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Function Block (FB), Function ID, Signal number (Data ID)
(i) Signal symbols
Function Block (FB) is the software module and GR-series IED implements FBs for protections,
controls and communications. The function ID is unique ID described by six digits in
hexadecimal; each function ID represents each FB. Signal number (or Data ID) is the logical
address of the input and output data of the FB. The signal number (Data ID) consists of a
function ID and an element ID. The function ID is common within the FB; accordingly the
element ID will be shown to make description simple. The element ID is 10 hexadecimal and
it has the element ID name for easy to read. Figure 1.7-1 exemplifies the symbols, the function
ID, and the element ID. The table below shows the structure of the signal.
XX relay in phase-A is operated.
2. Signal monitoring point
Figure 1.7-1 Example of symbols and others
†Note that a PLC connection point can be shown with the function ID (123456) plus
element ID (8000011xxx0) expressed in 16 delights in hexadecimal, in some scheme
logics. The ‘PLC connection point’ could be found to search the letter ‘E’ of element ID
(i.e., ‘8000011Exx0’).
(ii) Data length (bit length of Data ID)
The user can read data length of a Data ID by seeing the seventh and eighth number of the
Data ID. Table 1.7-1 shows examples of 1~32-bits data.
Table 1.7-1 How to identify a Data length by seeing Element ID
8 (the beginning # of Element ID)
20 (First and second # of Element ID)
30 (First and second # of Element ID)
21 (First and second # of Element ID)
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