Features

• High-density 144-CH digital inputs/outputs (ACL-7122.)
• 48-CH digital inputs/outputs with a timer (PET-48DIO)
• TTL/DTL compatible digital I/O channels
• Direct interface with OPTO-22 compatible I/O modules
• Emulates industry standard 8255 PPI (mode 0)
• Buffered circuits for high driving capacity
• Output status read back
• Programmable interrupt handling

Introduction

The ACL-7122/ PET-48DIO is a 144/48-CH high-density parallel digital I/O board for ISA bus. This board provides 6/2 sets of 24-CH I/O interface. Every 24-CH interface emulates mode 0 of the industry standard 8255 Programmable Peripheral Interface (PPI) chips, each offers three 8-bit ports: PA, PB, and PC. PC is subdivided into 2 nibble-wide (4-bit) ports. Each PPI channel has an individual connector with OPTO-22 pin assignment.