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• Interrupt handling
• Interrupt output pin for simultaneously triggering external devices
with the interrupt
• High density SCSI 68-pin connector
• Output status readback
• Two 16-bit timers can be cascaded to one 32-bit timer, and can
generate watchdog timer interrupts
• One 16-bit event counter can generate event interrupts
• Keeps port I/O settings and digital output states after hot system
reset
• Supports dry contact and wet contact
A p p l i c a t i o n s
• Industrial AC/DC I/O devices monitoring and control
• Relay and switch monitoring and control
• Parallel data transfer
• Sensing the signals of TTL, DTL, CMOS logic
• Driving indicator LEDs
Sp e c i f i c a t i o n s
I/O channels: 48 digital I/O lines
Programming mode: 8255 PPI mode 0
In p u t Si g n a l
• Logic high voltage: 2.0 to 5.25 V
• Logic low voltage: 0.0 to 0.80 V
• High level input current: 20 µA
• Low level input current: -0.2 mA
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Chapter 1 General Information
3
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