ABB SC513 PLC Analog Input Module

ABB SC513 PLC Analog Input Module

Product Overview

ABB SC513 is a PLC analog input module designed for high-precision data acquisition in industrial processes. Its core positioning is the "signal sensing front-end" of control systems, focusing on converting continuous physical quantities such as temperature, pressure, and flow into digital signals that can be recognized by PLCs, achieving precise monitoring and data uploading of industrial parameters. It integrates advanced signal conditioning, anti-interference filtering, and multi protocol communication functions. It can be used as an independent I/O unit to adapt to the data acquisition needs of standalone devices, and can also be integrated into large control systems such as ABB Advant OCS and 800xA through bus expansion. It is a key sensing component in process industry, energy management, intelligent manufacturing, and other fields.

Compared to the SAFT110 module that focuses on safety signal processing, the SC513 focuses more on precise acquisition and transmission of industrial process parameters. Through 16 bit high-resolution conversion and wide range signal adaptation capabilities, it solves the problems of insufficient accuracy and weak anti-interference ability in traditional analog signal acquisition processes, providing reliable data support for closed-loop control and production optimization.

Specification parameters

（1） Core technical parameters

Collection performance

Supports 8 analog inputs (each independently configured), 16 bit resolution, conversion accuracy ± 0.1% FS

Signal adaptation

Compatible with voltage type (0~10V DC) and current type (4~20mA) signals, supporting PT100/PT1000 temperature signal access

Sampling characteristics

Single channel sampling rate up to 100Hz, channel switching time<1ms, supports synchronous/asynchronous sampling modes

Power supply parameters

24V DC wide power supply (18~32V DC), power consumption ≤ 12W, with reverse polarity protection and overcurrent protection (3A)

Environmental adaptability

Working temperature -20 ℃~+60 ℃, humidity 5%~95% RH (no condensation), protection level IP20

Anti-interference ability

Common mode rejection ratio (CMRR) ≥ 80dB, differential mode rejection ratio (DMRR) ≥ 60dB, in compliance with IEC 61000-4 standard

（2） System adaptation parameters

Communication protocol: Supports Ethernet, RS-485, compatible with Modbus RTU protocol, and can seamlessly integrate with ABB 800xA system

Signal isolation: The isolation voltage between input channels and between input and power supply should be ≥ 2.5kV AC (1min) to avoid signal crosstalk

Physical specifications: Dimensions 288mm × 22.5mm × 486mm, compatible with standard 35mm DIN rail installation, weight ≤ 0.67kg

Diagnosis and indication: Each channel is equipped with LED status indicator lights (green: normal; red: fault), which support uploading fault codes through the communication interface

Performance characteristics

High precision data acquisition: Using a 16 bit A/D conversion chip and calibration algorithm, the conversion accuracy reaches ± 0.1% FS. Combined with a high sampling rate of 100Hz, it can accurately capture subtle parameter changes such as pressure fluctuations and temperature gradients. The error in temperature monitoring of chemical reaction vessels can be controlled within ± 0.2 ℃.

Strong anti-interference ability: Through multi-stage filtering circuits and optoelectronic isolation technology, the common mode rejection ratio exceeds 80dB, which can effectively resist electromagnetic interference generated by industrial field frequency converters and motors. When used near steel mills, the signal fluctuation amplitude can be controlled below ± 0.05% FS.

Flexible signal adaptation: A single module can simultaneously access voltage, current, and thermistor signals, without the need for additional conversion modules to adapt to different types of devices such as pressure transmitters and temperature sensors. In water treatment systems, it can simultaneously collect liquid level (4-20mA), pH value (0-5V), and water temperature (PT100) signals, reducing system complexity.

Quick fault diagnosis: Real time monitoring of channel open circuit, short circuit, and signal over range faults, with a fault response time of less than 50ms. The fault information is synchronously output through LED indicator lights and communication interfaces, which can quickly locate damaged sensors or wiring problems and shorten downtime for troubleshooting.

Convenient system integration: Supports "plug and play" configuration, and channel signal types and ranges can be configured with one click through ABB dedicated software. The modular design is easy to expand, and a single PLC can expand up to 8 SC513 modules to meet the multi parameter acquisition needs of large production lines.

Working principle

Signal acquisition and conditioning: The analog signal output by the sensor (such as 4-20mA pressure signal) is input through the module wiring terminal, first suppressed by the surge protection circuit to suppress voltage surge, then converted into a voltage signal through a precision resistor, and then removed by a low-pass filter to eliminate high-frequency noise interference.

A/D conversion and data processing: The conditioned analog signal is sent to a 16 bit A/D converter and converted into a digital signal at a sampling rate of 100Hz. The CPU linearizes the data based on preset calibration parameters (such as range limits and sensor types) to correct system errors.

Data transmission and communication: The processed digital signal is transmitted to the upper PLC or control system through Ethernet or RS-485 interface, supporting Modbus RTU protocol for real-time data upload. In distributed systems, multi module synchronous acquisition can be achieved through bus, with a time deviation of less than 1ms

Fault monitoring and alarm: The CPU continuously compares the collected data with the preset threshold. When the signal exceeds the range, the circuit is open or short circuited, the fault flag is immediately triggered, the data output of the channel is cut off, and the red indicator light is lit. At the same time, the fault code (such as "CH2 open circuit") is uploaded to the control system to remind maintenance personnel to handle it.

Precautions

Installation specifications:

It needs to be installed in a control cabinet with an IP20 protection level, with a distance of ≥ 20cm from strong interference equipment such as high-power contactors and frequency converters. The analog wiring adopts twisted pair shielded wires, and the shielding layer is grounded at one end (grounding resistance ≤ 4 Ω) to avoid signal interference;

Module installation should reserve ≥ 5cm of upper and lower heat dissipation space. When the ambient temperature exceeds 50 ℃, forced air cooling should be configured to prevent a decrease in conversion accuracy caused by high temperatures.

Debugging points:

Before the first power on, it is necessary to check the power supply voltage (24V DC) and wiring polarity. It is strictly prohibited to connect AC power or reverse polarity, otherwise it will burn out the internal circuit of the module;

During debugging, it is necessary to calibrate each channel through configuration software, input standard signals (such as 12mA corresponding to 50% range), verify whether the deviation between the collected data and the standard value is within ± 0.1% FS, and test open and short circuit faults to confirm that the alarm function is normal.

Maintenance requirements:

Clean the wiring terminals and ventilation holes every 6 months, check if the grounding of the shielding wire is good, tighten loose wiring screws to prevent signal fluctuations caused by poor contact;

Perform accuracy calibration once a year, using a standard signal source to conduct full-scale testing on each channel. If the deviation exceeds ± 0.2% FS, recalibration is required to ensure acquisition accuracy.

Safety Warning:

Module maintenance must be operated by personnel with electrician qualifications. Before operation, the module power supply and sensor power supply must be cut off, and a "no operation" sign must be hung to prevent electric shock;

Do not plug or unplug wiring terminals or sensors while the module is powered on, and do not modify internal calibration parameters of the module, otherwise it may cause data distortion or module damage.