ABB REC 523 Technical Reference Manual page 60

REC 523
Remote Monitoring and Control Unit
1MRS750881-MUM
Technical Reference Manual
Each SNVT_alarm output has its own event buffer. The size of each buffer is 50
events. Buffering contains local overflow, which means that overflow in LonMark
event handling does not affect other event receivers in REC 523. The local overflow
event is given with the location_id 231 (LonMark application's individual
application number) and event code 51.
Sending and flow control of the SNVT_alarms
Two separate tasks within REC 523 handle the sending of events through two
separate SNVT_alarm outputs. Alarms are sent with the minimum transfer rate
defined by the throttle network variable input, NV index 64. The default setting 200
ms may be changed by writing a new value to the throttle input. The maximum
throttle value is one minute.
If the sending of a SNVT_alarm fails, the same event is retransmitted at the rate
defined in the timeout network variable input, NV index 65. The timeout setting is
1 second by default. If transmission fails 100 times in a row, the timeout is
multiplied with 100. The max. written timeout setting value is one minute.
Both the throttle and timeout input variables are of the structured type
SNVT_elapsed_tm.
Refer to SNVT documentation for more information.
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