What the K31-B2 does in the rack
The Omron K31- is a meter communication output board — it sits in a PLC rack and handles the data path between the meter and the controller's backplane.
The K31- is classified at a mature lifecycle stage — it's not in active new-product introduction, but it remains available through independent distribution channels. No official successor or direct replacement is listed. Source the BOM line against this specific order code.