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I/O scanner for an industrial control

  • US 4,750,150 A
  • Filed: 07/28/1986
  • Issued: 06/07/1988
  • Est. Priority Date: 06/25/1984
  • Status: Expired due to Term
First Claim
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1. An input/output system for an industrial control system which comprises:

  • a control processor having memory means for storing an input image table, an output image table, and configuration data, and having a serial output port for transmitting data packets and command packets, and having a serial input port for receiving data packets; and

    a plurality of I/O modules each having a serial input port and a serial output port, the I/O modules being connected in series, and the input port of the first I/O module being connected to the serial output port of the control processor and the serial output port of the last I/O module being connected to the serial input port of the control processor to form a serial I/O ring, and the serial input port of each module being selectively connected to the serial output port of that module, and wherein each I/O module includes;

    (a) a temporary storage latch for storing data packets received at the serial input port of that I/O module, and for selectively sending data packets to the serial output port of that I/O module;

    (b) an output latch for applying output data from a data packet received from the temporary storage latch to a set of output terminals;

    (c) an input latch for selectively applying input data received at a set of I/O module input terminals to the serial output port of that module;

    (d) configuration means operatively connected to the temporary storage latch for controlling the operating configuration of the I/O module, the configuration means including a configuration latch; and

    (e) control means operatively connected to the temporary storage latch, the output latch, the input latch, the configuration means, the serial input port and the serial output port for directing data through the I/O module whereby upon receipt of a first data packet at the serial input port, input data from the input latch is directed to the serial output port and said first data packet is directed to the temporary storage latch, and upon receipt of a next data packet consecutively after said first data packet, the contents of the temporary storage latch are directed to the serial output port and said next data packet is directed to the temporary storage latch, and upon receipt of an update command pocket at the serial input port, the contents of the temporary storage latch are directed to the output latch and the update command packet is directed to the serial output port, and upon receipt of a configure command packet at the serial input port, the contents of the temporary storage latch are directed to the configuration latch and the configure command packet is directed to the serial output port.

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