TXM1.8RB SIEMENS 8 Relay Output Module

Description

TXM1.8RB SIEMENS 8 Relay Output Module

Product Dimensions：

Product Description (Detailed Explanation)

The TXM1.8RB features 8 independent, bistable relay outputs. Unlike standard monostable relays that require constant power to stay energized, bistable (latching) relays only require a pulse to change state. This means the outputs maintain their current switching state even in the event of a power failure or a restart of the automation station (e.g., PXC100-E.D).

Each output is a volt-free (dry) contact, allowing for the switching of various voltages. The module communicates with the controller via the TX-I/O island bus and is mounted on a standard DIN rail using a bus connection terminal base.

Product Parameters (Technical Specifications)

Product Advantages (Key Benefits)

• State Retention: The “Bistable” nature ensures that critical equipment (like fans or lights) does not change state if the control system loses power, preventing unexpected system behavior.

• Energy Efficiency: Because the relays only consume power during the switching transition, the module generates very little heat and reduces overall bus power load.

• Flexible Switching: Each channel is independent and volt-free, allowing you to switch different phases or voltages (e.g., 24V and 230V) on the same module.

• Hot-Swappable: The electronic module can be replaced without disconnecting the field wiring or interrupting the bus communication to other modules.

• High Inrush Tolerance: Designed to handle the high initial current typical of fluorescent lighting or small motor starters.

Precautions (Important Notes)

• Manual Override Lack: Unlike the “-M” versions, the 8RB does not have manual override switches on the front panel. All switching must be done via software.

• External Fusing: All relay outputs must be protected by external circuit breakers or fuses (Max. 10A) to prevent permanent damage from short circuits.

• Mixed Voltages: If switching different voltages (e.g., SELV 24V and 230V AC), ensure that the wiring and terminal layout comply with local safety standards regarding clearance and isolation.

• Terminal Base Requirement: This module requires a TXS1.BP (or equivalent) terminal base to connect to the TX-I/O bus and field wires.

Product Applications (Typical Use Cases)

• Lighting Control: Managing large groups of lamps or ballasts where state retention during power blips is required.

• Fan & Pump Control: Enabling or disabling starters for HVAC equipment (Supply Fans, Exhaust Fans).

• Interlocking Circuits: Providing dry contact signals to fire alarm systems, elevators, or security panels.

• Heating/Cooling Stages: Controlling electric heaters or multi-stage cooling units.

• General Load Switching: Any application requiring a robust interface between low-voltage control logic and line-voltage power loads.

Shipping Port: Xiamen, 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

Please make an inquiry for more models：