QUESTION:
Why are identical operator messages generated with a new time stamp?

ANSWER:
You create messages in message class "Operator messages" with the MESSAGE and ALARM_8P blocks. If there is a "HIGH" signal permanently at the message input of the block, the associated message is generated again with a new time stamp as soon as another message input receives a "HIGH" signal. This is a system property of the message class "Operator messages".

The message class "Operator messages" is defined as follows in WinCC:

• Messages without "gone" state
• Messages without acknowledgment

WinCC behavior:
Each "HIGH" state of the block is entered in the operator activities log, as soon as a message is sent from the MESSAGE or ALARM_8P block through a 1/0 or 0/1 transition at any block input.

• A change in WinCC is not possible because of the missing "going" message.
  Example:
  Operation via an I/O field.
• A change in the AS block is not possible because neither the message class nor the WinCC acknowledgment behavior is known to the block algorithm.

Remedy:
Provide the input concerned with pulses when using the MESSAGE or ALARM_8P block for operator messages. A permanent "HIGH" signal is not permissible in this case.