Patent ID: 6204776
Filing Date: 2001-03-20
Classification: G05B

Abstract:
A communication abnormality detecting/coping device comprising:a system device;a control/display device for conducting data communication with the system device;a first message transmission means for periodically transmitting a first message to the system device from the control/display device;a second message transmission means for periodically transmitting a second message to the control/display device from the system device;a communication system abnormality judging means for measuring an elapsed period of from a time of transmission of the first message by the first message transmission means to a time of reception of the second message transmitted from the second message transmission means and received by the control/display device to judge whether the measured elapsed period exceeds a preset period, or not; anda warning/coping means for warning the abnormality of a communication system or coping with the abnormality of the communication system when the communication system abnormality judging means judges that the measured elapsed period exceeds the preset period, whereinone of the second message transmission means and the first message transmission means sends an operation acknowledgement message for acknowledging that data communication is enabled between the system device and the control/display device, and the other thereof sends a reply message indicative of the acknowledgement of the operation acknowledgement message.