IEC-60870-5-104 (104S) Protocol Implementation
104S
♦
ProLinx Gateway
Protocol Manual
(Firmware v3.00 and later)
Page 98 of 157
ProSoft Technology, Inc.
January 22, 2010
3.6.4 Invalid
Bit
Monitoring
This feature allows the application to set the invalid (IV) quality bit of the protocol for
all the monitored ASDU types supported. If the feature is enabled, the status of each
point configured by the user can have the individual IV quality bit determined by the
other gateway protocol.
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
C
YCLIC
S
ET
IV
T
IME
parameter determines the interval at which the driver will set
all the IV bits for the points being monitored in the gateway. If the IV bit is ON for the
number of times specified by the
IV
F
AIL
C
OUNT
parameter , the point is in an invalid
state. The driver will check the state of each bit at the frequency determined by the
IV
C
HECK
D
ELAY
T
IME
.
The values for the parameters must permit the driver to properly execute the logic.
For example, the value for
C
YCLIC
S
ET
IV
T
IME
should be twice the
IV
C
HECK
D
ELAY
T
IME
,
multiplied by the
IV
F
AIL
C
OUNT
. If the cyclic timer is set to a smaller value, the
logic may not execute correctly.
Summary of Contents for ProLinx 104S
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