Model 2402 Digital Output Baseplate Field Connections

Date: Mar 25, 2025 Views: 883

　　Pulse Input Module

　　The following pulse input components are available.

　　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

　　A typical gear has 30 to 120 teeth spaced at equal distances around its perimeter. The output frequency is proportional to the rotational speed of the shaft and the number of teeth.

　　CAUTION

　　A Pulse Input Module uses fully differential, input-signal-conditioning circuitry which is AC-coupled and has high bandwidth. The circuitry is designed for highfrequency operation with de-bounced edge detection, but is still sensitive to any type of waveform distortion that could result in erroneous measurements. The module counts transitions by examining one edge of each pulse. Therefore, ringing on the input signal can result in many additional transitions being counted. The module is capable of counting over 32,000 transitions per second.

　　The PI Module has three independent input channels. Each input channel:

　　• Receives pulse input voltages from each point

　　• Converts the values to frequency (RPM) data

　　• Transmits the values to the MPs on demand

　　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.

　　CAUTION

　　For critical control applications, we recommend using redundant sensors.

　　The PI Module sustains complete, on-going diagnostics for each channel. If the diagnostics detect a failure on any channel, the Fault indicator is activated, which in turn activates the system alarm. The Fault indicator points to a channel fault, not a complete module failure. The PI Module is guaranteed to operate properly in the presence of a single fault and may continue to operate properly with multiple faults.

　　The PI Module supports hot sparing for online replacement of a faulty module or continuous back-up to an active module. The PI Module is mechanically keyed to prevent improper installation in a configured baseplate.

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