Configure the Gateway
104S
♦
ProLinx Gateway
Protocol Manual
(Firmware v3.00 and later)
Page 22 of 157
ProSoft Technology, Inc.
January 22, 2010
Each of the ASDUs affected by this feature must be assigned a unique priority index
from 0 to 7. Events of the ASDU with a priority of 0 will always be reported before
any others when they are present.
For more information, refer to Event Priority.
Cyclic Set IV Time
1
to
65535
seconds, or
0
to disable Invalid Bit Monitoring
The parameter should be set to a value significantly greater than the value of the
IV
Check Delay Time
parameter, multiplied by the value of the
IV Fail Count
parameter.
Example:
If,
IV Check Delay
=
3
And,
IV Fail Count
=
5
;
Then set
Cyclic Set IV Time
significantly greater than 15; preferably some
multiple of this value, like
30
,
45
,
60,
or more.
The
Cyclic Set IV Time
parameter is one of three parameters needed to establish a
fail-safe data validation system for this protocol implementaion. This parameter is
used with the
IV Check Delay Time
and the
IV Fail Count
parameters to create a
way to alert the remote IEC-104 Client to situations where data being sent by the
gateway might be invalid.
Use the
Cyclic Set IV Time
parameter to set how frequently the Invalid (IV) Bits
assigned to IEC database monitor points (M_xx_xx points) will be set ON. This
means that all the IEC database monitor points configured with IV Bit addresses
greater than zero (0) will have their IV Bit addresses in the gateway database set to
a value of one (1) in a timed, periodic cycle, based on the number of seconds
entered in
Cyclic Set IV Time
.
The IV Bits are checked at the interval specified by the
IV Check Delay Time
parameter. At the end of each check delay interval, if an IV Bit for any IEC database
point is ON, an IV Bit Check Fail accumulator for that point will be incremented. If
the value in any IV Bit Check Fail accumulator becomes equal to the value of the
IV
Fail Count
parameter, the gateway will consider the data value of that point invalid
and will report the invalid status of that point to the Client along with the data value.
If the IV Bit is cleared (reset, set OFF, set to zero) before the IV Bit Check Fail
accumulator value becomes equal to the value of the
IV Fail Count
parameter, the IV
Bit Check Fail accumulator will be reset to 0. The gateway will consider the data
value of that point valid and will report the data value to the Client as valid.
To properly use data validity checking with a ProLinx Gateway, the application that
communicates to the gateway through the other gateway protocol (Modbus,
EtherNet/IP, etc.) must be programmed to provide data validity information, as well
as the actual data to be transferred. This other application must write bit values of
zero (0) or one (1) to the proper gateway database addresses along with the data for
each IEC database point.
Summary of Contents for ProLinx 104S
Page 4: ......
