Siemens 6GK1503 Optical Link Modules – 6GK1503-2CC00

Technical Dossier

Product Details And Specifications

Siemens 6GK1503 Series Technical Notes

The Evolution of 6GK1503 Architecture

The 6GK1503 OLM family was introduced as part of Siemens' SINEC L2 and later PROFIBUS infrastructure portfolio. Early variants supported single-channel fiber connections with fixed baud rate detection. Subsequent generations introduced automatic baud rate detection (9.6 kbps to 12 Mbps), redundant ring topology support, and dual-channel fiber configurations for fault-tolerant loop architectures. The series spans three primary sub-families differentiated by fiber type and channel count:

• 6GK1503-2Cxxx — Plastic fiber (POF), short-range, cost-optimized segments up to 80 m per link.
• 6GK1503-3Cxxx — Glass fiber (GOF), medium-range segments up to 400 m per link.
• 6GK1503-4Cxxx — Glass fiber (GOF), long-range segments up to 3000 m per link.

Compatibility with legacy PROFIBUS DP masters (including Siemens S5, S7-300, S7-400 CPUs) and modern S7-1500 systems via DP/DP coupler configurations ensures the 6GK1503 series remains relevant across multi-generation plant architectures. The series is now in a mature/end-of-life phase for several variants; Siemens' current recommended successor platform is the SCALANCE X series for new installations. However, the 6GK1503 installed base remains extensive, and replacement modules continue to be sourced for maintenance and lifecycle extension programs.

6GK1503 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented 6GK1503 series range. Each module supports automatic baud rate detection across the full PROFIBUS DP speed range unless otherwise noted.

Plastic Fiber (POF) — Single Channel:

• 6GK1503-2CA00: OLM/P11 — 1× electrical port, 1× POF port, point-to-point or bus topology, up to 80 m fiber span.
• 6GK1503-2CB00: OLM/P12 — 1× electrical port, 2× POF ports, linear bus or redundant ring topology support.
• 6GK1503-2CC00: OLM/P12 V4.0 — 1× electrical RS-485 port, 2× POF fiber ports, enhanced diagnostics, ring topology, 9.6 kbps–12 Mbps auto baud.
• 6GK1503-2CD00: OLM/P22 — 2× electrical ports, 2× POF ports, dual-segment bridging with optical isolation.
• 6GK1503-2CE00: OLM/P22 EX — ATEX-rated variant for Zone 2 hazardous area installation, POF, dual electrical ports.

Glass Fiber (GOF) — Medium Range (up to 400 m):

• 6GK1503-3CA00: OLM/G11 — 1× electrical port, 1× GOF port, 62.5/125 µm multimode fiber, point-to-point.
• 6GK1503-3CB00: OLM/G12 — 1× electrical port, 2× GOF ports, ring or linear bus, multimode fiber.
• 6GK1503-3CC00: OLM/G12 EX — ATEX Zone 2 certified, 1× electrical, 2× GOF multimode ports.
• 6GK1503-3CD00: OLM/G22 — 2× electrical ports, 2× GOF ports, dual-segment optical bridge, multimode.
• 6GK1503-3CE00: OLM/G22 EX — ATEX Zone 2, dual electrical and dual GOF multimode ports for hazardous environments.

Glass Fiber (GOF) — Long Range (up to 3000 m):

• 6GK1503-4CA00: OLM/G11-1300 — 1× electrical port, 1× GOF port, 9/125 µm singlemode fiber, up to 3000 m.
• 6GK1503-4CB00: OLM/G12-1300 — 1× electrical port, 2× GOF singlemode ports, ring topology, long-haul.
• 6GK1503-4CC00: OLM/G12-1300 EX — ATEX Zone 2, singlemode GOF, ring topology, long-range hazardous area.
• 6GK1503-4CD00: OLM/G22-1300 — 2× electrical ports, 2× singlemode GOF ports, dual-segment long-range bridge.
• 6GK1503-4CE00: OLM/G22-1300 EX — ATEX Zone 2, dual electrical, dual singlemode GOF, maximum range configuration.

Quality Control for the 6GK1503 Range

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.