JPH02149125A - Pulse counter - Google Patents

Abstract

PURPOSE:To improve reliability in the calculation of a pulse integrated value by calculating a count increment value and the pulse estimation value by inputting a pulse calculation value outputted from a normal pulse count input device on the other side by a controller than a fault occurs in either on one side of two pulse counter input devices. CONSTITUTION:The two pulse count input devices 1 and 2 which output the pulse counted values and the controller 3 which controls the pulse count input devices are provided. The controller 3 calculates the count increment value and the pulse integrated value outputted from the normal pulse count input device on the other side when the fault occurs in the pulse counting device on one side. Therefore, it is not required to stop a pulse integration operation even when the fault occurs in the pulse count input device on one side, and also, no under and over is generated in the integrated value. In such a manner, it is possible to realize a pulse counter with high reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pulse counting device that integrates the number of pulses.

[Conventional technology]

A conventional pulse counting device is shown in FIG. In the same figure,
A is a main pulse counting circuit, B is a slave pulse counting circuit, C is a counting comparison circuit, and D is a control device.

Next, the operation of the device configured in this way will be explained. The pulse signal a is input to the main pulse counting circuit A and the sub pulse counting circuit B. Counting circuits A and B count the number of pulses of pulse signal a.

The pulse count value outputted from the main pulse counting circuit A is input to the control device, and the control device determines the count increment value Δb and the pulse integrated value C from the pulse count value. The slave pulse counting circuit B is a circuit for determining whether the operation of the main pulse counting circuit A is normal or not. They are compared, and if they match, it is determined that circuit A is normal; if they do not fail, circuit A is determined to be abnormal; if circuit A is abnormal, the pulse counting operation is stopped.

[Problem to be solved by the invention]

Conventional pulse counting devices stop pulse counting when the main pulse counting circuit A is determined to be malfunctioning.
There was a problem in that the calculation of the pulse integrated value lacked reliability.

[Means to solve the problem]

In order to solve such problems, the present invention includes two pulse count input devices that output pulse count values and a control device that controls the pulse count input devices. When a failure occurs in one of the pulse count input devices, the pulse count value output from the other normal pulse count input device is input to calculate the count increment value and the pulse integrated value.

[Effect]

In the pulse counting device according to the present invention, if one pulse count input device fails, the pulse count value of the other pulse count input device is used.

[Embodiment] FIG. 1 is a system diagram showing an embodiment of a pulse counting device according to the present invention. In the figure, 1 is a main pulse count input device, 2 is a sub pulse count input device, IA, 2A.
is the main pulse counting circuit, IB2B is the slave pulse counting circuit, I
C and 2C are count comparison circuits, 3 is a control device, 3A and 3G are pulse count value storage means, 3B and 3D are count increment value calculation and storage means, 4 is a switching means, and 5 is a pulse integration means.

Main pulse counting circuit IA, 2A and slave pulse counting circuit IB,
2B and counting comparison circuits IC and 2C are circuits A and B in Fig. 3.
, C.

Next, the operation of the apparatus shown in FIG. 1 will be explained using the flowchart shown in FIG. Initially, the main pulse count input device 1 is used, and the control device 3 inputs the pulse count value. The input pulse count value is stored in the pulse count value storage means 3A. Next, the count increment value calculation storage means 3B calculates the count increment value Δb from the pulse count value (step 11).
, Δb are stored. Since the switching means 4 is now connected to the count increment value calculation and storage means 3B, the count increment value Δb is input to the pulse accumulation means 5, and the pulse accumulation value S is calculated.

After calculating the pulse integrated value S, it is determined whether or not there is a failure in the device 1 (step 12). If there is no failure, the process returns to step 11 and the calculation of the count increment value Δb is repeated. If device 1 is out of order, device 2 is used, and control device 3 inputs pulse count value C.

The input pulse count value C is stored in the pulse count value storage means 3C.
is stored in Next, the count increment value calculation and storage means 3D calculates a count increment value ΔC from the pulse count value C (step 13), and stores ΔC. Now, since the switching means 4 is connected to the count increment value calculation storage means 3D, the count increment value ΔC
is input to the pulse integration means 5, and the pulse integration value S is calculated.

After calculating the pulse integrated value S, it is determined whether or not there is a failure in the device 2 (step 12). If there is no failure, the process returns to step 11 and the calculation of the count increment value ΔC is repeated. If the device 2 is out of order, it is determined whether or not the device 1 is out of order (step 15); if the device 1 is not out of order, the process returns to step 11. If the device 1 is still faulty, the pulse counting operation is stopped.

In this way, even if the main pulse count input device 1 fails, the pulse counting operation can be continued by the slave pulse count input device, so a highly reliable pulse counting device can be realized.

The table initially uses the pulse count value of device 1, and the time t, !
The pulse integrated value is shown when the device 1 fails in .

The pulse count value input to the control device 3 is at time t7. ! The count value changes to C at . By changing the count value used in this way, the pulse integration operation does not stop, and neither excess nor deficiency occurs in the integrated value.

[Effects of the Invention] As explained above, the present invention includes two pulse count input devices that output pulse count values and a control device that controls the pulse count input devices. If a failure occurs in one of the input devices, the pulse count value output from the other normal pulse count input device is input and the count increment value and pulse integrated value are calculated. Even if the pulse counting device malfunctions, there is no need to stop the pulse counting operation, and no excess or deficiency will occur in the integrated value, so it is possible to realize a pulse counting device with high reliability.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of a pulse counting device according to the present invention, FIG. 2 is a flowchart for explaining the operation of the device shown in FIG. 1, and FIG. 3 is a system diagram showing a conventional pulse counting device. It is. l...Main pulse count input device, IA, 2A...
Main pulse counting circuit, IB, 2B... Slave pulse counting circuit, IC, 2C... Count comparison circuit, 2... Slave pulse count input device, 3... Control device, 3A, 3C...
Pulse count value storage means, 3B, 3D... Count increment value calculation storage means, 4... Switching means, 5... Pulse integration means.

Claims (1)

[Claims] In a pulse counting device that calculates a count increment value from a pulse count value obtained by counting the number of pulses from a pulse signal, and calculates a pulse integrated value by integrating this count increment value, two units that output the pulse count value. a pulse count input device and a control device for controlling the pulse count input device, and the control device is arranged such that when one of the pulse count input devices malfunctions, an output is output from the other normal pulse count input device. A pulse counting device that calculates a count increment value and a pulse integrated value by inputting a pulse count value.