JPH03187538A - Time division multiplex transmission system - Google Patents

Abstract

PURPOSE:To save labor for inspecting the operation of a central supervisory and controlling device and to prevent the inspection from being defective by the operation miss of a worker by simulating the fault of a terminal equipment with an arbitrary address and automatically simulating the operation of a terminal equipment for both supervisory and control. CONSTITUTION:In a dummy terminal equipment 1 of a central supervisory and controlling device A, a communication processing part 13 is provided so as to change setting by the dummy terminal equipment 1 even after activating the system by an external data setting part 2, and therefore, the fault of the terminal equipment with the arbitrary address is simulated. Concerning the terminal equipment for both supervisory and control, the supervisory state is made coincident with control contents and a supervisory signal is returned to notify that the supervisory state is changed. Therefore, the operation of the terminal equipment for both supervisory and control is automatically simulated. Thus, the labor can be saved for inspecting the operation of the central supervisory and controlling device A and the accuracy of the inspection can be prevented from being lowered by the operation miss of the worker.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time division multiplex transmission system equipped with a pseudo terminal device, and is used, for example, in a building management system, when an actual terminal device is not connected. It is used to inspect the operation of central monitoring and control equipment.

[Prior Art] FIG. 3 is a schematic diagram of a conventional general time division multiplex transmission system. In this system, one central monitoring and control device A and a plurality of terminal devices B, , B2 . ...B and are connected via a two-wire transmission line such as a coaxial cable or twisted pair wire. FIGS. 4(a) and 4(b) show the time division multiplexed transmission signal sent from the central monitoring and control device A to the transmission line L, and the terminal device BB2. ...+B The waveforms of the reply signals returned from N to the central supervisory control device A via the transmission line are shown. The time division multiplex transmission signal includes, in one frame FR, a start pulse ST indicating the start of signal transmission, and a terminal device Bi (i=1.2...
, N), a control pulse DT for controlling the operation of the terminal Bi, and a reply standby pulse R for receiving a reply signal from the terminal Bi.
It contains at least T. The address pulse AD and control pulse DT are composed of a plurality of bits of serial signals in which, for example, a through voltage pulse means "1" and a short voltage pulse means "0". In the reply standby pulse RT, for example, a voltage is applied between the lines of the transmission line on the side of the central supervisory control device A, and the lines of the transmission line are short-circuited via a resistor on the side of the terminal Bi. A multi-bit serial signal indicating that a long current pulse is "1'" and a short current pulse is "O" is sent back to the central supervisory control device A. Address pulses AD and control pulses DT are sent as low-impedance voltage signals from central monitoring and control equipment A, and each terminal Bi connects a rectifier and a smoothing capacitor between the transmission lines to obtain operating power. There is. The address pulse AD included in the time division multiplex transmission signal sent from the central supervisory control device A is transmitted to each terminal device B.
i is changed, for example, by cyclic polling, and only one terminal device B with a matching address performs the control operation and reply operation. When the terminal Bi receives the start pulse ST from the transmission line, it receives the following address pulse AD and checks it against its own address. If the addresses do not match, wait for the next start pulse ST to be received; if the address pulse AD matches its own address, the subsequent control pulse DT
is received, and a control operation is performed in accordance with this control pulse DT.

Also, the fourth response waiting pulse RT following the control pulse DT
A reply signal (monitoring pulse) as shown in Figure (b) is sent out.

When using the above-mentioned time division multiplex transmission system, for example, in a building management system, terminal equipment compatible with various building equipment is required depending on the type and quantity of building equipment determined by the purpose and size of the building. It is necessary to connect Bi to the transmission line and store the configuration of the connected terminal Bi in the memory table of the central supervisory control device A. For example, N=25
In the case of 6, for i=1 to 256, whether or not the terminal Bi is connected is stored, and if the terminal Bi is connected, its type is stored. If the terminal device Bi is not connected, polling of its address can be omitted, so that the cycle of supervisory control by the central supervisory control device fiA can be shortened. In addition, the type of terminal device Bi is, for example, a terminal device for controlling an air conditioning load or a lighting load, a terminal device for monitoring security sensors or fire detectors, or a terminal device whose condition needs to be frequently monitored. This data indicates whether the terminal device Bi is a certain terminal device, etc., and the central monitoring and control device A performs monitoring and control operations according to the type of each terminal device Bi.

[Problems to be Solved by the Invention] By the way, when testing the operation of the central monitoring and control device in a factory or the like, it is difficult to connect all the actual terminal devices. Therefore, a pseudo terminal device that simulates the operation of an actual terminal device is connected to the transmission line, and this pseudo terminal device is used to test whether the central supervisory control device operates normally. It is necessary to set in advance to this pseudo terminal device whether or not an actual terminal device is connected and, if a terminal device is connected, its type before starting the system. However,
Conventionally, if the data of a pseudo terminal device is set before the system is started, it is difficult to change it after that, so it has not been possible to simulate loss of a reply signal due to a failure of one of the terminal devices. In addition, when simulating the operation of a terminal device exclusively for control, the received control signal is displayed on a display panel, and when simulating the operation of a terminal device exclusively for monitoring, such as a fire detection terminal or a security sensor terminal, the received control signal is displayed on a display panel. The monitoring status to be sent back was set and stored in advance. Therefore, when simulating the operation of a terminal device that is used for both control and monitoring, workers must visually confirm that the display on the display panel has changed, and then manually change the monitoring status. This simulated the operation in which the monitoring status changes depending on the control details. For this reason, it is difficult to automate the operation inspection of the central monitoring and control device.
Further, there is a problem in that if an operator makes an operational error, it is not possible to perform an accurate operation test.

The present invention has been made in view of the above points, and its purpose is to enable setting of a pseudo terminal device for testing the operation of a central supervisory control device in a time division multiplex transmission system even after the system is started. In addition to making it possible to simulate failures of terminal devices by freely changing from There is a particular thing.

[Means for Solving the Problems] In the present invention, in order to solve the above problems, the first
As shown in FIGS. 4 to 4, a plurality of terminals B, , B2 . . . are assigned unique addresses. ...The BN is connected to the central monitoring and control device A via a common transmission line, and each terminal device Bi(i
=1.2. . . , N) and transmits a control pulse DT to a plurality of terminals B1. B z ,...,BN
A pseudo terminal device 1 that simulates the operation of is connected to the transmission line,
A data setting unit 2 for setting the presence/absence and type of each terminal B, B2゜..., BH in correspondence with the address is connected to the pseudo terminal device 1, and the pseudo terminal device L is connected to the A multiplex transmission signal processing unit 11 that performs reception processing and reply processing of multiplex transmission signals, a communication processing unit 13 that reads out the storage contents of the data setting unit 2, and a terminal device whose address is included in the received multiplex transmission signal. If it is stored in the data setting section 2 that it does not exist, the reply processing by the multiplex transmission signal processing section 11 is canceled and the terminal device with the address included in the received multiplex transmission signal is a terminal device for both control and monitoring. If it is stored in the data setting section 2, the transmission data processing section 12 matches the monitoring state with the control content and causes the multiplex transmission signal processing section 11 to perform a reply process to notify the change in the monitoring state. It is characterized by this.

[Operation] According to the present invention, as described above, the pseudo terminal device 1 is provided with the communication processing section 13, so that the settings of the pseudo terminal device 1 can be changed by the external data setting section 2 even after the system is started. Therefore, it is possible to simulate a failure of a terminal device at any address. In addition, regarding terminal devices for both control and monitoring,
Since the monitoring status matches the control content and the monitoring signal notifying the change in the monitoring status is sent back, it is possible to automatically simulate the operation of a terminal device used for both control and monitoring. . As a result, it is possible to save labor in inspecting the operation of the central monitoring and control device, and it is possible to prevent a decrease in inspection accuracy due to operator errors.

[Example] FIG. 1 is a schematic diagram of an embodiment of the present invention.

A central monitoring and control device A is connected to the transmission line, and a pseudo terminal device 1 is connected to the transmission line in place of the plurality of terminal devices B, -B. In the memory table of the central supervisory control device A, the presence or absence and type of each of the terminals B+ to BN are stored in association with the address. Further, in the memory table of the pseudo terminal device 1, the data setting unit 2 stores the presence/absence and type of each terminal device 81 to B in correspondence with the address. The data setting unit 2 is, for example, a personal computer, and is connected to the pseudo terminal device 1 via a communication interface such as r(3232C).

FIG. 2 shows the internal configuration of the pseudo terminal device 1 of this embodiment. This pseudo terminal device 1 includes a multiplex transmission signal processing section 11
, a transmission data processing section 12 , and a communication processing section 13 . The multiplex transmission signal processing section 11 has a function of receiving a transmission signal as shown in FIG. 4(a) and transmitting a reply signal as shown in FIG. 4(b). The transmission data processing unit 12 includes a memory table, and the presence or absence of each terminal device B, -BN and its type are stored in this memory table in correspondence with the address. Further, regarding the monitoring terminal device, the monitoring status is set and stored in advance. When a multiplex transmission signal is received by the multiplex transmission signal processing unit 11, the address pulse AD is read and the transmission data processing unit 12 refers to the presence or absence and type of a terminal device at that address. If a terminal device with that address does not exist, as shown in FIG. 5, the reply processing by the multiplex transmission signal processing section 11 is stopped. In addition, if the terminal device at that address is a terminal device used for both control and monitoring, as shown in Figure 6, the monitoring state is made to match the control content, the memory of the monitoring state is changed, and the monitoring state is If the terminal at that address is a control-only terminal, the control content will be displayed as before, and the monitoring-only terminal will In the case of a device, the pre-stored monitoring status is returned as in the conventional case. The received control details may be displayed on the screen of the data setting section 2, which is a personal computer or the like, or may be displayed on the display section provided in the pseudo terminal device 1.

The data setting section 2 connected to the pseudo terminal device 1 can freely rewrite the contents of the memory table of the transmission data processing section 12 via the communication processing section 13 even after the system is started. Thereby, it is possible to simulate a failure of a terminal device at an arbitrary address. For example, it is assumed that the memory table of the transmission data processing unit 12 stores that a terminal at a certain address is a monitoring-only terminal such as a fire detection terminal or a security sensor terminal. In this case, when that address is polled, the monitoring status previously stored in the memory table of the transmission data processing section 12 is sent back to the central monitoring and control device A.

In this state, if the data setting unit 2 newly sets data indicating that the terminal device at the address does not exist, the next time that address is polled, the reply processing will be canceled, so the central monitoring and control device A will: It is determined that the terminal at that address has failed, and the necessary failure indication is performed.

It is also possible to simulate the following failure behavior. For example, if a terminal device at a certain address is set to be a terminal device for both control and monitoring, after the system starts up, the terminal device at that address If the device is a terminal exclusively for monitoring, and the settings are changed, it is possible to simulate a transition from a normal state where the monitoring status changes depending on the control details to a failure state where the monitoring status does not change depending on the control details. . Thereby, the central monitoring and control device A can determine that the terminal device at that address or the MIA device connected to the terminal device has failed, and can perform necessary failure indications.

[Effects of the Invention] According to the present invention, in a time division multiplex transmission system, a pseudo terminal device that simulates the operation of a plurality of terminal devices is connected to a transmission line, and the presence/absence and type of each terminal device is associated with an address. The data setting section to be set is connected to the pseudo terminal device, and the settings of the pseudo terminal device can be changed via the communication processing section.
It is now possible to simulate a failure in a terminal device at any address, and it is also possible to automatically simulate the operation of a terminal device that is used for both control and monitoring, which saves labor in inspecting the operation of the central monitoring and control device. This has the effect of preventing inspection defects caused by operator errors.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a block diagram of a pseudo terminal device used in the same, FIG. 3 is an overall configuration diagram of a conventional general time division multiplex transmission system, and FIG. figure(
FIGS. 5 and 6 are block diagrams for explaining the operation of the present invention. A is a central monitoring and control device, B, , B2. ...,Bi,・
..., BN is a terminal device, L is a transmission line, 1 is a pseudo terminal device,
2 is a data setting section, 11 is a multiplex transmission signal processing section, 12 is a transmission data processing section, and 13 is a communication processing section.

Claims (1)

[Claims] (1) A plurality of terminal devices assigned unique addresses are connected to the central monitoring and control device via a common transmission line, and control pulses are transmitted to each terminal device according to the address specification from the central monitoring and control device, and In a time division multiplex transmission system in which each terminal device returns a monitoring pulse,
A pseudo terminal device that simulates the operation of multiple terminal devices is connected to the transmission line, and a data setting unit that sets the presence/absence and type of each terminal device in correspondence with the address is connected to the pseudo terminal device. , a multiplex transmission signal processing unit that performs reception processing and reply processing of multiplex transmission signals from the transmission line, a communication processing unit that reads the memory contents of the data setting unit, and a terminal for the address included in the received multiplex transmission signal. If the data setting unit stores that the device does not exist, the multiplex transmission signal processing unit stops the reply processing and determines that the terminal device with the address included in the received multiplex transmission signal is a terminal device for both control and monitoring. and a transmission data processing section that matches the monitoring state with the control content and causes the multiplex transmission signal processing section to perform a reply process of notifying a change in the monitoring state if the data setting section stores that there is a change in the monitoring state. A time division multiplex transmission system.