Control method for distributed type remote I/O control system performing automatic reset of output at start if no detected transmissions in specific period
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsAkihiro Yamashita, Junichi Mito
Life of this patent
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Abstract
A basic system of an NC unit and a distributed type remote I/O unit executes time division signal transaction through a half-duplex serial communication line, and in case where the distributed type remote I/O can not detect a receiving start state of a transmission frame from the basic system of the NC unit for a specified period of time, output is reset, and the basic system of the NC unit checks a type of and data setting in the distributed type remote I/O unit, and also checks a result for an input/output test and the current situation of communication according to a header pattern of a transmission frame.
Claims16
A distributed type remote I/O control system comprising:
- a control unit;
- at least one distributed type remote I/O unit;
- and
- a serial communication link connecting said control and said remote I/O unit, wherein said distributed type remote I/O unit monitors said serial communication link units to detect a start of reception of transmission frames from said control unit, and automatically resets an output from said distributed type remote I/O unit if said start of reception of transmission frames from said control unit is not detected within a specified period of time.
Dependencies are inferred from the claim text.