Alstom DEP232 029.223003 PC Board Digital Input Module

Description

Core Product Summary (Brand / Model / Key Attributes)

The Alstom DEP 232 (variant DEP 232.1, order number 029.223003) is a PC board digital input module from the Alstom 232-series control hardware family. It provides thirty-two discrete input channels, each operating at 24 VDC, and is used to monitor binary signals from external field devices in industrial automation installations.

The board is handled in the service market as a spare or replacement PC board for legacy Alstom control systems, where board-level exchange of a failed input module is the standard maintenance practice. Within the same 232-series hardware family, companion boards include the DAP 232 output module and the ICP 232 controller module, indicating a rack-based architecture in which the DEP 232 handles the digital input function.

Key Technical Specifications

Detailed Product Overview

The DEP 232 is part of Alstom’s 232-series of control system boards, an architecture that groups dedicated function boards around a controller module: the DEP 232 provides the digital input capacity, the DAP 232 covers the digital output side, and the ICP 232 acts as the controller element of the rack. This function-per-board structure allows input capacity to be scaled by populating additional boards and allows a failed input stage to be repaired by replacing a single board rather than the whole controller.

Each of the 32 input channels accepts a 24 VDC signal, making the module directly compatible with the standard binary field devices used across industrial plants — pushbuttons, limit switches, proximity sensors, auxiliary relay contacts, and similar devices that switch a 24-volt signal. The module’s role is to condition these field signals and present their states to the controller across the rack’s internal bus.

For maintenance purposes, the board is identified both by its DEP 232 model designation and by the numeric order number 029.223003, with the DEP 232.1 marking identifying the specific board variant. As legacy equipment, the module is typically sourced as new-old-stock or tested spare boards to keep existing installations running, since the surrounding control architecture predates current-generation platforms.

DEP232 029.223003

DEP232 029.223003

System Compatibility & Integration Requirements

Dimensions, Mounting & Connection Notes

• Format: PC board designed for installation in the Alstom 232-series control rack
• Identification: board marking DEP 232.1 with order number 029.223003
• Field wiring: terminates at the rack terminal system associated with the board slot; verify the slot-to-terminal mapping against the installation documentation before replacement
• Handling: observe ESD precautions when handling the bare board, and power down the rack before removal or insertion

Engineering Selection Highlights

• Order number precision — specify 029.223003 (DEP 232.1) when ordering; Alstom 232-series boards share the DEP/DAP/ICP naming pattern, and the numeric order number is the reliable identifier for this exact board.
• Input standard — all 32 channels are 24 VDC; field signals at other voltage levels require interposing relays or signal conversion.
• Channel capacity — 32 discrete inputs per board provides high density per rack slot; confirm slot addressing and rack power allocation when adding boards.
• Family architecture — the board operates as part of the Alstom 232-series rack system alongside DAP 232 output and ICP 232 controller boards; it does not function as a stand-alone input unit without the rack backplane and controller.
• Spares strategy — for aging installations, board-level replacement with a matching-order-number spare is the practical repair path; matched boards avoid addressing and configuration discrepancies.
• Companion boards — when servicing a rack, note the distinct order numbers of the input (DEP 232, 029.223003) and output (DAP 232) boards so each slot receives the correct spare.

FAQ

What is the Alstom DEP 232 029.223003?
It is a digital input PC board from Alstom’s 232-series control hardware family, providing 32 discrete input channels at 24 VDC. The board variant is DEP 232.1 and the order number is 029.223003.

How many inputs does the module provide?
Thirty-two discrete input channels, each operating at 24 VDC.

What is the DEP 232.1 designation?
It identifies the specific board variant of the DEP 232 input module, carrying order number 029.223003.

Which systems does it work with?
It belongs to the Alstom 232-series rack architecture, which also includes the DAP 232 digital output module and the ICP 232 controller module.

What signals connect to its inputs?
Standard 24 VDC binary field devices such as pushbuttons, limit switches, proximity sensors, and relay contacts.

Can the board operate stand-alone?
No. The DEP 232 is a rack-mounted board and depends on the backplane and controller of the 232-series system for power and communication.

How is the board typically sourced?
As a spare or replacement PC board for maintaining existing Alstom installations, usually from new-old-stock or tested refurbished inventory.

Verification & Troubleshooting Notes

• Board not recognized after installation: confirm the board is fully seated in its rack slot with the rack powered down, then reapply power and check the controller’s I/O status.
• One or more inputs reading incorrectly: verify the 24 VDC signal is actually present at the rack terminal for that channel before suspecting the board; a contiguous group of failed channels usually indicates localized board damage.
• Erratic input states: check the 24 VDC field supply for regulation and noise, particularly where the supply is shared with inductive loads.
• Isolating a fault: if a spare rack slot with the same board type is available, swap the DEP 232 into it to separate a board fault from a backplane, terminal, or field-wiring fault.
• Replacement ordering: read the full order number (029.223003) and variant marking (DEP 232.1) from the board label rather than ordering by model name alone, since several Alstom 232-series boards use similar designations.
• All board removal, insertion, and wiring work should be performed with the rack powered down and ESD precautions observed.