Siemens 6GK1503-2CB00 Automation Connection Component. Siemens 6GK1503-2CB00 is the exact manufacturer order number for a automation connection component in the SIMATIC NET PC Communication portfolio. Siemens describes this exact reference as: PROFIBUS OLM/G11 V4.0 optical link module with 1 RS 485 and 1 glass fiber optic cable interface (2 BFOC sockets), with signaling contact and test port. The verified manufacturer lifecycle record is PM300: Active Product.