The ALU 201 serves as a central processing unit inside Schneider’s Modicon 984 automation platform. This module measures roughly 12.0 inches long, 1.4 inches wide, and 6.5 inches high. Moreover, it weighs about 1.8 pounds, which suits standard rack installation. Engineers deploy the ALU 201 when they need dependable logic execution in legacy 984 control systems.
Technical Specifications and Interface Details
The CPU executes application programs and therefore manages discrete and analog control tasks. Specifically, it carries onboard memory for ladder logic and register data. Additionally, rear connectors link the unit to the Modicon 984 backplane and I/O modules. Front-panel indicators reveal run, fault, and battery status at a glance.
| Parameter | Specification |
|---|---|
| Module Type | CPU Module |
| Function | Logic and process control |
| Dimensions | 12.0 x 1.4 x 6.5 in |
| Weight | ~1.8 lbs |
| Interface | Modicon 984 backplane |
| Indicators | Run, fault, battery LEDs |
| Mounting | Modicon 984 rack |
| Power | Backplane supplied |
Energy Storage and Program Retention
A backup battery on the ALU 201 preserves application code during power interruptions. Consequently, the CPU resumes operation without reloading programs from external media. Internal capacitors further stabilize logic voltage across brief supply dips. This buffering therefore protects critical control sequences in continuous production environments.
Installation and Compatibility Notes
Because the ALU 201 slides directly into Modicon 984 racks, technicians complete installation quickly. They should confirm connector alignment before they apply power to the system. Furthermore, the module integrates smoothly with existing 984 control hardware. Always store spare units in anti-static packaging to protect sensitive circuitry.
Details
| Weight | 0.15 kg |
|---|---|
| Dimensions | 110 × 72 × 38 mm |
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