JPS595762A - Loop transmission control system - Google Patents

Abstract

PURPOSE:To obtain a loop transmission control system whose reception sensitivity is adjustable in an installed state as it is, by setting up an adjustment mode program in the control software of each processor. CONSTITUTION:When the reception sensitivity is adjusted, all control stations 1-3 are placed in adjustment mode; for example, the control station 1 is placed in transmission mode and the control stations 2 and 3 are placed in reception mode. In this state, the processor MC of the control station 1 operates repeatedly in the order of steps (1), (2), (3), (4), (5), and (6) or (7) shown in a figure and the control stations 2 and 3 operate repeatedly in the order of the steps (1), (2), (4), (5), and (6) or (7). Then, an RV for sensitivity adjustment is adjusted firstly so that the reception adjustment is made in the order of the control stations 3 and 1. The manual adjusting method is described as above, but automatic sensitivity adjustment is available by the output of a coincidence detecting means.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loop transmission control system.

FIG. 1 shows a block diagram of a conventional loop transmission control system configured using a token passing method. As shown in Figure 1-b, the distributed control stations 1゜2.3 are connected in a loop by a transmission line 4, and only the station holding the token circulating within the loop has the right to transmit. can be obtained. The station that has obtained the right to transmit sends transmission data into the loop from the transmission terminal TX. Other stations receive data from receiving terminals ~.

FIG. 2 shows a concrete block diagram of each control station 1-3. In FIG. 2, the receiving section RA shapes the waveform of the signal input from the receiving terminal R and sends the signal RBK to the receiving device. The variable resistor RV is used to adjust the threshold level, since the signal input from the reception terminal RX has dropped in level due to the distance of the transmission IS4. P is the receiving section RA during the above adjustment.
This is a level indicator consisting of an LED, etc. that lights up when signal reproduction is performed correctly. The receiving device RB is
Reception data (serial data) input from reception terminal Rx
is converted into parallel data and supplied to processing device i (consisting of a CPU, etc.) MC. The transmitting device TB is the processing device M
Converts the parallel data sent from C into serial data. The transmitter TA sends transmission data from the transmission terminal TI to the transmission line 4. The switch SW is closed when the station is not a transmitting station, and the signal input from the receiving terminal RX is sent out from the transmitting terminal TX as it is (a level-regenerated signal). When transmitting, it is open and the signal is sent from the transmitting device TB. send out a signal.

In such a loop transmission control system, when trying to adjust the reception sensitivity of the reception section RA of each control station 1 to 3 with the installation state shown in Fig. 1, for example, when adjusting the reception section RA of control station 3, When attempting to do so, if you do not know which station is currently the transmitter (due to the token passing method), for example, if control station 1 is the transmitter and control station 2 is not adjusted, the reception terminal of control station 3 Since normal data was not sent to RX, adjustment could not be made just by changing the variable resistance Rv of control station 3. For this reason, conventionally, as shown in FIG.
and the fixed data transmission source 5 in the same state as the installation state (
length. The variable resistance Rv was being adjusted without a single cable 6tl (type of cable, etc.).

As described above, in the conventional example, since it is not possible to make adjustments in the installed state, when making adjustments, it is necessary to remove the transmission line 4 from the installed state, prepare the data transmission source 5 and the cable 6, and make adjustments. The drawback was that adjusting the receiving sensitivity was complicated.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a loop transmission control system that can easily adjust the reception sensitivity of a reception section while the system is installed.

The loop transmission control system of the first invention is a loop transmission control system in which a plurality of control stations are connected in a loop via a transmission line, and each of the plurality of control stations is connected as shown in FIG. , fixed data storage means for storing the same fixed data, fixed data output means for reading fixed data from the fixed data storage means and outputting it when in the reception sensitivity adjustment mode and in the transmission mode, and the fixed data a transmitter that serves as an output means and transmits the output fixed data to the transmission line; a receiver that shapes the waveform of the signal sent through the transmission line to obtain received data; A received data input means takes in the received data outputted from the receiving section, and a match between the received data taken into the received data input means and the fixed data read from the fixed data storage means is detected. - paper detection means; an indicator responsive to the paper detection means; adjustment means for adjusting the threshold level of the reception section; and an output end of the reception section and an input end of the transmission section in the reception mode. Equipped with a switch to connect.

Hereinafter, an embodiment of the first invention will be described based on FIGS. 5 and 6. This loop transmission control system prepares an adjustment mode unrelated to the original control operation in the control software of the processor MC of each control station 1 to 3, and sets all control stations 1 to 3 to adjustment mode. There are two adjustment modes: a transmission mode that only transmits, and a reception mode that only receives.One control station is set to transmission mode, and the other control station is set to reception mode. do.

Here, the adjustment mode of each control station 1 to 3 will be explained with reference to FIG. 6.

(1) Read the state of the mode switch and determine whether it is in adjustment mode.

(2) When the determination result in step (1) is YES, it is determined whether the call mode is selected.

The switch SW is opened and fixed data is transmitted from the transmission terminal TX via the transmitter TB and the transmitter TA.

(4) When the determination result in step (2) is NO or after the completion of step (3), the fixed data is received at the receiving terminal and taken in through the receiving unit RA and receiving device RB.

(5) Determine whether the data has been correctly obtained using the value of the adjusted variable resistor Rv. That is, the received data and the fixed data transmitted from the control station 1 [each control station 1 to
3 (stored in memory) match.

(6) When the determination result of step (5) is YES, 1. Turn on the level indicator Ph and step (
Return to 1).

(7) When the determination result of step (5) is NO,
Turn off the level indicator Ph and step (II)
Return to K.

(8) If the determination result in step (1) is NO, the original control routine is performed and the process returns to step (1).

Next, a method for adjusting reception sensitivity will be explained.

First, when adjusting the reception sensitivity, all control stations 1 to 3 are set to adjustment mode, for example, control station 1 is set to transmission mode, and control stations 2 and 3 are set to reception mode. As a result, the processing device MC of the control station l is (1)-(2)→(3)→(4
Repeat steps 1 → (5) → (6) or (7),
Processing device MC of control station 2.3 is (1) → (2) → (4)
→ (5) → (61 or (7) steps are repeated. While each of the control stations 1 to 3 is performing these operations, first, the reception sensitivity of the reception unit RA of the control station 2 is adjusted. Specifically, the variable resistor Rv is adjusted so that the level indicator Ph lights up.If the level indicator Ph lights up, the reception sensitivity adjustment is completed.

Next, adjust the receiving section RA of control station 3 in the same way as for control station 2, and finally adjust the receiving sensitivity of the receiving section RA of control station 1 in the same way as in the first generation, completing the adjustment operation for the entire system. do.

As a result of this configuration, the receiving section RA of each control station 1 to 3
You can easily adjust the reception sensitivity while the device is installed.

In the conventional example, the threshold level of the level indicator Ph is normal and the received data is "O" and "
If the threshold level is not normal and the received data is rOJ or
The level indicator Ph was configured to be turned off by hardware when the level indicator Ph was fixed at ``, but when an adjustment mode was prepared as in the embodiment, the level indicator Ph was turned on by software as shown in the flowchart of Fig. 6. This will increase the reliability of the adjustment.

A loop transmission control system according to a second aspect of the invention is a loop transmission control system in which a plurality of control stations are connected in a loop through transmission lines, and each of the plurality of control stations is connected as shown in FIG. , a fixed data storage means for storing the same fixed data, a fixed data output means for reading and outputting fixed data from the fixed data storage means in the reception sensitivity adjustment mode and the transmission mode, and the fixed data output means. a transmitting section that sends fixed data output from the Itl period transmission line to the Itl period transmission line, a receiving section that waveform-shapes the signal sent through the transmission line and obtains the received data, and a a received data input means for receiving received data outputted from the receiving section; and a coincidence detecting means for detecting a match between the received data taken into the received data input means and the fixed data read from the fixed data storage means. , an indicator responsive to this coincidence detection means, and lJ
a resistor for adjusting the threshold level of the recording/receiving section;
resistance value variable means for automatically sequentially changing the resistance value of the resistor; operation stop means for stopping the operation of the resistance value variable means in response to a coincidence output from the coincidence detection means; and a switch for connecting the output end of the iU record transmitter and the input end of the iU record transmitter.

Hereinafter, an embodiment of the second invention will be explained based on FIGS. 8 and 9. In this loop transmission control system, control stations 1' to 3'' having the configuration shown in FIG. 8 are connected in a loop through a transmission line 4. In place of Rv, a resistor group R'V consisting of a series circuit of resistors Rv0 to Rv, and switches swo-sw connected in parallel to each of the resistors RVO to R, and a switch group 5WRv of 7 are used for processing. By turning on and off the switches 5Wo-8W7 based on the on-off pattern output from the device MC via the output port P, the series resistance value of the resistor group R'v is changed from R8 to R6+8X
R. It is designed so that it can be changed by t. However, the resistance values of the resistors RVO"" RV7 are all set to the same value.

The switches 5Wo-SW7 are composed of analog switches, relays, or the like. DB is a data bus, and CL is a control line.

In this loop transmission control system, each control station 1'
An adjustment mode unrelated to the original control operation is prepared in the control software of the processing unit MC of ~3', and adjustment is performed by setting all control stations 1' to 3' to the adjustment mode. The adjustment mode includes a transmission mode in which only transmission is performed and a reception mode in which only reception is performed, and one control station is placed in transmission mode and the other control stations are placed in reception mode.

Here, each system? The adjustment mode for hits 1 to 3 will be explained with reference to FIG. 9.

(1) At startup, such as when the power is turned on, data corresponding to the on/off pattern of the switch group SwRv corresponding to the previously adjusted resistance value is read from the backup memory and output from the output port P, and the switches SWo to SW are turned on and off. Set according to the on/off pattern.

(Set 21i=0, initialize the on/off pattern of the resistor group R/V, and clear the adjusted flag.

(3) Read the state of the mode switch and determine whether it is in adjustment mode.

(4) When the determination result in step (3) is YES, turn on switches SW0 to S town, and
1+1 to SW8 are turned off, and the resistance value of the resistor group R is adjusted (corresponding to manual adjustment of the variable resistor Rv in FIG. 2).

(5) Determine whether it is in transmission mode.

(6) When the determination result in step (5) is YES, open the switch SW and transmit the transmitter TB and transmitter TA.
Fixed data is transmitted from the transmission terminal TX via the transmission terminal TX.

(7) When the determination result in step (5) is NO or at the end of step (6), fixed data is received from the reception terminal Rx and taken in through the reception unit RA and reception device RB.

(8) Determine from K whether the adjusted flag is standing or not.

(9) If the determination result in step (8) is NO, press the button and determine whether the data was correctly obtained using the adjusted value of the resistance group R'V.In other words, the received data and the control station 1'
It is determined whether or not the fixed data (stored in the memory of each control station I' to 3') sent from the control station matches the fixed data transmitted from the control station I' to I' to I3'.

(10) When the determination result in step (8) or step (9) is YES, S! is stored in the backup memory corresponding to the on/off pattern of switch group SWv! It's crowded.

(11) Set the ltMl completion flag.

(12) Turn on the level indicator Ph.

(13) %i when the judgment result of step (9) is No
Update i as =i+1.

(14) Turn off the level indicator Ph.

(15)! = 8, and the determination result is N
If O, return to step (3).

α6) When the determination result of step (15) is YES,
Set i=Q and return to step (3).

(17) When the determination result in step (3) is NO, perform the original control routine.

(Set tsti=o and clear the adjusted flag.

Next, a method for adjusting reception sensitivity will be explained.

First, when adjusting the reception sensitivity, all control stations 1" to 3
When the control station 1' is set to the adjustment mode KL, for example, the control station 1' is set to the transmission mode, and the control station 2' is set to the adjustment mode KL. Set 3' to receive mode. As a result, fixed data is transmitted from the control station 1', and the control stations 1' to 3' automatically adjust the receiving sensitivity of the receiving section RA based on the flowchart in FIG. By executing the operation shown in the flowchart of FIG. 9, the adjustment is completed and the level indicator Ph lights up. Correct fixed data will not be output from the transmission terminal T of the control station 2' until the control station 2' has been adjusted.
Even if the control station 11° is adjusted, the adjustment is not completed.

When the control station 2' has been adjusted, correct fixed data will be output from the control station 2', and the control station 3' will have completed the adjustment by executing the flow shown in FIG. Since the control station 3' has been adjusted, correct fixed data will be output from the control station 3', and the control station 1' will be
By executing the flow shown in the figure, the purchase will be completed.

As a result of this configuration, the receiving sensitivity adjustment of the receiving section RA of each control station 1' to 3' can be automatically performed in the installed state.

As described above, according to the present invention, it is possible to easily adjust the reception sensitivity of the reception section of each control station while it is installed.
The second invention further has the effect that the reception sensitivity adjustment can be performed automatically, making the adjustment even easier.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional loop transmission control system.
Fig. 2 is a concrete block diagram of the main part, Fig. 3 is a block diagram showing a conventional receiving sensitivity adjustment method, Fig. 4 is an explanatory diagram showing the configuration of the first invention, and Fig. 5 is a block diagram showing the conventional reception sensitivity adjustment method. FIG. 6 is a block diagram of an embodiment of the invention, FIG. 6 is an a-chart thereof, FIG. 7 is an explanatory diagram showing the configuration of the second invention, and FIG. The circuit diagram and FIG. 9 are its flowcharts. 1 to 3...Control station, 4 river transmission line, RA...Receiving section,
RB...receiving device, MC...processing device, TB river communication device, TA...transmission section, Rv river variable resistor, R'v...
・Resistance group, Rc' Rvo ” Rv'y ”'Resistance,
5WRv...Switch group, sw. SW7...switch, SW...switch-30! RV Figure 3 (Transmission 8) (Receiving station) (Communication station) Figure 5 Figure 4

Claims (2)

[Claims] (1) A loop transmission control system in which a plurality of control stations are connected in a loop via a transmission line, in which each of the plurality of control stations has a fixed data storage means for storing the same fixed data, and a receiver. fixed data output means for reading and outputting fixed data from the fixed data storage means when in the sensitivity adjustment mode and in the transmission mode; and a transmitting section for transmitting the fixed data output from the fixed data output means to the transmission line. and a receiving section that obtains received data by shaping the waveform of a signal sent through a transmission line; and a receiving data input means that receives received data output from the receiving section when in the receiving sensitivity adjustment mode; a coincidence detection means for detecting a coincidence between the received data taken into the received data input means and the fixed data read from the fixed data storage means; an indicator responsive to the coincidence detection means; A loop transmission control system comprising: an adjustment means for performing adjustment; and a switch that connects an output end of the reception section and an input end of the transmission section in a reception mode. (2) A loop transmission control system in which a plurality of control stations are connected in a loop via a transmission line, in which each of the plurality of control stations has fixed data storage means for storing the same fixed data, and a fixed data storage means for storing the same fixed data; Fixed data output means that reads and outputs fixed data from the fixed data storage means when in the sensitivity adjustment mode and the transmission mode, and sends the fixed data output from the fixed data output means to the old and previous transmission lines. a reception section that waveforms the signal sent through the transmission line to obtain reception data; and a reception data input that receives reception data output from the @ki reception section when in the reception sensitivity adjustment mode. a means for detecting a match between the received data taken into the received data input means and the fixed data read from the fixed data storage means; an indicator responsive to the means for detecting a match; A resistor for adjusting the threshold level, a resistance value variable means for automatically sequentially increasing or decreasing the resistance value of this resistor, and actuation of the resistance value variable means in response to a coincidence output from the i11 paper detection means. A loop transmission control system comprising: an operation stop means for stopping the 1TU8 transmitter; and a switch that connects the output end of the receiver and the input end of the 1TU8 transmitter in a receive mode.