Product Details:

MODICON ASP890300 is an intelligent remote I/O processor and powered RIO receiver built for Modicon 800 series distributed automation platforms. It serves as the core interface between the main PLC controller and remote 800 I/O racks, transmitting digital and analog field signals through single or redundant coaxial RIO cables. This unit retains backward compatibility with legacy P890 and P892 predecessors, supporting dual cable redundant network configuration to improve communication reliability for critical process lines. It integrates onboard power supply for downstream remote I/O racks, simplifying cabinet wiring layout for distributed nodes. Designed for rack mounting inside standard control cabinets, it adopts industrial-grade circuit design with built-in EMC and surge suppression to resist electromagnetic interference in heavy industrial environments. As an obsolete original spare part, it is mainly used for maintenance and retrofit of old Modicon RIO automation systems. Using the original replacement unit can preserve the existing coaxial network architecture, avoid large-scale rewiring and effectively reduce production downtime.

Basic Parameters

Product type: remote I/O processor with integrated power

Network: S908 RIO coaxial network, single / dual cable selectable

Compatible I/O: Modicon 800 series remote I/O racks

Installation: rack mount

Configuration: rotary switch for node and mode setting

Operating temperature: 0°C ~ +60°C

Protection grade: IP20

Supported Functions

RIO network data transmission and reception

Distributed I/O point data exchange

Redundant cable communication switching

Remote rack power feed

Node address and operation mode setup

Signal forwarding between host CPU and field I/O

Core Functions

Continuous polling of remote I/O racks

Onboard LED status indication for network and power

Communication fault capture and flag storage

Data frame verification and error retransmission

Hot replacement support for compatible racks

Diagnostic information output for field troubleshooting

Hardware Specifications & Environmental Features

Built-in transient surge suppression circuit

Storage temperature: -25°C ~ +70°C

Relative humidity: 5% to 95% non-condensing

Status: Obsolete original part, available for spare replacement

Industry Applications: Applied in legacy petrochemical process control, old pulp and paper production lines, mining auxiliary automation and large conveyor distributed signal acquisition systems.

Note: Confirm coaxial cable type, host controller compatibility and existing RIO node layout before ordering.

This is from our current stock.

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