JPS6468042A - Communication method - Google Patents
Communication methodInfo
- Publication number
- JPS6468042A JPS6468042A JP62224072A JP22407287A JPS6468042A JP S6468042 A JPS6468042 A JP S6468042A JP 62224072 A JP62224072 A JP 62224072A JP 22407287 A JP22407287 A JP 22407287A JP S6468042 A JPS6468042 A JP S6468042A
- Authority
- JP
- Japan
- Prior art keywords
- data
- cpu
- port number
- cpus
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Hardware Redundancy (AREA)
- Multi Processors (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Small-Scale Networks (AREA)
Abstract
PURPOSE:To obtain normal response by constituting the titled method so that a response is returned only from a CPU which is in normal service at the time of a response in broadcasting communication to duplex CPUs. CONSTITUTION:At the time of reception, in case of a broadcasting communication in which data on a communication line 1 includes an virtual port number, the data is received by respective CPUs 62A-63B, when the port number coincides with duplex CPUs 2-4 to which the number itself belongs to, but the data is not received when the number does not coincide. In case of a one-to-one communication in which data on the communication line 1 includes a physical port number, the data is received, when the port number coincides with the port number of one of the CPUs 62A-63B, but the data is not received when the number does not coincide. Therefore, data can be transmitted only to one CPU. At the time of transmission, in case the data is such one as including a virtual port number in broadcasting communication, when the CPU provided with the communication equipment being to transmit is a CPU in normal use, the data is transmitted to the communication line, but if said CPU is a CPU in waiting system, only a transmission end report is made to the very CPU. Therefore, either a program for normal use system or one for reserve system can operate without any discrimination, furthermore, data is transmitted only from the normal-use CPU of the duplex CPUs 2-4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62224072A JPS6468042A (en) | 1987-09-09 | 1987-09-09 | Communication method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62224072A JPS6468042A (en) | 1987-09-09 | 1987-09-09 | Communication method |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6211246A Division JPH07182190A (en) | 1994-09-05 | 1994-09-05 | Multi-duplex system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6468042A true JPS6468042A (en) | 1989-03-14 |
JPH0561820B2 JPH0561820B2 (en) | 1993-09-07 |
Family
ID=16808122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62224072A Granted JPS6468042A (en) | 1987-09-09 | 1987-09-09 | Communication method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6468042A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009217358A (en) * | 2008-03-07 | 2009-09-24 | Mitsubishi Electric Corp | Duplex programmable controller |
US11578390B2 (en) | 2018-02-26 | 2023-02-14 | Tupy S. A. | Gray cast iron alloy, and internal combustion engine head |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53106535A (en) * | 1977-02-28 | 1978-09-16 | Fujitsu Ltd | System control system |
-
1987
- 1987-09-09 JP JP62224072A patent/JPS6468042A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53106535A (en) * | 1977-02-28 | 1978-09-16 | Fujitsu Ltd | System control system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009217358A (en) * | 2008-03-07 | 2009-09-24 | Mitsubishi Electric Corp | Duplex programmable controller |
US11578390B2 (en) | 2018-02-26 | 2023-02-14 | Tupy S. A. | Gray cast iron alloy, and internal combustion engine head |
Also Published As
Publication number | Publication date |
---|---|
JPH0561820B2 (en) | 1993-09-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |