CONTROL SYSTEM

• US 20110169345A1
• Filed: 01/13/2011
• Published: 07/14/2011
• Est. Priority Date: 01/14/2010
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Matsumoto, Tsuyoshi, Iida, Tatsuya
• Granted Patent: US 8,860,258 B2
• Time in Patent Office: Days
• US Class Current: 307/326
• CPC Class Codes: G05B 9/02 electric

Abstract

A control system has an input instrument that generates a signal indicating permission and prohibition of running of a load, a power-supply unit that is configured to supply driving power to the load when the load is permitted to run by an input signal from the input instrument, and to cut off the supply of the driving power to the load when the load is prohibited from running by the input signal, and a monitoring device that is configured to monitor the input instrument and the power-supply unit. The power-supply unit is configured to cut off the supply of the driving power to the load when monitoring result of the monitoring device indicates an abnormality of one of the input instrument and the power-supply unit. The control system is compatible with category 2 of ISO 13849-1.

Claims

1. A control system comprising:

an input instrument that generates a signal indicating permission and prohibition of running of a load;

a power-supply unit that is configured to supply driving power to the load when the load is permitted to run by an input signal from the input instrument, and to cut off the supply of the driving power to the load when the load is prohibited from running by the input signal; and

a monitoring device that is configured to monitor the input instrument and the power-supply unit,

wherein the power-supply unit is configured to cut off the supply of the driving power to the load when monitoring result of the monitoring device indicates an abnormality of one of the input instrument and the power-supply unit, and

wherein the control system is compatible with category 2 of ISO 13849-1.

2. The control system according to claim 1, wherein the monitoring device is not compatible with the category 2 of ISO13849-1.

3. The control system according to claim 2, wherein the input instrument includes:

a first signal generating unit that generates a first signal as the input signal input to the power-supply unit; and

a second signal generating unit that generates a second signal indicating the permission and prohibition of the running of the load, wherein

the power-supply unit outputs a third signal indicating the supply of the driving power to the load and the cutoff of the supply of the driving power, the supply of the driving power and the cutoff of the supply of the driving power being performed by the power-supply unit, and

the monitoring device monitors the input instrument and the power-supply unit based on the second signal and the third signal.

4. The control system according to claim 3, wherein the monitoring device monitors a time difference between timing of a change of the second signal and timing of a change of the third signal, when the load is permitted to run, and when the load is prohibited from running.

5. The control system according to claim 4, wherein the monitoring device detects that the input instrument and the power-supply unit are normal by detecting that the time difference falls within a predetermined time.

6. The control system according to claim 4, wherein the monitoring device detects that the input instrument is abnormal, when a state of the second signal is not changed so as to indicate that the load is prohibited from running within a reference time since a state of the third signal is changed so as to indicate that the supply of the driving power to the load is cut off.

7. The control system according to claim 4, wherein the monitoring device detects that the power-supply unit is abnormal, when a state of the third signal is not changed so as to indicate that the driving power is supplied to the load within a reference time since a state of the second signal is changed so as to indicate that the load is permitted to run.

8. The control system as in claim 1,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

9. The control system according to claim 8, further comprising a control device that is configured to control to put the first relay in the opened state and the closed state according to the input signal from the input instrument.

10. The control system as in claim 1, wherein the load is a motor, and the power-supply unit is a servo driver that drives the motor.

11. The control system as in claim 2,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

12. The control system as in claim 3,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

13. The control system as in claim 4,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

14. The control system as in claim 5,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

15. The control system as in claim 6,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

16. The control system as in claim 7,

wherein the power-supply unit includes first and second contactors that are inserted in and connected to a feeding pathway between the load and the power-supply unit, and

wherein the first contactor includes:

a first relay that is provided in the feeding pathway to become an opened state and a closed state according to the first signal; and

a second relay that is opened and closed independently of the first relay to generate the third signal.

17. The control system as in claim 2, wherein the load is a motor, and the power-supply unit is a servo driver that drives the motor.

18. The control system as in claim 3, wherein the load is a motor, and the power-supply unit is a servo driver that drives the motor.

19. The control system as in claim 4, wherein the load is a motor, and the power-supply unit is a servo driver that drives the motor.

20. The control system as in claim 5, wherein the load is a motor, and the power-supply unit is a servo driver that drives the motor.