As can be seen from the standard's full designation 'Network access for IEC using standard transport profiles', its application layer is based on IEC The TCP protocol is used for connection-oriented secure data transmission. For instance IEC does not support short time stamps 3-byte format , the length of the various address elements is set to defined maximum values.
But in practice, vendors very often combine the IEC application layer with the IEC transport profile, without paying attention to these restrictions. This might then lead to problems, if a device strictly applies the standard.
Interoperability between devices by different vendors is ensured by the interoperability list, which is defined by the standard. In the list, the function range is defined for each device by marking the applicable functions.
The common denominator between different vendor lists defines the possible function range. The biggest advantage of IEC is that it enables communication via a standard network, which allows simultaneous data transmission between several devices and services.
Issues that remain to be dealt with are the definition of communication with redundant systems or networks and, with the use of the internet, data encryption. On-demand transmission e. Spontaneous transmission e. Direct command transmission with select before operate Clock synchronization File Transfer.
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Deutsch English. IEC Supported Information Types. Control Direction.
Monitoring Direction. Single indication [1 Bit] with quality Single indication [1 Bit] with quality and time tag Double indication [2 bit] with quality Double indication [2 bit] with quality and time tag Measured scaled value with quality Measured scaled value with quality and time tag Measured normalized value with quality Measured normalized value with quality and time tag Measured floating point value with quality Measured floating point value with quality and time tag Bitpattern [32 bit] with quality Bitpattern [32 bit] with quality and time tag Counter value with quality Counter value with quality and time tag Step position value with quality Step position value with quality and time tag Event of protection equipment with quality and time tag.
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What is IEC 104?
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