Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Toshiba |
| Model | PU662T |
| Controller family | S2T |
| Module category | CPU / sequence controller |
| User program memory | 32K steps |
| Programming interface | RS-232C |
| Computer-link interface | RS-422/485, 4-wire terminal connection |
| Programming software | T-PDS for the S2T generation |
| Ethernet | Requires a compatible optional Ethernet module |
| Mounting | Toshiba S2T rack/base system |
| Operating voltage | Confirm from the installed rack and system documentation |
| Operating temperature | Verify with the applicable Toshiba hardware manual |
| Dimensions | Verify against the exact module revision |
The Toshiba product list identifies PU662T as the 32K-step S2T CPU. Toshiba’s migration documentation also distinguishes it from the 64K-step PU672T.
Product Introduction
The Toshiba PU662T is the central processing module for the S2T sequence controller system. It executes the PLC user program, with a documented capacity of 32K steps, and provides serial interfaces for programming and computer-link communication.
For maintenance teams supporting installed S2T equipment, the PU662T can serve as a replacement CPU when the existing rack, power supply, I/O configuration, and program requirements are verified. It should not be treated as a direct substitute for every Toshiba V-Series CPU.
PU662T
Application Scenarios & Field Pitfalls (Engineer’s Perspective)
A legacy S2T controller can become a critical maintenance issue when the CPU fails but the installed I/O and field wiring remain serviceable. Replacing the processor without checking program capacity, communication wiring, and the existing system configuration can turn a straightforward repair into an extended commissioning task.
Typical application areas include:
- Manufacturing machinery: Sequence control for production equipment and machine interlocks.
- Process equipment: Logic execution for established industrial process-control installations.
- Material handling: PLC sequence operations in conveyor and transfer systems.
- Legacy plant systems: Maintenance of existing Toshiba S2T installations where a complete controller migration is not currently planned.
Field pitfalls to check before installation
1. Program capacity and CPU selection: PU662T is specified for 32K steps. The PU672T is a 64K-step S2T CPU, so confirm the installed program size and original CPU designation before selecting a replacement. Do not assume the two models are interchangeable without checking the application configuration.
2. Serial communication wiring: The programming port uses RS-232C, while the computer-link connection supports an RS-422/485 four-wire arrangement. Confirm the correct port, cable pinout, communication settings, and grounding before connecting an HMI or engineering workstation.
3. Rack and system compatibility: Verify the base unit, power supply, installed I/O modules, and any optional communication modules against the original system documentation. If the CPU is being replaced after a failure, check the battery condition and preserve a verified copy of the user program before commissioning.
Related Products
The following components belong to, or are documented for, the Toshiba S2T/S2E and V-Series environment. They have different functions and should not be treated as interchangeable CPU replacements.
- PU672T — S2T CPU with 64K-step user program memory. Consider when the original application requires the larger documented program capacity.
- PU612E — S2E CPU with 32K-step memory. It belongs to the S2E system rather than the S2T CPU configuration.
- PS693 — AC-input power module listed for the S2T/S2E controller family.
- PS632 — DC-input power module listed for the S2T/S2E controller family.
- BU643D — S2T basic base unit with a documented four-slot arrangement.
- C2PU37 — Computer module for the S2T system, with Pentium III 500 MHz processing hardware.
- EN611 — Ethernet module documented for use with PU662T and other supported S2T CPUs.
- EN631 — Ethernet module listed for the S2T /PU672T configuration.
- EN651A — Ethernet module listed among the compatible S2T Ethernet options.
Procurement and inspection notes
Before ordering a , confirm the complete model marking and any suffix or revision information on the installed unit. For a used or surplus module, request clear photographs of the front label, connector area, and diagnostic indicators. Where possible, obtain confirmation of CPU startup, fault status, battery condition, and program retention. A physical match alone does not establish that the module contains the correct application program or will operate correctly in the existing system.
For replacement planning, compare the installed CPU against the Toshiba S2T hardware documentation and confirm the program backup and communication configuration before commissioning.
