User manual

Reference PTQ-104S Rev2 ♦ Quantum Platform
User Manual IEC 60870-5-104 Server for Quantum
Page 166 of 195 ProSoft Technology, Inc.
February 22, 2013
The following illustration shows how these parameters are implemented:
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 all 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.