Schneider SR2A201BD Zelio Logic Smart Relay 20 I/O

Product Introduction

The Schneider Electric SR2A201BD belongs to the Zelio Logic family of compact smart relays. This versatile controller provides an all-in-one solution for small to medium-sized automation tasks. It integrates 12 discrete inputs, 8 relay outputs, and 2 analog inputs with 8-bit resolution. The built-in local display allows users to monitor system status and modify parameters directly. Furthermore, this unit supports ladder programming with up to 240 program lines.

Technical Specifications

The SR2A201BD delivers robust performance across various control applications.

Discrete Inputs:
This smart relay offers 12 discrete inputs conforming to IEC 61131-2 Type 1 standards. These inputs accept 24 V DC and draw 4 mA per channel. The input impedance varies by terminal group: 7.4 kOhm for I1...IA and IH...IR, and 12 kOhm for IB...IG. For state 1, the voltage must be at least 15 V, while state 0 requires 5 V or less. Moreover, the unit supports 3-wire PNP proximity sensors.

Analog Inputs:
The SR2A201BD includes 2 analog inputs with 8-bit resolution. These inputs accept 0...10 V or 0...24 V signals. The LSB value is 39 mV, and the conversion time matches the smart relay cycle time. At 25 °C, the conversion error is 5%, while at 55 °C, it reaches ±6.2%. The repeat accuracy at 55 °C is ±2%. Additionally, the maximum permissible voltage for these inputs is 30 V.

Relay Outputs:
This controller features 8 relay outputs with NO contacts. Each output handles up to 8 A thermal current. The switching capacity ranges from 10 mA at 12 V up to the full 8 A rating. For AC loads, the output voltage range is 24...250 V AC, while for DC loads, it is 5...30 V DC. The electrical durability reaches 500,000 cycles for various load types including AC-12, AC-15, DC-12, and DC-13.

Power Supply:
The Schneider Electric SR2A201BD operates on a 24 V DC supply with limits of 19.2...30 V. The maximum supply current is 100 mA without extension modules. Power dissipation is 6 W. This unit includes reverse polarity protection for added safety.

Programming and Performance

Programming Capabilities:
The SR2A201BD supports ladder programming with 0 to 240 control scheme lines. The cycle time ranges from 6 to 90 ms depending on program complexity. Users can program and monitor the unit via the local display or through connection tools like SR2USB01 or SR2BTC01.

Memory and Backup:
This smart relay features a program memory check on each power-up. It offers a backup time of 10 years at 25 °C. The clock drift is 12 minutes per year at 0...55 °C, or 6 seconds per month at 25 °C.

Response Times:
For relay outputs, the response time from state 0 to state 1 is 10 ms, and from state 1 to state 0 is 5 ms. The discrete inputs support counting frequencies up to 1 kHz.

Mechanical and Environmental Specifications

Mounting Options:
Users can mount the SR2A201BD onto a 35 mm DIN rail using the retractable lugs. Alternatively, they can fix it to a panel using screws. The local display faces front for easy viewing.

Environmental Limits:
This module operates in ambient temperatures from -20 to 40 °C in non-ventilated enclosures, or -20 to 55 °C in ventilated conditions. For storage, it withstands -40 to 70 °C. The relative humidity tolerance is 95% without condensation or dripping water. The operating altitude reaches up to 2000 m.

Protection and Certifications:
The Schneider Electric unit carries an IP20 protection rating for the terminal block and IP40 for the front panel. It complies with numerous standards including IEC 61131-2, IEC 61000-6-2, and IEC 61000-6-3. Product certifications include GOST, CSA, GL, and UL. Additionally, it meets EMC directive requirements and low voltage directive specifications.

Electromagnetic Compatibility:
This smart relay demonstrates robust immunity to electrostatic discharge (level 3), fast transients (level 3), and radiated fields. It also complies with class B radiated and conducted disturbance limits according to EN 55022-11 group 1.

Installation Guidelines

Proper installation ensures reliable operation of your Zelio Logic controller.

DIN Rail Mounting:
Secure the SR2A201BD onto a 35 mm DIN rail inside a control cabinet. Use the retractable lugs to lock it in place. Ensure adequate clearance for wiring and airflow.

Wiring Connections:
Use screw terminals for all connections. These terminals accept solid wires from 0.2 to 2.5 mm² (AWG 25...14) and flexible wires with cable ends from 0.25 to 2.5 mm² (AWG 24...14). For two-wire connections, use solid wires from 0.2 to 1.5 mm² or flexible wires from 0.25 to 0.75 mm². Apply a tightening torque of 0.5 N.m.

Power Supply Wiring:
Connect a 24 V DC power supply to the designated terminals. Install a 1 A quick-blow fuse or circuit-breaker in the power supply circuit for protection. The SR2A201BD includes reverse polarity protection to prevent damage from incorrect wiring.

Sensor Wiring:
For 3-wire PNP proximity sensors, follow the wiring diagram carefully. Use shielded cables for analog inputs to minimize noise interference. The maximum operating distance for analog sensors is 10 m with screened cable.

Packaging List

When you receive your Schneider Electric SR2A201BD, the package contains the following items:

• 1 x SR2A201BD Compact Smart Relay

• Removable screw terminal blocks for I/O connections

• Installation and wiring diagram guide

Note: Certificates and warranty documents do not come with the package. All orders ship via FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

Q1: What programming software does the SR2A201BD require?
A1: The SR2A201BD supports ladder programming directly through its local display. For PC-based programming, users need the Zelio Soft software and a connection cable like SR2USB01 or SR2BTC01.

Q2: Can I expand the I/O capacity of this smart relay?
A2: Yes. The Schneider Electric SR2A201BD supports extension modules. You can add up to 20 additional I/O points depending on the specific extension modules you choose.

Q3: What is the difference between the SR2A201BD and SR2A201FU?
A3: The SR2A201BD operates on 24 V DC power supply, while the SR2A201FU version runs on 100-240 V AC. Otherwise, their I/O configurations and features are identical.

Q4: Does this unit support real-time clock functions?
A4: No. This specific model, SR2A201BD, does not include a built-in clock. For applications requiring time-based scheduling, please consider the SR2B201BD or SR2C201BD models which include clock functionality.

Q5: What type of loads can the relay outputs switch?
A5: The relay outputs on the SR2A201BD switch both AC and DC loads. They handle resistive loads up to 8 A, inductive loads up to 0.9 A at 230 V AC, and DC loads up to 0.6 A at 24 V DC. For inductive DC loads, we recommend using a protection diode across the load to extend relay life.