The OB101/01/3/01 Issue 4 ACE Input Card is a SPECTOR/LUMINEX ACE input module identified by model OB101/01/3/01 with Issue 4 revision, designed as part of ACE control hardware for handling input signals. Listings explicitly describe it as an ACE Input Card, with references such as the eBay listing “SPECTOR / LUMINEX OB101/01/3/01 ISSUE 4 ACE INPUT CARD NEW” and the Mining & Industrial Surplus page labeled “Spector/Lumenex Ace Input Card PCB OB101/01/3/01,” validating its identity and function. These sources corroborate the part number, classification, and role of this OB101 card within ACE system hardware.
