Each TMR Pulse Input Module has three isolated sets of electronics, called channels, which independently receive voltage transitions from each point and converts the transitions to frequency (RPM) data. Each channel places the processed data in an array and transmits the array, on request, to the MP associated with that channel. The MPs vote the data before passing it to the application

The six sensitive, high-frequency inputs can be individually configured for non-amplified and amplified magnetic speed sensors which are common on rotating equipment, such as turbines or compressors. The module is capable of counting over 32,000 transitions per second.

The PI Module senses voltage transitions from the speed sensors, samples every input transition, and measures time to optimize the number of input gear pulses. To ensure correct data for each scan, one value is selected using a mid-value selection algorithm. Sensing of each input point is designed to prevent a single failure on one channel from affecting another channel. The resulting count and time are used to generate a frequency (revolutions per minute), which is transmitted to the Main Processors.

The type of speed sensor typically used with the PI Module consists of an inductive coil and rotating teeth. The sensor is physically close to the teeth of a gear on the rotating shaft. The output frequency is proportional to the rotational speed of the shaft and the number of teeth. As the teeth move past the sensor, the resulting change in the magnetic field causes a sinusoidal signal to be induced in the sensor.

Although the circuitry is designed for high-frequency operation with debounced edge detection, it is sensitive to any type of waveform distortion that could result in erroneous measurements. Consequently, ringing on the input signal can result in many additional transitions being counted.

PI Modules include complete, ongoing diagnostics for each channel. If the diagnostics detect a failure on any channel, the Fault indicator turns on and activates the system alarm. The Fault indicator identifies a channel fault, not a complete module failure. PI Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.

PI Modules support hot-spare modules. Each PI Module is mechanically keyed to prevent improper installation in a configured baseplate.

The Model 3381 PI Module is compatible with the Model 2381 PI Baseplate.

Solid-State Relay Output Module

Each Solid-State Relay Output Module has three isolated sets of electronics, called channels, which independently accept data from the MP associated with each channel. The channels provide input to a voter circuit which uses the voted value to drive the coil of the relay. The output portion of this module is Simplex.The SRO Module is a non-triplicated module for use on non-critical points which are not compatible with highside, solid-state output switches; for example, interfacing with annunciator panels.

The SRO Module receives output signals from the MPs on each of three channels. The three sets of signals are voted and the voted data is used to drive the 32 individual relays. Each output has a loop-back circuit which verifies the operation of each relay switch independently of the presence of a load. Ongoing diagnostics test the operational status of the SRO Module.

SRO Modules include complete, ongoing diagnostics for each channel. If the diagnostics detect a failure on any channel, the Fault indicator turns on and activates the system alarm. The Fault indicator identifies a channel fault, not a complete module failure. SRO Modules are guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.

SRO Modules support a hot-spare module. Each SRO Module is mechanically keyed to prevent improper installation in a configured baseplate.

The Model 3451 SRO Module is compatible with the Model 2451 SRO Baseplate.

I/O Extender Module Kits

I/O Extender Module Kits are used to:

• Carry I/O messages from one I/O column to another

• Provide logic power terminals for each I/O column

You must connect 24 volt logic power sources to every I/O column by using an I/O Extender Module or an MP Baseplate.

Each I/O Extender Module Kit includes:

• Two I/O Extender Modules

• Three two-foot I/O Bus Cables

• One I/O or MP Interconnect Assembly

The main components on an I/O Extender Module are:

• Two 24-volt logic power input terminal blocks, each with fuse and blown-fuse indicators

• A protective earth (safety ground) terminal

• Three DB-9-pin I/O bus connectors, one per channel

In a typical Trident system, a maximum of eight baseplates may be connected end-to-end in an I/O column. To extend a system beyond eight baseplates or to distribute the baseplates into multiple I/O columns, I/O Extender Modules and I/O Bus Cables are used, as shown on the figure at the right.

I/O Bus Cables

An I/O bus cable is required for each TMR channel and is terminated at each end by a male DB-9-pin connector. Various cable lengths are available.

If the I/O bus is longer than 20 feet (6 meters), the bus should be terminated by adding an I/O Bus Terminator Kit to both open ends of the system. The maximum allowable I/O bus length is 650 feet (200 meters).
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