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PowerLogic T300 - When used as a slave IEC 104 device of ABB RTU, why is analog data reading slow?
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Hello,
The transmission of analogue values using IEC 104 Protocol is linked to different processes:
- the client (here ABB RTU) is sending a "General Interrogation" request to the server (T300). The server will answer with the content of all its IEc104 database (including analogue values). (this can also be done with a specific "read" request to read only some variables). (the period for this request is a setting of the client)
- cyclic analogue events: some elements of the database can also be sent cyclically by the T300 (T300 IEC104 settings. here for example, all "MMEC" variables will be sent cyclicly every 120s)
- spontaneous events: if a "Threshold" is associated to a analogue variable, a spontaneous event (that can be timestamped) is generated when the gap with the last sent value is higher than the thresold, and sent to the client. The threshold is expressed in absolute value (not in percentage).
Here a threshold of 10(A) is associated to the Phase current, so each time the variation of the current (versus the last sent value) will be higher than 10 A, an event will be transmitted.
Typically, we are using 10(A) for currents, 1000 (or 1500)(V) for (MV) voltages, 10000 for powers, 5(°) for temperature. But it can be adapted to have more or less events.
We don't have the configuration for this project, we can suppose that thresholds are not set on the T300, and cyclic scan neither. So the refresh of analogue values on the client is only due to GI rate. (3 min ?)
Advice: set some thresholds to the analogues values that are shared with the ABB RTU.
(this is done in Easergy Builder / coreDb : Analog tab / Destinationx Threshold)
Regards,
Mathieu.
Link copied. Please paste this link to share this article on your social media post.
Hello,
The transmission of analogue values using IEC 104 Protocol is linked to different processes:
- the client (here ABB RTU) is sending a "General Interrogation" request to the server (T300). The server will answer with the content of all its IEc104 database (including analogue values). (this can also be done with a specific "read" request to read only some variables). (the period for this request is a setting of the client)
- cyclic analogue events: some elements of the database can also be sent cyclically by the T300 (T300 IEC104 settings. here for example, all "MMEC" variables will be sent cyclicly every 120s)
- spontaneous events: if a "Threshold" is associated to a analogue variable, a spontaneous event (that can be timestamped) is generated when the gap with the last sent value is higher than the thresold, and sent to the client. The threshold is expressed in absolute value (not in percentage).
Here a threshold of 10(A) is associated to the Phase current, so each time the variation of the current (versus the last sent value) will be higher than 10 A, an event will be transmitted.
Typically, we are using 10(A) for currents, 1000 (or 1500)(V) for (MV) voltages, 10000 for powers, 5(°) for temperature. But it can be adapted to have more or less events.
We don't have the configuration for this project, we can suppose that thresholds are not set on the T300, and cyclic scan neither. So the refresh of analogue values on the client is only due to GI rate. (3 min ?)
Advice: set some thresholds to the analogues values that are shared with the ABB RTU.
(this is done in Easergy Builder / coreDb : Analog tab / Destinationx Threshold)
Regards,
Mathieu.
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