Description

The PCI-7248: 48-Bit Digital I/O board is a high density parallel Digial I/O board for PCI computer in industrial applications. All 48 digital I/O channels can sink 24 mA for power control application.

This board provides 2 identical chips that emulate industry standard 8255 Programmable Peripheral Interface (PPI). Each PPI offers 3 ports: PA, PB, and PC. PC is subdivided into 2 nibble-wide (4-bit) ports. Each channel has an individual connector with OPTO-22 pin assignment. It is very essential to use isolated input to prevent ground loop problems.

The PCI-7248 uses a SAIC PCI controller interface with the PCI bus. The ASIC fully implements the PCI local bus specification Rev 2.0. All bus relative configuration, such as base memory address and interrupt assignment, are automatically controlled by software. No need for any user interaction and pre-study of the configuration. This removes the burden of searching for a conflict-free configuation, which can be very time consuming and difficult in combination with other bus standards.

PCI-7248 has a programmable timer counter that can generate periodic interrupts to the host processor. The timer/counter chipset is 82C54, which includes 3 16-bit counter,at 2MHz clock input. One counter is used as an event counter for counting events coming from input channels. The remaining two are cascaded together making a 32-bit timer, which can control the rate of interrupt generation.

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Features

• Compact size (suitable for any size of chassis)
• 32-bit PCI-Bus, Plug and Play
• 48 TTL/DTL compatible digital I/O lines
• Emulates two industry standard 8255 PPI mode 0
• Buffered circuits for higher driving capacity
• Direct interface with OPTO-22 compatible I/O modules
• Programmable interrupt handling
• Output status readback

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Specifications

• Bus : 32-bit PCI
• Bus interface : slave
• Transfer rate :
  700 KB/sec typical
  150 KB/sec max
  
• Channels : 48
• Compatibility : TTL/DTL
• Reference voltage : +5 V
• Data transfer : interrupt, programmed I/O
• Input voltage :
  Logic High Voltage : 2.0 ~ 5.25 V
  Logic Low Voltage : 0.0 ~ 0.80 V
  Logic High Current : 22.0 µA
  Logic Low Current : -0.2 mA
• Output signal Port A, B :
  Logic High Voltage : 2.4 V minimum
  Logic Low Voltage : 0.5 V maximum
  Logic High Current : -2.6 mA
  Logic Low Current : 24.0 mA
• Output signal Port C :
  Logic High Voltage : 2.4 V minimum
  Logic Low Voltage : 0.4 V maximum
  Logic High Current : -15.0 mA
  Logic Low Current : 24.0 mA

Physical, Environmental

• Connector : 50-pin male ribbon cable connector
• Operating temperature : 0°C ~ 60°C
• Storage temperature : -20°C ~ 80°C
• Humidity : 5 ~ 95%, non-condensing
• Power consumption :
  +5V @ 850 mA, typical
  +5V @ 1A, max
• Dimensions : half- size, only 98.5 (H) x 147 (L) mm

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Ordering Information

PCI-7248 : 48-bit Digtial I/O Card

TB-24R : 24-bit Relay Output Board

TB-24P : 24-bit Isolated Digital Input Board

TB-18P8R : 16 Isolated Digital Input and 8 Relay Output Board

TB-24P : General Purpose Wiring Board

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