FOXBORO A4H124-24TX / P0973JM Industrial Control Switch Complete Information
I. Basic Identity
Original Manufacturer: Enterasys (later acquired by Extreme Networks), Foxboro (a brand under Schneider) under license, as a dedicated control network switch for I/A Series / Evo DCS control system
Hardware Model: A4H124-24TX; Foxboro Part Number: P0973JM
Comparison of the same series:
P0973JN = A4H124-24FX (24 fiber port version)
P0973JM = 24-core copper cable RJ45 10/100M access version
Port Hardware Configuration (Original Manufacturer Manual Standard)
24 × 100Base-TX RJ45 electrical ports (10/100M auto-sensing): used for connecting FCP controllers, FBM IO modules, operator stations / engineer stations, servers
2 fixed RJ45 gigabit ports (10/100/1000BASE-T): can be used for switch stacking (ISL link) or gigabit electrical port uplink
2 SFP gigabit slots (1000Base-X): can be plugged in optical modules for long-distance fiber uplink, ring network redundancy
Compatible Foxboro supporting optical module models: P0972WT, P0972WU, P0972YQ, P0972YL
DB9 RS232 Console debugging serial port: local CLI command line configuration, firmware upgrade, fault diagnosis
Overall Specifications: 1U height, standard 19-inch rack installation, size approximately 442mm × 219mm × 44mm, net weight approximately 3.6kg
Key Performance Parameters
Switching Capacity: 48Gbps
Packet Forwarding Rate: 35.7–36 Mpps
MAC Address Table: Supports 8000 MAC addresses
Power Supply: Built-in wide-range AC power 100–240VAC 50/60Hz; can be connected with redundant power supply (STK-RPS-150PS/500PS) to eliminate power single-point failure
Power Consumption: Typical 30W, maximum about 45W under full load
Environmental Conditions:
Operating Temperature: 0℃ ~ +50℃ (control room cabinet environment)
Storage Temperature: -40℃ ~ +70℃
Humidity: 5%–95% without condensation
MTBF: ≥500,000 hours, suitable for 7×24 non-stop industrial control operation
Layer 2 Network Management Function (Compatible with DCS Industrial Control Network)
VLAN: IEEE 802.1Q, maximum support 4096 VLANs, isolating control network from office network
Spanning Tree: STP (802.1d)/RSTP fast spanning tree (802.1w), establishing redundant ring network, rapid link failure switching, eliminating network storms
QoS: 802.1p packet priority, ensuring DCS control instructions, alarm messages are prioritized for forwarding
LACP Link Aggregation: multiple links bandwidth stacking + backup
Port Mirroring: capturing control network packets, troubleshooting controller communication interruption, packet loss faults
Network Monitoring: SNMP v1/v2c, RMON, connecting to upper-level network management system for remote monitoring of port status, traffic alarms
Stacking: up to 8 of the same model switches can be stacked, virtualized into one device for unified management, expanding port quantity
Security Control: ACL access control, MAC address filtering, 802.1X port authentication, preventing illegal devices from accessing the production control network Management methods: Console serial port CLI command line, Web page management, SNMP remote management
Typical applications in the Foxboro DCS system
Control layer node switch: Connects FCP270/FCP280 controllers and various FBM field IO modules to achieve real-time interaction of control data
Operator station and engineer station connection: Connects operator stations and engineer stations to complete screen monitoring, configuration download, and fault diagnosis
Dual network redundant architecture: Two P0973JM devices build redundant control networks A network / B network respectively, and a single switch failure will not interrupt production control
Plant-level system connection: Connects to MES system, real-time database, and dispatching system through SFP optical ports
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