Difference Between a Transistor PLC & a Relay PLC

[Towerlight]

Hi...can anyone share with me what is the difference between a Transistor PLC & a Relay PLC? As I only uses a Transistor PLC i do not know much about a Relay PLC.
Thanks for viewing anyway.
Cheers

 

[rPraveenkum]

looks like output type

Transistor PLC & a Relay PLC

not PLC

the Question should me the PLC output type relay or transistor

 

[Tom Jenkins]

A transistor output is a solid state device, and is usually only capable of switching low current DC, most often 24 VDC. They are capable of very fast operation.

A relay output has a physical relay on the output board, and the switching is done by physical contacts that open and close. They can switch AC or DC and higher voltages - usually up to 230 VAC.

Which you choose depends on the device that the output is switching.

 

[Gerry M]

Also, the expected contact life on the relay can be an issue if you are designing a low cycle time machine(few seconds per cycle). Where as transistor or other solid state outputs usually have a much longer life span. Just look at the PLC output card specifications for details.

I usually use relays because of the flexibility among voltages, only a few times I have used solid state outputs mostly due to the expected lifetimes.

 

[Towerlight]

Hey guys,

Thanks for the infomations above... Really appreciate that.