Digital guide
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ALSTOM DEP232 029
Product Name: DEP232 interface and I/O module for Alstom Alspa and related control systems.
Product Introduction: DEP232 is supplied in Alstom automation and signaling configurations as a serial communication interface or as a digital input/output module for Alspa P320/P620 racks and railway interlocking systems. The suffix 029 identifies a specific variant or order configuration and must be verified against the rack documentation.
Detailed content
Technical Specifications: Backplane supply 24 VDC from the rack; serial versions provide 1 or 2 ports with RS-232 or RS-485, 300 bps to 115.2 kbps, Modbus RTU, IEC 60870-5-101 or proprietary Alstom ASCII according to firmware; digital variants are configured with multiple optically isolated outputs or, in separate DEP232 listings, 32 input channels at 24 VDC; port-to-backplane isolation up to 2500 Vrms in serial versions; operating temperature -40°C to +70°C for railway grades.
Function Features: Optical isolation between field side and backplane; fail-safe processing in vital railway versions; LED status; rack insertion; protocol selection by firmware and termination setting.
Application Scenarios: Alspa DCS extension for meters and protection relays; railway electronic interlocking; CBTC wayside I/O; track occupation and point detection interface.
Performance Parameters: Baud rate, protocol frame time and voting response are defined by firmware and master controller; isolation and ESD protection follow the selected serial or I/O variant.
Material Composition: Industrial multilayer PCB, insulating housing, gold or tinned backplane contacts, metal shielding where required by the serial transceiver version.
Structural Characteristics: Plug-in board for Alspa backplane; serial connectors as DB9 or screw terminals; dip switches or firmware parameters for address and termination; status LEDs on the front.
Working Principle: Field serial data or discrete contact states are received, isolated and converted by the onboard interface, then passed to the Alspa controller or signaling processor for logic execution and supervision.
Installation Requirements: Verify firmware, backplane type and slot compatibility; set termination resistors correctly on RS-485 lines; insert only with qualified personnel for SIL/vital configurations; confirm 24 VDC backplane supply polarity and rating.
Usage Precautions: Do not mix serial and digital firmware versions in the same slot configuration; verify the 029 suffix against the ordered function; test communication termination before system commissioning; follow EN 50121, EN 50128 and EN 50129 requirements where the project demands railway certification.
