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2.7 PLC (Programmable Logic Controller) Function
GRD150 is provided with PLC function allowing user-configurable sequence logics on binary
signal. The sequence logics (e.g. trip, interlock and alarm) with timers, flip-flops, AND, OR, NOT
logics, etc. can be produced by using the PC software "PLC editor tool" and linked to the signal
corresponding to element or binary circuit.
The PLC function is available to produce the following logics and signals and to assign them to BI
and BO:
-
select & operation control condition, interlock condition
-
tripping logic circuit
-
protection logic circuit, protection block circuit
-
external alarm circuit
-
initiation trigger of disturbance record
-
etc.
Configurable binary inputs, binary outputs and LEDs are programmed by the PLC function to
perform above. And the temporary signals (No.2816 to No.3071) are provided for complicated
logics or using user-configured signal in many logics.
For example, when "GEN.TRIP" signal of protection is linked to the binary output auxiliary relay
TRP1 of IO1 module (IO1-TP1), the PLC logic is assigned to the signal No. 485 of GEN.TRIP for
PLC input and the signal No. 2560 of IO1-TP1 for PLC output as shown in Figure 2.7.1 by the
PLC editor tool. For PLC editor tool, refer to PLC tool instruction manual.
Protection
PLC input
485
and
GEN.TRIP
Control
functions
Figure 2.7.1
IO1
PLC output
PLC logic
2560
IO1-TP1
2561
IO1-TP2
2562
IO1-BO1
2567
IO1-FAIL
Binary Output Circuit
⎯
⎯
121
6 F 2 S 0 8 4 2
Auxiliary relay
TRP1
TRP2
Binary
output
signals
BO1
FAIL
1
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