Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 405)

21 • Set up graphic objects
21-13
•
•
•
• •
Hold the value for a specific period of time
To set up an object’s Enter key handshaking so that the value at the Value connection is
held for a specific period of time, assign a tag to the Enter connection and specify the
Enter key hold time. You can also specify an Enter key control delay, if desired.
How handshaking works
This method of Enter key handshaking works as follows:
1. When the operator presses the Enter button, the value is sent to the Value connection
and the “Enter key control delay” timer begins timing. (The use of a delay is optional.)
2. If you specify an Enter key control delay, when the time is up, the Enter connection is
set to 1. If you don’t use the delay, the Enter connection is set to 1 as soon as the
operator presses Enter.
As long as the Enter connection is set to 1, the operator cannot send new values to the
data source.
3. When the Enter connection is set to 1, the “Enter key hold time” timer begins timing.
4. When the Enter key hold time has expired, the Enter connection is reset to 0 and the
operator can send a new value to the Value connection.
To set up Enter key handshaking to hold the value for a specific
period of time
1. In Timing tab of the object’s Properties dialog box, specify the Enter key control delay
(optional) and Enter key hold time properties.
2. In the Connections tab, assign a tag to the Enter connection. A digital tag is
recommended (either an HMI tag or a data server tag).
You can also use the Property Panel to specify the properties and assign a tag to the Enter
connection.
Hold the value until it is acknowledged
To set up an object’s Enter key handshaking so that the value at the Value connection is
held until the data source notifies FactoryTalk View that it has read the value, use two
connections: the Enter connection and the Enter handshake connection.
Instead of using an Enter key hold time, specify an Enter key handshake time. You must
also specify the Handshake reset type. You can use an Enter key control delay, if desired.