Alstom 31166-029-11-G CPU PD Board

Alstom 31166-029-11-G CPU/PD Board is a Vital Processor Interlocking (VPI) central processing unit/polynomial divider module used in Alstom’s VPI II signaling systems. The 31166-029-11 variant ships with VPI system software and is designed to plug into a VPI CPU/PD chassis to perform core processing and interlocking logic within a vital signaling subsystem. Key specs include a 500 mA board logic current supply (600 mA when the optional HHT is connected), support for 27C128 EPROM (200 ns) and 27C010 EPROM (70 ns), and configuration via a DIP-switch/jumper block (W1–W9) along with RESET, SYS-LO, SYS-HI and ADS-LO/ADS-HI controls. In typical deployments, it interfaces with other Vital boards such as VRD and VSC to implement route logic, fault diagnostics, and interlocking decisions in a rail signaling environment.