What are the advantages of using a PLC over conventional relay controls? a) Programming a PLC is easier than wiring a relay control panel; PLCs c...
a) Programming a PLC is easier than wiring a relay control panel; PLCs can be reprogrammed, whereas conventional controls must be rewired and often discarded; PLCs take up less space than relay control panels; reliability is higher and maintenance is easier; PLCs can be connected to computer systems more easily than relays; PLCs can perform a greater variety of control functions than relay controls.
b) PLCs are less reliable than relay controls; PLCs take up more space than relay control panels; programming a PLC is more difficult than wiring a relay control panel; PLCs cannot be reprogrammed; PLCs cannot be connected to computer systems.
c) PLCs are more expensive than relay controls; PLCs take up more space than relay control panels; programming a PLC is more difficult than wiring a relay control panel; PLCs cannot be reprogrammed; PLCs cannot be connected to computer systems.
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Ed 
A alternativa correta é a letra A) Programming a PLC is easier than wiring a relay control panel; PLCs can be reprogrammed, whereas conventional controls must be rewired and often discarded; PLCs take up less space than relay control panels; reliability is higher and maintenance is easier; PLCs can be connected to computer systems more easily than relays; PLCs can perform a greater variety of control functions than relay controls. As vantagens de usar um PLC (Controlador Lógico Programável) em relação aos controles de relé convencionais são várias, como a facilidade de programação, a possibilidade de reprogramação, a economia de espaço, a maior confiabilidade e facilidade de manutenção, a facilidade de conexão com sistemas de computador e a capacidade de executar uma variedade maior de funções de controle do que os controles de relé.
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