ProSoft Technology MVI56-101S - Manual (Page 153)

MVI56-101S ♦ ControlLogix Platform Reference
IEC 60870-5-101 Slave Communication Module User Manual
ProSoft Technology, Inc. Page 153 of 193
August 2, 2011
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 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.