JPH0351141B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load control system using time division multiplex transmission.

The conventional example shown in Figure 1 shows the configuration of this type of control system using a dedicated transmission line.
A series of digital signals as shown in FIG. 2 are periodically transmitted from the terminal device 2 to a plurality of terminal devices 2.
This digital signal includes a terminal address signal of several bits (e.g., 8 bits), a load control signal of several bits (e.g., 4 bits), and a long pulse signal (for waiting for a reply) having a pulse width of several bits (e.g., 4 bits). By short-circuiting the transmission line during this waiting signal, a sensor monitoring signal of several bits is sent back from the terminal device 2 to the main control panel 1.

The maximum number of terminal devices 2 connected to the transmission line 3 is 256 if the terminal address signal is 8 bits, but as this number increases, the period (polling period) at which each terminal device 2 is accessed becomes longer. Therefore, there is a problem in that, for example, there is a long delay time (up to about 2 seconds) from when the switch is pressed until the light turns on.

Therefore, conventionally, as shown in Figure 3, a method has been adopted in which the boring period of terminal devices connected to frequently used loads is shortened preferentially, and the period of non-priority terminal devices is lengthened by that amount. was. In the figure, terminals with addresses 01H to 04H are always accessed every 6th as a priority terminal, and instead, non-priority terminals 10H, 11H, 12H, 13
H, . . . are accessed at approximately three times the frequency before the improvement (in the case of FIG. 2). This has the advantage that frequently used important loads can be processed with almost no time delay after the sensor is activated.
There was a problem in that the processing of loads that were used infrequently (for example, fire alarms, security devices, etc.) was delayed accordingly.

Therefore, in order to solve the above-mentioned problems, the present invention increases the access frequency of normal terminals by excluding loads related to specific sensors (for example, disaster prevention devices, crime prevention devices, etc.) from the normal boring cycle. In addition, the purpose is to enable access to related terminal groups without delay when these sensors are activated.

Embodiments of the present invention will be described in detail below with reference to FIGS. 4 to 6. In FIG. 4, the main control panel 1 is composed of a transmitting section 11, a receiving section 12, a control section 13, etc., and the control section 13 includes a CPU, a program
A memory, ie, an address setting unit, is provided along with a ROM and the like, in which the order in which terminal addresses are sent is stored. In the present invention, as this address setting section,
A normal address setting section 14 and an emergency address setting section 15 are provided, and the emergency address setting section 15 includes:
The addresses of the terminals associated with the load groups La, Lb, etc. that operate in response to specific sensors Sa, Sb, etc. are set in advance. Generally, terminal addresses that are not registered in the normal address setting section 14 are used as these related terminal devices, but even if non-priority terminals in the normal address setting section 14 are registered redundantly in the emergency address setting section 15, good.

In the normal state, the main control panel 1 sends transmission signals according to the order of addresses set in the address setting section 14, and each terminal 2 sends a control signal in the transmission signal only when it receives its own address. In addition, if sensors Sa, Sb, Sc, and Sd are connected to the terminal, the on/off states of these sensors are mainly controlled as sensor monitoring signals. Return to control panel. The main control panel constantly monitors these return signals, and if there is any change in the light sensor, temperature sensor, etc., a control signal is sent to the related terminal device according to the order of address transmission in the normal cycle, and the lighting Controls equipment, air conditioners, etc. Next, when a specific sensor, for example, the fire detection sensor Sa connected to the priority terminal 04H in FIG. When it is detected that the logical value of the first bit has changed since the previous boring, the normal cycle is temporarily switched to the emergency cycle as shown in FIG. 6, and the address set in the emergency address setting section 15 is Signals are sent in accordance with the order. In FIG. 5, terminal addresses 50H, 52H, 60
H, ..., 68H are related terminals registered in the emergency address setting unit 15 corresponding to the above-mentioned specific sensor, and these loads (for example, fire shutters, fire extinguishing equipment, etc.) are immediately removed by the emergency cycle.
A command is issued. In this embodiment, a sensor (non-priority terminal 12H) whose importance has increased due to the operation of a specific sensor (terminal 04H)
remains as a priority terminal even after the emergency cycle ends.

The present invention is configured as described above, and since a group of terminal devices that are infrequently used can be excluded from the address of the normal cycle, the period of the normal cycle can be shortened, and it is possible to access terminal devices in the normal cycle. This has the advantage that even terminals that are not connected can be accessed without delay in an emergency, and the performance of this type of time-sharing load control system can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the schematic configuration of a conventional example.
FIG. 2 is an explanatory diagram of the same operation as above, FIG. 3 is an explanatory diagram of another conventional example, FIG. 4 is a block diagram showing a schematic configuration of an embodiment of the present invention, and FIG. 5 is an explanatory diagram of the same as above.
FIG. 6 is a flow chart similar to the above. 1 is the main control panel, 2 is the terminal device, 3 is the transmission line, 11
is a transmitting section, 12 is a receiving section, 13 is a control section, 14 is a normal address setting section, 15 is an emergency address setting section, Sa, Sb, Sc, Sd are sensors, La, Lb, Lc,
Ld is the load, 01H, 02H, ... are the terminal addresses.

Claims (1)

[Claims] 1 The main control panel periodically polls multiple terminals using a transmission signal consisting of a terminal address signal of several bits, a load control signal of several bits, and a long pulse signal for waiting for a response of several bits. ,
In a load control method in which each terminal device controls the load using a load control signal only when it receives its own address, and also sends back a several-bit sensor monitoring signal, the main control panel is informed of the order in which addresses are sent in a normal cycle. A normal address setting section in which addresses are stored and an emergency address setting section in which address transmission order of emergency cycles are stored are provided, and the addresses of related terminal devices of load groups that operate in response to specific sensors are set in advance. , a time-sharing load control method characterized in that when the main control panel detects that the returned specific sensor monitoring signal has changed since the previous polling, the polling order is temporarily switched to the emergency cycle. .