shown.

Local messages and trigger values

Create messages associated with each tag value that you want to inform the operator

about. Assign each message a trigger value, and set up the data source to send the trigger

value to the Value connection. You can use both HMI and data server tags

The trigger value can be any non-zero integer value (positive or negative). Trigger values

do not need to be contiguous, but they must be unique for each message. For example, you

could use trigger values of 1, 2, and 3, or values of 10, 20, and 30.

If you use an analog tag or an expression, you can use any non-zero integer or floating

point value to trigger an alarm. Floating point values are rounded to the nearest integer.

For information about how values are rounded, see page 7-2.

Trigger values cannot be 0. Digital tags have two possible values, 0 and 1. Therefore, if

you use a digital tag you can only use the value 1 to trigger a message. If you want to use

a digital tag to trigger two different messages, create an expression that adds 1 to the

digital tag’s value. That way, you can use the trigger values 1 and 2.

When the Value connection’s value is 0, the local message display object is cleared.

Trigger value Message

1 The hoist is ready to rise

2 The hoist is raising the pallet.

3 The hoist has stopped.

4 The hoist is lowering the pallet.

5 The hoist is finished rising.

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