User manual

Reference PTQ-104S Rev2 ♦ Quantum Platform
User Manual IEC 60870-5-104 Server for Quantum
Page 164 of 195 ProSoft Technology, Inc.
February 22, 2013
The parameters required to support this feature are:
 Cyclic Set IV Time
 IV Check Delay Time
 IV Fail Count
To disable this feature, set the IV Fail Count parameter to 0. If the IV bit field is
absent or set to 0, the invalid quality state for the point will always be reported as
valid. If used, the Cyclic Set IV Time parameter must be at least 3 times larger
than the IV Check Delay Time.
The CYCLIC SET IV TIME parameter determines the interval at which the driver will
set all the IV bits for the points being monitored. If the IV bit is ON for the number
of times specified by the IV FAIL COUNT parameter, the point is in an invalid state.
The driver will check the state of each bit at the frequency determined by the IV
CHECK DELAY TIME.
The values for the parameters must permit the driver to properly execute the
logic. For example, the value for CYCLIC SET IV TIME should be twice the IV
CHECK DELAY TIME, multiplied by the IV FAIL COUNT. If the cyclic timer is set to a
smaller value, the logic may not execute correctly.