ALSTOM 42011-106-00 A01 ITC_VIOM_VIOC VER.A01 Digital Control System Module

Enabling signal conversion and interaction between different systems (e.g., communication between train network systems and external devices).

Processing digital/analog input/output (DI/DO, AI/AO) and supporting industrial communication protocols.

Serving as an intermediate node to complete data acquisition, logic control, and signal amplification/isolation.

Input Adaptation: Supports wide-range DC power supplies (e.g., DC 24V/36V/110V, complying with rail transit standards), generating internal voltages (5V, 12V, etc.) via power conversion chips (e.g., DC-DC converters).

Protection Mechanisms: Features overvoltage, overcurrent, and short-circuit protection to avoid core circuit impacts from power fluctuations, ensuring stable module operation.

Digital Input (DI):
Receives external switch signals (e.g., button/sensor status) and prevents interference through optocoupler isolation (2.5kV~5kV electrical isolation).
Signals are level-converted and input into a microcontroller (e.g., ARM Cortex-M series), converted to digital logic values (0/1).

Analog Input (AI):
Acquires continuous signals from sensors (e.g., voltage, current, temperature), converting them to digital quantities via an ADC (analog-to-digital converter).
May include filter circuits (RC filtering or active filtering) to reduce noise and ensure data accuracy.

Microcontroller/Processor:
Executes preset programs to perform logical operations (AND, OR, NOT), data processing (filtering, calibration), and protocol conversion on input signals.
May integrate FPGA/ASIC for customized logic processing (e.g., high-speed signal timing control).

Storage Units:
Flash memory stores firmware programs and configuration parameters, while RAM caches operational data to ensure parameter retention during power outages (possibly paired with EEPROM).

Digital Output (DO):
The microcontroller outputs logic signals, which are optocoupler-isolated to drive power devices (e.g., MOSFETs, relays) and control external actuators (motors, valves, indicators).
Some channels support 2.5kV isolation to prevent load-side interference from affecting the main control circuit.

Analog Output (AO):
Converts digital signals to analog quantities (e.g., 4-20mA current, 0-10V voltage) via a DAC (digital-to-analog converter) to drive regulating valves, frequency converters, etc.
Output terminals may include amplification circuits to ensure signal driving capability meets industrial load requirements.

Industrial Communication Protocols:
Supports RS-232/485, CANopen, MVB (Train Communication Network), EtherCAT, etc., for communication with PLCs, host computers, or other modules.
Communication chips (e.g., MAX485, CAN controllers) handle level conversion and protocol parsing to ensure real-time and reliable data transmission.

Data Interaction Logic:
Receives master control commands as a slave or actively sends data (e.g., status reports) as a master, supporting periodic data refresh and event-triggered mechanisms.

Electrical Protection:
Interface terminals integrate TVS diodes and lightning protection circuits to prevent surge impacts (e.g., electromagnetic interference during train start/stop).
Circuit boards undergo three-proofing treatment (moisture, dust, salt spray resistance), complying with EN 50155 (rail transit environmental standards).

Mechanical and Environmental Adaptation:
Anti-vibration design (reinforced connectors, component soldering) adapts to high-frequency vibration in train operations.
Wide-temperature capability (possibly -40°C~+70°C) meets outdoor or harsh industrial environment requirements.

Signal Acquisition:
Receives DI/AI signals from train sensors (e.g., door status, brake pressure), transmits them to the microcontroller after input channel isolation.

Logic Processing:
The microcontroller judges signal status based on preset programs (e.g., safety logic, interlock conditions), e.g., "Traction command output allowed when doors are closed and brakes are released."

Output Control:
If logic conditions are met, drives relays via DO channels to start traction inverters; or outputs current signals via AO channels to adjust motor speed.

Communication Interaction:
Reports device status to the train's main control system via MVB network and receives master control commands (e.g., mode switching) for collaborative control of the entire train system.

Fault Monitoring and Protection:
Real-time monitoring of input/output signal anomalies (e.g., short circuits, disconnections), triggering protection mechanisms (e.g., output cutoff) and reporting fault codes to the monitoring system.