Description
Molex SST 5136-PFB-PCI | PROFIBUS DP Master PCI Interface Card
Product Introduction
When a modern industrial PC or HMI workstation requires deterministic communication with PROFIBUS DP field devices, running software stacks directly on the host operating system CPU causes unacceptable latency and dropped packets. The Molex SST 5136-PFB-PCI is not an ordinary office network card; it is a dedicated industrial co-processor board built specifically for universal PCI slots. It acts as an intelligent hardware bridge that handles demanding PROFIBUS protocol execution independently.
Engineered with an onboard 32-bit microprocessor and dual-port RAM, this card executes time-critical master/slave token-passing and cyclic I/O data exchanges locally without burdening the host processor. It handles severe industrial environments—withstanding standard ambient panel operating thresholds—while delivering 500V optical isolation on the RS-485 transceiver port. Featuring a universal PCI edge connector compatible with both legacy 5V and modern 3.3V motherboard slots, this card slides straight into your industrial IPC chassis.
5136-PFB-PCI
Key Technical Specifications
| Parameter | Specification Metric |
| Device Category | PROFIBUS DP Master / Slave Universal PCI Network Interface Card (NIC) |
| Bus Architecture | Universal PCI bus interface (Supports both 5V and 3.3V signaling slots) |
| Onboard Processing | Dedicated 32-bit microprocessor with high-speed dual-port RAM |
| Network Physical Layer | Optically isolated RS-485 transceiver (PROFIBUS DP/FMS compliant) |
| Baud Rate Support | Automatic baud rate detection from 9.6 kbaud up to 12.0 Mbaud |
| Network Connector | Standard 9-pin D-sub female (DB-9F) connector |
| Isolation Voltage | 500 V RMS optical and galvanic port isolation |
| Operating Temperature | 0^\circC to +50^\circC standard industrial tier |
| Power Requirements | Powered via host PCI slot rails |
Application Scenarios & Pain Points
- Industrial PC-Based SCADA and HMI Workstations: Plant monitoring computers requiring direct deterministic access to PROFIBUS remote I/O drops rely on the 5136-PFB-PCI to offload heavy bus-polling loops, eliminating screen freezing and command lag.
- Automotive Robotic Assembly Cells: Multi-vendor manufacturing lines use PROFIBUS networks to coordinate high-speed servo drives and safety controllers. This interface card ensures robust data throughput and fast network recovery during high-vibration duty cycles.
- Specialized Quality Control Test Stands: Custom laboratory testing rigs running Windows-based inspection software need stable communication with complex field machinery. The board’s onboard processor guarantees real-time master execution independent of host OS background tasks.
QA & Live Testing SOP (Trust Signal)
We don’t warehouse legacy communication cards without verifying their bus performance and protocol execution health; every 5136-PFB-PCI unit goes through our rigorous bench protocol:
- Visual & Gold Finger Audit: Inspected under optical magnification for gold-finger trace cleanliness across the universal slot keyways, surface-mount component stability, and complete absence of corrosion or solder wear.
- Dynamic Universal PCI Slot Insertion: Slotted into an active industrial PC test motherboard to verify clean backplane power handshakes, Plug-and-Play BIOS resource allocation, and dual-port RAM read/write stability.
- PROFIBUS Network Loopback Verification: Connected to a calibrated PROFIBUS analyzer to confirm auto-baud detection across speeds up to 12 Mbaud, token-passing integrity, and zero frame errors under active polling.
- Protective Packaging: Sealed inside heavy-duty anti-static shielding bags and suspended securely within high-density structural foam to prevent transit vibration damage.
Field Engineer’s Pitfall Guide
- ❗ PROFIBUS Network Termination: Ensure both physical ends of your PROFIBUS cable trunk feature active terminating resistors. Powering down a terminated drop box while the network is active will drop the bus token and crash communication.
- ❗ DB-9 Pinout Conventions: Remember that PROFIBUS uses standard pins 3 (RxD/TxD-P) and 8 (RxD/TxD-N) on the DB-9 connector; miswiring custom drop cables will prevent the transceiver from establishing a link.
- ❗ Driver and Operating System Compatibility: Moving to newer 64-bit Windows environments requires corresponding SST/Molex driver DLLs and configuration packages; always verify software compatibility before installation.
Intent-Driven FAQ
Is the Molex 5136-PFB-PCI compatible with both Master and Slave configurations?
Yes. The card is software-configurable to act either as a high-performance PROFIBUS DP Master controlling remote I/O drops or as a Slave node reporting to an upper-level DCS controller.
What does “Universal PCI” mean for motherboard compatibility?
The universal edge connector features dual keyway cutouts, allowing the card to physically and electrically seat into both older 5V PCI motherboards and newer 3.3V PCI bus slots safely.
What causes a red “Fault” or error status LED upon system boot?
An error status indicator typically points to a driver initialization failure, an unassigned configuration file, or an incorrect bus address assignment conflicting with active network parameters.
Can multiple 5136-PFB-PCI cards run in the same PC chassis?
Yes. You can install multiple interface cards in a single host industrial computer to manage separate PROFIBUS networks, provided your driver software and memory address allocations are configured independently.
What kind of warranty covers this surplus communication card?
Every unit is backed by our comprehensive replacement guarantee, supported by multi-point pre-shipment bench testing to ensure absolute backplane and network communication readiness.
