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Kepware Knowledge Base: Solution


Is There a Way to Notify a Server on a Link's Output Side That the Input Side is in Error?


Last Update: 2018/11/07

Problem:
When using LinkMaster to bridge data from a driver for KEPServerEX to another server, there needs to be a way to notify the other server when the input data is bad so that processing can be paused.

Solution:
If the input's problem is that the device is no longer responding to data requests, KEPServerEX will set the communication's _Error Tag to indicate that the device is not responding. This _Error Tag is located in the _System folder. When communications to the device are good, the tag will have a value of 0. When communications to the device are bad, the tag will have a value of 1.

Note 1: KEPServerEX version 4.190.341 added a new tag called _NoError that is the opposite of the _Error Tag. When communications to the device are good, the tag will have a value of 1. When communications to the device are bad, the tag will have a value of 0.

Note 2: There are server-level tags located in the _System folder that display the current system time in hours, minutes, and seconds. The _Time_Second Tag should change every second and can be used as an indication of the server's general health.

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LinkMaster