To monitor the status of the automatic scanning of Tags, as well as the status of communication with every slave, the Online Event PLC Tag was created. This Tag reference automatic scanning Tags using the N1 and N2 parameters, returning 0 (zero, Offline mode) or 1 (one, Online mode) to indicate the status of communication for each Tag. Automatic scanning Tags are considered in Online mode whenever an automatic scanning is successful, and are considered in Offline mode after a certain number of consecutive communication errors. The maximum number of communication errors allowed without a Tag being considered as in Offline mode can be configured in the Tag goes offline after n comm. errors option on the configuration window.