TXM1.8RB SIEMENS

TXM1.8RB  SIEMENS Basis unit

Product  Description：

The TXM1.8RB is a specialized output module that features eight independent relay outputs. It is designed to be mounted on a standard DIN rail and communicates with the primary Desigo controller via the island bus. A defining characteristic of the "RB" variant is the inclusion of manual override switches with integrated LED status indicators on the front panel. This allows technicians to manually control each relay for testing, commissioning, or emergency override purposes without needing software intervention.

Product Parameters

• Supply Voltage: Powered via the island bus at 24 VDC.

• Number of Outputs: 8 digital relay outputs.

• Relay Type: Monostable changeover (Form C) or normally open contacts depending on configuration.

• Switching Voltage: Supports AC 24 V to 250 V or DC 5 V to 30 V.

• Switching Current: Maximum 5 A resistive or 2 A inductive per relay.

• Total Current Load: Maximum total current for the module is typically limited to 20 A across all relays to prevent overheating.

• Communication: Connected via the TX-I/O island bus for data exchange and power.

• Protection Class: IP20 protection according to EN 60529.

• Housing Material: High-grade plastic, usually RAL 7035 light gray.

• Mounting: Standard 35mm DIN rail.

Product Advantages

The TXM1.8RB offers significant operational benefits for complex building systems. The most prominent advantage is the Individual Manual Override, which simplifies troubleshooting by allowing local control of equipment like fans or pumps directly from the cabinet. The Status Feedback is immediate, as the LEDs provide clear visual confirmation of the relay state.

Its Compact Design allows for a high density of outputs in a small footprint, saving valuable space in control panels. Additionally, the Seamless Integration with the Siemens Desigo CC platform ensures that any manual intervention is reported back to the management station, maintaining transparency in system operations. The module is also hot-swappable when used with the appropriate base, reducing downtime during maintenance.

Important Considerations and Precautions

When installing and operating the TXM1.8RB, certain technical precautions are essential. First, ensure that the Total Current Limit is not exceeded; while individual relays can handle 5 A, the bus connector limits the total simultaneous load. Second, when switching Inductive Loads (such as motors or large contactors), appropriate RC snubbers or diodes should be installed to prevent electrical noise and prolong the life of the relay contacts.

Third, the manual override switches are intended for commissioning and emergency use; frequent manual switching under full load can lead to contact wear. Finally, always verify that the 24V Bus Power is stable and within the specified range, as voltage drops can lead to unreliable relay actuation or communication errors on the island bus.

Product Applications

The Siemens TXM1.8RB is widely used in commercial and industrial building automation projects.

• HVAC Control: Switching fans, pumps, and electric heating elements in air handling units (AHUs) and boiler rooms.

• Lighting Systems: Controlling banks of lights or individual circuits in offices and hallways via scheduled or sensor-based logic.

• Shading and Blinds: Managing the operation of motorized blinds or shutters in large-scale building facades.

• Equipment Interlocking: Providing hardware-level interlocks for safety sequences in industrial ventilation systems.

• Alarm Signaling: Actuating physical sirens, beacons, or relaying fault signals to third-party security or fire monitoring systems.

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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