JPH0310535A - Fault notice circuit - Google Patents

Abstract

PURPOSE:To prevent the effect on the processing efficiency of the routine processing and the emergency processing implemented via a system by receiving a fault notice signal transferred to a control node via a system bus and receiving detailed fault information via a token ring when a controlled node is faulty. CONSTITUTION:When a fault takes place in a controlled node, an innode fault reception section 24 detecting the fault controls a fault notice signal transmission section 25 to send a fault notice signal via a system bus 6 and the detailed fault information is sent to a reception frame control section 21 and a detailed fault information storage circuit 23, in which the detailed fault information data is stored. Then a reception frame control section 21 receiving the detailed fault information starts the acquisition of a token on a token ring 7 and sends a token acquisition signal to a controlled node frame transmission section 22 and the detailed fault information storage circuit 23 when the token is acquired.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fault notification circuit for a network control system.

[Prior Art] Conventionally, in this type of fault notification circuit, when a control node receives a fault notification signal from a controlled node, the control node sends an order to a detailed fault information holding circuit in the controlled node via a system bus. Issued and reading detailed failure information.

[Problem to be solved by the invention M1 The conventional failure notification circuit described above issues an order via the system bus when a control node reads detailed failure information from a controlled node that is a failure node. During this time, there was a problem in that the processing efficiency of the control node's access to controlled nodes other than the faulty node via the system bus, that is, the processing efficiency of the control node's normal processing and urgent processing.

[Means for Solving the Problems] In order to solve such problems, the fault notification circuit according to the present invention is provided in a controlled node and transmits detailed fault information when this node is faulty. a receiving section;
a failure notification signal sending unit that receives detailed failure information and sends a failure notification signal to the control notebook via the system bus; and a token ring that receives detailed failure information and sends a token acquisition signal when a token is acquired; If the read completion bit of the frame signal sent by the own node is enabled, the reception frame control unit instructs to send a free token, and receives the token acquisition signal and sets the own node address and detailed failure information. and a controlled node frame transmitting unit that transmits a frame signal with a read completion bit set to a disabled state to the token ring, and transmits a fleet token to the token ring based on a fleet token transmission instruction. It is something.

[Operation] When a failure occurs in the controlled node, the intra-node failure reception unit detects this and sends detailed failure information to the failure notification signal transmission unit and the received frame control unit. The fault notification signal sending unit that receives this sends the fault notification signal to the control node via the system bus. In addition, the reception frame control unit that has received this detailed failure information starts acquiring tokens, and when the token is acquired, sends the own node address, detailed failure information, and information to the controlled node frame transmission unit via the token ring. A frame signal consisting of a read completion bit in a disabled state is transmitted.

On the other hand, the system bus control section in the control node that has received the fault notification signal via the system bus sends a node fault signal to the fault control section, and performs the system bus control performed by the faulty node based on the control signal from the fault control section. Prohibit access. Further, the failure control unit receives the node failure signal and instructs the address comparison unit to receive detailed failure information. As a result, when the address comparator receives the frame signal via the token ring and detects the address of the faulty node, it stores the contents of the detailed fault information part and sends the received frame signal to the control node frame transmitter. . Then, the control node frame transmitter transmits a frame signal with the read completion bit in the frame signal set to an enabled state on the token ring. In this way, when a controlled node fails, a failure notification signal is transferred to the control node via the system bus, and detailed failure information is transferred to the control node via the token ring.

[Example] Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the failure notification circuit of the present invention. In the figure, controlled nodes 2 to 5 are connected to a control node 1 by a system bus 6, and all nodes are connected to each other by a token ring 7 to form a loop. The control node 1 performs transmission control of the controlled nodes 2 to 5.

Next, FIGS. 2 to 4 will be explained. First, FIG. 2 is a block diagram of the failure processing unit 1o of the control node 1. In the figure, 11 is a system bus control section, 12 is a failure control section, 13 is an address comparison section, 14 is a detailed failure information reception section, 15 is a control node frame transmission section, and 16 is a central processing unit. Next, FIG. 3 is a block diagram of the failure processing section 20 of the controlled node 2. As shown in FIG. In the same figure,
21 is a received frame control section, 22 is a controlled node frame transmitting section, 23 is a detailed fault information holding circuit, 24 is an intra-node fault receiving section, and 25 is a fault notification signal sending section.

Next, FIG. 4 is a frame configuration diagram of data transmitted on the token ring 7. In the figure, 31 is a start delimiter, 32 is a source address field, 33 is a detailed failure information field, 34 is a read completion bit, and 35 is an end delimiter.

The detailed operation of the embodiment configuration as described above will be explained.

When a failure occurs within the controlled node 2, it is detected by the intra-node failure receiving section 24. The intra-node fault receiving unit 24 that has detected this fault controls the fault notification signal sending unit 25 to transmit a fault notification signal to the control node 1 via the system bus 6, and also sends this detailed fault information to the received frame. The detailed fault information data is sent to the control unit 21 and the detailed fault information holding circuit 23, and the fault information holding circuit 23 stores this detailed fault information data. The reception frame control unit 21 that has received this detailed failure information starts acquiring tokens on the token ring 7, and when acquiring tokens, sends a token acquisition signal to the controlled node frame transmission unit 22 and the detailed failure reception and holding circuit 23. Send out. The controlled node frame transmitter 22 that has received this signal sets the detailed fault information data stored in the detailed fault reception and holding circuit 23 in the detailed fault information section 33 of the frame, and sets its own node address in the source address section 32. At the same time, the read completion bit 34 is set to disable, and a start delimiter 31 and an end delimiter 35 are further added to this set frame, and the frame is sent onto the token ring 7.

On the other hand, upon receiving the failure notification signal from the controlled node 2 via the system bus 6, the system bus control unit 11 in the control node 1 sends a node failure signal to the failure control unit 12. Based on this, the fault control unit 12 sends a control signal to the system bus control unit 11 to prohibit access via the system bus from the controlled node 2, which is the faulty node, and also causes the address comparison unit 13 to control the controlled node. Notify node 2 of failure. The address comparator 13 that has received this notification receives the frame transmitted on the token ring 7 and uses the faulty node address that sent the fault notification signal from this frame, that is, the source address section 32
Find the address of. Further, the failure control unit 12 that has received the failure notification signal sends an interrupt request signal to the central processing unit 16, and upon receiving an interrupt permission signal from the central processing bag W16, sends an interrupt request signal to the address comparison unit 13 and detailed failure information reception unit 14. Instructs to receive detailed failure information. The address comparison unit 13 that received the instruction to receive this detailed failure information,
When the fault node address searched above is detected, the contents of the detailed fault information section 33 in the received frame signal are stored in the detailed fault information receiving section 14, and the received frame signal is transferred to the control node frame transmitting section. Send on 15th.

The control node frame transmitter 15 enables the reading completion bit 34 of this frame signal and transmits it onto the token ring 7. The detailed fault information stored in the detailed fault information receiving section 14 is analyzed and processed by the central processing unit 16.

Furthermore, when the received frame control unit 21 in the controlled node receives the frame sent out by the self-node that has circulated, and the read completion bit 34 is enabled, it sends a frame signal with the acquired token as a free token. The controlled node frame transmitting unit 22 is instructed to relay the frame onto the token ring 7, and the controlled node frame transmitting unit 2
2 relays a frame signal made up of 7 Lee tokens according to this instruction. Then, when receiving the frame signal transmitted by the own node again, the reception frame control unit 21 instructs the controlled node frame transmission unit 22 to remove this frame signal from the token ring 7, and transmits the controlled node frame. The unit 22 removes this frame signal from the token ring 7 according to this instruction.

[Effects of the Invention] As explained above, according to the fault notification circuit according to the present invention, the fault notification signal transferred to the Mgi node when the target 1iIJ control node has a fault is transmitted via the system bus,
Since detailed fault information is configured to be sent via Token Ring, detailed fault information with a large amount of information is transferred via Token Ring, which affects the processing efficiency of normal processing and emergency processing performed via the system bus. It has the effect of not giving.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the failure notification circuit of the present invention, FIGS. 2 and 3 are block diagrams for explaining the operation, and FIG. 4 is a frame diagram. 1...Control node, 2-5...Controlled node,
6...System bus, 7...Token ring,
11...System bus control unit, 12...Fault management m unit, 13...Address comparison unit, 14...Detailed failure information receiving unit, 15...Control node frame transmitting unit , 16... Central processing unit, 21... Reception frame control unit, 22 is a controlled node frame transmission unit, 23
. . . Detailed fault information holding circuit, 24 . . . Intra-node fault receiving section, 25 is a fault notification signal sending section, 32 . . .
Sender address section, 33... Detailed failure information section, 34
...Reading completion bit. Figure 1 Figure 2 0

Claims (1)

[Claims] A network control system in which a control node and a plurality of controlled nodes are interconnected by a token ring and a system bus, and transmission between the control node and the controlled nodes is controlled under the control of the control node. The fault notification circuit includes: an in-node fault receiving section in the controlled node that sends detailed fault information when this node is faulty; a failure notification signal sending unit that sends a failure notification signal to the user; and a failure notification signal sending unit that sends a token acquisition signal when a token is acquired by receiving the detailed failure information, and completes reading of the frame signal sent by the own node on the token ring. a reception frame control unit that instructs free token transmission if the bit is in an enabled state, and a reception frame control unit that receives the token acquisition signal and sets its own node address and the detailed failure information, and disables the read completion bit. a controlled node frame transmitting unit that transmits a frame signal set to 0 to the token ring and transmits a free token to the token ring based on the free token transmitting instruction; a system bus control unit that receives the failure notification signal and sends a node failure signal, and receives a control signal to prohibit access to the system bus by the failure node; a fault control unit that sends a control signal and instructs to receive the detailed fault information;
When a frame signal is received based on the instruction to receive the detailed fault information and a match is detected between the address in the frame signal and the address of the faulty node, the content in the frame is stored and the frame is an address comparison unit that sends out a signal; and a control node frame transmission unit that sets the read completion bit in the frame signal sent from the address comparison unit to the enabled state and sends it to the token ring; A fault notification circuit characterized in that during fault processing, a fault notification signal is transferred via a system bus, and detailed fault information is transferred via a token ring.