Buy, repair, or exchange GE IS200ISBEH2A - ISbus Extender Board from World of Controls. We ship worldwide. Request a quote or contact our team for more details today. In addition to supplying circuit boards, WOC extends its offerings to encompass services such as circuit board/part testing and repair, control system/DCS troubleshooting, DOS support, HMI upgrades/backups, and control-related training.