1756-IB16 TC-IDD161. Cables are available in 0.5m, 1.0m, 2.5m, and 5.0m standard lengths (005=0.5m, 010=1.0m, 025=2.5m, 050=5.0m). Custom length cables are also available. LED provides field side device indication. For operation from a single power source connect COM0 and COM1 terminals together. TB2 terminals are separated from the load device.