US 12,332,642 B2
Fault tolerant interface for safety controls
Ted W. Sunderland, Washington, MO (US); Nicolas G. Sparacello, Washington, MO (US); and Zachary R. Wright, Wildwood, MO (US)
Assigned to Parker-Hannifin Corporation, Cleveland, OH (US)
Appl. No. 17/788,376
Filed by Parker-Hannifin Corporation, Cleveland, OH (US)
PCT Filed Mar. 29, 2021, PCT No. PCT/US2021/024552
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/202322, PCT Pub. Date Oct. 7, 2021.
Claims priority of provisional application 63/001,621, filed on Mar. 30, 2020.
Prior Publication US 2023/0032795 A1, Feb. 2, 2023
Int. Cl. G05B 9/02 (2006.01)
CPC G05B 9/02 (2013.01) 18 Claims
OG exemplary drawing
 
1. A fault tolerant interface, comprising:
a sensor configured to provide a signal corresponding to an environmental parameter, wherein the sensor operates in one of a normal state, or an alarm or fault state, wherein the signal corresponds to one of the normal state, or the alarm state or the fault state, wherein a value associated with the signal is predetermined; and
a safety control coupled to the sensor via a single wire, the safety control configured to transmit serial data to the sensor and receive serial data from the sensor via the single wire in the normal state, wherein the safety control is further configured to detect the alarm state or the fault state based on the signal prior to decoding the serial data;
wherein the safety control is configured to determine a data bit associated with a time interval between changes in a voltage level detected on the single wire, the time interval constituting an interval between a rising edge and a falling edge of the voltage level; and
wherein the safety control and sensor each transmits training bits to define the time interval associated with the data bit.