System key extension for ST 56 (IP) with 30 programmable function keys (double assignment) incl. status display via LED (3 pieces of ePaper, self-labeling keys, switchable 2-level use incl. status display on both levels, 2-line labeling when using one level). Max. 3 STE 56 possible on one device. Power supply: when operating on an ST 56 digital port, a separate plug-in power supply is required from the first STE onwards; when operating on an ST 56 IP powered via PoE, a separate plug-in power supply (6100826) is necessary from the third STE 56 onwards!