Overview
The Modicon 984 Series 7-Slot I/O Chassis Rack by Schneider Electric is a robust, field-proven housing solution designed for large-scale industrial automation and motion control systems. This modular backplane architecture supports multiple system components in a single enclosure, making it an essential building block for complex PLC configurations across discrete manufacturing, process control, and legacy facility upgrades.
Key Features
- Seven-Slot Modular Backplane: Equipped with seven slots, this chassis allows for the integration of controllers, power supplies, option processors, and I/O modules, facilitating a comprehensive and scalable control system.
- Flexible Mounting: The chassis can be mounted in a standard 19-inch EIA rack or on the rear panel of a 10-inch NEMA enclosure, providing flexibility in installation.
- High I/O Density: Its design supports the integration of up to 32 I/O modules, making it suitable for complex control applications requiring extensive input and output capabilities.
- Industrial Shielding: Provides protection against external electromagnetic and radio frequency interference, ensuring reliable operation in industrial settings.
- Proven Legacy Design: These Modicon 984 models were large, rugged, high-performance chassis mount controllers. They were top of the range from 1986 through 1994, when the Quantum series became available.
Technical Specifications
- Slots: 7 available expansion slots
- Max I/O Modules: Up to 32 I/O modules supported
- Mounting Options: 19-inch EIA rack or 10-inch NEMA panel/bulkhead
- Interchangeable Side Plates: Yes, supports both rack and panel configurations
- Power Supply Compatibility: Systems that use the seven-slot chassis use the P933 Power Supply
- Environmental Protection: EMI/RFI shielding integrated
- Compatible Processor Series: 984-68x and 984-78x controllers with optional modules
- Backplane Type: Modular slot-mount architecture
Typical Applications
The Modicon 984 Series 7-Slot Chassis is ideal for:
- Discrete manufacturing and machine control systems
- Process automation and batch control
- Remote I/O mastering with up to 31 drops of remote I/O. For remote I/O, an optional S908 processor is required
- Multi-drop Modbus and Modbus Plus networking
- Legacy system retrofits and facility upgrades where 984 controllers are already deployed
- Applications requiring high-density, modular I/O configuration
Compatibility & Replacements
Compatible With
- Modicon 984-68x series slot-mount PLC controllers
- Modicon 984-78x series slot-mount PLC controllers
- P933 power supply modules
- 800-Series I/O modules (discrete and analog)
- S908 Remote I/O Processor for extended remote I/O drops
- S985 Modbus Plus adapter cards and communication modules
- C986 CoProcessor modules for multiprocessing capability
- Optional memory modules (M909) and communication interfaces
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. This chassis is a foundational housing component; compatibility depends on your existing controller model and module configuration. Modicon 984 systems from the same era typically use interchangeable 7-slot and multi-slot housings with proper backplane specifications.
Works With
- Modbus: Native Modbus serial communication with standard interfaces
- Modbus Plus: Peer-to-peer industrial networking with optional S985 adapters
- Remote I/O: S908-based local drop and multi-drop configurations
- Programming Software: Modsoft and legacy PLC development tools supporting 984 series
- Option Module Slots: Supports commercially available option cards and expansion modules
