16 relay outputs in two isolated groups
The 6ES7322-1HH00-0AA0 is a SIMATIC S7-300 SM 322 digital output module carrying 16 relay outputs, arranged as two electrically isolated groups of 8 (2 x 8 DO). Each group connects via the 20-pin front connector, and the relay contacts are optically isolated from the backplane bus — meaning a short on one output group won't drag down the CPU or the other group.
Lifecycle status: eol_hot
What the relay outputs mean for your panel
The 16 relay outputs are rated for AC and DC loads per the contact rating. The two isolated groups allow mixing load voltages on the same module. The 20-pin front connector matches the standard S7-300 wiring scheme; the module snaps onto the DIN rail in the same footprint as any SM 322.