3500/20

3500/20 Rack Interface Module

The 3500/20 Rack Interface Module (RIM) serves as the primary interface to the 3500 rack, enabling configuration and retrieval of machinery information. It operates using a proprietary protocol and must be located in slot 1 of the rack, adjacent to the power supplies.

While the RIM provides essential functions for the rack, it is not part of the critical monitoring path and does not affect the normal operation of the monitoring system. One RIM is required per rack, and for Triple Modular Redundant (TMR) applications, a TMR version of the RIM is needed. This TMR RIM performs monitor channel comparison and implements monitor voting. It ensures that the information from the three redundant monitors remains within a configured tolerance. If one monitor deviates from the others, the TMR RIM flags the error and records an event in the System Event List.

Specifications

Inputs

• Power Consumption: 4.75 watts (typical)
• Data Front Panel:
  • Standard RS232 serial communications
  • Data Rate: 38.4 k baud
  • I/O Modules:
    • RS232/RS422 serial communications
    • Internal Modem Communications:
      • Data Rate: 38.4 k baud (serial)
      • 14.4 k baud (internal modem)

Outputs

• Front Panel LEDs:
  • OK LED: Indicates proper RIM operation
  • TX/RX LED: Indicates communication with other modules in the 3500 rack
  • TM LED: Indicates when the rack is in Trip Multiply
  • CONFIG OK LED: Indicates a valid rack configuration
• I/O Module OK Relay:
  • Indicates when the rack is functioning normally or if a fault is detected
  • User-selectable “OPEN” or “CLOSED” contact to annunciate a “NOT OK” condition
  • Relay Rating: 5A @ 24V DC/120V AC, 120W/600VA switched power
  • Arc Suppressors: Provided for relay contacts

Controls

• Front Panel Controls:
  • Rack Reset Button: Clears latched alarms and Timed OK Channel Defeat, same as “Rack Reset” contact on I/O module
  • Address Switch: Sets the rack address (up to 63 addresses)
  • Configuration Keylock:
    • RUN Mode: Normal operation, locks out configuration changes
    • PROGRAM Mode: Allows configuration changes (local or remote)
    • The key can be removed in either position, enabling remote configuration or restricting unauthorized changes
  • I/O Module System Contacts:
    • Trip Multiply: Places the rack in Trip Multiply
    • Alarm Inhibit: Inhibits all alarms in the rack
    • Rack Reset: Clears latched alarms and Timed OK Channel Defeat

Current Specifications

• Maximum Current: <1 mA DC, Dry Contact to Common

RS232/RS422 Switch (For RS232/RS422 I/O Module Only)

• Selects between RS232 and RS422 communications for Bently Nevada host software interaction

Learn more