TRICONEX 3381 Pulse Input Module

Description

Analog Input 3351 3 4 Negligible
Analog Output 3481 3 3 Negligible
Analog Output 34823 7 Negligible
Communication 3201 8 Not applicable Not applicable
Digital Input 3301 3 7 Negligible
Digital Output 3401 3 4 Negligible
Main Processor 3101 82
2. Without MAUs
Not applicable Not applicable
Pulse Input 3381 3 Negligible Negligible
Solid-State
Relay Output
3451 3 4

3381 Pulse Input Module 0.5 Hz–32 kHz Commoned
2381 Pulse Input Baseplate Direct Termination

The Pulse Input (PI) Module provides six very sensitive, high-frequency inputs.
The inputs can be individually configured for non-amplified and amplified
magnetic speed sensors common on rotating equipment, such as turbines or
compressors. The PI Module senses voltage transitions from the speed sensors.
Every input transition is sampled, and time is measured for an optimized number
of input gear pulses. 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. As the shaft rotates and the teeth move past the sensor, the resulting
change in the magnetic field causes a sinusoidal signal to be induced in the sensor.
The magnitude of the output voltage depends on:
• How fast the teeth pass the sensor
• The distance between the sensor and the teeth
• The construction of the sensor

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