ProSoft Technology MVI56-104S - Manual (Page 142)

MVI56-104S ♦ ControlLogix Platform Reference
IEC 60870-5-104 Server Communication Module User Manual
Page 142 of 188
ProSoft Technology, Inc.
November 18, 2009
If a database bit address (1 to 64000) is present, the application may consider
the point with an invalid flag if the previous logic checks the IV bit as 1 during
consecutive IV Check Delay scans. The IV bits would have to be reset to 0 to set
the point to valid state.
The IV DB bit defined for each point can be unique, or many points may share
the same bit. The last case could be used when the points on an I/O module are
to be considered as one set. In this case only a single bit is required. For a point
that is the result of a computation, the valid quality state could be set for each
point individually.
Event Priority
Event Priority permits ASDUs that generate events to be placed in priority
queues that are set by the user. The configuration file contains the following
parameters to support this feature:
The Set Priority Queues parameter must be enabled for this feature to be used.
Each of the ASDUs affected by this feature must be assigned a unique priority
index from 0 to 6. Events of the ASDU with a priority of 0 will always be reported
before any others when they are present.