8030-ROM-222. The Symax Class 8030 Type ROM222 120 VAC Output Module contains 16 optically isolated outputs, each capable of driving loads such as motor starters, solenoids, or pilot lights. The module may be inserted into any slot of a register rack (except slot 1) or the register slot of a digital rack. Sixteen red LED on the front of the module, labeled 1-16, illuminate when a command is issued to energize their respective outputs. In addition, 4 red LED indicators labeled (FU1-FU4 (one per group of 4 outputs successively) illuminate if a blown fuse is detected.