Sensor apparatus and monitoring method of control system using detected data from sensor apparatus
First Claim
1. A sensor apparatus for transmitting detected data through serial communications to an external, the sensor apparatus comprising:
- an update check data output device for outputting a value that differs from a previous value at each transmission;
an error check data calculator for calculating a value that allows to detect errors of the detected data and the update check data; and
a transmitter for transmitting the detected data, the update check data, and the error check data in a single transmission frame.
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Accused Products
Abstract
A counter (16) within a rotary encoder (21) outputs 8-bit count data CT for counting up at a period equal to or faster than the transmission period of positional data. When the rotary encoder (21) receives a communication frame for positional data request command STX at a receiving circuit (8) from a servo control apparatus (13), a sensor control computer (17) feeds a positional detected information including a destination address data DA indicating the servo control apparatus (13), a source address data SA, 40-bit positional detected data PS, 8-bit status data STS, and count data CT to a transmitting circuit (9). The transmitting circuit (9) adds a 16-bit cyclic code CRC allowing the detection of an error in the input data to the end of the input positional detected information, converts it to serial data as serial signal SRX, and transmits it to the servo control apparatus (13).
21 Citations
2 Claims
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1. A sensor apparatus for transmitting detected data through serial communications to an external, the sensor apparatus comprising:
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an update check data output device for outputting a value that differs from a previous value at each transmission;
an error check data calculator for calculating a value that allows to detect errors of the detected data and the update check data; and
a transmitter for transmitting the detected data, the update check data, and the error check data in a single transmission frame.
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2. A monitoring method of a control system in accordance with detected data from a sensor apparatus, the monitoring method comprising:
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a data transmitting step that the sensor apparatus transmits the detected data, an update check data of a value differing from a previous value at each transmission, and an error check data for allowing detection of errors of the detected data and the update check data, through serial communications to a control apparatus in a single transmission frame; and
a system monitoring step that is performed on the basis of an error of the update check data and an error of the error check data using the update check data and the error check data.
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Specification