Description
Technical Specifications
- Product Model: ALP121-S001
- Brand: Yokogawa
- Warranty: One Year
- Input Voltage: 24 VDC (18–30 VDC) backplane supply
- Operating Temperature: -20 °C to +60 °C
- Storage Temperature: -40 °C to +85 °C
- Response Time: Deterministic PROFIBUS cycle time ≥ 1 ms
- Protection Class: IP20 rack-mounted module housing
- Accuracy Class: N/A (Fieldbus communication module)
- Output Frequency: N/A
- Rated Current Range: Module consumption ≤ 350 mA
- Communication Interface: 1 × D-SUB9 PROFIBUS-DP port, internal ESB backplane connector
- Supported Protocols: PROFIBUS-DP (DP-V0, DP-V1), ESB bus
- Overload Capacity: Galvanic isolation between backplane and fieldbus; ESD and surge protection on bus terminals
- Dimensions: 127 mm × 131 mm × 33 mm
Product Overview
The ALP121-S001 is a PROFIBUS-DP master communication module built for Yokogawa CENTUM VP DCS platform, compatible with N-IO and FIO field I/O hardware. It serves as the gateway between the DCS ESB system bus and external PROFIBUS-DP field networks, managing cyclic data exchange with remote slave devices including distributed I/O stations, variable speed drives, flow transmitters and valve controllers. The module supports up to 32 PROFIBUS slave nodes and provides comprehensive bus diagnostics to detect cable faults, slave loss and signal attenuation. Control and instrumentation engineers implement this hardware to integrate legacy PROFIBUS field equipment into modern CENTUM VP process control systems. It eliminates the requirement for intermediate protocol converters, streamlines system architecture and enables consistent real-time monitoring and closed-loop control across hybrid automation infrastructure.
Application Scenarios
- Petrochemical Refinery Process Control: Links CENTUM VP controllers to PROFIBUS-based motor control centres and field valve positioners. Continuous bus diagnostics accelerate fault identification for critical distillation and separation unit operations.
- Natural Gas Processing Plants: Interfaces with PROFIBUS flow computers, turboexpander control units and safety-related I/O racks. Galvanic isolation mitigates ground loop interference across large-area processing sites.
- Power Plant Balance-of-Plant Control: Connects auxiliary drives, fan dampers and feedwater valve assemblies to the main DCS network. Supports high-speed cyclic data exchange to maintain stable boiler and turbine auxiliary regulation.
- Water & Wastewater Treatment Facilities: Integrates PROFIBUS pumping stations, aeration drives and online analysers into centralised DCS monitoring. Flexible baud rate adjustment supports long-distance fieldbus cabling across geographically distributed assets.
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