System information

General Reference Guide eWON Configuration
RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 68
3.4.1.2 Tags validation
For optimisation purpose and since firmware version 5.2, the eWON can detect if tags are valid or not, and disables the polling of invalid tags.
By default, this feature is not activated, See "Global Config" on page 86 to enable it.
At the creation of the Tags or at the initialisation of an IOServer, all tags are considered as valid and are polled.
If repetitive errors occur on some Tags, these tags will be considered as invalid and will not be polled anymore !
A specific error message will be written in the event log.
This message is "Protocol Error while reading Tag (TagName - Polling disabled for this tag)" (see example in figure below)
Figure 60: Tag validation - error event
Invalid tags will be polled again when:
• the IOServer is started (i.e.: after a IOServer modification)
• a manual INIT of the IOServer (See "IO Server Init" on page 86)
• a modification of the Tag (in the I/O Server Setup part of Tag Setup)
3.4.1.3 Tags monitoring and handling
The eWON engine can handle the following operations on the Tags:
3.4.2 Tag definition: Setup
The Tag Setup page, reachable by clicking on the Tag Setup item of the Configuration menu, offer the possibility to build the eWON Tag’s
dictionary.
The Tag name dictionary is the eWON central database where you have to define all the Input / Output (internal – available on the eWON – or
external – through extension bus) that you want the eWON to monitor. If your Input/Output is not defined by a Tag, you will not be able to address
it.
The Tag configuration includes two parts:
• The complete Tag configuration except for the actions to execute in case of an alarm.
• The alarm action list.
The first part of the configuration is accessed through the Tag hyperlink; the second part is accessed with the icon next to the Tag hyperlink.
Note: In the header menu of the Tag edition, a combo box appears with a list of pages (please refer to chapter “Pages configuration”
on page 79). Only the Tags of the selected page will be displayed in the list, except if "ALL" is selected.
Operation Description
Alarm monitoring
Check for low and high alarm levels or Boolean alarm level and management of alarm
acknowledgement, alarm historical logging and action on alarm (Email, SMS, etc.)
Historical logging
Tags can be monitored and changes on a Tag can be saved in the Flash File System.
Storage can be based on change threshold or at regular interval.
Real Time logging
A Tag history can be kept in memory for an amount of time with a given time interval. This
operation is volatile and does not involve any flash storage.
Modbus TCP publishing
All the Tags can be given a Modbus address and can be read using the Modbus TCP protocol
by and external modbus TCP master.
Tag grouping Tags can be organized by page for easier handling and viewing.
Script Access All the Tags values and attributes can be read or changed from script.
Table 42: Tags operations handled by the eWON