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Function:
1 Application
Different protection, control, and monitoring functions within the
REx 5xx protection, control and monitoring terminals are quite independ-
ent as far as their configuration in the terminal is concerned. You cannot
enter and change the basic algorithms for different functions, because they
are located in the digital signal processors and extensively type tested.
You can configure different functions in the terminals to suit special
requirements for different applications.
For this purpose, you need additional logic circuits to configure the termi-
nals to meet your needs and also to build in some special logic circuits,
which use different logic gates and timers.
2Design
The number of blocks of configurable logic circuits available in REL 531
and REC 561 are:
REL 531
Fast execution cyclicity (typical 5 ms)
• 20 INV (INVerters)
• 40 OR gates
• 10 AND gates
• 10 timers (for On or Off delay)
• 10 pulses
Slow execution cyclicity (typical 200 ms)
• 5 SR (Set-Reset)
REC 561
Same as for REL 531 with these execution times and additional blocks:
Fast execution cyclicity (typical 8 ms)
• 40 Pulses
Slow execution cyclicity (typical 200 ms)
• 59 INV (INVerters)
• 159 OR gates
• 239 AND gates
• 39 XOR (eXclusive OR)
• 6 MOVE (3 MOF and 3 MOL)
4
Configurable logic
1MRK 580 161-XEN
Version 1.0-00
October 1996
Basic
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