JPH0533575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a time division multiplex transmission control system used to control lighting loads, air conditioning loads, etc. in buildings and stores.

[Background technology] In this type of control system, lighting, air conditioning,
In addition to control functions such as pumps, and monitoring functions such as operation monitoring and alarm monitoring, some devices have additional measurement functions such as temperature/humidity measurement and power meter side. In that case, a host computer is usually connected to the control system, and automatic operation, optimum value control, creation of daily and monthly reports, etc. are often performed.

The measurement function has a lower priority than other functions, so
Conventionally, measurement data was collected by polling the measurement terminal from the main control panel only when a measurement request was made to the control system from the host computer. However, this conventional method has the problem that it takes too much time after the host computer issues a measurement request until the main control panel completes polling of the measurement terminal and returns measurement data.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a system of this type that can quickly return measurement data in response to a measurement request from a host computer. is to provide.

[Disclosure of the Invention] The present invention provides a main control panel 2 connected to a host computer 1 with a plurality of terminal devices 3a, 3b,
... and 4a, 4b, ... are connected via a dedicated transmission line 5, and a polling signal including the terminal device address, control data, and reply timing pulse is transmitted from the main control panel 2 to each terminal device, and the control monitoring terminal device 3a,
3b, . . . control the load based on the above control data, and send the on/off input of the detector as monitoring data to the main control panel 2, and the measurement terminals 4a,
4b... is configured to convert the measured analog input into measurement data by the A/D converter 6 and send it back to the main control panel 2, and the host computer 1 converts the measured analog input into measurement data and sends it back to the main control panel 2. In a time division multiplex transmission control system that manages
By providing a digital switch 7 that sets the polling frequency for a, 4b, ... with an integer value,
Each time the control monitoring terminals 3a, 3b, ... are polled the number of times the above setting value is subtracted by 1, the measurement terminals 4a, 4b, ... are polled by 1.
The collected measurement data is stored in the memory 8, and the measurement data in the memory 8 is returned in response to a measurement request command from the host computer 1, and the host computer controls the main control panel. When there is a request command, the control data is transmitted to the control and monitoring terminal with priority over polling to the measurement terminal, and measurement data is always collected at a low frequency and the measurement request is sent to the control monitoring terminal. By eliminating the need for polling the measurement terminal at the time of the test, the reading of measurement data into the host computer can be speeded up.

The present invention will be explained in detail below with reference to embodiment figures. 1st
The figure shows the overall configuration of the system of the present invention. A main control panel 2 connected to a host computer 1 has a plurality of terminal devices 3a, 3b, ... and 4a,
4b,... are connected via a dedicated transmission line 5, and the main control panel 2 has a CPU as shown in FIG.
9. ROM memory 1 where the program is written
0, RAM memory 8 for storing control data, monitoring data, measurement data, etc., key and display interface 1 for manual input
1, a transmitting/receiving unit 12, a host interface 13 for exchanging data with the host computer 1;
In addition to the conventional configuration including the bus line 14, etc., a DIP type digital switch 7 is provided for setting the polling frequency for the measurement terminals 4a, 4b, . . . .

As shown in FIG.
A remote control relay block 18 is connected to a general-purpose block consisting of 7, and the load is controlled by a contact output 19 based on control data from the main control panel 2, and the on/off state of the detector is read from a contact input 20. It is configured to be sent back to the main control panel 2 as monitoring data.

The measurement terminal 4, as shown in FIG. is configured to do so.
In addition, a decoder section 21 for decoding control data is provided in order to read 4 bits x 10 digits data in 10 batches.

FIG. 5 shows a memory map of the RAM memory 8. In this embodiment, 7 bytes of data can be stored in each of 255 terminal device addresses, and the terminal device type (from control/monitoring terminal S to 4 bits are used for error data, 4 bits are used for control data, and 4 bits x 10 digits are used for measurement data. In the case of monitoring data, it is stored in the first digit of measurement data. FIG. 6 is a flowchart showing the operation of the transmission control system of the present invention. Figure a shows the terminal device data processing part in the program of the main control panel 2, of which parts b and li form the main part of the present invention. In (b), the polling counter is a counter created by software, and is incremented by 1 every time a polling of a control/monitoring terminal (abbreviated as S terminal) is performed for one cycle. C, D, H, and F are for speeding up the transmission of control data to the S terminal, and when there is a control request from the host computer in G, the transmission of control data is given priority. If there is no control request, the value of the polling counter is compared with the setting value of the digital switch for setting the measurement polling frequency, and if they do not match, the
Monitoring data is collected from all S terminals at A, W, and W, and if they match, measurement polling is performed at A to B. For example, if the setting value of the digital switch is 10, measurement polling is performed once every nine times monitoring polling is performed. In measurement polling, as shown in Figure 6b, first reset the polling counter in F, select the address of the S terminal with Y, T, R, and read measurement data 10 times in a row using the same address. Then, the 10-digit measurement value is stored in the measurement data storage unit. After that, if there is a measurement request from the host computer, the memory measurement data is read out and sent to the host computer.

[Effects of the Invention] As described above, the present invention provides a time division multiplex transmission control system having a measurement function, by providing a digital switch in the main control panel that sets the polling frequency to a measurement terminal as an integer value. Every time the monitoring terminal is polled the number of times the above setting value is subtracted by 1, the measurement terminal is polled once, and the collected measurement data is stored in memory and the measurement from the host computer is performed. Since the measurement data in memory is immediately returned upon request, the host computer has the advantage of being able to read the measurement data immediately when necessary, and the frequency of measurement polling is controlled by digital data. Since it can be set arbitrarily using a switch, there is an advantage that the frequency of measurement polling can be adjusted as appropriate depending on the number of installed terminals.

Furthermore, the frequency of polling the measurement terminal is
This is a percentage of the number of polling times of the integer value set by the digital switch, which has the advantage that it is easy to understand the relationship between the set value and the polling frequency. Moreover, the host computer manages the monitoring data returned from the control monitoring terminal and the measurement data returned from the measurement terminal to the main control panel. When the host computer sends a control request command to the main control panel, the control data is transmitted to the control monitoring terminal with priority over polling to the measurement terminal. Although the main control device periodically collects measurement data in preparation for measurement request commands from the host computer, it can perform control with priority over measurement if there is a control request command from the host computer. This has the advantage that measurement does not interfere with control.

[Brief explanation of the drawing]

FIG. 1 is an overall block diagram showing an embodiment of the system of the present invention, FIG. 2 is a block diagram showing the configuration of the main control panel shown above, and FIG. 3 is a block circuit showing the structure of the control monitoring terminal device shown above. 4 is a block diagram showing the configuration of the measuring terminal device shown above, FIG. 5 is a memory map showing the structure of the memory shown above, and FIGS. 6 a and 6 b are flowcharts showing the operation of the same. 1 is a host computer, 2 is a main control panel, 3 is a control and monitoring terminal, 4 is a measurement terminal, 5 is a dedicated transmission line, 6 is an A/D converter, 7 is a digital switch, and 8 is a memory.

Claims (1)

[Claims] 1 Connect multiple terminals to the main control panel connected to the host computer via dedicated transmission lines, and transmit polling signals including the terminal device address, control data, and reply timing pulses from the main control panel to each terminal. The control and monitoring terminal controls the load based on the above control data and returns the detector's on/off input as monitoring data to the main control panel, and the measurement terminal uses the A/D converter to send the measured analog input. In a time division multiplex transmission control system that is configured to convert into measurement data and send it back to the main control panel, the host computer manages the monitoring data and measurement data sent back to the main control panel. By providing a digital switch that sets the frequency of polling to the measurement terminal as an integer value, polling to the measurement terminal will be performed every time the control and monitoring terminal is polled the number of times the above setting value is subtracted by 1. The measurement data is stored in the memory once, and in response to a measurement request command from the host computer, the measurement data in the memory is sent back to the host computer, and the host computer sends the data to the main control panel. 1. A time division multiplex transmission control system characterized in that when a control request command is received, control data is transmitted to a control monitoring terminal with priority over polling to a measurement terminal.