F
I'm shifting control system in a old system.
There are some old alarmpanels with outputs on them. These outputs are Opto couplers..
The problem is that the input on the PLC goes hi when there is no alarm ie it's inverted.
This should not be the case and it must be a result of different voltages.
The panels power supply is 24VAC
The PLC:s 24VDC (Different transformers)
The inputs of the PLC are driven by -6VDC.
The PLC is a SAIA PCD2
If someone has any idea about how i could get this to work please help me.
Fredrik
There are some old alarmpanels with outputs on them. These outputs are Opto couplers..
The problem is that the input on the PLC goes hi when there is no alarm ie it's inverted.
This should not be the case and it must be a result of different voltages.
The panels power supply is 24VAC
The PLC:s 24VDC (Different transformers)
The inputs of the PLC are driven by -6VDC.
The PLC is a SAIA PCD2
If someone has any idea about how i could get this to work please help me.
Fredrik