Repair Allen-Bradley 1771-DA PLC-5 ASCII I/O Module

Features

• User selectable communication rates:
  • 110, 300, 600, 1200, 2400, 4800, 9600 baud
• 1.3A backplane current requirement
• Between 8 and 10, and between 30 and 32 keying
• Passive receive circuit (pins 12 and 24):
  • Isolation:
    • 3,000VDC between customer and PC system circuitry
    • 500V/us common mode transient immunity
  • Input current range:
    • 4.0mA to 20.0mA for mark state
    • 0.0mA to 0.5mA for space state
  • Nominal input voltage range:
    • 1.51V @ 4mA to 2.05V @ 20mA for mark state
    • 0.0V to 1.10V @ 0.5mA for space state
  • Reverse input voltage limit:
    • 5.0V between pins 12 and 24
    • No reverse voltage protection
• Active transmitter circuit (pins 13 and 11):
  • 500VDC isolation between customer and PC system circuitry
  • Input current range:
    • 23.0mA max for mark state (load must exceed 300 ohms)
    • 0mA for space state
• Passive transmitter circuit (pins 11 and 18):
  • 500VDC isolation between customer and PC system circuitry
  • Device and power supply must float referenced to module ground
  • Input current range:
    • 55.0mA max. for mark state (max. voltage across pins 11 and 18 is 2.29, nominal is 1V@20mA)
    • 0mA for space state
  • 2.7V reverse voltage limit across pins 11 and 18