ProSoft Technology 5201-DFNT-104S - Manual (Page 22)

104S v2 ♦ ProLinx Gateway Configure the Gateway
(Firmware v2.xx) Protocol Manual
Page 22 of 157
ProSoft Technology, Inc.
March 19, 2010
This means the other protocol application or the logic application will be
responsible for clearing the IV Bits for data points which contain valid data at a
time interval less than the amount of time required to accumulate the required
number of IV Bit Check failures. In cases where inRAx or ProTalkQ modules are
used, backplane communication happens so quickly that cyclic setting of the IV
Bits will be quickly undone by data transfers from processor memory. However,
if the process logic or other protocol application does not clear the IV Bits set by
firmware, then all IEC database monitor point values will be reported to the Client
as invalid.
NOTE: If one or more of the Cyclic Set IV Time, the IV Check Delay Time, or the IV Fail Count
parameters are set to zero, the data validity checking feature will be disabled for all points in the
IEC database and data reported to the remote Client will always be reported as valid data. If you
wish to have actual data validity information relayed to the Client, be sure the Cyclic Set IV Time,
the IV Check Delay Time, and the IV Fail Count parameters are set to non-zero values and be sure
the application has been programmed to properly manipulate the IV Bit addresses in the gateway
database. Once data validity checking has been enabled, you can still turn off validity checking on
a point-by-point basis by setting the IV Bit Address to zero (0) for any point you wish to exclude
from data validity checking and reporting.
For more information on the data validity features of this protocol implementation,
refer to Invalid Bit Monitoring (page 84).
IV Check Delay Time
1 to 65535 seconds, or 0 to disable Invalid Bit Monitoring
This parameter sets the number of seconds between IV Bit value checks. Every
IEC database monitor point which has an IV Bit address set greater than 0 will
have that bit address checked at the interval specified by this parameter.
Setting this parameter to zero (0) will disable data validity checking.
IV Fail Count
1 to 65535 seconds, or 0 to disable Invaild Bit Monitoring
This parameter sets the number of successive IV Bit check failures which must
occur before the data from a IEC database monitor point will be reported to the
remote Client as invalid data.
An IV Bit Check Failure occurs when the IV Bit value in the gateway database is
set ON, when it contains a value of one (1), at the time an IV Bit Check is
performed. IV Bit Check failures are counted and held in separate IV Bit Check
Failure accumulators for each IEC monitor point configured for validity checking.
If the value in any point's failure accumulator becomes equal to the value set in
this parameter, the gateway will flag the data from this point as invalid and report
to the Client this invalid status, along with the point's data value.
Setting this parameter to zero (0) will disable data validity checking.