Overview

The Loop Interface Module (LIM) and Bus Interface Module (BIM) serve as key communication interfaces in the INFI 90 distributed control system, connecting Process Control Units (PCU) to the Plant Loop network. The Plant Loop is a high-speed serial communication highway with a data rate of 500 kbaud, supporting up to 63 nodes in various combinations of PCUs, Operator Interface Stations (OIS), or Network Interface Units (NIU). Both the INLIM03 and INBIM02 modules are fully upward compatible with the older Network 90 models NLIM02 and NBIM02.

Specifications

Memory

• 32 kbytes RAM
• 16 kbytes ROM

Power Requirements

• +5 VDC @ 1.0 A (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, consisting of any combination of PCUs, OISs, and NIUs.

Communication Rates

• 500 kbaud transmission speed
• Up to 800 messages per second

Synchronization Time

• 100 milliseconds maximum

Certification

• CSA certified for use as process control equipment in ordinary, non-hazardous environments.

Environmental Conditions

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