Island bus expansion module for decentralized sub-islands with TX-I/O-modules Expand island bus to a distance of up to 2 x 200 metersCompact design per DIN 43 880, requires little spaceWith LED to monitor communication statusEasy installation and setup:Mounted on standard railsSelf-connecting bus (island bus) for the easiest possible installationPlug-in screw terminals for island bus expansionNo programming / parameterization tool required