Siemens 6GK1503-3CC00 OLM/G12-1300 PROFIBUS Optical Link Module

Siemens 6GK1503-3CC00 PROFIBUS OLM/G12-1300 Optical Module

The Siemens 6GK1503-3CC00, also cataloged as the 6GK1503-3CC00 PROFIBUS Optical Link Module, operates as a dedicated hardware component for bidirectionally converting electrical RS-485 signals to 1300 nm optical signals within PROFIBUS DP and PA networks. Furthermore, the unit drives optical signal propagation across line, star, and redundant ring topologies while providing complete galvanic isolation. Consequently, this module prevents ground potential loops and suppresses electromagnetic interference across extended communication distances.

Hardware Specifications

Deterministic PROFIBUS Transmission and Bus Synchronization

Siemens OLM/G12-1300 modules maintain deterministic communication timing across PROFIBUS DP and PA network segments. By handling protocol conversion at the physical layer without introducing variable frame latencies, the hardware preserves strict master-slave cycle times. In addition, integrated firmware compatibility ensures seamless interaction with PROFIBUS bus masters, allowing predictable real-time data exchange across optical ring structures. When a cable fault occurs in a redundant optical ring topology, the internal switching logic re-routes signal traffic within a deterministic timeframe to maintain continuous bus communication.

Frequently Asked Questions

Q: How does the integrated analog test port assist in optical link measurement?

A: The test port provides a direct DC voltage output proportional to the received optical power level, enabling engineers to evaluate fiber attenuation using a standard voltmeter without interrupting active bus traffic.

Q: What occurs during a primary power supply interruption when using redundant supply terminals?

A: The module seamlessly shifts load execution to the secondary 24 VDC supply terminal without dropping network frames or triggering bus reset conditions. Simultaneously, the internal signaling contact toggles to alert the control system of the power channel failure.

Q: Does changing the PROFIBUS transmission speed require manual DIP switch re-configuration on the module?

A: No, the module features automatic baud rate detection across the full range from 9.6 kbit/s to 12 Mbit/s, eliminating the need for manual configuration when modifying network communication speeds.

Field Installation Guidelines

Mount the module vertically onto a standard 35 mm DIN rail by hooking the top spring catch onto the rail and pressing the lower housing firmly until the latch snaps into place. Verify that the cabinet layout maintains a minimum clearance of 50 mm above and below the housing to permit unhindered convective air cooling through the ventilation slots.

When routing optical fiber cables, observe the minimum bending radius limits specified for glass fiber media to prevent signal attenuation and physical core fracture. Clean all BFOC optical connectors with lint-free isopropyl alcohol wipes prior to mating with the optical ports. Furthermore, ground the RS-485 cable shield at the designated grounding terminal using a low-impedance connection, and route signal cables in separate cable trays away from high-voltage AC power wiring to prevent noise coupling.