Deadband

Use

In the notification process, you can specify a value for the deadband (see also: Deadband). This serves as a limit value to filter out measurement values.

Integration

  • You can specify the deadband for OPC DA source systems on the Settings tab (in the Group Settings area) of the source system. For OPC DA source systems, you can only specify the deadband as a percentage. The deadband percentage indicates the bandwidth in which the value of a tag must at least change for the source system to transfer the tag to PCo. See also: OPC DA Source System: Settings Tab.

  • For all other agents, you specify the deadband for the agent instance on the Subscription Items tab. On this tab, you select the tag or tags. You can also specify a deadband here. The deadband can only be specified as an absolute value here. See also: Agent Instance: Subscription Items Tab.)

Example

You are monitoring the tags of an OPC DA source system. On the OPC server, you have defined a minimum and a maximum value for the tag that is to be monitored.

In PCo, on the Settings tab of the OPC DA source system, you have defined a deadband of 10%.

The percentage that you enter in the Deadband field is applied to the difference between the minimum and maximum value. You have specified for the tag that is to be monitored that you want the tag value to always lie between 0 and 100. With a deadband of 10%, a tag value must change down or up by 10 compared to the last reported value so that a notification is sent from the OPC server. If a tag value is 50 and changes to 52, no information is sent to PCo. If the tag value changes later to 58, still no information is sent. Only when the tag value reaches 60 is information issued to PCo from the OPC server. The OPC source system then sends the tag value to PCo. In this case, PCo creates a notification message and sends it to the destination system, for example, to an SAP MII system. The SAP MII system can then send a mail to a previously defined recipient or create a maintenance notification in the ERP system for this.