Siemens SIMATIC PCS 7 OSx, Operator'S Manual

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Action Requests
7-12
SIMATIC PCS 7 OSx 4.1.2 Operator
Responding to Action Requests (continued)
An action request occurs when a defined process event is triggered. If the
system is in the Operate state when an event occurs, it displays the action
request icon in the lower right-hand corner of the OSx station screen and
places information about the request on the Operator Change Log, which
logs all changes made to the system.
The action request icon tells the operator two things.
• An action request is triggered and needs attention.
• The severity of the request is either Urgent (red) or Normal (yellow),
and, therefore, may or may not require immediate attention.
When the operator selects the icon, the system displays a summary screen
that allows the operator to respond to the action request. Depending on the
request that is triggered, the operator can respond in the following ways:
• Choose an option from up to four user-defined choices.
•
Enter an attribute value for a specific device (for example, a setpoint
value of 500 psi for a pressure tank).
• Acknowledge that an event has taken place or that a process is ready to
start.
• View information about the process.
As the operator responds to an action request, the Operator Change Log
records the action request, the response, and any error that has occurred.
Before the system accepts a response to a request, the operator must have
sufficient security privileges to modify the following tags:
•
Answer tags for the Multi-Choice and Enter Value requests.
• Reset tags for all types of requests.
The operator also has the option to enter comments in the Comment field
when answering each request. This practice allows the operator to
document all action request transactions.
The following paragraphs describe the five action request types and the
procedures for answering each.
Responding to
Different Action
Request Types