Communication Driver Alarms
The standard alarm on a communication driver simply watches for a value other than 0. (Zero meaning that there are no errors.) To avoid transient alarms on startup, it is a good idea to use a delay.
You could also use the information in the topic, Communication Driver Log-Enabled Variables to create Alarm tags to warn operators of a decrease in communication quality.
The alarm tag will use an expression as its trigger, where the expression refers to one of the log-enabled variables in the communication driver. It is recommended that you create the alarm tag as a child of the driver tag.
Example:
An alarm to warn of driver quality falling below 0.90.
Expression: [*Driver]\Quality
This expression assumes that the Alarm tag was created as the child of a driver. If the alarm cannot refer to a parent driver, substitute the full name of the driver tag for "*Driver".
Shown configured in an alarm tag: (The delay is not shown, but is recommended.)
- Describes the variables that may be logged for your driver.
