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24-bit Digital I/O Card   


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The PCL-724 offers 24 programmable digital I/O lines on a half-size PC add-on card. Each port emulates the operation of an 8255 Programmable Peripheral Interface (PPI) chip in mode 0 but provides a higher driving capacity than the 8255.

The PCL-724's 24 bits of DI/O are divided into three 8-bit ports (A, B and C). You can configure each of these ports individually by software for either input or output. The card can directly control SSR carrier modules through a 50-pin Opto-22 compatible connector.

The PCL-724 is a low-cost alternative to the PCL-722 for applications that require up to 24 I/O channels. Like the PCL-722 it provides a readback feature which lets you monitor the status of the output by reading back the output port directly.




  • Digital I/O control
  • Industrial monitoring and control
  • Interfacing with parallel I/O devices
  • Interfacing with Opto-22 compatible I/O module racks




  • 24 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: 24 (8 bits x 3 ports)
  • Programming mode: 8255 PPI mode 0
  • Interrupt: Bit 0 of port C can generate an interrupt to IRQ2, 3,4,5,6 or 7
  • Interrupt triggering: Rising or falling edge triggering, jumper-selectable
  • Digital output:
    Logic level 0: 0.5 V max. @ 24 mA (sink)
    Logic level 1:2.0 V min. @ 15 mA (source)
  • Digital Input:
    Logic level 0: 0.8 V max.
    Logic level 1: 2.0 V min.
  • Transfer rate:
    300 Kbytes/sec typical
    500 Kbytes/sec max.
  • Connectors: 50-pin male ribbon-cable connectors. Pin assignments are fully compatible with Opto-22 I/O module racks
  • Dimensions: 4.9" (L) x3.9" (H) (125 mm x 100 mm)
  • Power consumption:
    5 V @ 0.5 A typical
    5 V @ 0.8 A max.

Ordering Information




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

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