KR940003328B1 - Manufacturing automation protocol network interface unit - Google Patents

Abstract

The MAP network interface for data exchange between the central processing unit and a Mini-Map comprises a micro-processor (M) to control peripheral devices, a latch (L) to recognize address data bus, a bus transceiver (BT) for two-way transmission, system RAM (SDRAM) and ROM (SROM), a bus control modem to control system bus access between the processor and a token-bus controller, a system RAM controller (DRC), a token-bus controller (TBC) for data transmission between CPU and the transmission media, and an interface for personal computer communication.

Description

Map network interface device

1 is a block diagram of a MAP network interface device of the present invention.

2 is a flowchart of a map network interface for the present invention.

* Explanation of symbols for main parts of the drawings

M: microprocessor L: latch

BT: Bus Transceiver SROM: System ROM

NVRAM: Nonvolatile RAM TBC: Token Bus Controller

DRC: Dynamic RAM Controller SDRAM: System RAM

DPRAM: Dual Port RAM PCBI: Personal Computer Bus Interface

ALE: Address latch enable signal UCS: Upper memory chip select signal

MCS: Intermediate memory chip select signal PCS: Peripheral circuit chip select signal

DRAM: Dynamic RAM

The present invention relates to a Map Automation (MAP) network interface device for communication between a personal computer bus interface and a transmission medium as a Manufacturing Automation Protocol (MAP) network interface device for a general purpose map (MAP) connection device.

Conventionally, when manufacturing CIM (Computer Integrated Mdnufacturing), which is a variety of manufacturing equipments in a breakdown in the field of production automation for factory automation, the above manufacturing equipments must communicate with each other, but it is an international standard communication protocol (MAP) or mini Since a map network interface device capable of communicating with a Mini-MAP network is not designed separately, a network other than the international standard communication protocol has been used.

However, the present invention exchanges information with map interface devices of other nodes by using a map (MAP) network interface device for constructing a single integrated network using mini map, which is an international standard communication protocol, for various manufacturing equipments in a factory. Communication between the personal computer bus interface and the transmission medium is made possible.

To this end, the present invention transmits and receives data in both directions with a microprocessor (M) controlling peripheral hardware and a latch (L) separating the address data bus according to the address latch enable signal (ALE), as shown in FIG. Bus trap transceiver (BT) and system ROM (SROM) required for the operation of the system and system RAM (SDRAM) to process the information of RAM required by the system and the system bus during the processor and token bus control period. Controls bus arbitration logic, modems and decoders (D), system ROM (SROM), system RAM (SDRAM), nonvolatile RAM (NVRAM) and system RAM (SDRAM), which mediate the usage rights of Dynamic RAM Controller (DRC), Token Bus Controller (TBC), Dual Port RAM (DPRAM), and Personal Computer Bus Interface, which are responsible for transmitting and receiving data between the central controller and the transmission medium. It consists of (PCSI).

The microprocessor (M) uses Intel's 80186 microprocessor operating at 10 MHz, and includes a clock generator, direct memory access (DMA) controller, timer / counter, and memory / peripheral selection logic, in addition to the same functions as the 8086 microprocessor. Therefore, it controls the surrounding hardware such as interrupt processing and data input / output control.

In addition, the lattice L is used to separate the address and data bus according to the address latch enable signal ALE, and the bus transceiver BUS TRANCEIVER transmits and receives data in both directions and is connected to the data bus.

The system ROM (SROM) is a memory area in which software necessary for operating the system is loaded.

System RAM (SDRAM) is a dynamic memory controlled by the Dynamic RAM Controller (DRC). It not only provides the RAM required by the system but also transfers information between the personal computer bus and the transmission medium through the Dual Port RAM. As an area for processing, the system processor and token bus controller (TBC) share a structure.

Non-volatile RAM (NVRAM) is an area for permanent storage of unique variables used in the network.

The personal computer bus interface (PCSI) is a part used for communication between the MAP network interface device and the personal computer bus, and the dual port RAM plays a role in the circuit (FIG. 1) of the present invention.

The token bus controller unit (TBC) is a sub-layer of medium access control (MAC) of a mini map, and is responsible for transmitting and receiving data between a main control unit (MCU) and a transmission medium.

The token bus controller (TBC) plays a role in which the microprocessor (M) receives the information received by the microprocessor (M) at the initial stage of startup and sequentially receives the data in the middle data area and requests processing accordingly. The bus arbitration logic consists of circuits that arbitrate the use of the system bus during the processor and token bus control periods.

The modem unit corresponds to the physical layer of the mini-map network and is connected to a token bus controller (TBC) and a 5 Mbps coaxial cable which is a transmission medium.

Operation of the present invention configured as described above will be described with reference to the flowchart of FIG.

First, when the processor is initialized (step 1), initialization of the entire system including initialization of the token bus controller (TBC) and the modem is performed (step 2). After the initialization of the system is completed, the system is ready to send and receive data. If the data is transmitted from the central control unit (MCU) to the modem, the data transmission mode is entered (step 3). Initially, data from main controller is transferred to system RAM through dual port RAM (DPPRM) (step 4). At this time, the data is transferred by the processor to the token bus controller (TBC) (step 6) and modem. In step 7), the data is transmitted to the transmission medium (step 8). Therefore, upon data reception (step 9), deika is transmitted to the token bus controller (TBC) (step 11) via the modem (step 10).

At this time, the token bus controller stores these data in the system RAM (step 12) and transfers the data to the dual port RAM (DPRAM) by the microprocessor (step 13). Step 14). Therefore, the MAP interface device of the present invention exchanges information with MAP interface devices of other nodes, and exchanges and receives information required by the host according to the request of the central controller.

As such, the present invention has the effect of enabling the map network interface device to exchange information with the map interface devices of other nodes by enabling the interface between the central controller and the mini map in the mini map network.

Claims (1)

Necessary for the operation of the system and the microprocessor (M) that controls the peripheral hardware, the latch (L) that separates the address data bus according to the address latch enable signal (ALE), and the bus transceiver (BT) that transmits and receives data in both directions. The system ROM (SROM) and the system RAM (SDRAM) to process the information required by the system, the bus mediation logic and modem to arbitrate the usage rights of the system bus during the processor and token bus control periods. Decoder and system RAM (SROM) to store programs and data, Dynamic RAM controller (DRC) to control nonvolatile RAM (NVRAM) and system RAM (SDRAM) and data between central controller and transmission media Personal computer bus interface (P) that connects the communication between token bus controller (TBC), dual port RAM (DPRAM), and personal computer. And CSI), so that the MAP network interface device communicates with the personal computer bus interface and the transmission medium.