The **RSR-01-R** is a specific electronic component commonly used in industrial automation, specifically within the category of **Relay Terminal Modules** or **Interface Modules**. It is typically manufactured by brands like **Samwon ACT** (under the IOLINK series). Below is a detailed breakdown of its electronic specifications and features. --- ### 1. General Overview The RSR-01-R is a **Single-Channel Relay Terminal**. Its primary purpose is to act as an interface between low-power control signals (from a PLC or Microcontroller) and high-power loads (motors, solenoids, or heaters), providing electrical isolation. ### 2. Technical Specifications | Feature | Specification | | :--- | :--- | | **Number of Channels** | 1 Channel | | **Relay Type** | Electromagnetic (typically plug-in type) | | **Input Voltage** | 24V DC (Standard) | | **Contact Arrangement** | 1c (SPDT - Single Pole Double Throw) | | **Contact Rating** | 250V AC / 10A or 30V DC / 10A | | **Mounting Type** | DIN Rail Mount (35mm) | | **Indicator** | LED Status Indicator (usually Red) | ### 3. Key Electronic Components #### A. The Relay (Heart of the module) The "R" in the suffix often denotes that the relay is **Removable** or replaceable. * **Isolation:** It provides galvanic isolation between the input (coil) and the output (contacts), protecting the PLC from voltage spikes. * **Switching:** It uses an electromagnetic coil to mechanically move a contact arm. #### B. Protection Circuitry * **Flyback Diode (Freewheeling Diode):** Connected across the relay coil to dissipate the back-EMF (voltage spike) generated when the coil is de-energized. This prevents damage to the driving transistor in the PLC. * **Varistor (Optional):** Some versions include a varistor on the contact side to suppress arcs during high-voltage switching. #### C. Visual Diagnostics * **LED Indicator:** A small SMD LED is wired in parallel with the coil. When the input signal is active, the LED lights up, allowing technicians to verify that the control signal is reaching the module. ### 4. Wiring and Terminal Layout The module typically features a screw-terminal block organized as follows: 1. **Input Terminals (Coil Side):** * **P (+):** Positive 24V DC signal. * **N (-):** Common/Ground. 2. **Output Terminals (Contact Side):** * **COM:** Common terminal. * **NO:** Normally Open (closes when powered). * **NC:** Normally Closed (opens when powered). --- ### 5. Application Advantages * **Space Saving:** Slim design allows for high-density mounting in electrical cabinets. * **Maintenance:** Since the relay is a plug-in type, if the contacts wear out, you can replace only the relay rather than the entire wiring block. * **Safety:** Ensures that high-voltage AC noise does not interfere with sensitive DC control logic.