Page back system and method for remote paging in a control system

• US 6,745,090 B1
• Filed: 07/14/2000
• Issued: 06/01/2004
• Est. Priority Date: 07/14/2000
• Status: Expired due to Term

• Current Assignee: Rockwell Technologies, LLC (Teledyne Technologies Incorporated)
• Original Assignee: Rockwell Automation Technologies Incorporated (Rockwell Automation, Inc.)
• Inventors: Malizia, Samuel John Jr.
• Primary Examiner(s): PATEL, RAMESH B
• Application Number:
  US09/616,254
• Time in Patent Office: 1,418 Days
• Field of Search: 700/9, 700/17, 700/18, 700/19, 700/20-23, 700/56, 700/65-66, 700/83-88, 345/418-419, 345/420, 345/421, 709/108, 709/217, 709/220, 709/205, 712/28, 712/29
• US Class Current: 700/65
• CPC Class Codes: G05B 19/0423 Input/output
• CPC Class Codes: G05B 19/054 Input/output
• CPC Class Codes: G05B 2219/15018 Communication, serial data transmission, modem
• CPC Class Codes: G05B 2219/25175 Modem, codec coder decoder
• CPC Class Codes: G05B 2219/25217 Configure communication protocol, select between several
• CPC Class Codes: G05B 2219/25222 Mailbox, email, mail system

Abstract

The invention comprises a modem apparatus adapted to provide full messaging and communications interface between a control device and a communications medium such as a telephone line. The modern can comprise an interface adapted to communicate directly with a control system device, such as a programmable logic controller (PLC), using a communications protocol compatible with the normal network communications used in a distributed control system. The apparatus advantageously interfaces directly with unmodified control system devices, providing the ability to send and receive messages from remote devices or personnel via a communications medium. The invention also comprises a control system including a modem device providing full communications between a control device and remote personnel and/or devices. The apparatus can further be operative to monitor certain control conditions via communications with the control device, and to create and transmit messages across a communications medium according to the monitored control conditions.

Claims

1. A communications apparatus for communicating with an industrial control device and a remote device via a communications medium, comprising:

a first communications interface operative to communicate with the industrial control device using a first communications protocol;

a second communications interface operative to communicate with the remote device via the communications medium using a second communications protocol;

a processor in electrical communication with the first and second communications interfaces and operative to exchange messages with the industrial control device and the communications medium via the first and second communications interfaces; and

a switch in electrical communication with the processor and having a first switch state and a second switch state, and wherein the first communications interface selectively communicates using one of the first communications protocol and a third communications protocol according to the switch state, whereby the communications apparatus can be programmed via a programming message from a programming device connected to the first communications interface using the third communications protocol when the switch is in the second switch state.

2. The apparatus of claim 1, wherein the first communications protocol is the Allen-Bradley DF1 protocol, wherein the second communications protocol is the Telocator Alphanumeric Paging Protocol, and wherein the third communications protocol is ASCII.

3. The apparatus of claim 1, wherein the first communications protocol is the Allen-Bradley DF1 protocol and wherein the second communications protocol is the Telocator Alphanumeric Paging Protocol.

4. The apparatus of claim 1, wherein the communications apparatus is further adapted to receive programming messages from the communications medium via the second communications interface, whereby the communications apparatus may be programmed via a programming message from a programming device connected to the communications medium.

5. The apparatus method of claim 1, wherein the message comprises a text component and a data component.

6. The apparatus of claim 5, wherein the text component includes a text string obtained from a memory, and the data component comprises a process variable received from the industrial control device.

7. The apparatus of claim 1, wherein the communications apparatus is adapted to receive a programming message from the communications medium via the second communications interface and to transmit the programming message to the industrial control device via the first communications interface, whereby the industrial control device may be programmed by a programming device connected to the communications medium.

8. The apparatus of claim 1, wherein the communications apparatus is adapted to receive a first message from a first device connected to the communications medium via the second communications interface and to transmit the first message to the industrial control device via the first communications interface, and wherein the communications apparatus is adapted to receive a second message from the industrial control device via the first communications interface and to transmit the second message to the first device connected to the communications medium via the second communications interface, whereby the industrial control device may communicate with the first device connected to the communications medium.

9. The apparatus of claim 1, wherein the first communications interface comprises a modem, and the second communications interface comprises an RS-232 port.

10. An industrial control system for controlling a process, comprising:

a communications device having a first communications interface operative to communicate using a first communications protocol, and a second communications interface operative to communicate using a second communications protocol;

a control device having a third communications interface adapted for removable connection with the first communications interface and operative to communicate with the communications device using the first communications protocol, and an output operative to interface with a controlled process;

a communications medium operatively connected to the second communications interface and adapted to communicate with the communications device using the second communications protocol;

wherein the control device is adapted to send trigger information to the communications device, and wherein the communications device is adapted to selectively construct and transmit a message via the second communications interface according to the trigger information.

11. The industrial control system of claim, 10, wherein the communications device further comprises a switch having a first switch state and a second switch state, and wherein the first communications interface of the communications device is further adapted to selectively communicate using one of the first communications protocol and a third communications protocol according to the switch state.

12. The industrial control system of claim 11, further comprising a programming device with a fourth communications interface adapted for removable connection with the first communications interface of the communications device and operative to communicate with the communications device via the first communications interface using the third communications protocol, whereby the communications device may be programmed via programming messages from the programming device via the first and fourth communications interfaces using the third communications protocol.

13. The industrial control system of claim 12, wherein the first communications protocol is the Allen-Bradley DF1 protocol and wherein the second communications protocol is the Telocator Alphanumeric Paging Protocol.

14. The industrial control system of claim 10, wherein the first communications protocol is the Allen-Bradley DF1 protocol and wherein the second communications protocol is the Telocator Alphanumeric Paging Protocol.

15. The industrial control system of claim 10, wherein the communications device is further adapted to receive programming messages from the communications medium via the second communications interface, whereby the communications device may be programmed via the communications medium.

16. The industrial control system of claim 10, wherein the message comprises a text component and a data component.

17. The industrial control system of claim 16, wherein the data component comprises a process variable received from the control device.

18. The industrial control system of claim 10, wherein the communications device is adapted to receive a programming message from the communications medium via the second communications interface and to transmit the programming message to the control device via the first communications interface, whereby the control device may be programmed by a programming device connected to the communications medium.

19. The industrial control system of claim 10, wherein the communications device is adapted to receive a first message from a first device connected to the communications medium via the second communications interface and to transmit the first message to the control device via the first communications interface, and wherein the communications device is adapted to receive a second message from the control device via the first communications interface and to transmit the second message to first device connected to the communications medium via the second communications interface, whereby the control device may communicate with the first device connected to the communications medium.

20. In an industrial control communications device, a method for sending a message from a control device to a remote device via a communications medium, comprising:

obtaining trigger information via a first communications interface from the control device;

determining if a trigger condition exists according to the trigger information;

if a trigger condition exists, correlating the trigger condition with a data variable;

obtaining a data variable from the control device via the first communications interface;

creating a pager message including a text string and the data variable; and

transmitting the pager message to a remote device via a second communications interface and the communications medium using a second communications protocol.

21. The method of claim 20, wherein the industrial control communications device includes a switch having a first state and a second state, further comprising:

selectively communicating via the first communications interface using one of the first communications protocol and a third communications protocol according to the switch state;

whereby the communications apparatus may be programmed via a programming message from a programming device connected to the first communications interface using the third communications protocol when the switch is in the second switch state.

22. The method of claim 21, wherein the first communications protocol is the Allen-Bradley DF1 protocol and wherein the second communications protocol is the Telocator Alphanumeric Paging Protocol.

23. The method of claim 20, further comprising receiving a programming message from the communications medium via the second communications interface, whereby the industrial control communications device may be programmed via the programming message from a programming device connected to the communications medium.

24. The method of claim 20, further comprising:

receiving a programming message from the communications medium via the second communications interface; and

transmitting the programming message to the control device via the first communications interface, whereby the control device may be programmed by a programming device connected to the communications medium.

25. The method of claim 20, further comprising:

receiving a first message from a first device connected to the communications medium via the second communications interface;

transmitting the first message to the control device via the first communications interface;

receiving a second message from the control device via the first communications interface; and

transmitting the second message to the first device connected to the communications medium via the second communications interface;

whereby the control device may communicate with the first device connected to the communications medium.

26. A communications device for sending a pager message according to a control device condition, comprising:

means for obtaining trigger information via a first communications interface from the control device;

means for determining if a trigger condition exists according to the trigger information;

means for correlating the trigger condition with a data variable if a trigger condition exists;

means for obtaining a data variable from the control device via the first communications interface;

means for creating a pager message including a text string and the data variable; and

means for transmitting the pager message to a remote device via a second communications interface and the communications medium using a second communications protocol.