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 pcl-722 image

144-bit Digital I/O Card  


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The PCL-722 is a full-size PC add-on card that offers 144 programmable digital I/O lines divided into six main ports. Each port emulates the operation of an 8255 Programmable Peripheral Interface (PPI) in mode 0, but provides higher driving capacity than the 8255. Each port in turn consists of three subsidiary 8-bit ports (A, B, C). You can individually configure each of these 8-bit ports by software for input or output.

The PCL-722 provides an additional read-back function which lets you monitor the digital output status by taking readings directly from the output port.




  • High-density mixed digital I/O
  • Digital I/O control
  • Industrial monitoring and control
  • Interfacing with parallel I/O devices
  • Direct interfacing with Opto-22 compatible I/O module racks




  • 144 digital I/O lines
  • Emulates 8255 PPI mode 0
  • Buffered circuits for higher driving capacity than the 8255 Interrupt handling
  • Output status readback
  • Pin-compatible with Opto-22
  • I/O module racks




  • I/O lines: 144 (24 bits x 6 ports)
  • Programming mode: 8255 PPI mode 0
  • Interrupts: Bits 0 and 3 of port C can generate an interrupt to IRQ2, 3, 4, 5, 6 or 7
  • Digital output:
    Port A and Port B
    Logic 0: 0.4 V max. @ 12 mA (sink)
    Logic 1: 2.4 V min. @ 800 mA (source)
    Port C
    Logic 0: 0.5 V max. @ 24 mA (sink)
    Logic 1: 2.0 V min. @ 15 mA (source) Digital input:
    Logic 0: 0.8 V max.
    Logic 1: 2.0 V min.
    Transfer rate:
    300 Kbytes/sec typical
    500 Kbytes/sec max.
  • Connectors:
    Six 50-pin male ribbon-cable connectors. Pin assignments are fully compatible with Opto-22 I/O module racks
  • Dimensions: 13.2" (L) x 3.9" (H) (334mm x 99mm)
  • Power consumption:
    5 V @ 1.3 A typical , 1.8A max.

Ordering Information




144-bit Digital I/O Card, utility disk and user's manual

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