8020-SCP-322

About the 8020-SCP-322

• Model Number: 8020-SCP-322.
• Manufacturer: Square D.
• Type: Model 300, 1K Deluxe Processor with RAM.

Processor Features

• Standard Processor Features (included in Deluxe):
  • BCD to binary and binary to BCD conversions.
  • Master control relay.
  • Synchronous shift registers.
  • Immediate I/O updates.
• Deluxe Processor Specific Features:
  • Asynchronous shift registers.
  • Four function math (add, subtract, multiply, divide).
  • Print function.
  • Communications.
• Communication Benefits: Allows communication with other SY/MAX family processors via a direct cable connection, without special interfacing hardware.

Processor Memory Utilization (Relay Circuits)

• Relay Circuits: Determine memory by counting contact coils and branches in each run.
  • Contact or Coil (including latches) and Address Number: 1 word of memory.
  • Spaces and Connects: Do not require words.
  • Branches: 1 word for each opening branch and 1 word for each closing branch.
• Special Instructions:
  • Timer: 4 words.
  • Counter: 5 words.
  • Data Register: 2 words.
• Rack Addressing:
  • Each rack assigned: 1 word of memory.
  • Each slot addressed: 1 word of memory.

Operational Behavior & Diagnostics

• Key Switch Changes:
  • When the key switch is moved from "DISABLE OUTPUTS" or "RUN" to any other position:
    • All programmed outputs are turned off.
    • The processor continues to scan user memory, setting outputs on or off according to the ladder diagram program.
• Internal Diagnostic Checks (Performed continuously):
  • Continuous check.
  • I/O image and status comparison.
  • Check of each word for proper parity.