End-of-life — plan the swap now
The 6ES7323-1BH81-0AA0: No stock-holding claim.
What this SM 323 module does
The 6ES7323-1BH81-0AA0 is a SIMATIC S7-300 digital combination module: 8 inputs and 8 outputs on one 40 mm-wide unit. It is optically isolated between the channels and the backplane bus. Rated supply is 24 V DC (20.4 V to 28.8 V permissible range). Each output delivers 500 mA rated value, with a total current limit of 2 A across all eight outputs, derated to 4 A at 60 °C. Inputs accept 2-wire sensors; signal "1" threshold is 13 to 30 V, signal "0" is -30 to +5 V. Typical input current at signal "1" is 7 mA.
Wiring and integration notes
Requires a 20-pin front connector (sold separately). The module snaps onto the S7-300 DIN rail and connects to the backplane bus via the standard ribbon connector. Outputs switch resistive loads up to 100 Hz and inductive loads up to 0.5 Hz. Inductive shutdown voltage is clamped to L+ (-48 V).
Sourcing this EOL module
Because the 6ES7323-1BH81-0AA0 is EOL, the primary channel is the independent surplus and new-old-stock market. Confirm the BOM position count and the mating half before committing. Power consumption: 4.5 W typical, drawing 40 mA from the 5 V DC backplane bus and up to 20 mA from the load voltage L+ (unloaded).