Overview

The Loop and Bus Interface Modules (LIM/BIM) provide the principal communication interface between INFI 90 Process Control Units (PCU) and Plant Loop. Key features include:

• Plant Loop: A high-speed (500 kbaud) serial communication highway shared by all INFI 90 modules.
• Node Capacity: Supports up to 63 nodes in any combination on the loop.
• Compatibility: INLIM03 and INBIM02 are upward compatible with Network 90 NLIM02 and NBIM02.

Specifications

Memory

• LIM: 2 kbytes RAM, 4 kbytes ROM
• BIM: 32 kbytes RAM, 16 kbytes ROM

Power Requirements

• LIM:
  • +5 VDC @ 2.0 amps; 10 watts nominal
  • ±15 VDC @ 80 mA; 1.2 watts nominal
• BIM:
  • +5 VDC @ 1.0 amps; 5 watts nominal
  • +15 VDC @ 150 mA; 2.25 watts nominal
  • -15 VDC @ 120 mA; 1.80 watts nominal

System Capability

• Maximum of 63 nodes per system.
• Supports any combination of PCU, OIS, or NIU nodes.

Communication

• Rate: 500 kbaud
• Maximum throughput: 800 messages/second
• Synchronization time: 100 milliseconds maximum

Cable Specifications

• Plant Loop (node-to-node): 2000 meters (6561 feet) maximum
• Loop Interface (LIM-to-TPL/IPL): 61 meters (200 feet) maximum

Certification

• CSA Certified: For use as process control equipment in ordinary (non-hazardous) environments.

Environmental Specifications

• Ambient Temperature:
  • Operating range: 0°C to 70°C (32°F to 158°F)
• Relative Humidity:
  • Up to 55°C (131°F): 0% to 95% (non-condensing)
  • Up to 70°C (158°F): 0% to 45% (non-condensing)
• Atmospheric Pressure: Sea level to 3 km (1.86 miles)