Since the version D2000 v7.1.0, release A050525000,
there has been implemented a new ASDU 252 into the communication protocols
IEC 870-5-104
and IEC 870-5-104 Server. The ASDU 252
allows a data transmission between two D2000 Systems, one of them uses the protocol
IEC 870-5-104 and the other one uses IEC
870-5-104 Server.
ASDU 252 should be used if you need to transfer:
- values along with their user attributes (flags),
- values of Text, Relative time and Absolute time type,
- analog values with the 32-bit accuracy,
- values of basic object attributes ValueLimitStatus and/or ValueProcAlarmStatus (very rarely).
Required configuration
- the types of output I/O tag and respective input I/O tag must be the same (Ao-Ai, Dout-Di, TxtO-TxtI, ...)
- configuration of output I/O tag must be set to ASDU 252 (the tab Address, the parameter ASDU type)
Communication station parameters:
| Keyword | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
| D2CLS | D2000 Copy Limit Status | The parameter is set on the station that is the
parent of input I/O tags for which the partner station sends ASDU 252. Such I/O tag then ignores its defined
limits and copies the ValueLimitStatus
(basic object attribute)
of its control object. If there are configured
process alarms for input
I/O tag, they will be evaluated according to the ValueLimitStatus copied from the control object.
Note: The parameter D2VCO must be set on the partner station. |
- | False |
| D2CPA | D2000 Copy Process Alarms | The parameter is set on the
station that is the parent of input I/O tags for
which the partner station sends ASDU 252. Such I/O tag
then ignores its configuration and copies process alarms of the control
object of partner output I/O tag. Note: The parameter D2VCO must be set on the partner station. |
- | False |
| D2VCO | D2000 ASDU Value from Control Object | The parameter is set on the station
that is the parent of output I/O tags with defined ASDU 252. If a control
object is defined for such I/O tag, then the value of the control object is
sent to communication as the output value (along with its
basic object attributes -
ValueType, ValueTime, ValueStatus, ValueLimitStatus,
ValueProcAlarmStatus,
...). Warning: In this case, there are ignored all configuration of output I/O tag concerning process alarms, limits and value conversion ! Value of output I/O tag seems to be correct within D2000 system, but there is sent "raw" value of control object into communication. Note: To send "raw" value of control object, the value types of control object and output I/O tag must be the same, otherwise there is sent ordinary output value. |
- | False |
Notes:
- The parameters D2CLS and D2CPA allow getting values of process alarms and ValueLimitStatus of control object only (not given I/O tag) - because process alarms and ValueLimitStatus of I/O tag are being set after its writing.
- Implemented functionality (combination of the parameters D2CLS, D2CPA and D2VCO) may cause the value of output I/O tag to be "inconsistent" (e.g. value is in IN_LIMIT status and there is the process alarm HL active at the same time). !!! WE RECOMMEND TO USE IT CAREFULLY !!!
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