JPS603243A - Transmitter-receiver - Google Patents

Abstract

PURPOSE:To prevent the entire system from being disabled of transmission/ reception by providing a check circuit checking a data signal outputted from the own unit and interrupting the own output line when the signal is in error, to each transmission/reception unit. CONSTITUTION:When a positive DC signal or a negative signal is outputted continuously to an output line 31 of the reception unit 30a, this signal is fed to a check circuit 29. The check circuit 29 detects that this signal is not a pulse signal and discriminates it as fault. Then the check circuit 29 turns off a switch 30. Then a relay 20 is deenergized and restored to turn off a normally open contact 20a and the output line 31 is interrupted from a transmission line La.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transmitting/receiving device in which a plurality of transmitting/receiving units having transmitting/receiving functions and other functions are connected to the same transmission path.

[Purpose of the invention]

The present invention provides a transmitting/receiving device that disconnects the output line of the transmitting/receiving unit when the data signal output from the transmitting/receiving unit is abnormal, thereby preventing the entire system from becoming unable to transmit/receive. The purpose is to write.

[Summary of the invention]

The present invention includes a command unit 1 to sequentially transmit counter pulses to a transmission line at predetermined time intervals, and a plurality of transmitting/receiving units connected to the transmission line. Callan 1 in which the count value of the counter pulse is assigned in advance to the transmitting/receiving unit.
When the transmitter/receiver unit determines that the value matches the value, a pulse-like data signal is selected between the determined transmitter/receiver units or between the determined transmitter/receiver unit and the command unit via the surface transmission path. A check circuit is installed in the J3 to check the data signal outputted from each transmitter/receiver unit, and to cut off the output line in case of an abnormality. It is characterized by what it did.

〔Example〕

An embodiment of the double-lowered tree invention will be described with reference to the drawings.

Figure 1 shows the configuration of the entire system, where 1 is for the command unit 1, 2o, 21,...2n are (n+1)
units [to groups, each 1 unit group 2
o, 21. . . . 211 is a set of a plurality of transmitting/receiving units, for example, two transmitting/receiving units 3o a and 3o b, 3xa, 3
1b, ... 3na, 3nl), and a command unit 1 and a transmitting/receiving unit 3a.
.

3o 11 , 31 a , 3t b , -'3n
a, 3nbG, t Connected to a pair (D transmission lines La, Ll).

First, the command unit 1 will be described according to FIG. 4 is a high frequency oscillation circuit that generates a rectangular pulse;
The oscillation pulse 1]1 which is the oscillation output is applied to the input terminal of the counter pulse generation circuit 5. This counter pulse generation circuit 5 has an oscillation pulse Pl
is divided appropriately, and the negative (
-) generates a square wave reset pulse P20 (1-), and thereafter, at predetermined time intervals, positive (+) square wave counting pulses P21, P22 as counter pulses are generated.
.

. . . P211 is generated sequentially. Then, a reset pulse P20 and one counting pulse 2x, P are output from the output terminal of this counter pulse generation circuit 5.
zz and -P2n are transmitted to the transmission lines 1a and 1b and are also applied to the input terminal of the counter 6. This counter 6 is reset to 10'' at each rising edge when the reset pulse P20 is applied, and after that, the counter 6 is reset to 10'' at each rising edge when the reset pulse P20 is applied. When P22, . . . P2n is given, it is triggered to 1 at the falling edge and rlJ, r2J, . . .
It is designed to perform a counting operation like rIJ. Reference numeral 7 denotes a check circuit, which receives a count signal S6 indicating the count value of the counter 6 and the following channels 1. It is possible to check which transmitter/receiver unit in which unit group has failed by applying the check pulse. Furthermore, this directive 1
The transmission line Lb is connected to the terminal 1 and 1 to 55 and is grounded.

Now, according to FIG. 3, unit group 2o.

21, ・2+1 (7) Transmission/reception unit 3o a
, 3ob.

32a, 3sb, -3na, and 3nb, these have the same configuration, so below, C will be described to represent the G and j configurations of the transmitting/receiving unit 3oa. That is,
8 and 9 are input/output terminals, one input/output terminal 8 is connected to the transmission line La, and the other input/output terminal 9 is connected to the transmission line 1.
'b and is grounded. Historically, the input/output terminal 8 is branched into two via a resistor 10, and the first and second branch ends are connected to diodes 11 and 1 of the polarity shown.
The light emitting diodes 14a and 1 of the illustrated polarity of the photocouplers 14 and 15 constituting the receiving circuit 13 through
5a, and are grounded to -C. Then, photocouplers 14 and 15's photo-transistor 14. The collectors of b and 15b are connected to the input terminals a and l'b of the control circuit 16, respectively, and are also connected to the positive (+) power supply terminal 19 via resistors 17 and 18, respectively. , each emitter is grounded. Further, the input/output terminal 8 is connected to a common connection point between the emitters of an NPN transistor 22 and a PNP transistor 23 that constitute the transmitting circuit 21 via a normally open contact 20a of a relay 20, which will be described later. The common connection point of each emitter is branched into two via a resistor 24, and the first and second branch ends are connected to diodes 25 and 2 of the polarity shown.
6 to the anode of the light emitting diode 14a and the cathode of the light emitting diode 15a, respectively.

The bases of the transistors 1 to 22 and 23 are connected in common, and the common connection point is connected to the output terminal Oa of the control circuit 16.
The collector of the transistor 23 is connected to the positive power supply terminal 19, and the collector of the transistor 23 is connected to the negative (-) power supply terminal 27. Furthermore, the control circuit 1
Reference numeral 6 performs a control operation as will be described later, and selectively applies operation signals to a plurality of loads (not shown) from the input/output terminal I10 via the turnout circuit 28 to prevent them from operating. Data signals are received from the plurality of loads via the input/output circuit 28 to perform predetermined control. Reference numeral 29 denotes a check circuit, which receives an information signal from the control circuit 16 to check whether it is normal or abnormal, as will be described later.When it judges that it is normal, it turns on the switch 30, and when it judges that it is abnormal, it turns on the switch 30. 3
0 is written as A. This switch 30 is connected between the positive power terminal 27 and the negative power terminal 27 via the relay 20 in series.

Next, the operation of this embodiment will be explained with reference to FIG. 4 as well.

For example, when the power is turned on, the counter pulse generation circuit 5 of the command unit 1 begins to generate a negative reset pulse P20 as shown in FIG. The counter 6 is 1
0”. Also, this reset pulse P20
is transmitted through the transmission lines 1a and lb to the transmitter/receiver unit 3o a,
3o b, 3t a, 31b,...3na
, 3nb, for example, the reset pulse P20 is applied to the input/output terminals 8, 9 of the transmitter/receiver unit 3Oa.
During this period, the light emitting diode 15a of the photocoupler 15 emits light and the phototransistor 15b turns on, so that the input terminal 1b of the control circuit 16 receives the hit pulse P20. is given, and the counter in the control circuit 16 is reset to rOJ. Similarly, other transmitting/receiving units l-3ob, 31a, 31
Each counter of b, -・t3na, 3nb is also 10
” is reset. In this case, unit group 2o
', 2z, -...2n have rOJ, rlJ,
1111111-n'' count values are assigned to each unit group 20 + 21 +...
・2[1 transmitting/receiving units 3aa, 3ob, 3xa, 3
1b, ...3na.

When the counter value of the 3nb counter reaches the count value assigned to its own group, each transmission/reception is 1 day h.
3o a, , between Gob, 318, 31 b.

... 3 na, 3 nl + between a5 and transmit/receive operations are allowed. Therefore, as described above, the reset pulse P20 is used to transmit and receive]nit 3 o
a *3o b, 3! 'a, 3s b,...3
When na, 311b is reset to "0", the transmission/reception 1.1J days 1 to 3oa to which the counter value "0" is assigned
, 3o and b, and the control circuit 1G of the transmitting/receiving unit 3oa starts to alternately output a high level signal and a low level signal from the output terminal Qa after a certain period of time has elapsed, and the high level signal At times, N I) N-type transistors 1 to 22 turn on and output a positive pulse to the output line 31, and when the level is low, the l) N P type transistor 23 turns on and outputs a negative pulse to the output line 31. Therefore, the output line 31 has a certain time space 5l) as shown in FIG.
Data signals Dr, C2, C3 and C4 consisting of repetitions of positive pulses and negative pulses are output at intervals a. If the transmitter/receiver unit 3Oa is normal, the check circuit 29 or switch 30 is turned on, so the relay 20
is energized and operates to turn on the normally open contact 20a, and the data signals Dr l' l)2.1)3 and C4 are transmitted to the transmission lines 1a and lb via the normally open contact 20a. become. Moreover, this data signal D1. D2.

C3 and C4 are resistor 24 and diode 25 or 2
J, which is also given to the receiving circuit 13 via 6,
When the data signals D1 and C3 are positive pulses, the light emitting diode 14a emits light and the phototransistor 14b
data signals D2 and C4 consisting of negative pulses.
At this time, the light emitting diode 15a emits light and turns on the phototransistor 15b, so that the data signals DI, C2, C3 and C4 are also applied to the input terminals 1a and lb of the control circuit 16. Become.

Further, the control circuit 16 supplies the data signals Dt, C2, C3, and C4 supplied to the input terminals Ia and Jb to the check circuit 29, and the check circuit 29 receives the data signals Dr, D2.

1] Since 3 and 04 are pulse signals, it is determined that they are normal, and the switch 30 is held in the A state, and the operation of the relay 20 is continued and skipped. In addition, the control circuit 16 outputs the output KA.
31 outputs the data signal D4, and output terminal Q is connected to 1 and 2.
A is made to output a high level signal to the output line 31, and after the rise of the data signal D4, a positive check pulse CHa is output and transmitted to the transmission lines 1a and lb, and this check is performed. Command pulse CHa 1 nit 1
The check circuit 7 receives the signal, and the check circuit 7 determines 2-1-2 groups from the contents of the counter 6, and since the i-x check pulse CI-18 is positive, the transmitting/receiving unit 3oa is Then, based on the presence of check pulse CI-18, it is determined that the transmitting/receiving unit 3a is normal.

If the check circuit 7 does not receive this check pulse CHa, the check circuit 7 determines that the transmitting/receiving unit 1-308 is not producing 03 normally due to a failure such as a disconnection, Appropriate actions will be taken. Then, as mentioned above, j! A receiving unit 3oa receives data signal D1. D2, I)3 and D4 are connected to transmission lines La, L
When a transmission is made to J-b, at this time, the transmitting/receiving unit 3゜b is capable of transmitting and receiving, so a receiving circuit similar to the receiving circuit 13 in this transmitting/receiving unit 3゜b receives the data signal II) 1゜D2, DB and D4, and thereby a control circuit similar to the control circuit 16 operates all the loads, for example, four, in the transmitting/receiving unit 3ab.In this case, it is necessary to operate all the loads in the transmitting/receiving unit 30b. When there is no transmitter/receiver unit 3゜a smell-C data signal 01.D2
, DB, and D4, which correspond to the load that needs to be operated, may be outputted to the control circuit 16 at -b. On the other hand, the transmitting/receiving unit 3°b receives the check pulse CHa from the transmitting/receiving unit 3oa.
After the disappearance of the space SPb for a certain period of time as shown in FIG.
, and then alternate negative pulses and positive pulses to output the J data signals D6, Ds, Dr, and DB to the transmission line 1a,
lb, and at this time, as described above, the transmitter/receiver unit 3. Since the transmitting/receiving unit 3oa is capable of transmitting and receiving, the receiving circuit 133 of the transmitting/receiving unit 3oa receives the data signal D5. Da, D? and DB, thereby causing the control circuit 16 to operate all the loads, for example, four, in the transmitting/receiving unit 3oa. In this case, when it is not necessary to operate all the loads of -b, transmitting/receiving unit 3ua, transmitting/receiving unit 3ob
Smell - (It is only necessary to output the data signal corresponding to the load that requires operation among the data signals Ds, Ds, Dr, and DB.Furthermore, the transmitter/receiver unit 1"3oLl
A check pulse CHb of negative polarity is sent to the transmission line 1a at a certain time interval SPC from the falling point of the data signal D8 (not shown in FIG. 4).

Since the check pulse CI-111 is received by the check circuit 7 of the command unit 1, the check circuit 7 determines the unit group 2 from the contents of the counter 6. , Jishitsuku Pulse C
l1l) has negative polarity, the transmitter/receiver unit 3゜b
It is determined that the transmitter/receiver unit 3ob is normal based on the presence of the check pulse CHb11.
7i ril. If the check circuit 7 does not receive this check pulse 011b, the check circuit 7
It is determined that the transmitting/receiving unit 3o1) is not operating normally due to a failure such as a disconnection, and appropriate processing is performed. Then, the command unit 1 outputs a check pulse C1
As shown in FIG.
This is transmitted to the transmission lines La and Lb to the transmitting/receiving unit]~3oa.

3ob, 31a, 31b-3na, 3
nb, and the count value of the counter provided there becomes "1". As a result, the transmitter/receiver unit 3Ia to which the count value "1" is assigned is now
, 311+ are allowed. Thereafter, in the same manner, each time the command unit 1 generates a counting pulse, the transmitting/receiving units 3°a, 3o1), 3ta.

31b, . . . 3na, 3nb counter counter l-
1 shift changes sequentially, and the transmitting/receiving unit 1 of the unit group to which that one value is assigned is allowed to mutually transmit/receive operations, and then the unit group 2 [
When the transmission/reception operation between the one transmission/reception unit 3na and 3nb is completed and one cycle of operation is completed, the counter pulse generator 4 circuit 5 generates the reset pulse P20 again, and the next one cycle of operation is performed.

By the way, for example, in the transmitting/receiving unit 3oa, if the control circuit 1G fails and a high-level signal or a low-level signal continues to be emitted from the output terminal Oa, or
3 is short-circuited, a positive free current signal or a negative direct current signal is continuously output to the output line 31 and transmitted to the transmission lines La and Lb. Relet pulse F'20 + counting pulse P21 to P2 n transmitted to , check pulse CHa ,
It becomes impossible to distinguish between CHb and data signals 01 to DB, resulting in a problem that the entire system becomes unable to transmit and receive. To deal with this, the present embodiment operates as follows. That is, for example, the transmitting/receiving unit t-
When a positive free current signal or a negative direct current signal is continuously outputted to the output line 31 where A5<j to 3oa, this signal is received by the receiving circuit 13 and sent to the controller 1 via the roll circuit 16 to the check circuit 29. The check circuit 29 checks that this positive DC signal or negative DC signal is not in the form of a pulse, that is, reset 1 to pulses P2o, i'l, therefore pulses P2r to P2n, check pulses CHa, CH.
b, 7' - Since the signal width is longer than any of the evening signals D1 to D8, it is determined that there is an abnormality and the switch 30 is turned off, so that the relay 20 is disconnected and returns to normally open contact 20a. Now the output horn line 31 is turned off.
is cut off from the transmission path La. This results in output line 3
The DC abnormal signal outputted in step 1) is no longer transmitted to the transmission lines La and Lb, and the unit groups 2 to 20 other than unit group 2o perform normal transmission and reception operations. Then, when the output line 31 is cut off from the transmission line La, the check pulse Cl-18 from the transmitter/receiver unit 3oa is no longer transmitted to the transmission lines 1a and 1b, so the command unit 1 It is determined that this is a failure and appropriate processing is performed. Moreover, in this embodiment, the positive power supply terminal 19 and the negative power supply terminal 2
Since the relay 20 is connected between the DC power supply and the DC power supply via the switch 30, if the DC power supply fails or there is a voltage shortage, the relay 20 will return to normal state and turn off the normally open contact 20a. In this case as well, the command unit 1 determines that the transmitter/receiver unit 3[]a is at fault.

The above is a description of the transmitter/receiver unit 3a, but the other transmitter/receiver units 3b and 3ua.

31b,...3 na, 3 nb also check circuit 2
A check circuit similar to 9 is included to check for DC abnormal signals.

In addition, in Example C described in (G), when the transmitting and receiving unit determines that the count value of the counter pulse output from the command unit matches the J runt value assigned in advance to the transmitting and receiving unit, the determination is made. Instead, C causes pulsed data signals to be sent and received between the determined sending and receiving units and the command unit. You can also do this.

However, the present invention is not limited to the embodiments described above and shown in the drawings, and may of course be practiced with appropriate modifications within the scope of departing from the gist.

〔Effect of the invention〕

As explained above, in the present invention, when the data signal output from the transmitter/receiver unit is a DC abnormal signal, this can be checked by the check circuit and the output line of the transmitter/receiver unit can be disconnected. This has the excellent effect of reliably preventing the system from becoming unable to transmit or receive data.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram showing the overall system configuration, FIG. 2 is a block diagram showing the configuration of the powerful command unit 1, and FIG. 3 is a transmitting/receiving unit. FIG. 4 is a waveform diagram for explaining the operation. In the drawing, 1 is a command unit, 2o, 21,...
211 is Units [~Group, 3oa, 3ob
, 3. a. 31b, . 5 is a counter pulse generation circuit, 6 is a counter, 7 is a data vine circuit, 133 is a receiving circuit, 16 is a controller 1 to roll circuit, 20 is a relay, 21 is a transmitting circuit, 2
9 shows the electrical circuit, 30 shows the switch, and 31 shows the output J line. Applicant East Co., Ltd. fJIJ Manufacturing Company M1
Figure 3 Figure 0a Figure 4

Claims (1)

[Claims] 1. A counter that is equipped with a command unit that transmits counter pulses on a transmission line at predetermined time intervals and then transmits INt', and a plurality of transmitting/receiving units connected to the transmission line, and a counter that is output from the command unit. Pulse Karan 1~
When the transmitting/receiving unit 1- determines that the value matches the count value assigned in advance to the transmitting/receiving unit, the determined transmitting/receiving unit or between the determined transmitting/receiving unit and the command unit 1- The device is configured to selectively transmit pulsed data signals through the transmission line at 10°C, and checks the data signals output from each transmitter/receiver unit 1 to 1 to detect an abnormality. A transmitting/receiving device characterized by a check circuit that disconnects the output line.