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Bachmann FS222/N FASTBUS Slave Module

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Fiber-Optic FASTBUS Communication (Long-Distance & EMI-Free)

• Multi-Mode Fiber Support: The dual LC-duplex FO ports enable data transmission over distances up to 2000 meters (using 50/125μm multi-mode fiber)—far exceeding copper RS-485’s ~1200m limit. This is critical for large facilities (e.g., a 1.5km-long oil refinery) or rail trains with distributed cars, where copper cables would suffer signal degradation.
• Optical Isolation: Unlike copper-based FASTBUS modules, the FS222/N’s FO interface provides complete electrical isolation between the M1 system and remote FASTBUS masters. This eliminates ground loops and protects against voltage surges (common in rail or mining environments), while fiber’s inherent EMI immunity ensures stable communication near high-voltage equipment (e.g., 25kV rail overhead lines, mining transformers).

3.2 Integrated Power Distribution for Remote Substations

• 25W Configurable Power Output: The module acts as a "power hub" for remote I/O substations, delivering regulated +5V (for logic circuits), +15V/-15V (for analog sensors/actuators) to connected devices. This eliminates the need for separate power supplies in distributed nodes—simplifying wiring and reducing cabinet space in remote locations (e.g., a rail car’s auxiliary control panel).
• Per-Rail Overcurrent Protection: Each power output rail (+5V, +15V, -15V) includes independent overcurrent limiting. For example, if a remote analog sensor shorts the +15V rail, the module limits current to 0.6A, preventing damage to the FS222/N and the M1 backplane.

3.3 Deterministic & Scalable Data Exchange

• High-Speed, Low-Jitter Performance: 10 Mbps FASTBUS data rate with <10µs jitter ensures real-time synchronization for time-sensitive tasks—such as rail vehicle door control (where delays could cause passenger safety risks) or process valve actuation (where timing errors lead to product waste).
• 32-Bit Data Object Support: Natively handles 8–32-bit data (integers, floats, booleans) without conversion, enabling direct mapping to M1 controller variables (via M1 Configurator). For example, a 32-bit output object can transmit precise pressure readings (from a remote sensor) to the FASTBUS master, while an 8-bit input object receives "start/stop" commands.

3.4 Harsh-Environment Durability

• Extended Temperature Range: The standard model operates at -30°C ~ +60°C, while the ColdClimate option withstands -40°C ~ +60°C—suitable for cold-weather rail routes (e.g., Nordic countries) or unheated industrial facilities.
• Rail-Grade Vibration Resistance: 5g vibration tolerance (per EN 50155) ensures the module remains stable in moving rail vehicles or vibrating machinery (e.g., mining conveyors), preventing loose connections or component failure.

3.5 Diagnostics & Safety Features

• Real-Time Status Monitoring: Transmits FASTBUS and power-related diagnostics to the M1 CPU, including FO link status (e.g., "FO Port 1: Connected"), power output current, and error counts (e.g., "CRC errors"). LED indicators on the module provide at-a-glance alerts: green (FO active), yellow (power normal), red (fault).
• Watchdog Timer: Configurable watchdog (10ms–1s timeout) monitors FASTBUS communication. If the master fails to send valid data, the module triggers a "communication loss" alert and sets power outputs to pre-defined safe states (e.g., shut down +15V to analog sensors) to prevent unsafe operation.

4. Typical Applications

• Rail Vehicle Distributed Control: Powers and communicates with 3 remote I/O substations (each monitoring HVAC/lighting in a rail car) via 1.5km multi-mode fiber. The FS222/N acts as a slave to the train’s TCMS master, transmitting car status data and receiving control commands—fiber’s EMI immunity avoids interference from the train’s traction system.
• Oil Refinery Process Monitoring: Connects 8 remote pressure/temperature sensors (via a 2km fiber loop) to a central FASTBUS SCADA master. The module supplies +5V to sensor logic and +15V to analog circuits, while transmitting real-time sensor data to the master—long fiber range eliminates the need for intermediate repeaters.
• Mining Conveyor Control: Links the M1 controller (managing a 1km-long conveyor) to a FASTBUS master in the mine’s control room via 1.8km fiber. The FS222/N receives speed commands from the master and sends conveyor torque/status data, with vibration resistance ensuring reliability in the dusty, high-vibration mining environment.

5. Usage Notes

1. Fiber Optic Installation
   • Fiber Type Matching: Use only 50/125μm or 62.5/125μm multi-mode fiber (OM2/OM3 grade) to ensure 2000m transmission. Single-mode fiber is not compatible and will cause signal loss.
   • LC Connector Handling: Clean LC connectors with lint-free wipes and fiber cleaner before installation—dust or oil on connectors causes link drops. Use duplex fiber jumpers (minimum 2mm jacket) for industrial durability.
   • Fiber Bend Radius: Maintain a minimum bend radius of 30mm (static) or 60mm (dynamic) to avoid fiber breakage or signal attenuation.
2. Power Distribution Setup
   • Load Calculation: Ensure total power draw from +5V/+15V/-15V outputs does not exceed 25W. For example: 3A (+5V) + 0.4A (+15V) + 0.2A (-15V) = 15W + 6W + 3W = 24W (safe); avoid overloading (e.g., 4.5A on +5V = 22.5W alone).
   • Safe State Configuration: In M1 Configurator, define safe states for power outputs (e.g., "communication loss → set +15V to 0V"). This prevents damage to remote devices if FASTBUS fails.
3. Network Configuration
   • Slave Address Assignment: Assign a unique address (1–127) to each FS222/N in the network—duplicate addresses cause bus collisions. Use LSS (Layer Setting Services) for automatic addressing in large systems (10+ slaves).
   • FASTBUS Bit Rate: Set the bit rate to 10 Mbps (recommended for real-time) or 5 Mbps (for longer fiber links). Ensure all slaves/members match the master’s rate—mismatched rates result in data corruption.
4. Troubleshooting
   • FO Link Issues: If the green FO LED is off, check fiber continuity with an optical power meter (minimum -10dBm received power). Replace faulty fiber or connectors if power is below -15dBm.
   • Power Output Faults: If the yellow power LED flashes, use M1 Configurator to check overcurrent status—disconnect the faulty load (e.g., shorted sensor) and reset the module via software.
   • Watchdog Triggers: Frequent watchdog alerts indicate a unstable master or fiber link. Increase the timeout (if allowed) or test the link with a temporary short fiber (10m) to isolate master vs. fiber issues.

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