We have systems, where we use 24VDC with 0VDC polarity feeding the PLC inputs and 24VDC polarity as common. The 0VDC polarity is isolated and 24 VDC polarity is grounded.But the drawing says 24VDC polarity to be 0VDC and the 0VDC polarity to be -24VDC. Does this make sense? If we connect a multimeter with red lead to + and black to common, then we would read 24VDC. Is there a reason why it is written this way in the drawing?
Your replies are appreciated.
Your replies are appreciated.