Method for intercontroller communications in a safety instrumented system or a process control system
First Claim
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1. An input/output (I/O) bus connection system for use in a process control system comprising:
- a first I/O card including two interfaces, wherein a first interface of the first I/O card is communicatively coupled to a first process controller via a first bus;
a second I/O card including two interfaces, wherein a first interface of the second I/O card is communicatively coupled to a second process controller via a second bus; and
an inter-controller communication link between the first I/O card and the second I/O card separate from the first and the second bus,wherein the second interface of the first I/O card and the second interface are communicatively coupled to the inter-controller communication link;
wherein the first process controller is configured to implement a control routine using one or more field devices by sending a control signal to one of the one or more field devices, via the first bus, and a further I/O card connected between the first bus and the one or more field devices, to provide coordinated process control functionality between the first process controller and the second process controller;
wherein the first process controller is configured to send a signal to the second process controller via the first bus, the first I/O card, the inter-controller communication link and the second I/O card;
wherein the first process controller is configured to determine whether one of a process parameter measurement signal, an alarm signal, or an event signal needs to be communicated to the second process controller;
wherein the first process controller is configured to determine whether the field device under the control of the second process controller is to be adjusted based on the first controller signal.
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Abstract
The claimed system provides an I/O card that is used to interface two process controllers over a communication line that is separate from a primary communication line connecting the two process controllers to a workstation. The process controllers can access the I/O cards in a similar manner to I/O cards used to connect to field devices. In this manner, the physical hardware and software architecture does not need to be modified for inter-controller communications. Inter-controller communications can be programmed as general I/O communication.
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Citations
37 Claims
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1. An input/output (I/O) bus connection system for use in a process control system comprising:
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a first I/O card including two interfaces, wherein a first interface of the first I/O card is communicatively coupled to a first process controller via a first bus; a second I/O card including two interfaces, wherein a first interface of the second I/O card is communicatively coupled to a second process controller via a second bus; and an inter-controller communication link between the first I/O card and the second I/O card separate from the first and the second bus, wherein the second interface of the first I/O card and the second interface are communicatively coupled to the inter-controller communication link; wherein the first process controller is configured to implement a control routine using one or more field devices by sending a control signal to one of the one or more field devices, via the first bus, and a further I/O card connected between the first bus and the one or more field devices, to provide coordinated process control functionality between the first process controller and the second process controller; wherein the first process controller is configured to send a signal to the second process controller via the first bus, the first I/O card, the inter-controller communication link and the second I/O card; wherein the first process controller is configured to determine whether one of a process parameter measurement signal, an alarm signal, or an event signal needs to be communicated to the second process controller; wherein the first process controller is configured to determine whether the field device under the control of the second process controller is to be adjusted based on the first controller signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 33, 34, 35)
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10. A method of communicating between two process controllers within a process control system comprising:
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transmitting a first controller signal from a first process controller to a first I/O device via a first bus, wherein the first bus is communicatively coupled to the first process controller and the first I/O device; transmitting the first controller signal from the first I/O device to a second I/O device via a first communication network that is separate and independent from the first bus; transmitting the first controller signal from the second I/O device to a second process controller via a second bus separate and independent from the first bus and the first communication network, wherein the second bus is communicatively coupled to the second process controller and the second I/O device; with the first process controller, implementing a control routine using one or more field devices by sending the first controller signal to one of the one or more field devices via the first bus and a further I/O card connected between the first bus and the one or more field devices to provide coordinated process control functionality between the first process controller and the second process controller; with the first process controller, sending a signal to the second process controller via the first bus, the first I/O card, the inter-controller communication link and the second I/O card; determining at the first process controller whether a field device under the control of the second process controller is to be adjusted based on the first controller signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 36)
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20. A process control system comprising:
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a host computer arranged to send and receive process control messages; a first controller operatively connected to the host computer via a first communication network and adapted to perform process control functionality; a first I/O card operatively connected to the first controller via a first bus and adapted for operative communication with a process control related field device; a second I/O card operatively connected to the first controller via the first bus and adapted for operative communication with a third I/O card, the second I/O card and third I/O card operatively connected via a second communication network separate from the first bus and the first communication network; wherein the first controller is configured to implement a control routine using one or more field devices by sending a control signal to the process control related field device via the first bus and the first I/O card to provide coordinated process control functionality between the first controller and the host computer; wherein the first controller is configured to send a further signal to a second controller via the first bus, the second I/O card, the second communication network and the third I/O card; determining at the host computer whether one or more process parameter measurement signals needs to be communicated to a second controller; determining at the host computer whether a field device under the control of the second controller is to be adjusted based on the host computer signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 37)
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Specification