Today is...
Sunday, August 30, 2015
Welcome to Control.com, the global online
community of automation professionals.
Featured Video...
Featured Video
EtherCAT with CTC’s master lets your multivendor network play well together...
Our Advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive
Proximity sensor wiring to PLC/DCS
How to connect proximity sensors to DCS/PLC

Can someone let me know how to wire Namur, 2 wire and three wire pnp/npn proximity sensors to DCS/PLC assuming the field to be safe area.I would like to wire these sensors to conventional digital input cards of PLC/DCS.

Regards

VK Aggarwal

What kind of digital input card are you using? Is the power for 2-wire coming out of the PLC or is it external?

In general, for a 2-wire switch, the power goes to the positive terminal of the switch and the negative goes back to the PLC. Ensure the same reference is used on both PLC/DCS and the switch. For a 3-wire, the power and common goes to the switch and the signal back to the PLC/DCS. Even in this case its very important to maintain the reference voltage.

Hope this answers your question.

Regards,
Sriram.