Siemens 6GK1503-2CC00 SIMATIC NET PROFIBUS Optical Link Module (OLM/G11-1300)

Overview

The Siemens 6GK1503-2CC00 is a SIMATIC NET PROFIBUS Optical Link Module, designated OLM/G11-1300 V4.0, used to extend and electrically isolate PROFIBUS DP/FMS network segments over glass fiber-optic cable. It combines one RS-485 electrical PROFIBUS port with one glass fiber-optic interface (two BFOC/ST sockets) operating at a 1310 nm wavelength (OLM “-1300” designation), enabling long-distance, interference-free PROFIBUS links between control rooms, remote I/O, and field equipment across large industrial sites.

Seven Star LLC supplies the genuine Siemens 6GK1503-2CC00 SIMATIC NET Optical Link Module to automation integrators and plant maintenance teams across Oman and the GCC. As a partner sourcing authentic Siemens SIMATIC NET industrial communication products, Seven Star supports refinery, petrochemical, and manufacturing customers in Muscat, Sohar, and Duqm with genuine OLM modules, PROFIBUS network design guidance, and spares for existing SIMATIC NET fiber-optic ring and line topologies.

Measurement and Operating Principle

The Siemens 6GK1503-2CC00 operates as a signal converter and repeater within a PROFIBUS network: PROFIBUS telegrams arriving on its RS-485 electrical interface are converted to optical pulses and transmitted over glass fiber, while optical signals received from the fiber side are converted back to RS-485 electrical signals. This opto-electrical conversion galvanically isolates the connected network segments, eliminating ground-loop and lightning-induced disturbances that are common when running long copper PROFIBUS cables across a large industrial plant, refinery, or outdoor tank farm.

Because the module operates at the physical layer, it is transparent to the PROFIBUS protocol and supports the full range of standard PROFIBUS baud rates, automatically adapting to the network’s configured transmission speed. A built-in signaling contact provides remote fault indication (e.g., loss of a fiber link) back to a control system, and a dedicated measuring/test port allows technicians to verify signal levels and diagnose link quality without interrupting live network traffic — a significant advantage during commissioning and troubleshooting of extended fiber-optic PROFIBUS lines.

Engineering Design

Mechanically, the Siemens 6GK1503-2CC00 is housed in a compact, robust enclosure suitable for wall or DIN-rail mounting inside a control cabinet, with a 9-pin D-Sub connector for the RS-485 PROFIBUS side, two BFOC/ST fiber-optic sockets, and dedicated terminals for the 24 VDC nominal power supply (permitted range 18–32 VDC, NEC Class 2), signaling contact, and test output. The 1310 nm wavelength optics extend usable link distances considerably further than short-wavelength (860 nm) OLM variants, making the G11-1300 the preferred choice for inter-building or long-run PROFIBUS fiber links across large process plants.

As part of the SIMATIC NET OLM family, the Siemens 6GK1503-2CC00 is designed to be combined with other OLM units to build fiber-optic ring, line, or star network topologies with redundancy, so that a single fiber break does not take down the entire PROFIBUS segment. Its rugged industrial design supports the vibration, temperature, and EMC conditions typical of process plant control rooms and field junction boxes across Oman’s industrial zones.

Siemens 6GK1503-2CC00 Key Features

• SIMATIC NET PROFIBUS Optical Link Module, type OLM/G11-1300 V4.0
• One RS-485 PROFIBUS port plus one glass fiber-optic interface with two BFOC/ST sockets
• 1310 nm wavelength optics for extended fiber-optic transmission distances
• Galvanic isolation between electrical and optical network segments
• Built-in signaling contact for remote fault/link-status indication
• Dedicated test/measuring port for non-intrusive signal quality diagnostics
• 24 VDC nominal supply (permitted range 18–32 VDC), wall or DIN-rail mounting
• Supports redundant ring, line, and star PROFIBUS fiber-optic network topologies

Industrial Applications

The Siemens 6GK1503-2CC00 is specified wherever a PROFIBUS network must span long distances, cross buildings, or operate in electrically noisy environments — typical of refineries, petrochemical plants, power generation facilities, and large manufacturing sites where copper PROFIBUS cable runs would be vulnerable to EMI, lightning induction, or ground potential differences. It is commonly deployed to link remote I/O stations, motor control centers, and field instrumentation back to a central DCS or PLC over fiber-optic backbone cabling.

Seven Star LLC supports oil and gas, petrochemical, and power generation customers across Oman — including Muscat, Sohar, and Salalah — with genuine Siemens SIMATIC NET 6GK1503-2CC00 optical link modules for new PROFIBUS network builds, brownfield network extensions, and replacement of failed OLM units in existing plant fiber-optic PROFIBUS infrastructure.

Siemens 6GK1503-2CC00 Technical Specifications

Optical Budget and Transmission Distance

The practical reach of the Siemens 6GK1503-2CC00 depends on which glass fiber is installed. Siemens publishes a range of 0 to 15 km over single-mode E 10/125 fiber (rated 0.5 dB/km) and 0 to 10 km over G 50/125 or G 62.5/125 multimode fiber, and states explicitly that these distances between two OLMs may not be exceeded regardless of the optical power budget. The supporting optical figures are an injected power of -19 dBm into E 10/125 and -17 dBm into either multimode fiber, a receiver sensitivity of -29 dBm and a receiver overdrive limit of -3 dBm — which means very short fiber runs between two 1310 nm modules can overdrive the receiver and require attenuation rather than the amplification engineers usually assume.

A related rule catches out mixed installations: only OLMs of the same wavelength may be optically connected to each other, so an OLM/G11-1300 links to another OLM/G11-1300 or to an OLM/G12-1300, never to an 860 nm OLM/G11 or OLM/G12. Siemens also specifies minimum slot times that must be maintained on the 1300 nm modules at 1.5, 3, 6 and 12 Mbps — a bus parameter worth checking in the master configuration before commissioning a long fiber segment.

Electrical, Environmental and Diagnostic Data

Signal transmission covers 9.6, 19.2, 45.45, 93.75, 187.5 and 500 kbps plus 1.5, 3, 6 and 12 Mbps, with the transmission rate set automatically rather than by DIL switch. Current consumption is a maximum of 200 mA, and the RS-485 D-sub jack supplies 5 V DC (+5/-10%) on pin 6 for bus termination. The floating signalling contact opens on error and is rated to a maximum of 50 V DC / 30 V AC and 1.0 A under CE, or 30 V DC / 30 V AC under cULus.

Environmentally, the module is rated for 0 °C to +60 °C in operation and -40 °C to +70 °C for storage and transport, with relative humidity below 95% non-condensing. The degree of protection is IP40 and the housing is stainless steel 1.4016, so the OLM is intended for mounting inside a control cabinet rather than direct field exposure — a point worth confirming on outdoor installations in Omani plant environments, where Siemens recommends a cabinet of at least IP54.

Request a Quote

Contact Seven Star LLC for pricing, lead time, and availability on the genuine Siemens 6GK1503-2CC00 SIMATIC NET Optical Link Module in Oman. Our engineering team can help design your PROFIBUS fiber-optic network topology and specify the correct OLM combination for your site.

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