JPS63254842A - Multiplex data link - Google Patents

Abstract

PURPOSE:To attain rational and efficient operation between a central processing unit and lots of sensors by connecting peripheral processing units in series in a ring via a central processing unit. CONSTITUTION:A LAN controller 40 being a central processing unit is provided to the machine controller 10 and LAN controllers 51-5n as peripheral processing units relaying and processing each sensor output corresponding to plural sensors 21-2n are provided, and the controllers 40, 51-5n are connected in series in a ring. The controller 40 sends a signal having a start code only to the controller 5 being in the nearest position electrically. Thus, the data corresponding to all sensor outputs connected are multiplexed in time series and collected automatically in the lump.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a central processing unit in a controller for controlling the sensor outputs of various sensors used in various industrial machines, NCtF1 machines, automatic guided vehicles, robots, etc. The present invention relates to a multiplex data link suitable for centralized monitoring, and particularly to a method of connecting each signal line and implementation of a signal protocol for rational monitoring.

[Prior Art] FIG. 5 shows an example of a signal exchange method conventionally employed for such a centralized monitor &ffff of sensor outputs.

In FIG. 5, 10 is a machine controller that centrally controls the target machine as the control controller, 21 to 2n are the above-mentioned sensors arranged in each part of the separate machine, and KL is a machine controller for these machine controllers. 10 and the signal lines disposed between the sensors 21 to 2n, respectively.

That is, in the method a5 shown in FIG. 5, signal lines for transmitting and receiving signals are arranged between the machine controller 10 and each of the sensors 21 to 2n, and when the sensor output of the sensor 21 is desired, for example, A data output request signal is sent from the machine controller 10 to the sensor 21 through the corresponding signal line (a signal used for synchronizing one machine controller and a large number of sensors in such multiple communication), Each sensor sends its own data to the machine controller only after this request signal is applied, and furthermore, data from the sensor 21 is received by the machine controller 10 through the corresponding signal line, and the data is sent to the machine controller 10. I'm trying to monitor it. The same applies even when the sensor outputs of the other sensors 22 to 20 are desired.

FIG. 6 also shows another example of a signal exchange method conventionally employed in such a sensor output centralized monitoring device.

That is, in the method shown in FIG. 6, there are m sensors (m
<n) LAN (Local Area Network)
Controllers 31 to 3m are arranged, and each of these LAN controllers 31 to 3m relays and processes several sensor outputs. Even in this case, the basic manner of transmitting and receiving the sensor output is the same as the example shown in FIG. 5 above.

[Problems that Ming attempts to solve with g] For example, in the method shown in FIG. Therefore, the machine controller, which centralizes the sensor outputs of these many sensors, has a large number of signal lines.

For this reason, it is not only difficult to connect the machine controller and each sensor, but also causes incorrect wiring.Furthermore, the bundle of signal lines becomes bulky and extremely heavy. 17, making it extremely inconvenient to handle.

In addition, although the method shown in FIG. 6 can reduce the number of signal lines I51 connected to the machine controller mentioned above and shorten the overall wiring length, the overall signal line wiring The number itself will not fundamentally decrease.

Therefore, even when using the method shown in FIG. 6, the above essential problem cannot be solved.

This invention aims to provide a multiplex data link that improves the connection and signal exchange between a machine controller (central processing unit) and a large number of sensors, and provides a rational and efficient operation thereof. It is something.

[Means for Solving the Problem] The present invention includes means for generating data indicating the content based on the sensor output of each corresponding sensor, corresponding to each of the plurality of sensors, and a means for generating data indicating the content based on the sensor output of each corresponding sensor. Input signal with at least a start code indicating the beginning of data
Accordingly, means for detecting and extracting the start code of the human power signal, adding the generated data to the extracted start code, and further adding the input signal to the signal to which this data is added. A peripheral processing device is provided which includes a means for adding and outputting a portion other than the start code, and these peripheral processing devices are connected in series in a ring through the central processing unit.

[Effect 1] As a result, the connection between the central processing unit and each sensor (more precisely, each peripheral processing unit) is
It can be approximated only by water signal lines (substantially 81 lines due to the above-mentioned annular connection).

Moreover, since the central processing unit takes in the sensor outputs of the respective sensors, it is no longer necessary to issue a data output request signal to each sensor each time as described above. That is, in the central processing unit, a signal containing at least the above start code is sent only to the peripheral processing unit electrically closest to the central processing unit at 7ff through the series connection. Each surrounding area including 3I [! Based on the above-described operation of the device, data corresponding to the sensor outputs of all the connected sensors are multiplexed in time series and automatically collected all at once.

Note that the signal line disposed as the input line or output line is not limited to the electric cable as assumed above, but may of course be an optical cable.

[Embodiment] FIGS. 1 to 4 show an embodiment of a multiplex data link according to the present invention.

FIG. 1 shows the entire development of the data link of this embodiment.

As shown in FIG. 1, in this embodiment, the machine controller 10 described above has a LAN as the central processing unit.
In addition to providing a controller 40, a plurality of sensors 21
LAN controllers 51 to 5n are provided as peripheral processing devices for relay processing the sensor outputs, and these LAN controller i-rollers 40 and the LAN controllers 51 to 5n are connected in series in a ring shape.

In this embodiment, the sensors 21 to 2n are limit switches, proximity switches, push button switches, pressure switches, bimetal switches, etc., and output a 1-bit signal as a logical value "i'i" or approximately "0". A so-called on-off sensor is assumed.

FIG. 2 shows a specific example of the construction of the LAN controllers 51 to 5n as the peripheral processing devices. In addition, these LA
All N controllers 51 to 5n have the same configuration.

As shown in FIG. 2, these LAN controllers 51 to 5n each have a receiving circuit 501 that receives signal No. 8 and demodulates it as required. , a start code detection circuit 502 detects a start code indicating the beginning of sensor data using a predetermined logic J14M structure from this received and demodulated signal, and an error check code (searches for the presence or absence of an error) in the received and demodulated signal. 1 radio check circuit 503 that checks whether or not an error has occurred between the previous stage and its own stage based on a code generated and outputted from the previous stage LAN controller through an error check code generation circuit 507 (described later); A first switch circuit SW1 that controls the opening/closing of input of a signal to this error check circuit 503, and a shift circuit 504 that delays the signal as required in order to insert and add sensor data generated at the own stage to the received demodulated signal. , a data generation circuit 505 that generates and outputs sensor data to be transferred from the own stage based on the sensor output of each corresponding sensor; A second switch circuit SW2 that selectively outputs any of the sensor data generated and output by the data generation circuit 505 over time, and a stop that indicates the end of the sensor data with a predetermined logical structure from the selectively output signal. A stop code detection circuit 506 detects the code, an error check code generation circuit 507 generates and outputs a new search code based on the selected signal, and the second switch circuit SW2 generates a selected output signal. Fourth switch circuit SW4 that controls opening/closing of input to the error check code generation circuit 507
and a third switch that selectively outputs either the @ signal selectively output by the second switch circuit SW2 and the signal (error check code) generated and output from the error check code generation circuit 507 over time. The third switching circuit SW3 is configured to include a circuit SW3 and a transmitting circuit 508 that modulates the signal selectively output from the third switch circuit SW3 as required and sends it to the next stage AN controller or the central LAN controller 40.

Here, the receiving circuit 501 includes an impedance matching circuit, a receiving circuit, etc., when the signal transmission and reception between each LAN controller I and the roller is performed by an electric communication system via a metal cable (twisted pair cable, coaxial cable, etc.). The configuration includes an amplifier, a demodulation circuit, etc., and if the same signal exchange is performed by optical communication via an optical fiber, an optical-to-electrical converter and a demodulation circuit (Manchester demodulation circuit or CMI demodulation circuit, etc.) are required. It has a rough composition.

On the other hand, the transmission hU circuit 508 also includes a modulation circuit and a driver circuit when the signal transmission and reception between the LAN controllers is carried out by the above-mentioned telecommunication, and when it is carried out by the above-mentioned optical communication. , the configuration includes a modulation circuit and an electro-optic converter.

The error check circuit 503 is a well-known circuit that performs the error check using a CRC check method, a vertical/horizontal parity check method, or the like.

Further, in this embodiment, a start code detected by the start code detection circuit 502, a stop code detected by the stop code detection circuit 506,
and the sensor output of each corresponding sensor (1" or "0"
”), the sensor data generated by the data generation circuit 505 is determined as shown in Tables 1 and 2 below, and no matter how the sensor data is organized,
This sensor data string and the start code or stop code can be accurately identified.

Table 1, Table 2, and FIG. 3 are timing charts showing an example of the operation of the LAN controller 52 among the LAN controllers 51 to 50. Hereinafter, referring to FIG. The signal processing operation executed by the controller will be explained in detail.

Now, the front stage LAN controller (LAN controller 5
1) to the local LAN controller (LAN controller 52) in the manner shown in FIG. Figure 3 fc)
The start code of this received signal is detected at the timing shown in FIG. ), and the fourth switch circuit SW4 is closed (initial state t) (FIG. 3 F(1), (
h) and (j)).

As a result, the error check circuit 503 starts error check operation for the input signal, and the error check code generation circuit 507 also starts generating a new error check code based on the input signal. do.

In addition, in response to the selection change of the second switch SW2, the sensor data of the corresponding sensor (sensor 22) generated by the data generation circuit 505 is output from the second switch SW2 following the detected start code. (Data D2) is selectively output. Also, at this point, the third
Since the switch circuit SW3 maintains the terminal 1 manually selected state, the selection signal applied to the second switch circuit SW2 is sent as is (transferred and outputted through the H circuit 508 (see FIG. 3 fk)).

When the data generation circuit 505 completes outputting the data (data D2) that it has generated, it issues a data addition completion signal to the second switch SW2 (the third switch SW2).
(see Figures (2) and (d)), and the second switch SW2 is brought into the terminal 2 manual selection state (see Figure 3 (h)).

As a result, the second switch SW2 outputs the added data (data D2>) as shown in FIG.
), the shift circuit 504 selectively outputs the received signal processed by the amount of data, that is, in this example, the signal after data D1 of the same received signal. This signal is also transferred and output as is to the next stage via the third switch circuit SW3 and the transmission circuit 508 (see FIG. 3(k)).

The stop code of the thus transmitted signal is then detected at the timing shown in FIG. 3(e).

In the stop code detection circuit 506, when a stop code is detected in this way, the first switch circuit SW1 and the fourth switch circuit SW4 are opened in the initial state, and the third switch circuit SW3 is set to the terminal 2 manual selection state (initially, the terminal 1 manual selection state). (see FIG. 3(g), (i), and (j)).

In response to the switching of the third switch circuit SW3, the third switch SW3 outputs the error check code generation circuit 50 following the light detected stop code.
At step 7, the newly generated error check code 2 is selectively output and transferred through the transmitting circuit 508 (see FIG. 3(k)).

After this, in the error check code generation circuit 507,
When the output of the self-generated error check code is completed, it issues an error check code transmission completion signal to the second switch circuit SW2 and the FF13 switch circuit SW3 (see FIG. 3(k)U and (f)), These second and third switch circuits SW2 and SW3 are respectively set to the initial terminal 1 manual selection state (Fig. 3(b)
) and (i)).

Figure 4 shows the signal S transmitted between each LAN controller.
o, 81.82.・This shows the protocol of Sn (see Figure 1), and it shows the protocol of LAN controller 51~
By repeatedly performing the above-described operations in each of the LAN controllers 51 and 5n, these LAN controllers 51 and 52 respond to the sending of the signal So having the form shown in FIG. 4(a) from the central LAN controller 40. ．． ...
5n, the respective signals s1, 32 .
...Sn will be transmitted.

Then, only the output signal 3n from the last n-th LAN controller 5n is taken into the medium-heat LAN controller 40. The signal Sn taken into this LAN controller 40 is, as shown in FIG.
[) n is included in chronological order.

In the machine controller 10 (Fig. 1), the LA
Based on the sensor data of the respective sensors 21 to 2n which have been taken into the N controller 40 and appropriately identified, machine control is performed in an integrated manner as needed.

In addition, in the above embodiment, the logical structure of the start code and stop code added to the front stage of the sensor data was defined as shown in Table 1 above, but this is only an example, and the point is that the above sensor data It is only necessary to have a structure that can be distinguished from that, that is, an @ structure with two or more consecutive logical "1"s.

Furthermore, the logical structure of the sensor data is arbitrary, and the start code and stop code defined as described above may have a structure in which two or more consecutive logical 11111. The structure shown in Table 3 or Table 4 may also be used.

Table 3 Table 4 [Effects of the invention] As explained above, according to this invention, ■ Very 1
! ! A rational and highly efficient sensor monitor is realized with a simple signal line wiring structure.

■ For this reason, even for machines with a large number of sensors, the space required for arrangement and glands can be reduced, and even ff.
It is also possible to downsize the JIIA itself.

■ Each LAN controller as a peripheral processing device does not require any addresses, so they can all be shared, and
A production effect can also be expected.

■ For the same reason as above ■, adding, deleting, or
In addition, even when replacing the system, there is no need to worry about the signal transmission system, and it becomes easy to modify a separate machine.

You can obtain many excellent effects such as.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the essentials of the configuration of an embodiment of the multiplex data link according to the present invention, and FIG. 2 shows each LAN controller constituting the peripheral processing device in the embodiment shown in FIG. Fig. 3 is a block diagram showing an example of the formation of the roller (concrete roller), Fig. 3 is a timing diagram showing an example of the operation of the L A N controller, and Fig. 4 is a block diagram showing an example of the operation of the L A N controller.
FIGS. 5 and 6 are block diagrams each showing an example of a method of centrally monitoring a plurality of sensors that has been employed in the past. 10...Machine controller, 21-2n...Sensor, 40.51-5n・LAN-+controller, 50
1... Receiving circuit, 502... Star 1-code detection circuit, 503... Error checking circuit, 504...
shift 1-circuit, 505... data generation circuit, 506...
...Stop code detection circuit, 507...Error check code generation circuit, 508...Transmission circuit, SW1~
SW4...Switzerland circuit. Figure 1 Figure 5 Figure 6

Claims (1)

[Claims] When transmitting the sensor outputs of a plurality of sensors to one central processing unit and centrally monitoring the same, a method is provided for each of the plurality of sensors based on the sensor output of each corresponding sensor. means for generating data indicating this content; upon input of a signal including at least a start code indicating the beginning of the generated data, detecting and extracting the start code of the input signal; A peripheral comprising means for adding generated data to the extracted start code, and means for further adding a portion of the input signal excluding the start code to the signal to which this data has been added and outputting the resultant. A multiplex data link including a processing unit and connecting these peripheral processing units in series in a ring via the central processing unit.