JPH10285195A - Simple network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save wiring in a device by incorporating various actuators, A/D converters, D/A converters and various sensors in the device in an intelligent controller having registers and a CPU, making them into units and constituting a simple network using a serial interface. SOLUTION: Address numbers on the simple network are allocated to intelligent controllers 2-5 and they are sequentially connected by a DC power source and the simple network cable of two cores shielding. The final terminal of the cable is terminated. The simple network interface circuit 12 of a host computer-side incorporates the input/output registers corresponding to the address numbers on the simple network and cyclically executes serial communication from the lowest address number to the final address number with an intelligent controller. Thus, the increase/decrease of the intelligent controller unit is simply conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple network-type wiring-saving system that uses a controller having a simple network-type interface to reduce the number of wires in a device and to construct a system in units of intelligent units.

[0002]

2. Description of the Related Art The control of actuators such as various motors, valves and relays constituting a device and input of sensor information from position detection and measurement sensors become more complicated as the device becomes larger. Wiring became enormous, putting pressure on the installation space for units and the like in the equipment, increasing the cost of wiring, causing noise due to wiring routing using parallel wiring, and causing equipment malfunction due to external noise. .

[0003] In the development of personal computers as a man-machine interface, there are RS232C and RS422 as means for communication connection. These are one-to-one connections, so each time an intelligent unit is added, RS232C is added. And the communication port of RS422 had to be increased.

[0004]

The control of actuators such as various motors, valves, and relays constituting the apparatus and the input of sensor information from position detection and measurement sensors require processing speed of control. There was a problem that wiring had to be performed. The present invention increases the installation space for units and the like in an apparatus, reduces the cost of wiring, reduces the routing of wiring by parallel wiring, and reduces the generation of noise coming from the apparatus and the malfunction of the apparatus due to external noise. Aim.

Further, the present invention does not require the use of one-to-one communication by RS232C, RS422 or the like, and makes it possible to add units simply by extending and connecting a simple network communication cable without adding a communication port. For the purpose.

[0006]

In order to solve the above-mentioned problems, the present invention uses a simple network type interface to control various actuators, perform A / D conversion, and perform D / D conversion.
A / A conversion and the like are configured in the unit, and control data communication is performed. This reduces wiring costs,
Further, malfunction of the device due to noise can be prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a CPU interface card used on a host computer side.
ISA board, VME board or PC corresponding to bus
Parallel / Serial (RS48) on MCIA board
5): CPU interface board realizing simple network type interface circuit using serial (RS485) / parallel conversion circuit, motor, valve,
A unit using the above simple network type interface circuit is used in combination with an intelligent controller with reduced wiring having an input / output circuit for controlling various actuators such as relays.

The communication of the simple network is performed by reading / writing the parallel input / output register in the simple network interface circuit composed of the parallel / serial (RS485) conversion circuit of the CPU interface card from the host CPU, thereby saving the connection connected to the simple network. Data can be read from and written to the intelligent controller of the wiring, and commands can be sent from the host CPU to the intelligent controller.

An intelligent controller on a simple network is assigned an address number on the simple network. Therefore, to add an intelligent controller to a simple network, assign a new number following the previous address, connect the DC power supply and a simple shielded double-core network cable, and if this is the last intelligent controller, enter the simple network cable here. Is terminated.

An input / output register corresponding to an address number on the simple network is built in the simple network interface circuit on the host computer side. The simple network interface circuit cyclically performs serial communication between the intelligent controller and the CPU interface card from the lowest address number on the simple network to the terminated address number, and constantly updates the latest data. ing. This simple network makes it easy to increase or decrease in units of the intelligent controller, and wiring of the device can be reduced.

[0011]

An embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the simple network system, and FIG. 2 is a diagram showing correspondence of registers in the simple network system shown in FIG. The host CPU interface card 1 of the host computer shown in FIG. 1 is a bus interface circuit 1 adapted to a CPU bus.
1 and a simple network interface circuit 12.

Simple network interface circuit 1
Reference numeral 2 denotes two registers 121a and 121b dedicated to 8-bit writing and a read-only register 1 as shown in FIG.
The register group 121 includes two sets 21c and 121d. Further, the simple network interface circuit 12 is provided with the register group 1
22, 123, and 124. For example, as shown in FIG.
It corresponds to. Four register groups 121 and 12
Four intelligent controllers 2, 3, 4, and 5 can be connected to 2, 123, and 124, respectively.
When "1" is written to the interrupt transmission flag 121aw of the write-only 8-bit register 121a of one register group 121 shown in FIG.
An interrupt flag register 21w in a register 21 in the network circuit of the intelligent controller 2 corresponding to 21a is set so as to interrupt the CPU 22. Interrupted CPU2
2 is that when "1" is written to the interrupt flag register 21w in the interrupt processing program, the interrupt flag is cleared. In this way, the host CPU interface card 1 is connected to the intelligent controllers 2, 3, 4,
Then, a process of sending a command to S.5. In addition, 21, 3
1, 41 and 51 are registers in the network circuit. Reference numerals 22, 32, 42, and 52 denote CPUs, and reference numerals 23, 33, 43, and 53 denote input / output ports.

Register groups 121, 122, 1 in the simplified network interface circuit 12 shown in FIG.
Register numbers 23 to 124 are sequentially assigned to register numbers from channel 0 to channel 15, and the channel numbers correspond to the address numbers on the simple network 13 on a one-to-one basis. For example, the number of channel 0 is assigned to the register 121a, and the number of channel 1 is assigned to the register 121b.
13a, 13b, 13c, 13d, 13e, 13
f, 13g, and 13h are network communication paths, respectively.

Simple network interface circuit 1
The communication method 2 is a cyclic method in which transmission is started from the input of channel 0, and transmission of channels is sequentially performed while confirming a response (ACK). In order to input the channel 0, the transmission on the channel 0 is started after monitoring the line of the simple network 13 and confirming that the carrier is exhausted for a certain time.

The intelligent controllers 2 and 3 are connected to the simple network 13, and the intelligent controllers 4 and 5 are
FIG. Communication starts from channel 0 in a cyclic manner, and channel 2
The communication from channel 7 to channel 7 is performed, and when channel 8 is reached, channel 8 is absent and the simple network 13 is terminated. If there is no carrier after a certain period of time, communication on channel 0 starts again.

As described above, simply connecting the required number of intelligent controllers to the simple network 13 can easily increase or decrease the number of intelligent controllers. The receiving side (intelligent controller side) receives only the packet data of the address corresponding one-to-one with its own channel number and transmits an acknowledgment (ACK) signal. Host CPU interface card side (transmission side)
Then, for an input other than channel 0, the address corresponding to the channel number of the data is monitored on a one-to-one basis, and if an address one before the own address comes, preparation is started, and then data is transmitted. Like

Since the data on the simple network 13 is always updated to the latest data only by the simple network interface circuit 12, the host CPU on the host computer side and the CPU on the intelligent controller side need only register Communication can be performed simply by reading or writing the contents of.

[0018]

According to the present invention, with the above-described configuration, the unit network of the simple network interface circuit 12 can be used for the simple network 13 rather than the conventional one-to-one connection using serial communication by RS232C or the like. The control unit (intelligent controller) can be easily added simply by extending the cable, and it is not necessary to route the parallel input / output cable for control, which contributes to the reduction of wiring in the device.

[Brief description of the drawings]

FIG. 1 is a block diagram of a simplified network system showing one embodiment of the present invention.

FIG. 2 is a diagram showing a correspondence relationship between registers on a simple network.

FIG. 3 is a block diagram of a simplified network system showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Host CPU interface circuit 2, 3, 4, 5 Intelligent controller 11 Interface circuit 12 Simple network interface circuit 13 Simple network 14 Termination 21, 31, 41, 51 Register in network circuit 22, 32, 42, 52 CPU 23, 33, 43, 53 I / O port

Claims (1)

[Claims] 1. A group that requires various actuators such as motors, valves, and relays in a device, measurement sensors, position detection sensors, A / D conversion, and D / A conversion using a simple network type serial interface. A simple network system that is unitized and intelligently executes system control and data communication.