FOXBORO A4H124-24FX P0973JN 24-Port Fiber Managed Switch

I. Basic Information

• Full Model: A4H124-24FX P0973JN

• Series: Belongs to the FOXBORO I/A Series digital input/output (DI/DO) module, suitable for industrial automation distributed control systems (DCS).

• Purpose: As an interface between field devices and control systems, it enables digital signal acquisition (DI) or control command output (DO), supporting status monitoring and logical control of switches, relays, sensors, and other devices.

II. Functions and Features

Signal Types and Channel Characteristics

• Digital Input (DI) Function:
  Supports dry contact (passive) or wet contact (active) input to detect on/off status of field devices (e.g., valve signals, motor start/stop signals).
  Short input response time ensures real-time performance (typical value ≤10ms).
• Digital Output (DO) Function:
  Outputs 24V DC switching signals with a maximum load current of 2A per channel, supporting resistive (relays) or inductive (solenoid valves) loads.
  Channel count: Commonly 16-way DO (subject to the manual for specifics).
• Isolation Design:
  Electrical isolation voltage between channels ≥500V AC effectively resists interference and ensures system stability.

Status Indication and Reliability

• LED Indicators: Real-time display of power (POWER), operation (RUN), fault (FAULT), and channel status for on-site maintenance.

• Hot-Swap Support: Enables module replacement during system operation without affecting the control process.

• Diagnostic Function: Supports channel-level fault detection (short circuit, open circuit, overload) and reports alarms via DCS.

III. Technical Parameters

IV. Application Scenarios

Process Industry Automation

• Chemical/Petrochemical: Connects pressure switches and level switches to monitor tank status; drives solenoid valves via DO for process control; collects pump/valve start/stop signals via DI.

• Power System: DI reads auxiliary contact status of circuit breakers and contactors; DO remotely controls switching equipment, supporting substation automation.

Discrete Manufacturing

• Metallurgical/Mechanical: DI collects position signals from photoelectric sensors and limit switches; DO controls cylinder/motor start/stop for production line logic control.

Safety and Interlock Systems

V. Installation and Usage Guidelines

Hardware Installation

• Fix in control cabinets using DIN rails, ensuring good ventilation and avoiding high temperatures.

• Wiring Requirements:

• DI input: Dry contacts require external 24V DC power; wet contacts connect directly to signal sources. Use shielded twisted-pair cables with grounding resistance ≤1Ω.

• DO output: Load current ≤2A. Inductive loads must have freewheeling diodes (e.g., IN4007) in parallel to prevent back EMF damage.

• Communication buses (e.g., Profibus) must connect to terminal resistors (120Ω) for stable communication.

Software Configuration

• Through FOXBORO I/A Series dedicated software (e.g., Engineering Workbench):

• Configure module addresses, communication protocols, and channel types (DI/DO).

• Define mapping between signals and controller variables (e.g., associating DI status with PLC registers).

Fault Troubleshooting

• If "FAULT" light is on: Check for loose wiring, overloaded loads, or view fault codes via system diagnostic tools.

• For communication interruptions: Verify bus connections, module address conflicts, or excessive bus load rate (recommended ≤30%).

VI. Typical Supporting Equipment

• Controllers: FOXBORO I/A Series CPU modules (e.g., P0400YX, P0960XX).

• Field Devices:

• DI: Limit switches (e.g., OMRON WLCA12), proximity sensors (e.g., Turck NI15-U1), pressure switches (e.g., FOXBORO PFTL101).

• DO: Relay modules (e.g., FOXBORO RTU series), solenoid valves (e.g., ASCO 2-way valves), indicator lights.

• Communication & Auxiliary Modules: FOXBORO bus adapters, communication expansion modules, power modules (e.g., P0904XX).