Siemens 6GK1503-3CB00 PROFIBUS OLM/G12 V4.0 Optical Link Module
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Product Information
The Siemens 6GK1503-3CB00 is a SIMATIC NET PROFIBUS OLM/G12 V4.0 optical link module designed to convert electrical RS-485 PROFIBUS interfaces into optical signals for long-distance industrial communication. Built for installation in control cabinets, this component features one 9-pin Sub-D RS-485 electrical port and two optical BFOC (ST) ports operating at an 860 nm wavelength. Housed in a compact IP40 enclosure, the unit provides complete electrical isolation against ground potential differences and heavy electromagnetic interference (EMI), making it well suited for process control, water treatment, automotive manufacturing, and power generation systems.
Network integration with the 6GK1503-3CB00 supports 50/125 µm and 62.5/125 µm glass multimode fiber optic cables, allowing communication spans up to 3,000 meters per optical link segment across PROFIBUS DP and FMS networks. Transmission rates ranging from 9.6 kbit/s to 12 Mbit/s are detected automatically by the hardware. Commissioning or replacing a module does not require software tools; network topologies such as line, star, tree, single optical ring, or self-healing redundant ring structures are selected directly using top-mounted hardware DIP switches. When installing a spare unit, technicians must replicate the switch positions from the existing device to ensure matching network settings. ABC Industrial Parts can assist maintenance teams with tested replacement modules to minimize production downtime during exchange.
For routine maintenance and rapid troubleshooting, the module provides comprehensive visual feedback through front-mounted multi-status LEDs for system power, RS-485 traffic on channel CH1, and link status on optical channels CH2 and CH3, along with a multi-color LED bargraph displaying optical receive signal margins. Technicians can measure precise optical receive levels between 0 and 5 V DC via integrated test sockets using a standard voltmeter without interrupting data transmission. An isolated floating signaling relay contact (rated up to 30 V DC / 1 A) provides automated fault indication to high-level controllers. When communication errors stem from internal electronic degradation rather than external cable or power faults, replacing the module or sourcing a tested exchange unit through ABC Industrial Parts provides a fast path back to full operational status.
Technical Specifications
| Manufacturer | Siemens |
| Part number | 6GK1503-3CB00 |
| Model / Type | PROFIBUS OLM/G12 V4.0 |
| Product family | SIMATIC NET |
| Component type | Optical Link Module |
| Supply voltage | 24 V DC (18 to 32 V DC) |
| Rated current | 0.2 A |
| RS-485 ports | 1 |
| Optical ports | 2 (BFOC / ST connectors) |
| Optical wavelength | 860 nm |
| Fiber optic cable compatibility | Glass multimode (50/125 µm and 62.5/125 µm) |
| Transmission rates | 9.6 kbit/s to 12 Mbit/s (Automatic detection) |
| Maximum transmission distance | 3,000 m per link |
| Protection rating | IP40 |
| Signaling relay contact rating | Max 30 V DC / 1 A (Floating contact) |
| Optical receive level test socket | 0 to 5 V DC |
Programming and Configuration
The Siemens 6GK1503-3CB00 module operates transparently within PROFIBUS networks, eliminating the need for dedicated software configuration tools or modifications to PLC application programs. Network structure parameters are set directly on the hardware via top-mounted DIP switches, enabling fast deployment and easy replacement without specialized engineering software.
The hardware DIP switches allow selection among multiple network topologies, including linear, star, tree, single optical ring, and self-healing redundant optical ring configurations. Automatic transmission rate detection spans from 9.6 kbit/s up to 12 Mbit/s, enabling seamless dynamic alignment with active PROFIBUS masters and slaves across SIMATIC S7-300, S7-400, and S7-1500 automation systems.
Communication and System Integration
Designed for high-availability industrial communications, the 6GK1503-3CB00 converts standard RS-485 fieldbus signals into optical signals over glass multimode fiber cables. The unit includes one 9-pin Sub-D connector for electrical RS-485 connections and two optical ports using BFOC (ST) connectors working at an 860 nm wavelength. It supports 50/125 µm and 62.5/125 µm fiber cables over lengths reaching 3,000 meters per segment.
The module is compatible with both PROFIBUS DP and PROFIBUS FMS network protocols. By providing complete galvanic isolation, it eliminates ground loop issues and delivers high electromagnetic interference (EMI) immunity across challenging industrial sites. When configured in a redundant ring topology, the module ensures uninterrupted operation in the event of a fiber optic line break.
Diagnostics and Status Indication
The SIMATIC NET 6GK1503-3CB00 features built-in visual and electrical diagnostics for preventative maintenance and fault identification. Front-panel status LEDs indicate power state, RS-485 channel error conditions, and optical link health across channels CH2 and CH3. A multi-color bargraph LED display gives continuous visual indication of the optical receive signal strength margin.
For maintenance testing, the module includes integrated test sockets that output a 0 to 5 V DC signal corresponding to optical receive power levels. Technicians can measure this voltage using a standard voltmeter without breaking the optical link or stopping network traffic. An isolated floating signaling contact (max 30 V DC / 1 A) provides automatic alarm output to external supervisory systems when faults or power loss occur.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| SYSTEM | Green/Red - Multi-status | Indicates module power and system operational status or internal failure |
| CH1 | Green/Red - Multi-status | Indicates electrical RS-485 channel status and traffic error detection |
| CH2 | Green/Yellow/Red - Multi-status | Indicates optical channel 2 signal level, link health, and line faults |
| CH3 | Green/Yellow/Red - Multi-status | Indicates optical channel 3 signal level, link health, and line faults |
| Level LEDs / Bargraph | Multi-color - Bargraph display | Displays optical receiving signal strength margin |
Replacement and Spare Part Considerations
When replacing an existing 6GK1503-3CB00 module, ensure that the part number and hardware version match the installed device. Set the top-mounted DIP switches on the new module to identical positions as the original unit to retain the intended network topology, such as single ring, redundant ring, or linear layout.
Connect the dual redundant 24 V DC power supply terminals (accepting 18 to 32 V DC) and verify supply stability before powering up. Inspect and clean all BFOC (ST) fiber optic connectors prior to plugging into optical channels CH2 and CH3. Once connected, confirm optical link health via the front bargraph display or by checking the receive voltage (0 to 5 V DC) at the front test sockets.
Frequently Asked Questions
What fiber optic cables are compatible with the Siemens 6GK1503-3CB00?
The module is designed for glass multimode fiber optic cables with 50/125 µm or 62.5/125 µm core diameters fitted with BFOC (ST) connectors, operating at an 860 nm wavelength over distances up to 3,000 meters per link.
Is software or PLC configuration required to install the module?
No software tools or PLC program modifications are required. Transmission speeds from 9.6 kbit/s to 12 Mbit/s are auto-detected, and network topologies are configured directly using top-mounted hardware DIP switches.
How can optical signal power be tested on the module?
Optical receive signal margin can be checked visually via the front LED bargraph or measured numerically (0 to 5 V DC) at the built-in test sockets using a standard voltmeter without interrupting line operation.
What network topologies can be built with the PROFIBUS OLM/G12 V4.0?
The module supports linear, star, tree, single optical ring, and self-healing redundant optical ring network topologies.
What is the acceptable supply voltage range for the 6GK1503-3CB00?
The unit operates on a nominal 24 V DC supply with an allowable input voltage range of 18 V DC to 32 V DC, supported by dual redundant power input terminals.
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Disclaimer:
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