Description

ABB GJR5253100R4278 07KT98 H3

I. Functional Positioning and Application Scenarios

Positioning

Typical Scenarios

• Continuous Production Control: Closed-loop processes such as temperature regulation of chemical reactors and flow control of petroleum pipelines.
• Equipment Logical Control: Start/stop sequences of pump groups in wastewater treatment plants and 联动 control of motors in food processing production lines.
• Data Acquisition and Monitoring: Collaborates with SCADA systems to achieve real-time collection and upload of field parameters (e.g., pressure, liquid level).

II. Functional Features

Processing Capacity and Memory

• Equipped with a 100MHz processor, supporting high-speed execution of PID algorithms and logical operations with a response time ≤5ms.
• Built-in 2MB program memory + 1MB data memory, capable of storing small to medium-sized control programs (such as single-variable control models) and historical data.

I/O Configuration and Signal Support

• Analog Input (AI): 8 channels, supporting 4-20mA, 0-10V, PT100 thermal resistors, with 12-bit accuracy.
• Analog Output (AO): 4 channels, outputting 4-20mA/0-10V, supporting loads ≤500Ω.
• Digital Input/Output (DI/DO): 8 channels each. DI for 24V DC level detection, DO for relay output (250V AC/2A).

Communication and Compatibility

• Standard with Ethernet, RS-232, RS-485 interfaces, supporting protocols like Modbus and Profinet.
• Supports cascading with host computers (e.g., ABB Freelance) and distributed I/O modules (e.g., 07DC series).

Reliability Design

• Wide-temperature operation: -40°C to +70°C, adapting to high-temperature (e.g., boiler rooms) or low-temperature (e.g., cold storage) environments.
• Electrical isolation: Isolation voltage ≥2500V AC between I/O channels and CPU, resistant to electromagnetic interference (complying with EN 61000 standards).
• Hot-swapping support: Enables module replacement during system operation to reduce downtime.

III. Technical Parameters

IV. Working Principle

Signal Processing Flow

• Input Stage: AI channels collect sensor signals (e.g., PT100 resistance from temperature sensors) and convert them into digital quantities; DI channels detect switch states (e.g., valve limits).
• Calculation Stage: The CPU processes data according to preset programs (e.g., PID algorithms) to generate control quantities (e.g., valve opening commands).
• Output Stage: AO outputs analog signals to drive actuators (e.g., control valves); DO controls relay actions (e.g., motor start/stop).

System Integration

• Communicates with host computers via Ethernet to upload real-time data (e.g., reactor pressure) and receive setpoint modification commands.
• Supports cascading distributed I/O modules (e.g., 07DC91) to expand I/O points up to 128.

V. Troubleshooting Guide

Communication Interruption

• Check if Ethernet/RS-485 cables are loose and whether the shield is well-grounded.
• Confirm that communication parameters (baud rate, IP address) match the host computer; restart the module or replace the interface chip.

Abnormal I/O Signals

• Large AI deviation: Measure sensor outputs (e.g., 4-20mA signals), check cables for short circuits/opens, and recalibrate channels.
• No DO output: Manually short DO terminals. If the actuator acts, the relay contacts are damaged, requiring module replacement.

Power Failure

• Measure the voltage at the power terminals to ensure it is within 20.4-27.6V DC; check if fuses are blown and replace the power module (if in redundant configuration).

VI. Typical Application Cases

Aeration Control in Small Wastewater Treatment Stations

• AI collects dissolved oxygen (DO) concentration; the CPU runs PID algorithms to generate AO signals (4-20mA) to adjust blower frequency; DI monitors aeration valve status; DO controls alarm lights (relays actuate when over-limit).

Speed Synchronization Control for Food Packaging Machines

• Communicates with frequency converters via RS-485; calculates conveyor speed based on encoder DI signals; AO outputs 0-10V signals to adjust motor speed, achieving multi-axis speed synchronization.

VII. Comparison with Similar Products (vs ABB 07CR41)