SINAMICS V20 BOP Size: 76x85x30 (WxHxD) Control unit for frequency converter SINAMICS Basic Operator Panel (BOP) for SINAMICS V20. The BOP has the same function as the integrated BOP, but can also be used for separate installation. The values can be changed using a rotary knob. The panel is used for decentralized installation with housing protection class IP54 and UL Type 1.