JPH0313613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reporting fault information from a device controlled by programmable input/output IO instructions.

Conventionally, methods for notifying failure information when a failure occurs from a device controlled by programmable IO instructions range from simple methods that notify the presence or absence of a failure using only a signal indicating whether the instruction execution is successful, to complex methods. One method is to have several bits of status information and notify the control device of this as return data or a condition code that the control device generally has.

On the other hand, due to the increasing intelligence of peripheral devices in recent years, the instruction execution states of devices controlled by program IO instructions are diversifying, and there is also a growing demand for improved system reliability. It is necessary to immediately isolate the faulty part and maintain the system's normality, and the number of states of fault information from devices controlled by programmable IO commands is increasing.

However, in the control device, there is no increase in condition codes for other commands, and changing the software interface due to the above requirement causes problems with inheritance of existing software.
Also, including status information in the returned data increases the number of program steps in normal processing.
There was a problem in that the processing capacity during normal operation was reduced.

An object of the present invention is to solve the problems of the prior art described above and to provide a method for notifying a control device of detailed failure information.

In the present invention, relatively flexible interrupt information is used as a software interface, and multiple pieces of fault information are classified into several interrupt causes and notified to the control device, and detailed fault information is stored in a register. This method allows the information to be stored and read out as needed by the fault handling program.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention. In the figure, ADP indicates an interface adapter, and the control device CNT and the processing device PRC controlled by the control device CNT are well known and are not shown in the figure.

In this example, the status information (DAT in the figure) attached to the programmable IO instruction answer information (DAT in the figure) is
ACOD) has 3 bits and 8 states. Status information
ACOD is classified into interrupt signals ISA, ISB,
Converted to ISC and also non-response of processing unit PRC
It shall be classified as ISC.

ACOD 000...ISC notification 001...Normal 010 011ISA notification 100 101 110ISB notification 111...ISC notification The figure mainly shows the interface adapter ADP installed outside the control device CNT for the interface with the processing device PRC. Portions unrelated to the invention, such as transmission of control information, are omitted. The operation of the circuit shown in the figure will be explained below.

In ADP, 1 is the answer data register,
2 is an answer code register, which has a 3-bit configuration, and receives the answer information DAT and DAT respectively by the answer synchronization signal (ASYN) from the processing unit PRC.
Latch status information ACOD. 3 is a decoder,
Decode the output signal of answer code register 2. 4 is a timing circuit, 5 is a buffer gate,
Reference numerals 6, 7, and 8 are OR gates whose outputs serve as interrupt signals for the control device CNT.

Now, (1) data and ACOD = 001 from the processing device PRC for the control information sent from the control device CNT.
If the answer data is returned, the answer data is temporarily stored in the answer data register 11, then "001" is latched in the answer code register 2, and the answer data is sent to the decoder 3.
This is sent to the control device CNT to enable the buffer gate 5. The latch timing of this information is created by the timing circuit 4.
ASYN is given to the controller CNT.

(Normal) (2) When ACOD=010,011 Buffer gate 5 is not enabled this time,
The interrupt signal ISA is controlled by the OR gate 6.
CNT will be notified.

(3) When ACOD=100 to 110, the buffer gate 5 is not enabled, the signal is input only to the OR gate 7, and the ISB signal is input to the control device.
CNT will be notified.

(4) When ACOD=000, 1111 Similar to (2) and (3), the signal is input only to the OR gate 8, and the ISC signal is notified to the control device CNT.

(5) No response from processing unit The timing circuit 4 is enabled by the EN input when sending control information, and monitors the arrival of the ASYN signal. When the monitoring time overflows, an ISC signal is output through the OR gate 8.

The detailed failure information is stored in the answer code register 2, and the circuit for reading this information may be implemented by normal register reading, and the explanation thereof will be omitted.

As explained above, according to the present invention, not only can most existing software be inherited, except for fault handling programs that are originally new, but also the present invention can be implemented without increasing the number of dynamic steps during normal operation.
The interrupt function can be used to switch retry devices when a failure occurs.

Furthermore, by uniformly setting interrupt information and software countermeasures, it becomes possible to implement the failure information analysis function in hardware, contributing to the simplicity of the software configuration.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. ADP: Interface adapter, CNT: Control device, PRC: Processing device, 1: Answer data register, 2: Answer code register, 3: Decoder, 4: Timing circuit, 5: Buffer gate,
6-8: Or gate.

Claims (1)

[Claims] 1 Consisting of a control device and one or more controlled devices, the control device controls the controlled device by programmable input/output commands, and the controlled device responds to the commands with a command common to the controlled devices. In a fault notification method that returns response information that includes state information defined in part, means that is interposed between the control device and the controlled device, Identifying the presence or absence of fault information, and if the fault information is identified, converting the identified fault information into an interrupt signal corresponding to the content of the fault information, and notifying the control device of the interrupt signal. At the same time, the detailed information of the status information is temporarily stored so that the detailed information of the status information can be read by the control device, while if no failure is identified,
A fault notification system characterized in that the control device is made to return response information excluding the status information, and the response information is sent and received via the means.