JPS5980096A - Time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To detect the area of disconnection within a control board by detecting disconnection of a signal line through the presence or absence of a monitor signal sent from a monitor terminal as well as the disconnection of the corresponding branch signal line from the monitor data of a monitor signal. CONSTITUTION:If the disconnection arises at a point X on a signal line 4, it is impossible for a main control board 2 to receive the monitor signals sent from the monitor terminals 12- set after the point X. Therefore the board 2 decides that the signal line 4 following a monitor terminal device 11 has the disconnection. In case the disconnection arises at a point Y of a branch signal line 4' within a control board A1, the control signal sent from terminals 11, 12- can be received by the board 2. Thus the board 2 understands no disconnection arises on the line 4. At the same time, it is known from the monitor data contained in the monitor signal of the device 11 that the monitor input is set at an L level. Therefore the board 2 can detect that the disconnection arises on the line 4' within the board A1.

Description

[Detailed Description of the Invention] The present invention connects one main operation panel and a plurality of terminal devices to each other via signal lines, so that the load connected to each terminal device can be centrally monitored by the main operation panel. The present invention relates to a time division multiplex transmission system.

Figure 1 shows a conventional monitor-terminal device (1+) (12)...
This shows a schematic configuration diagram of the time division multiplex transmission system used in all cases, and (2) in the figure is the main operation panel.
is equipped with electronic circuits such as arithmetic and control circuits that come from the microphone 0 computer, etc., and from this main operation panel (2) monitor terminals (h) (1g)... and load control terminals (31
) For (32)..., the time division multiplex transmission signal shown in FIG. 2 is cyclically and repeatedly transmitted one after another for each address set in advance to each terminal. In the signal shown in Figure 2, a wide pulse represents a logical value "1", a narrow pulse represents a logical value "0", and a slightly wide start pulse ST ( !-1 1-pit pulse with logical value "l", m-hit address signal AD for selecting a predetermined terminal, 1-hit address parity AP, 1-pit pulse with logical value "1", the corresponding n-hit control data signal Ji!fCD that sets the control content in the called terminal device, l-hit control data parity CP, return signal, and a return waiting signal of 5 to 6 pits or more as a waiting period. It full-wave rectifies the signal power sent through the forward signal line (4) and the branch signal line (4)' and uses it as its own operating power source, and the control data signal Ji!rCDTh included in the above signal. After reading the data, the load control terminals (31), (32), etc. control the load (5), and during the period when the main operation panel (2) sends the return standby signal, the signal line (4) and the branch signal By short-circuiting the wire (4)'' through a suitable ishipetance, a monitoring signal such as that shown in Fig. 3 can be transmitted to the main control panel (2) in current mode.
It is possible to send it back to the side. @I in figure 3
N1 to INS are monitoring data, and P is a parity hit. Also in the monitoring signal, a wide current pulse represents a logical value of 11'', and a narrow current pulse represents a logical value rOJ.

By the way, the monitor terminal device (1+) (12)... is a control panel A in which the load control terminal device (3+) (3g)... is arranged.

, A2... branch signal '8 line (connected to each branch point of 4Y, and the signal line after this connection point (
4) When a short circuit occurs between signal lines (4) and +41', the built-in power failure detection circuit detects the short circuit between signal lines (4) and (4)', and performs load control that is inserted in series with each signal line (4) and +41'. The output contact (7) is automatically opened to temporarily disconnect the connection point between the monitor and the terminal (11), (12), etc., and after this disconnection operation, the main Operation board(
At the same time as the short-circuit detection means provided in 2) detects a short circuit, the monitor terminals (11), (12), and all terminals are sequentially called from the main operation panel (2) in order of proximity to the main operation panel (2), and their load control outputs are Turn on the contact (7), and then turn on the main operation panel (2).
When a short circuit is detected by the above-mentioned short circuit detection means of
4), (4)' can be determined from the main operation panel (2) if there is a short circuit. Also, during normal access from the main operation panel (2), each monitor and terminal (1+) (
12) ... is designed to send back a monitoring signal,
When this monitoring signal is received by the main operation panel (2), the monitor terminal (1+) (12)...and the signal line (4) in front of it is disconnected and the main operation panel (2) is received. It can be detected using the operation panel (2).

By the way, in this conventional system, one monitor and one terminal (1+)
(12) A method is used to detect the presence or absence of a disconnection based on the presence or absence of a monitoring signal from the can be detected, but only one terminal (monitor)
1+) (12) Even if a disconnection occurs at, for example, point Y of the branch signal line (4)' in control #A15A2,
Since monitoring signals were returned from each monitor and terminal device (-11)' (12)..., the main operation panel (2) could not detect the disconnection of the branch signal line (4)'. However, the terminal device (31
), but in this case, the main operation panel (2) simply determines that there is an error in the return of the terminal device.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a time division multiplex transmission system that can also detect disconnections in branch signal lines within a control panel.

This will be explained below using examples. FIG. 4 shows a schematic configuration of one embodiment, in which each monitor, one terminal (1+) (12
)... is equipped with a monitoring input terminal, and this monitoring input terminal 1
0, the voltage level at the end of the branch signal line (4) is input as monitoring data. In other words, as shown in Fig. 5, the terminal end of the branch signal line (4)' is connected to the diode bridge (6), the transmission signal on the branch signal line (4)'t' is full-wave rectified, and the capacitor ( A circuit is inserted between the monitoring input terminal 1o and the branch signal ls+4)' to smooth it with 8) and further clip it to a predetermined level with the Zener tie auto (9).The branch J@-8 line If there is no disconnection in (4), the 'H level signal is output to the monitoring input terminal IO.
In addition, if there is a disconnection, a 1L level signal will not be input to the monitoring input terminal 1o, and based on this monitoring input data, the monitor terminal (1+) (in FIG. 4, the signal line (4) If a disconnection occurs at point (2) determines that a disconnection has occurred in the signal line 8 (4) after the monitor terminal (11).Also, it is determined that a disconnection has occurred at 7 points of the signal line (4)' in the control panel A+. Then, the main operation panel (2) can receive the monitoring signal from each monitor terminal (' l+) (12), so the @ line (4)
The main operation panel (2) shows that there is no disconnection on the upper side, and the monitoring input is 11 L, according to the monitoring data included in the monitoring signal of the monitor terminal (11). The main operation panel (2) can detect that a break has occurred in the branch signal line (4)' in the control panel A,1.

In the system, the voltage level at the end of the branch signal @ line, which is branched from the signal line, is monitored and input to the control panel where all the terminals are installed, and the voltage level is connected at the branch point of the signal line and the branch signal line, and the voltage level is input from the main operation panel. Each control panel is equipped with a monitor terminal device that returns a monitoring signal 9 based on the monitoring input when called.
At the main operation panel, the monitor detects all disconnections in the signal line based on the presence or absence of the monitoring signal from the terminal, and also detects any disconnection in the corresponding branch signal line based on the monitoring data of the monitoring signal. Even if a disconnection occurs in a branch signal line, the disconnection can be detected using the monitoring data of the monitoring signal of the monitor and terminal device, and the disconnection location in the control panel can be easily found. Since it is possible to detect a break in the signal line, it has the full effect of detecting a break in the main line as before.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic configuration diagram of the conventional example, Fig. 2 is an explanatory diagram showing the format of the transmission signal, Fig. 3 is an explanatory diagram showing the format of the monitoring signal, and Fig. 4 is the entire embodiment of the present invention. 5 is a circuit diagram of the monitoring input terminal of the monitor-terminal device shown above. (I'll) (12)
・ is a monitor terminal, (2) is a main operation panel, (3+)
(32)... is a load control terminal, (4) is a signal line, and {4}' is a branch signal line. Agent: Patent Attorney Naga Ishida Seven Procedural Amendments (Voluntary) December 27, 1980 To the Commissioner of the Japan Patent Office 1. Case description 1981 Patent Application No. 191372-2. Name of the invention: Time division multiplex transmission system. 3. Relationship with the case of the person making the amendment Patent Applicant Address 1048 Bold Kadoma, Kadoma City, Osaka Name (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4 Agent postal code 530 5 Date of amendment order 8. Contents of the amendment "Clip" on page 6, line 18 to line 19 of the present specification is corrected to "classic".

Claims (1)

[Claims] +11 The main operation panel and multiple terminal devices are connected to each other via two-wire signal lines, and the main operation panel sends address signals, control data signals, and return standby signals to each terminal device @ for each address. Each terminal device has an address signal discriminator that compares the address signal on the signal line with its own address, and a control signal discriminator that generates a control output according to the control gate signal when the address signals match. In a time division multiplex transmission system comprising a monitoring input return unit that returns a monitoring signal to the main operation panel during the return standby signal period, a branch that branches from a signal line to a control panel where a terminal device is installed. A monitor-terminal device is installed on each control panel that monitors and inputs the voltage level at the end of the signal line, connects the signal line and branch signal line at the branch point, and returns a monitoring signal based on the monitoring input when called from the main operation panel. The main operation panel is designed to detect a break in the signal line based on the presence or absence of a monitoring signal from the monitor terminal, and to detect a break in the corresponding branch signal line based on the monitoring data of the monitoring signal. A time division multiplex transmission system with special features.