850AN00059B EATON

850AN00059B EATON Relay Input Module

Product  Description：

A Relay Input Module serves as the interface between high-voltage or high-current external signals (inputs) from devices like limit switches, pushbuttons, or proximity sensors, and the low-voltage internal logic circuit of the controller. The "relay" designation means this module uses electro-mechanical relays or sometimes solid-state relays internally to perform the necessary electrical isolation. The input signal from the field device energizes a coil within the module, which then closes a physical contact to provide a clean, isolated signal to the controller’s backplane. This isolation is crucial for protecting the sensitive electronic components of the control system from electrical noise, surges, and ground loops that may originate from the field devices. It is modular and designed to mount on a DIN rail, connecting to the main CPU via a bus connector.

Product Parameters

The specific parameters depend on the module series (e.g., easyE4 expansion modules, XV series I/O), but key specifications include:

• Number of Inputs: Typically available in configurations of $4$, $8$, or $16$ input points per module.

• Input Voltage Range: Wide ranges are common, such as $100$ to $240 \text{ V}_{\text{AC}}$ or $12$ to $24 \text{ V}_{\text{DC}}$ (DC inputs often accept both $12$ and $24 \text{ V}_{\text{DC}}$).

• Isolation Voltage: The electrical separation rating between the input terminals and the control logic, often rated in thousands of volts (e.g., $2500 \text{ V}_{\text{RMS}}$).

• Input Current: The minimum current required to reliably energize the internal relay (typically in the milliamp range).

• Response Time: The time delay between the input signal change and the controller detecting the change, usually in milliseconds.

• Connection Type: Screw terminals or push-in spring terminals are standard for wiring field devices.

• Housing/Mounting: Designed for DIN rail mounting in industrial cabinets with an ingress protection rating typically around IP20.

Product Advantages

The primary benefit of a Relay Input Module is superior electrical isolation, which effectively separates the potentially noisy or high-voltage field wiring from the delicate internal electronics of the controller, enhancing system robustness. It offers versatility by handling a wide range of $AC$ and $DC$ voltages, making it compatible with many different types of field sensors and devices in mixed-voltage environments. The use of robust electro-mechanical relays provides a long mechanical lifespan and resilience against transient voltage spikes. Furthermore, its modular design allows users to easily expand the number of inputs in the system as required, providing scalability without replacing the entire controller.

Important Considerations (Precautions)

When installing and operating the Relay Input Module, users must observe several precautions. Always ensure the input signal voltage is within the module's specified range to prevent damage to the internal relay coil. Proper wiring practices are essential, including appropriate conductor sizing and following the manufacturer's specified terminal torque for screw connections to maintain reliable contact. It is crucial to ensure proper grounding and shielding of the input wiring to minimize electromagnetic interference (EMI) which could lead to spurious or false signals being detected. Since the module uses a physical relay, its switching speed is inherently slower than a solid-state (transistor) input module, so it is unsuitable for high-speed counting or very time-critical applications.

Product Applications

EATON Relay Input Modules are widely used in industrial and commercial environments where reliability and electrical isolation are paramount. They are commonly employed in general machine control for monitoring the status of safety gates, start/stop buttons, and end-of-travel limit switches. They are crucial in building and facility automation, monitoring inputs from fire alarms, security sensors, and traditional mechanical switches. In power distribution and utility applications, they can monitor the status of circuit breakers and disconnect switches. Essentially, any application requiring the controller to reliably read the state of external binary devices, especially those operating at higher or different voltages than the controller logic, is an ideal fit.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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