System for identifying valid connections between electrical...

Details System for identifying valid connections between electrical... System for identifying valid connections between electrical...

2005-06-28

2005-06-28

Chung, Phung My (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C324S500000

Reexamination Certificate

active

06912678

ABSTRACT:
A method and circuitry for ensuring proper connections of a multi-wired cable bridging two electrical components in a programmable logic controller (PLC) system. The method involves: generating a pre-specified voltage level when the cable is properly connected, testing for the existence of this pre-specified voltage level, and generating an error signal if the pre-specified voltage level is not detected. The error signal generated by a component causes the component to electronically switch off its data connection via the multi-wired cable with the other component, and may cause the component to reset itself.

REFERENCES:
patent: 6557106 (2003-04-01), Yuzawa et al.
patent: 6640323 (2003-10-01), Akram

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