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Logic function blocks
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Different protection, control, and monitoring functions within the REx 5xx terminals
are quite independent as far as their configuration in the terminal is concerned. The user
cannot enter and change the basic algorithms for different functions, because they are
located in the digital signal processors and extensively type tested. The user can config-
ure different functions in the terminals to suit special requirements for different appli-
cations.
For this purpose, additional logic circuits are needed to configure the terminals to meet
user needs and also to build in some special logic circuits, which use different logic
gates and timers.
Logical function blocks are executed according to their execution serial numbers. To
get an optimal solution select their execution serial numbers in consequtive sequence.
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The INV function block is used to invert the input boolean variable. The function block
(figure 6) has one input designated IVnn-INPUT where nn presents the serial number
of the block. Each INV circuit has one output IVnn-OUT.
IVnn
INPUT
OUT
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