Product Details

Modicon S975-000, also commonly referenced as AM‑S975‑000, is a professional modbus ii communication board and high‑performance network interface card designed for Modicon 984 series PLC chassis. This fieldbus adapter enables the host controller to join the Modbus II industrial fieldbus, supporting high‑speed peer data exchange between multiple Modicon PLCs, remote I/O racks, supervisory hosts and intelligent field instruments. It offloads network communication tasks from the main CPU, stabilising program scan cycles while transmitting real‑time process values, alarm signals and setpoint commands across the distributed control network. Equipped with status LED indicators for power, bus activity and fault alerts, this modbus ii communication board allows fast on‑site diagnosis. As a discontinued legacy spare, this network interface card serves as a drop‑in replacement to restore fieldbus connectivity for ageing Modicon automation racks.

Basic Parameters

Brand: Modicon (Schneider legacy)

Model: S975-000 / AM-S975-000

Product Type: Modbus II Fieldbus Communication Board

Compatible Rack: Modicon 984 series chassis and backplane

Communication Protocol: Modbus II

Bus Type: Industrial peer-to-peer fieldbus

Indicators: Onboard LED for power, bus traffic and fault status

Form Factor: Single slot rack-mounted board

Programming: Configurable node address and communication parameters

Product Status: Discontinued legacy spare

Net Weight: Approximately 0.38 kg

Supported Functions

This modbus ii communication board supports bidirectional Modbus II bus transmission, message packaging, checksum verification and automatic retry for failed transmissions. The network interface card monitors bus node status and forwards register data, alarm messages and control commands between the local PLC and remote network nodes. This fieldbus adapter supports built‑in self‑diagnosis for bus disconnection, address conflict and hardware faults, and retains network configuration after power cycling. It facilitates multi-controller interlocking, distributed data sharing and remote supervisory access for legacy process control systems.

Core Functions

As a dedicated fieldbus adapter, this modbus ii communication board bridges the PLC internal backplane and the Modbus II fieldbus, routing control data between distributed automation stations. It isolates bus-side electrical interference to protect the rack backplane and manages network handshake logic independently. This network interface card acts as a direct spare to rebuild Modbus II fieldbus communication for ageing Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Shielded industrial PCB assembly with metal retainer

Protection: Onboard transient surge suppression for bus terminals

Anti-interference: Differential bus signal design to reduce EMI and ground loop noise

Compatibility: Matches Modicon 984 series backplane and compatible peripheral modules

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm chassis compatibility, Modbus II node address and bus termination setting before ordering.

This is from our current stock.

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