Patent ID: 7610119
Filing Date: 2009-10-27
Classification: G05B

Abstract:
1. A plurality of safety controllers for providing a safety output to a target controlled system based on an input from an input device to thereby control operation of machine equipment, said safety controllers forming a safety circuit that supplies power to said machine equipment only when safety condition is maintained by said plurality of safety controllers, each of said safety controllers comprising: a plurality of safety output parts for transmitting a solid-state output as said safety output; a connection output part for transmitting a connection output to another safety controller; a control part for controlling said safety output and said connection output according to a program based on the input from said input device; a connection input part for receiving a connection output from another safety controller as a connection input; and a setting part for setting to enable and disable the connection input from said connection input part; wherein said control part controls said safety output and said connection output based on an input from said input device and connection input from said connection input part; wherein said connection output is a solid-state output for logical connection; wherein said control part controls said safety output and said connection output by carrying out logical calculations according to said program based on said input from said input device and said connection input from said connection input part; and wherein said control part controls said safety output and said connection output by disabling said connecting input if said setting part sets for disablement.