Industrial control system with integrated circuit elements partitioned for functional safety and employing watchdog timing circuits
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05B-009/02
G05B-019/042
H03K-017/689
G06F-001/28
H03K-019/007
H04L-025/02
출원번호
US-0644515
(2015-03-11)
등록번호
US-9651931
(2017-05-16)
발명자
/ 주소
Hopsecger, Edward C.
Vazach, Joseph G.
출원인 / 주소
Rockwell Automation Technologies, Inc.
대리인 / 주소
Boyle Fredrickson, S.C.
인용정보
피인용 횟수 :
1인용 특허 :
5
초록▼
Safety and/or reliability may he improved in industrial control systems by optimally utilizing integrated circuit elements to reduce the amount of components required and to provide cross monitoring. In one aspect, circuitry that is part of an Integrated Circuit (IC) for controlling a first channel
Safety and/or reliability may he improved in industrial control systems by optimally utilizing integrated circuit elements to reduce the amount of components required and to provide cross monitoring. In one aspect, circuitry that is part of an Integrated Circuit (IC) for controlling a first channel may also be used to monitor and provide safe operation for circuitry for controlling a second channel, and the circuitry for controlling the second channel may similarly be used to monitor and provide safe operation for the circuitry controlling the first channel. Circuitry may include a windowed watchdog circuit which may be used to monitor various events of the other circuitry, and safe operation may be provided by removing power from the other circuitry to provide a safe state.
대표청구항▼
1. An industrial control system comprising: first and second integrated circuit elements communicating first and second field signals, respectively, and first and second activity signals, respectively, the first and second integrated circuit elements each including a watchdog timing circuit; andfirs
1. An industrial control system comprising: first and second integrated circuit elements communicating first and second field signals, respectively, and first and second activity signals, respectively, the first and second integrated circuit elements each including a watchdog timing circuit; andfirst and second power shut-off components configured to selectively switch between 1) providing power for the first and second field signals, respectively, and 2) removing power from the first and second field signals, respectively,wherein the watchdog timing circuit of the first integrated circuit element receives the second activity signal from the second integrated circuit element, and the watchdog timing circuit of the second integrated circuit element receives the first activity signal from the first integrated, circuit element, andwherein the watchdog timing circuit of the first integrated, circuit element is configured to cause the second power shut-off component to selectively switch, and the watchdog timing circuit of the second integrated circuit element is configured to cause the first power shut-off component to selectively switch. 2. The industrial control system of claim 1, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to removing power upon detecting an edge of the received activity signal within a first predetermined amount of time. 3. The industrial control system of claim 1, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to removing power upon failing to detect an edge of the received activity signal within a second predetermined amount of time. 4. The industrial control system of claim 1, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to providing power upon detecting at least three edges of the received activity signal, wherein each edge is detected after a first predetermined amount of time and before a second predetermined amount of time. 5. The industrial control system of claim 1, wherein the first and second integrated circuit elements are separate Integrated Circuits. 6. The industrial control system of claim 5, wherein the separate Integrated Circuits are contained in a single package. 7. The industrial control system of claim 5, wherein the separate Integrated Circuits are contained in separate packages mounted on opposite sides of a system board. 8. The industrial control system of claim 1, wherein the first and second integrated circuit elements are part of a single Integrated Circuit. 9. The industrial control system of claim 8, wherein the first and second integrated circuit elements are electrically isolated from one another on the single Integrated Circuit. 10. The industrial control system of claim 8, wherein the single Integrated Circuit is a mixed signal Application Specific Integrated Circuit (ASIC) having both analog and digital circuits. 11. The industrial control system of claim 1, further comprising first and second screw terminals for communicating the first and second field signals, respectively'. 12. An industrial control system comprising: first and second integrated circuit elements communicating first and second field signals, respectively, and first and second activity signals, respectively, the first and second integrated circuit elements each including a watchdog tuning circuit; andfirst and second power shut-off components configured to selectively switch between 1) providing power for the first and second field signals, respectively, and 2) removing power from the first and second field signals, respectively,wherein the watchdog timing circuit of the first integrated circuit element receives the second activity signal from the second integrated circuit element, and the watchdog timing circuit of the second integrated circuit element receives the first activity signal from the first integrated circuit element,wherein the watchdog timing circuit of the first integrated circuit element is configured to cause the second power shut-off component to selectively switch, and the watchdog timing circuit of the second integrated circuit element is configured to cause the first power shut-off component to selectively switch,wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to removing power upon detecting an edge of the received activity signal within a first predetermined amount of time, and wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to removing power upon failing to detect an edge of the received activity signal within a second predetermined amount of time. 13. The industrial control system of claim 12, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to providing power upon detecting at least three edges of the received activity signal, wherein each edge is detected after a first predetermined amount of time and before a second predetermined amount of time. 14. The industrial control system of claim 12, wherein the first and second integrated circuit elements are part of a mixed signal Application Specific Integrated Circuit (ASIC) having both analog and digital circuits, and the first and second integrated circuit elements are electrically isolated from one another on the ASIC. 15. The industrial control system of claim 12, wherein the first and second integrated circuit elements are separate Integrated Circuits, and the separate Integrated Circuits are mounted on opposite sides of a system board. 16. An industrial control system comprising: first and second processors;first and second isolators in communication with the first and second processors, the first and second isolators providing electrical isolation for the first and second processors;first and second integrated circuit elements in communication with the first and second isolators, the first and second integrated circuit elements providing first and second field signals, respectively, and first and second activity signals, respectively, the first and second integrated circuit elements each including a watchdog timing circuit;first and second screw terminals in communication with the first and second field signals, respectively, andfirst and second power shut-off components configured to selectively switch between 1) providing power for the first and second field signals, respectively, and 2) removing power from the first and second field signals, respectively,wherein the watchdog timing circuit of the first integrated circuit element receives the second activity signal from the second integrated circuit element, and the watchdog timing circuit of the second integrated circuit element receives the first activity signal from the first integrated circuit element, andwherein the watchdog timing circuit of the first integrated circuit element is configured to cause the second power shut-off component to selectively switch, and the watchdog timing circuit of the second integrated circuit element is configured to cause the first power shut-off component to selectively switch. 17. The industrial control system of claim 16, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to removing power upon detecting an edge of the received activity signal within a first predetermined amount of time. 18. The industrial control system of claim 16, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to removing power upon failing to detect an edge of the received activity signal within a second predetermined amount of time. 19. The industrial control system of claim 16, wherein the watchdog timing circuits are each configured to cause the respective power shut-off component to selectively switch to providing power upon detecting at least three edges of the received activity signal, wherein each edge is detected after a first predetermined amount of time and before a second predetermined amount of time. 20. The industrial control system of claim 16, wherein the first and second integrated circuit elements are part of a mixed signal Application Specific integrated Circuit (ARC) having both analog and digital circuits, and the first and second integrated circuit elements are electrically isolated from one another on the ASIC.
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