The Siemens 549-214 expansion module extends the I/O capacity of compatible PLC and control systems. This compact unit adds both digital inputs and outputs to existing configurations. The module connects through a standard backplane or ribbon cable interface.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Digital I/O expansion module |
| Digital Inputs | 8 x 24V DC (sink/source configurable) |
| Digital Outputs | 8 x 24V DC / 0.5A (transistor) |
| Total I/O Count | 16 channels |
| Dimensions (W x H x D) | 120 x 90 x 40 mm |
| Weight | 0.35 kg |
| Input Voltage Range | 20.4V – 28.8V DC |
| Input Current | 5 mA per channel (typical) |
| Output Current | 0.5A per channel (continuous) |
| Output Protection | Short-circuit, overcurrent (1A limit) |
| Switching Frequency | 100 Hz (resistive load) |
| Isolation | 500V DC (between field and logic) |
| Internal Components | 2 x optocoupler ICs, 1 x driver array, 1 x voltage regulator |
| Connector Type | 20-pin ribbon cable (IDC) |
| Status Indicators | 16 x LED (green for active channels) |
| Power Supply | 24V DC (from backplane or external) |
| Power Consumption | 5V DC / 50 mA, 24V DC / 100 mA |
| Operating Temperature | 0°C to +55°C |
| Mounting | DIN rail (top-hat 35mm) |
| Approvals | CE, UL, cULus |
Flexible Digital Input Configuration
The Siemens 549-214 provides eight digital inputs that accept 24V DC signals from various field devices. Users can configure each input as sink or source to match sensor wiring requirements. Each input draws only 5 mA and responds to signals within the 20.4V to 28.8V range. LED indicators on the front panel show the active status of every input channel.
Reliable Transistor Outputs for Load Control
Eight transistor outputs deliver 0.5A per channel for driving small loads directly. These outputs switch resistive loads at frequencies up to 100 Hz for pulse-width modulation applications. Integrated short-circuit and overcurrent protection limit each output to 1A maximum. Output status LEDs provide immediate visual confirmation of switching operations.
Compact Mechanical Design and Easy Installation
The module measures only 120 x 90 x 40 mm and weighs 0.35 kg for space-efficient mounting. A 20-pin IDC ribbon cable connector provides the interface to the host controller. The unit clips onto standard 35mm top-hat DIN rails without requiring tools. Status LEDs across the front panel give operators a quick overview of channel states.
Galvanic Isolation for Noise Immunity
Galvanic isolation of 500V DC separates the field wiring from the internal logic circuits. This isolation protects the control system from electrical noise and transient voltages. Two optocoupler ICs provide the isolation barrier for input signals. The driver array handles output switching while maintaining the isolation integrity.
Low Power Consumption and Thermal Performance
The Siemens 549-214 draws only 50 mA from the 5V DC supply and 100 mA from the 24V DC supply. This low power draw keeps heat generation minimal within control cabinets. An internal voltage regulator ensures stable operation despite fluctuations in the supply voltage. The module operates reliably across a 0°C to +55°C ambient temperature range.
Details
| Weight | 1.2 kg |
|---|---|
| Dimensions | 50 × 290 × 217 mm |
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