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Abstract

An industrial I/O controller is implemented on a processor board and includes two I/O daughter boards which are mounted on and parallel to the processor board by means of connectors such that the entire system occupies only a single slot space of a VMEbus back plane. The processor board includes a VMEbus connector attached to its upper right-hand edge. First buffer circuitry, a static RAM, second buffer circuitry and an EPROM are located from right to left along the upper edge of the processor board. Two connectors for attachment of two I/O daughter boards are located in the lower part of the processor board. All digital and analog input/output circuitry is included on the I/O daughter boards, which cover the lower two-thirds of the processor board, on which a crystal oscillator, an interrupt handler, an interrupt generator, arbitration bus controller circuitry, dynamic RAM, dynamic RAM control circuitry, dynamic RAM decoder circuitry, optical isolation circuitry and optical isolation control circuitry are located. The EPROM, SRAM, interrupt handling and generating circuitry, a programmable timer, and DRAM control and decoding circuitry are located around and close to the microprocessor.

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First Claim