Problem in wiring sinking plc output

Thread Starter

cawan

Joined Nov 2, 2011
2
halu, i have problem when try to wiring the output sinking plc.
the problem is when i give the supply to the plc, then all of the output will give the reading 24V even though all the port are NOT triggered.

I try to triggered one of the output and nothing change. Still same and get 24v reading.

some one can help me?

thanks in advnc
 

GetDeviceInfo

Joined Jun 7, 2009
1,666
If your output is sinking, then your port common connection(s) is wired to supply return to act as the drain.

This is not the typical approach in industry, as damaged wiring may lead to actuation. Sourcing is the more common approach.
 

Thread Starter

cawan

Joined Nov 2, 2011
2
tqvm for your replying.

is it normal when all of the output port give the reading 24vdc even though i not triggered the port?
 

GetDeviceInfo

Joined Jun 7, 2009
1,666
tqvm for your replying.

is it normal when all of the output port give the reading 24vdc even though i not triggered the port?
this would be expected in a sinking type port, yes. When you output to the port, it will 'sink' the line down the common 'drain'. In other words, provide a low impedance path to the common terminal.
 
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