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  • ABB SPDSM04 Pulse Input Module
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  • ABB SPDSM04 Pulse Input Module

    110V-380V
    5W-130W
    1A-30A
    1 year
    30
    United States, France, Japan, Viet Nam, Australia, Russia, Germany, Italy, Arabia
    SPDSM04 Pulse Input Module
    • ¥3244.00
      ¥9962.00
      ¥3244.00
      ¥3244.00
    • Satisfaction:

      Sales: 0

      Review: 0

    Weight:2.000KG
    • Quantity:
    • (Inventory: 2)
Description
SPDSM04 Pulse Input Module

ABB SPDSM04 Pulse Input Module

Overview

Product Definition and Function: The ABB SPDSM04 Pulse Input Module is a device used in industrial automation systems whose main function is to receive and process pulse signals. In industrial environments, pulse signals can come from a variety of sensors and devices, such as encoders, flow meters, proximity switches, and so on. The module is able to accurately capture these pulses and convert them into digital information for further analysis and processing by the control system (e.g. PLC, DCS), such as calculating speed, flow, position and other parameters.

Working Principle

Signal reception and filtering:

Input interfaces and signal types: The SPDSM04 module has several pulse input interfaces that are capable of receiving different types of pulse signals. These include digital pulses, such as A-phase and B-phase pulses from a rotary encoder, which are used to measure the angle, speed and direction of a rotating device, as well as pulses from a flow sensor, whose frequency is proportional to the flow rate. Signal level standards typically support TTL (Transistor-Transistor Logic) levels (typically 2V - 5V high and 0V - 0.8V low) and CMOS (Complementary Metal-Oxide-Semiconductor) levels (specific ranges depending on the device).

Signal Filtering: When a pulsed signal enters the module, it is first filtered. There are various electromagnetic interferences in the industrial field, which may cause jitter or noise in the pulsed signal. Through filtering circuits, such as a combination of low-pass filters, high-pass filters or band-pass filters, high-frequency noise and low-frequency interference in the signal can be removed, making the pulse signal cleaner and more stable. For example, for environments with severe high-frequency noise interference, a low-pass filter can effectively block signal components above a certain frequency, ensuring the accuracy of the pulse signal.

Pulse counting and processing:

Counter working principle: The filtered pulse signal enters the pulse counter. The counter inside the module works on the principle of digital circuitry and is capable of counting the rising or falling edges of pulses. For example, for a simple rotary encoder signal, each rising edge of a pulse represents the encoder turning through a certain angle and the counter records the number of these pulses. The number of bits in the counter determines the range it is capable of counting. Generally speaking, the SPDSM04 module has a high number of bits in the counter to meet the counting needs of most industrial applications, for example, it can be a 16-bit or 32-bit counter capable of counting a range from 0 to 65535 or 0 to 4294967295 pulses.

Frequency Measurement and Cycle Counting: In addition to counting, the modules can also perform frequency measurement and pulse cycle counting. By recording the number of pulses received within a certain period of time, or by measuring the time interval between two neighbouring pulses, the frequency and period of the pulse signal can be calculated. For example, in flow measurement applications, the flow rate can be calculated based on the frequency of the pulses from the flow sensor; in speed measurement applications, the speed of a rotating device can be calculated by measuring the period of the encoder pulses.

Data output and communication:

Data format and output interface: The processed pulse count data, frequency data or period data are sent to the control system in the form of digital quantities via the output interface. The data format can be binary, BCD code (binary - decimal code), etc., depending on the module settings and control system requirements. Output interfaces usually include parallel and serial interfaces. Parallel interfaces can transmit multiple bits of data at the same time, which is faster, but with more wires; serial interfaces transmit data bit by bit, with fewer wires, but the transmission speed may be relatively slow. For example, the module can send data to a host control system via an RS-485 serial interface using a specific communication protocol, such as Modbus.

Communication Protocols and Data Transfer: To ensure accurate data transfer and system compatibility, the SPDSM04 module supports a variety of industrial communication protocols. In addition to the Modbus protocol mentioned above, protocols such as Profibus - DP may also be supported. When using a communication protocol for data transmission, the module packages the data into data frames and sends them to the receiver according to the format and rules specified in the protocol. The receiver (e.g. PLC or DCS) parses the data frame according to the protocol and obtains information such as pulse counts, frequencies, etc. for subsequent control and processing operations.

Performance features

High-precision signal acquisition: It can accurately acquire pulse signals and count pulses with high precision. Under normal operating conditions, the counting error is extremely low, for example, the counting accuracy can reach ±1 pulse, which is very important for industrial applications that need to accurately measure parameters such as position, flow, speed, etc., to ensure the accuracy of the measurement results.

Wide frequency range adaptability: it can adapt to a wide range of pulse frequencies, and can receive pulse signals from a few Hz to tens of kilohertz. For example, its frequency reception range can be 0.1Hz - 50kHz, such a wide frequency range makes it can be applied to a variety of different types of sensors and equipment, whether it is a low-speed operation of the mechanical device or high-speed rotation of the motor, are able to effectively collect pulse signals.

High anti-interference ability: due to the complex environment of industrial sites, there are various electromagnetic interference, SPDSM04 module has a strong anti-interference ability through good filter circuit design and electromagnetic compatibility (EMC) measures. It can work stably in the environment of strong electromagnetic interference to ensure the accurate acquisition and processing of pulse signals. For example, it can still reliably receive and process pulse signals in environments where a large amount of electromagnetic interference is generated by motors, inverters and other equipment.

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