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3500 System Overview - page 3 / 12





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The TDI and RIM supply “self monitoring” functions both for themselves and for the rack, in addition to those provided by the individual monitor, relay, communications, and other modules. While the TDI and RIM provide certain functions common to the entire rack, neither is part of the critical monitoring path and has no effect on the proper, normal operation of the overall 3500 System or its machinery protection functions.

The TDI and RIM provide 4 front-panel LEDs as follows:


Indicates that the Rack Interface Module and its I/O modules are operating correctly.


Flashes at the rate that communications between the RIM and other rack modules are occurring.


Indicates when the rack is in the Trip Multiply mode.


Indicates that any module in the rack is not configured or has a configuration error; that the stored configuration of the Rack Interface Module does not match the physical configuration of the rack; or that a security option condition was not met.

System configuration is secured by means of a keylock switch on the front of the TDI/RIM and two levels of software password protection, preventing unauthorized changes to or tampering with the configuration. Both the TDI and the RIM can be connected to a portable computer via a front-panel serial communications port for local changes to configuration. The RIM can also be permanently connected to a configuration workstation via a rear panel serial communications port, or to a remote computer via an optional modem I/O module. The TDI provides permanent system connectivity via Ethernet ports. The TDI/RIM provides a front-panel DIP switch that permits the user to assign a unique rack address when multiple 3500 racks are networked with one another.

The TDI/RIM provides a system reset switch on the front panel, allowing the user to clear any latched alarms in the system as well as latched NOT OK conditions. An I/O module provides a set of rear- panel connections as well, allowing users to remotely activate this switch.

For Triple Modular Redundant (TMR) applications, the 3500 System requires a TMR version of the

TDI/RIM (refer to the TMR section of this datasheet for additional information).

Notes: 1. Dozens of possible event conditions within the rack can drive the NOT OK relay. For this reason, it is not intended for use as part of a machinery auto-shutdown circuit and should be used for general annunciation purposes only.


Table 1 summarizes available monitor types in the 3500 System. Each monitor occupies a single slot in the rack. All monitors are microprocessor-based and offer digitally adjustable Alert and Danger setpoints for each channel1. Users can configure alarms for latching or non-latching operation. Status indications for each monitor and channel are provided with bright, front-panel LEDs, allowing observation without operator interaction for easy and convenient operation. Most monitors provide independent 4 to 20 mA proportional outputs for each channel of the I/O module for connection to strip chart recorders or for older process control systems that do not support a digital interface. Where applicable, the monitor’s I/O modules provide transducers with appropriate power via short- circuit-protected terminals. OK detection routines within each monitor continuously check the integrity of each transducer and the associated field wiring.

Transducer input signals are buffered and sent to front-panel coaxial connectors2. Buffered output terminals are also available upon request on the rear of the TDI/RIM’s I/O module.

Specifications and Ordering Information Part Number 162096-01 Rev. F (03/07)

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