JPH06243268A - Method and device for inputting bcd signal to standard integrated distributed instrumentation system - Google Patents

Abstract

PURPOSE:To prevent the degradation of recognition resolution by providing a standard small-sized sequencer between a BCD output device and a standard integrated distributed instrumentation system (DCS) and generating an input signal which secures the readable state at the read tinting of the DCS. CONSTITUTION:When the BCD signal whose value is changed at a high speed off the angle of a rotating material or the like is inputted to the DCS, a standard small-sized sequencer 20 is provided between a BCD output device 10 and the DCS 12. The sequencer 20 is provided with two BCD output parts 22-A and 22-B and takes an input BCD value as the input as it is. If its position value is changed at a maximum change speed of a source signal or higher in comparison with the value for preceding scan, it is rejected as abnormal. The value regarded as normal (OK) is outputted to one of output ends 22-A and 22-B, and a signal normality (OK) signal corresponding to this output end is turned on, and that corresponding to the other output end is turned off. Thus, the degradation of recognition resolution due to read error or time lag is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a method and an apparatus for digitally processing a D signal and inputting the standard integrated dispersion instrumentation system to the standard integrated dispersion instrumentation system without error without modifying the standard integrated dispersion instrumentation system.

[0002]

2. Description of the Related Art When a BCD signal whose value changes at high speed is read by a standard integrated dispersion instrumentation system (hereinafter abbreviated as DCS), conventionally, a read permission signal is output from the DCS to a BCD output device and then the BCD output device. Side freezes the output and returns the read OK signal to the DCS, the DCS receives the read OK signal and then reads the BCD signal, or the handshake method shown in FIG.
The D output device 10 outputs a read disable signal (busy signal) 14 to the DCS 12 for a certain period of time including the timing of changing the output value, and the DCS 12 determines that the value of the BCD signal 16 is indefinite when the busy signal 14 is in the ON state. There is a method such as not reading.

[0003]

However, in the handshake method, the execution cycle of the DCS software (several tens to several hundreds of msec) is required for two to three times, and the data update and the processing process for each software execution cycle are not necessary. There is a problem that it is possible.

In another method using the busy signal, since the BCD output device 10 and the DCS 12 perform processing asynchronously with each other, the probability that the BCD output device 10 is in the unreadable state when the DCS 12 wants to read. However, there is a problem that the higher the change in the BCD signal 16, the higher the change.

Furthermore, it is necessary to generate a busy signal 14 which is longer than the time constant (several msec) of the digital input card (DI card) 18 of the DCS 12 of FIG. 1, and when the change of BCD data is in the same order, it cannot be read (busy). ), There is a problem that there is no chance of reading.

The present invention has been made in order to solve the above-mentioned conventional problems. When the BCD signal whose value changes at high speed is input to the standard DCS, the DCS hardware and software are not changed at all. Input method to ensure the readable state at the DCS reading timing and prevent deterioration of recognition resolution due to reading error or time delay, and input method of high-speed change type BCD signal to standard integrated dispersion instrumentation system And to provide a device.

[0007]

SUMMARY OF THE INVENTION The present invention is a method for inputting a BCD signal whose value changes at a high speed to a standard integrated distributed instrumentation system.
By receiving the CD signal and performing the change point check / rejection, the output of any one of the plurality of BCD output sections must be a value that the standard integrated distributed instrumentation system can read immediately. The above-mentioned object was achieved by producing an input signal that always makes the read timing of the standard integrated distributed instrumentation system readable without changing the hardware and software of the standard integrated distributed instrumentation system. It is a thing.

Further, in the input device of the BCD signal whose value changes at a high speed to the standard integrated dispersion instrumentation system, a standard small sequencer for receiving and changing one point of the BCD signal, and a plurality of standard small sequencers are provided. At least one output of the output unit is a plurality of BCDs that hold a value that can be read immediately by the standard integrated distributed instrumentation system.
By providing the output section, an input signal that always makes the reading timing of the standard integrated distributed instrumentation system readable without changing the hardware and software of the standard integrated distributed instrumentation system is created. Then, the above-mentioned object is achieved.

[0009]

According to the present invention, the BCD output device and the DCS can be used when the standard DCS is used to read a BCD signal that changes at high speed.
Between them, a standard small sequencer is inserted to prepare at least two BCD output sections. Input B to the small sequencer
The CD value is input as it is, the change point is checked and rejected, the value that has become OK is output to one of the two output terminals, the OK signal corresponding to this output terminal is turned on, and the other output terminal is supported. By turning off the OK signal, DC
It is possible to guarantee a readable state at the S reading timing and prevent the recognition resolution from deteriorating due to a reading error and a time delay.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In this embodiment, as shown in FIG. 2, between the BCD output device 10 and the DCS 12 of the conventional example shown in FIG.
Small sequencer 20 provided as a standard by the electric / instrumentation manufacturer
Is included.

The sequencer 20 receives the BCD signal 16 of the BCD output device 10 and does not use the busy signal 14. Further, the sequencer 20 has two BCD output sections 22-
Has A, 22-B. It is possible to make a specially designed signal processing device here, but it is more preferable to use a standard product because of cost and maintainability.

The input BCD value is directly input to the sequencer 20. At this time, the scan cycle is, for example, 10 msec.
Below. Next, this input value is compared with the value at the previous scan, and if there is a change at the maximum change speed of the source signal or more, it is rejected as an abnormality.

The value that is OK here is output to one of the two prepared output terminals 22-A and 22-B, and the "signal normal" signal (OK signal) corresponding to this output terminal is turned on. The OK signal for the other output end is turned off.

One of these two output terminals is alternately used for each output, and the above operation is repeated.

FIG. 3 shows an example of the output waveform of the BCD output device in the case where the minimum digit (0.1 °) changes from 8 ← → 7. Table 1 below shows the effects of the device according to the present invention.

[0017]

[Table 1]

As shown in Table 1, in the conventional system of FIG.
13/32 = About 40% of abnormal reading of DCS is recognized. On the other hand, in the embodiment according to the present invention,
The abnormality is 0. Also in this embodiment, the input to the sequencer is 280/600 = about 47% of abnormal input,
The output signal for DCS after rejecting this is
It is updated every 15msec.

The apparatus of the present invention mainly uses the soft logic of a small-sized sequencer, and allows fine timing adjustment for each signal to be freely performed, and the high-speed software execution cycle (1
Since data can be updated within 0 msec), a sufficient update period is guaranteed for DCS usage conditions (software execution period, usually 200 msec), and bit errors within 1 digit and 2 digits or more of the BCD signal are prevented. It becomes possible to supply a BCD signal for DCS.

[0020]

As described above, according to the present invention, D
Since the hardware and software of the CS system are not restricted, and the BCD output device remains the standard specification without any special modification, the device of the present invention itself uses the standard small sequencer as the basic system. Both cost and maintenance are advantageous, and the update cycle (normally 10 msec) is sufficiently smaller than the soatware execution cycle of DCS.
/ 200 msec = 1/20 or less), there is an effect that a correct BCD signal can be supplied.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a conventional system for outputting a busy signal from a BCD output device.

FIG. 2 is a block diagram showing an outline of an embodiment of the present invention.

FIG. 3 is a diagram showing an example of an output waveform of a BCD output device.

[Explanation of symbols]

 10 ... BCD output device 12 ... Total dispersion instrumentation system (DCS) 14 ... Busy signal 16 ... BCD signal 18 ... DI card 20 ... Small sequencer 22-A, 22-B ... BCD output unit

Claims (2)

[Claims] 1. A method for inputting a BCD signal whose value changes at high speed to a standard integrated distributed instrumentation system, wherein a standard small sequencer receives one type of BCD signal,
In addition to checking / rejecting change points, the output of any one of the multiple types of BCD output section must be a value that can be read immediately by the standard integrated dispersion instrumentation system. Standard integrated dispersion instrumentation of BCD signal, characterized in that it produces an input signal that makes the read timing of the standard integrated dispersion instrumentation system always readable without changing the hardware and software of the instrumentation system. Input method to the system. 2. An input device of a BCD signal whose value changes at high speed to a standard integrated distributed instrumentation system, which receives one type of BCD signal and performs a change point check / rejection and a standard small sequencer. The output of any one of the output units is equipped with a plurality of BCD output units that hold a value that can be read immediately by the standard integrated dispersion instrumentation system. A standard integrated dispersion instrumentation system for BCD signals, characterized by producing an input signal that makes the read timing of the standard integrated dispersion instrumentation system readable without any change in hardware and software. Input device.