220 VDC Binary Input

Dear All

I have an application contains a 220 VDC Relay. This relay is energized by a Binary output signal from PLC. I need a supervision circuit to determine if the wiring path toward 220 VDC relay is ok or not.

To constructing such a supervision circuit, I was thinking about a parallel circuit (Like attachment) with a binary input channel. When a wire break occurs, DI channel will be de-energized and this can be recognizable via PLC Logic. Because of some engineering and operational restrictions, I have to keep this solution. But, the problem:

As I know, SIEMENS does not have any option for 220 VDC DI Module. So, I thought about inserting a resistor for voltage drop and using an isolated 24 VDC binary input (6ES7321-1CH00-0AA0) followed by a Diode to preventing reverse currents from 220 VDC relay. Is it a proper design or you have a better suggestion?

Sincerely

Mazdak

mazdak

Dear All

I have an application contains a 220 VDC Relay. This relay is energized by a Binary output signal from PLC. I need a supervision circuit to determine if the wiring path toward 220 VDC relay is ok or not.

To constructing such a supervision circuit, I was thinking about a parallel circuit (Like attachment) with a binary input channel. When a wire break occurs, DI channel will be de-energized and this can be recognizable via PLC Logic. Because of some engineering and operational restrictions, I have to keep this solution. But, the problem:

As I know, SIEMENS does not have any option for 220 VDC DI Module. So, I thought about inserting a resistor for voltage drop and using an isolated 24 VDC binary input (6ES7321-1CH00-0AA0) followed by a Diode to preventing reverse currents from 220 VDC relay. Is it a proper design or you have a better suggestion?

Sincerely

Mazdak