SST SST-PB3-PCU – PROFIBUS DP Interface Module | SST Automation Platform
Engineering Background
PROFIBUS DP (Decentralized Periphery) remains one of the most widely deployed fieldbus protocols in process and discrete manufacturing environments worldwide. Designed to meet IEC 61158 and EN 50170 standards, PROFIBUS DP enables deterministic, high-speed communication between PLCs, DCS controllers, and distributed I/O nodes at data rates up to 12 Mbit/s. The SST-PB3-PCU was engineered by SST Automation to provide a cost-effective, high-reliability gateway between PC-based control platforms and PROFIBUS DP networks via the ISA bus architecture.
Product Positioning
The SST-PB3-PCU is a half-length ISA bus PROFIBUS DP interface card designed for integration into industrial PCs, embedded controllers, and legacy automation workstations. It supports both DP Master (Class 1 & Class 2) and DP Slave operating modes, making it suitable for both controller-side and device-side deployments. This module is the preferred choice for system integrators maintaining or upgrading PROFIBUS-based control architectures where ISA slot availability exists.
Complete Technical Specifications
- Part Number: SST-PB3-PCU
- Manufacturer: SST Automation (Woodhead / Molex legacy)
- Bus Interface: ISA (Industry Standard Architecture), half-length card
- Fieldbus Protocol: PROFIBUS DP (EN 50170 / IEC 61158)
- Operating Modes: DP Master Class 1, DP Master Class 2, DP Slave
- Data Transfer Rate: 9.6 kbit/s to 12 Mbit/s (auto-baud detection)
- Max DP Slaves (Master Mode): Up to 125 slave nodes
- Physical Interface: DB9 female connector (RS-485)
- Isolation: Optical isolation on PROFIBUS port
- Power Supply: Derived from ISA bus (+5 VDC)
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Humidity: 5% to 95% RH, non-condensing
- Weight: Approx. 120 g
- Certifications: CE, FCC Class A
- Software Support: Windows XP/7/10 drivers; SST Configuration Utility; OPC Server compatible
- GSD File: Available for slave mode configuration
Proven Application Environments
- Automotive assembly line PLC-to-I/O communication via PROFIBUS DP
- Chemical plant DCS integration with distributed field instruments
- Water treatment SCADA systems using PC-based PROFIBUS masters
- Pharmaceutical batch control with validated PROFIBUS networks
- Legacy system upgrades where ISA-slot industrial PCs remain in service
- OEM machine builders requiring embedded PROFIBUS master capability
- Test & measurement systems requiring deterministic fieldbus access
Engineering Advantages
- Dual-mode flexibility: Operates as DP Master or DP Slave without hardware modification — mode selected via software configuration.
- Auto-baud detection: Eliminates manual baud rate configuration; card synchronizes automatically to network speed.
- Optical isolation: Protects host PC from ground loops and transient voltages common in industrial environments.
- Low CPU overhead: Onboard microprocessor handles PROFIBUS protocol stack independently, offloading the host CPU.
- Broad OS support: Drivers available for Windows XP through Windows 10; Linux support via third-party wrappers.
- OPC compatibility: Works with SST OPC Server for seamless integration with SCADA and HMI platforms (Wonderware, iFIX, WinCC).
- Compact form factor: Half-length ISA card fits in space-constrained industrial PC chassis.
System Architecture & Signal Flow
The SST-PB3-PCU interfaces the host PC’s ISA bus to the PROFIBUS DP network through a three-stage architecture:
- Host Interface Layer: ISA bus logic handles memory-mapped I/O and interrupt signaling between the host CPU and the card’s onboard processor.
- Protocol Processing Layer: An embedded microcontroller executes the full PROFIBUS DP protocol stack (Layers 1 & 2), managing token passing, cyclic data exchange, and diagnostic messaging autonomously.
- Physical Layer: RS-485 transceiver with optical isolation drives the PROFIBUS cable segment. DB9 connector provides standard PROFIBUS pinout (Pin 3: B+, Pin 8: A−, Pin 5: GND, Pin 6: +5V termination supply).
Cyclic process data is exchanged between the host application and field devices via a dual-port RAM buffer, ensuring deterministic update rates independent of host CPU load.
Sourcing & Quality Verification
- Origin: Genuine SST Automation (Woodhead/Molex lineage) product; sourced through authorized industrial distribution channels.
- Condition: New (factory-sealed) and refurbished/tested units available — condition specified at time of quotation.
- Inspection: All units undergo functional verification including PROFIBUS communication test prior to shipment.
- Traceability: Serial number and date code recorded for each unit shipped.
- Packaging: Anti-static bag + foam-lined carton; compliant with IEC 61340-5-1 ESD protection standards.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
Procurement Process
- Confirm compatibility: Verify your host PC has an available ISA slot and your PROFIBUS network operates at DP protocol level.
- Request quotation: Contact support@konmask.com with quantity, required condition (new/refurbished), and delivery timeline.
- Order confirmation: Purchase order accepted via email; proforma invoice issued within 1 business day.
- Lead time: In-stock units ship within 3–5 business days; special orders 2–4 weeks.
- Shipping: DHL Express / FedEx International Priority; export documentation (commercial invoice, packing list, COO) provided.
- Payment: T/T bank transfer, PayPal, or Alibaba Trade Assurance accepted.
Technical FAQ
Q: Can the SST-PB3-PCU operate as both master and slave simultaneously?
A: No. The card operates in a single mode at a time (Master Class 1, Master Class 2, or Slave), selected during software initialization. Mode switching requires a software reset.
Q: Is the SST-PB3-PCU compatible with Windows 10 64-bit?
A: ISA bus cards require physical ISA slots, which are absent from modern motherboards. For Windows 10 environments, SST offers PCI and PCIe variants (SST-PB3-PCP, SST-PB3-PCIe). Confirm your hardware platform before ordering.
Q: What is the maximum cable length supported?
A: Per PROFIBUS DP specification, maximum segment length depends on baud rate: 1200 m at 9.6–187.5 kbit/s, 400 m at 500 kbit/s, 200 m at 1.5 Mbit/s, 100 m at 3–12 Mbit/s. Repeaters can extend total network length.
Q: Does Konmask provide the SST Configuration Utility software?
A: Yes. Software download links and license keys are provided with each unit shipment. Contact support for legacy driver versions.
Q: Can I get a test report or functional verification certificate?
A: Yes. A functional test report is available upon request at no additional charge for orders of 1+ units.
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