Schneider SR2A201FU Compact Smart Relay

Complete Technical Guide for Schneider SR2A201FU Compact Smart Relay

The Schneider SR2A201FU is a compact smart relay belonging to the Zelio Logic series. It integrates basic PLC functions with the advantages of relay control, and is suitable for logic control, remote management and monitoring of simple automation systems. The following is the complete technical parameters, functional features, application scenarios and model selection & replacement solutions.

Core Product Overview

Item	Parametru
Product Type	Compact Smart Relay
Serie	Zelio Logic SR2
Configurare I/O	12 discrete inputs + 8 ieșiri releu (20 I/O points in total)
Power Supply Voltage	100~240V AC, 50/60Hz
Display Function	Equipped with LCD screen and navigation buttons
Clock Function	No built-in real-time clock
Metoda de montare	35mm standard DIN rail mounting
Clasa de protectie	IP20 (front panel), IP40 (overall)
Temperatura de operare	-20℃ ~ +55℃
Temperatura de depozitare	-40℃ ~ +70℃
Warranty Period	18 months

Detailed Technical Parameters

(I) Input Characteristics

Parametru	Caietul de sarcini
Number of Input Points	12 discrete input points
Input Type	DC 24V (standard), compatible with NPN/PNP signals
Input Current	Approximately 7mA per point
Response Time	≤10ms
Isolation Method	Photoelectric isolation, 2500V AC

(II) Output Characteristics

Parametru	Caietul de sarcini
Number of Output Points	8 relay output points
Contact Type	Deschis normal (NU), C-type contacts (opțional)
Curent nominal	Maximum 8A per point, for AC-1 category loads
Tensiune nominală	Maximum 250V AC / 30În DC
Mechanical Service Life	≥10 million operations
Electrical Service Life	≥100,000 operations (at rated load)
Surge Protection	Built-in RC snubber circuit

(III) Funcții de control

Function	Caietul de sarcini
Programming Method	Ladder Diagram, supports 0~240 logic lines
Built-in Function Blocks	16 timers, 16 counters, shift registers, comparators, etc.
Memory	Built-in EEPROM flash memory, data retention up to 10 ani
Communication Interface	Supports USB/Bluetooth communication expansion via SR2USB01 or SR2BTC01 module
Program Capacity	Can store multiple programs, supports program copying to other SR2 relays

III. Core Functional Features

Integrated Design: Integrates PLC logic control and relay output, meeting small-to-medium-sized control requirements without additional expansion modules.
Easy Programming: Supports ladder diagram programming. On-site editing, monitoring and fault diagnosis can be performed via the built-in LCD screen and navigation buttons, eliminating the need for a dedicated programmer.
Flexible Adaptability: Wide voltage power supply (100~240V AC) is compatible with power grids worldwide, and DC 24V input is compatible with industrial sensor signals.
Reliable and Durable: Industrial-grade design with strong anti-electromagnetic interference capability, suitable for harsh industrial environments.
Data Security: Built-in EEPROM memory ensures no program or data loss after power failure, with a backup cycle of up to 10 ani.
Cost Optimization: Replaces traditional relay control cabinets, reduces wiring complexity, and lowers maintenance costs and potential fault points.
Scenarii tipice de aplicare
Controlul motorului: Start-stop, forward-reverse rotation, star-delta reduced-voltage starting and other self-locking and interlocking control for single/three-phase motors.
Pump and Valve Systems: Logic control and protection for water supply and drainage, hydraulic and pneumatic systems.
HVAC Control: Interlocking control of temperature/pressure/flow for fans, compressors and air conditioning systems.
Lighting Management: Timed lighting, zoning control and energy-saving management for industrial plants and commercial buildings.
Equipment Interlocking: Sequence control, counting, time delay and interlocking protection for simple processes in production lines.
Remote Monitoring: Realize remote monitoring and control of equipment operating status through communication modules.
Programming and Commissioning Methods
On-site Programming: Directly perform logic editing, parameter setting and fault diagnosis via the built-in LCD screen and navigation buttons.
Software Programming: Use the Zelio Soft dedicated programming software (including Discovery Package learning version), which supports ladder diagram editing, simulation and program upload/download.
Communication Expansion:

SR2USB01: USB communication module, enabling high-speed data transmission between PC and relay.

SR2BTC01: Bluetooth communication module, supporting wireless programming and monitoring.

Fault Diagnosis: The LCD screen displays real-time I/O status, timer/counter values and fault codes, facilitating quick problem location.
Model Selection, Replacement and Cross-brand Alternatives

(I) Schneider Same-series Alternatives

Model	Differences	Scenarii de aplicare
SR2A101FU	No LCD screen	Cost-sensitive fixed control scenarios that do not require on-site programming
SR2A201FW	With real-time clock	Applications requiring timing control and time recording
SR2B201FU	8 inputs + 4 ieșiri releu	Scenarios with fewer I/O point requirements
SR2B201FW	8 inputs + 4 ieșiri releu + clock	Simple timing control scenarios

(II) Cross-brand Alternative Solutions

Marca	Model	Compatibilitate	Remarks
Chint	NX-SR Series Smart Relays	★★★☆☆	Similar functions, I/O points need to be matched accordingly
Delicios	CDSR Series	★★★☆☆	Compatible with basic logic control functions
Omron	CP1E Series Micro PLC	★★★★☆	More abundant functions, programming software needs to be adapted
Siemens	LOGO! Serie	★★★★☆	Same type of compact smart relay with different communication protocols

VII. Installation and Wiring Key Points

Installation Location: Mount on 35mm standard DIN rail, reserve ≥50mm heat dissipation space, and avoid high temperature, humidity, dust and strong electromagnetic interference environments.
Power Supply Wiring: Connect L/N to 100~240V AC power supply, and ensure the PE terminal is reliably grounded.
Input Wiring:

Connect the common terminal (COM) to the negative pole of DC 24V.

Connect input points to the positive pole of sensor signals, with a response time ≤10ms.

Output Wiring:

The common terminal (COM) of relay outputs can be connected to AC 220V or DC 24V power supply.

Maximum load of 8A per point; for inductive loads, a freewheeling diode (DC) or RC snubber circuit (AC) must be connected in parallel.

Communication Wiring: Realize USB/Bluetooth communication through expansion modules, with communication cable length ≤5m.

VIII. Common Fault Troubleshooting

Fault Phenomenon	Possible Causes	Troubleshooting Methods
Power indicator not lit	Poor power connection/abnormal voltage/damaged power module	Check power wiring and voltage, replace the power module
No input response	Abnormal input signal/wiring error/damaged input point	Measure input signal, check wiring, replace the input point
No output action	Damaged output point/load short circuit/logic error	Check load and wiring, simulate and test logic with Zelio Soft
Program loss	EEPROM fault/abnormal power failure	Check power stability, re-download the program
Communication failure	Poor connection of communication module/incorrect software settings	Check module connection, confirm communication parameter matching

Safety and Maintenance Suggestions
Safe Operation: Programming and wiring must be performed under power-off conditions to avoid electric shock risks.
Regular Maintenance:

Inspect wiring terminals for looseness and clean dust on the equipment surface every quarter.

Test I/O point response and relay contact reliability every year.

Program Backup: Regularly back up programs via Zelio Soft software to prevent data loss.
Spare Parts Reserve: It is recommended to reserve spare relays of the same model for critical applications to shorten fault downtime.