Safety network system, safety slave, and communication method

Details Safety network system, safety slave, and communication method Safety network system, safety slave, and communication method

2006-05-23

2006-05-23

Patel, Ramesh (Department: 2121)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Plural processors

C700S002000, C700S005000, C700S021000, C700S079000, C700S080000, C709S208000, C709S209000, C709S210000, C709S211000, C710S110000

Reexamination Certificate

active

07050860

ABSTRACT:
The safe PLC1and the safe slaves2are connected with each other via the safe network3. The safe PLC has the function of transmitting a request of safety information by broadcast message to the safe slaves. The safe slaves are each provided with a safety information transmission function for transmitting safety information indicative of whether the safe slave is in a safe condition or not; and a changing function for changing a priority of a transmission frame which carries the safety information. As a result, when the safe slaves send back safe responses at once in response to the broadcast message, safety information (danger) with a higher priority is transmitted ahead of others to the safe PLC.

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