Schneider Electric Modicon AS-J890-102 Remote I/O Processor Module

The Schneider Electric Modicon AS-J890-102 is a dual-channel remote I/O (RIO) processor module engineered for Modicon 800 Series I/O systems and 984 programmable logic controllers. It establishes high-speed, deterministic data communication between local CPU backplanes and remote field drops over S908 coaxial networks. Featuring dual coaxial communication channels and an integrated communication status array, the AS-J890-102 delivers physical media redundancy and immediate diagnostic monitoring to safeguard network health.

Redundant Coaxial Communication Architecture

Operating over standard S908 network infrastructure at a 1.544 Mbps data transfer rate, the AS-J890-102 functions as a primary interface node for remote I/O drops. Its dual-channel design utilizes two front-facing F-connector coaxial ports. This allows setup in redundant-cable topologies, ensuring continuous data transmission to and from the main processor rack even if one coaxial cable run experiences an open or short circuit.

Compared to standard single-channel remote interface units, the dual-channel configuration continuously manages primary and secondary signal lines. Address selection for each remote drop is accomplished using onboard configuration rotary or DIP switches before inserting the card into the rack slot.

Integrated Status LED Array and System Monitoring

The module features an integrated communication status array on the front panel. This dedicated LED matrix provides visual feedback covering system readiness, active channel communication, and transmission errors across both channels.

By providing clear hardware-level indicators, maintenance personnel can assess network health, verify link synchronization, and isolate drop faults on site without connecting external programming software. The unit inserts directly into standard Modicon 800 Series primary housings, receiving operational power through the internal backplane bus.

Technical Specifications

Frequently Asked Questions

Q: What is the main distinction between the AS-J890-002 and the AS-J890-102 modules?

A: While both are dual-channel remote I/O processor modules for Modicon 800 Series drops, the AS-J890-102 includes an expanded communication status array on the front panel for advanced visual link diagnostics and network health monitoring.

Q: Can the AS-J890-102 operate with only one coaxial cable connected?

A: Yes, the module can operate on a single coaxial connection. However, connecting both coaxial ports enables automatic redundant cable switching, which maintains drop communication during single cable faults.