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Chapter 1 Introduction
1.1 General Information
PCLD-8751 and PCLD-8761 are daughter boards that feature 48 isolated
digital I/O channels. PCLD-8751 is equipped with 48 opto-isolated digi-
tal input channels, while PCLD-8761 provides 24 isolated DI and 24
relay channels, which can be used by all Advantech TTL DI/O cards with
a 68-pin SCSI connector, like the PCI-1751 and PCI-1753 series.
In addition to on-board screw terminals for easy wiring, each channel is
equipped with an LED to indicate the status. If the input voltage level is
high or the output channel is activated, the LED will be lit, otherwise the
LED is off. You may configure the channels to work in either positive
logic mode or negative logic mode by setting the on-board jumpers.
1.2 Applications
• Digital signal sensing
• Switch status monitoring
• Limit switch monitoring
• Signal switching
• ON/OFF control
• Valve/solenoid control
• External high-power relay control
• Test automation
1.3 Features
• Works with Advantech TTL DIO cards equipped with 48 D/IO chan-
nels on SCSI 68-pin cable connectors
• 48 opto-Isolated digital input channels
• Detachable screw terminal for easy wiring
• LEDs indicate input logic status
• Inputs buffered with voltage comparators
PCLD-8751 & PCLD-8761 User Manual 2
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