Safety network system, safety slaves unit, safety controller...

Details Safety network system, safety slaves unit, safety controller... Safety network system, safety slaves unit, safety controller...

2007-01-09

2007-01-09

Pham, Thomas (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Sequential or selective

C700S003000, C709S208000

Reexamination Certificate

active

10478518

ABSTRACT:
A safety PLC1and at least a safety slave unit2are connected through a safety network3. The safety slave unit has the safety information transmission function for transmitting the safety information for determining whether a safe state prevails or not and the unsafety information transmission function for transmitting the unsafety information containing no safety information. The unsafety information transmission function transmits the unsafety information on condition that the safety slave unit is in a safe state. Specifically, in the case where it is determined that no safe state prevails at the timing of transmitting the unsafety information, the unsafety information is not sent but the safety is transmitted. A safety controller, upon receipt of the unsafety information, estimates that the safety slave unit at the transmitting end of the particular unsafety information is in a safe state.

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