ALSTOM NRD108031 TRVC070999000 BOTTOM

Input Voltage: 24VDC ±10% (some models support redundant power input)

Power Consumption: Typical 5W, Max 8W

Inrush Current: ≤1.5A (during cold start)

Channels: 8-16

Output Type: Relay (dry contact, rated current 5A) or transistor (24VDC/0.5A)

Switching Frequency: Relay ≤10Hz, Transistor ≤1kHz

Channels: 2-4

Output Range: Configurable for 0-10V, 4-20mA, etc.

Resolution: 12-bit

Accuracy: ±0.5% FS

Load Capacity: ≥500Ω (current output), ≤1kΩ (voltage output)

Channels: 8-16

Input Type: Dry/Wet contacts (rated voltage 24VDC)

Response Time: ≤1ms

Channels: Typically 4-8 (depending on the model)

Input Range: Configurable for ±10V, ±20mA, 0-20mA, 4-20mA, etc.

Resolution: 16-bit or higher

Accuracy: ±0.1% FS (Full Scale)

Sampling Rate: Up to 1kHz (multichannel time-division multiplexing)

Analog Input (AI)

Digital Input (DI)

Analog Output (AO)

Digital Output (DO)

Ports: 1-2 RS-232/485 ports

Speed: Configurable from 300 to 115200bps

Protocols: Modbus RTU, DNP3, ASCII

Ports: 2 RJ45 ports (supporting ring network redundancy)

Speed: 10/100Mbps auto-negotiation

Protocols: Modbus TCP/IP, Ethernet/IP, Profinet (depending on firmware version)

Ethernet

Serial Port

Concurrent Connections: Up to 32 (depending on protocol type)

Data Transfer Rate: Typical 100ms/cycle (depending on network load)

Ring Network Self-Healing Time: ≤300ms (DLR topology)

Type: ARM Cortex-M4 or higher

Clock Speed: ≥100MHz

Built-in Resources: Timers, PWM controllers, watchdog

RAM: ≥128KB (for program execution)

Flash: ≥1MB (for firmware storage and data logging)

Operating Temperature: -20°C to +60°C (standard model)

Storage Temperature: -40°C to +85°C

Relative Humidity: 5%-95% (non-condensing)

Analog Input: Receives analog signals (e.g., 4-20mA, 0-10V) from sensors (current, voltage, temperature) via dedicated channels, converting them to digital values through an internal ADC with 12-16-bit precision.

Digital Input: Acquires switch signals (on/off states), eliminating external interference via optoelectronic isolation to ensure signal stability.

Signal Preprocessing: Filters, amplifies, or attenuates input signals to avoid noise, e.g., removing high-frequency interference through hardware RC filter circuits.

The module integrates a multiplexer (MUX) to poll different input channels in a preset sequence for parallel multi-signal acquisition, with channel priority determined by address coding or software configuration.

When receiving Modbus TCP commands from a host computer, it unpacks IP datagrams via the Ethernet port, extracts Modbus protocol frames, and parses register addresses and instruction types.

For Modbus RTU signals from underlying devices, it receives them via the serial port, verifies CRC check codes, and converts them to standard protocol formats.

Multi-protocol Adaptation: Leveraging the computing power of the ARM Cortex processor, firmware parses and encapsulates protocols like Modbus TCP/IP, Modbus RTU, and DNP3. For example:

Protocol Mapping Mechanism: Establishes data mapping tables between different protocols through configuration software (e.g., ALSTOM's dedicated tools), such as mapping Modbus RTU coil states to Modbus TCP holding registers for cross-protocol data interaction.

Dual-port Network Backup: Supports linear or ring (DLR) topologies, automatically switching to the backup port when the primary network port fails to ensure communication continuity (e.g., Ethernet/IP ring network redundancy).

Network Diagnostics: Monitors link status (packet loss, latency) in real time, outputs network faults (port disconnection, IP conflict) via indicators or logs, and triggers reconnection.

Real-time Data Processing: Caches collected data in processor memory (RAM), processes it with preset algorithms (e.g., average, maximum filtering), and stores it in flash (Flash), supporting historical data query and alarm threshold judgment.

Logical Control Execution: Embeds a small PLC logic engine, allowing control programs to be written in ladder diagram or ST language. For example, when an input signal exceeds a threshold, it automatically triggers digital output or sends an alarm message.

If the module supports voltage/current sensing (similar to NRD108028), it samples voltage and current signals to calculate active power (P=UIcosφ), reactive power (Q=UIsinφ), and power factor (cosφ), accumulating watt-hours (Wh) and reactive watt-hours (Varh) in dedicated registers for host computer reading.

Converts digital values to analog signals (e.g., 4-20mA, 0-10V) via a DAC to drive actuators (control valves, frequency converters), with output accuracy typically ±0.5% FS.

Supports output clipping to prevent equipment damage from out-of-range outputs.

Uses relay or transistor outputs to switch states (on/off) upon receiving control instructions, e.g., controlling motor start/stop or valve switching. Some channels support pulse output (e.g., PWM signals).

Embeds a voltage monitoring chip to real-time detect 5.1V DC power input (e.g., NRD108028), triggering a power failure alarm when voltage drops below the threshold (e.g., 4.8V). A thermistor monitors module temperature, activating overheat protection above 60°C.

Periodically self-checks internal circuits (ADC, DAC, memory), detects data errors via CRC or parity checks, illuminates the FAULT indicator, and records fault codes upon hardware failure.

Firmware includes a watchdog mechanism that resets the module if program execution anomalies (e.g., infinite loops) occur. It supports remote firmware upgrades via Ethernet to fix vulnerabilities or add functions.