Description
SST-SR4-CLX is a ControlLogix SST PROFIBUS DP Master Communication Module
Product Title & Description
Model: SST-SR4-CLX The SST-SR4-CLX is a ControlLogix SST PROFIBUS DP Master Communication Module, manufactured by Molex (formerly Woodhead / SST). It plugs into Allen‑Bradley ControlLogix 1756 chassis, acting as PROFIBUS DP master interface, enabling seamless data exchange between ControlLogix PLC and PROFIBUS DP slave devices. Widely used in petrochemical, power, metallurgy, packaging and material handling automation systems to connect variable frequency drives, remote I/O, encoders and field instruments over PROFIBUS DP.
Core Product Overview
SST-SR4-CLX is a 1756 form-factor single-slot PROFIBUS DP master module for Rockwell ControlLogix platform. It offloads PROFIBUS protocol processing from the 1756 controller, communicating with the ControlLogix backplane and managing the PROFIBUS DP bus independently. It supports up to 124 PROFIBUS DP slave nodes, cyclic I/O data exchange, slave diagnostics, bus fault monitoring and alarm reporting. Configuration is completed via SST Profibus Configuration Tool, then the configured data is mapped to ControlLogix tag space for reading/writing in Studio 5000 (RSLogix5000). Commonly paired with 1756-L73 /1756-L72 /1756-L71 ControlLogix processors to add PROFIBUS DP capability to Rockwell PLC systems.
SST-SR4-CLX
Main Technical Specifications
- Manufacturer: Molex (SST / Woodhead)
- Part Number: SST-SR4-CLX
- Product Type: PROFIBUS DP Master Module for ControlLogix (1756 chassis)
- Chassis: Allen‑Bradley 1756 ControlLogix rack
- Slot: Single slot
- PROFIBUS Standard: EN 50170, PROFIBUS DP V0/V1
- Max Slave Nodes: 124 slaves
- Baud Rate: 9.6 kbps ~ 12 Mbps
- Backplane Interface: ControlLogix backplane
- Programming Tool: SST Profibus Configuration Software
- PLC Software: Studio 5000 / RSLogix 5000
- Power Consumption: 1.7W max from ControlLogix backplane
- Operating Temperature: 0°C ~ +60°C
- Storage Temperature: -40°C ~ +85°C
- Relative Humidity: 5%~95%, non-condensing
- Protection: IP20 (for cabinet installation)
- Certifications: CE, UL, cUL
Quality Control Procedures
Molex SST communication modules comply with ISO9001 and PROFIBUS conformance standards.
- Incoming Component Inspection: Communication chips, transceivers, PCBs and connectors screened from approved suppliers.
- Automated Assembly & Serial Traceability: SMT assembly. Unique serial number for full lifecycle traceability.
- Full Functional Test: Backplane communication test, PROFIBUS baud rate test, slave simulation, cyclic data exchange and diagnostic function test.
- Environmental Stress Screening: Thermal cycling, vibration, EMC surge testing for industrial cabinet environments.
- Final Inspection & Packing: Visual inspection, anti-static packaging and factory test documentation included.
SST-SR4-CLX
Brand Related Model Recommendations
- SST-PB3-CLX: Older generation PROFIBUS DP master module for ControlLogix, legacy replacement reference.
- SST-SR4-CLX-RLL: Reduced version variant.
- 1756-EN2T: EtherNet/IP module for ControlLogix, used alongside .
- 1756-L73: ControlLogix CPU processor commonly matched with this PROFIBUS module.
Frequently Asked Questions (FAQ)
Q1: What PLC platform is used for? A1: Allen‑Bradley ControlLogix 1756 chassis, works with 1756-L7x, L6x series processors.
Q2: Is it PROFIBUS Master or Slave? A2: PROFIBUS DP Master, it controls the PROFIBUS bus and communicates with DP slave devices.
Q3: What software configures this module? A3: SST PROFIBUS configuration tool for bus topology and slave setup; Studio5000 for ControlLogix tag mapping.
Q4: Can it be hot-swapped? A4: It supports RIUP (Remove/Insert Under Power) on compatible ControlLogix chassis and firmware versions.
Q5: What is the warranty for original ? A5: Original Molex SST module carries standard 12-month factory warranty against manufacturing defects under proper installation and operation.
Installation & Configuration Guide
7.1 Pre-installation Preparation
Verify module, inspect backplane connector and PROFIBUS port. Prepare 1756 ControlLogix chassis, ControlLogix CPU (such as 1756-L73), PROFIBUS shielded cable, bus terminators, SST configuration software and Studio5000. Power off chassis before installation and use ESD protection.
7.2 Installation Steps
Insert into an empty slot of 1756 chassis and lock the module. Wire PROFIBUS DP shielded twisted pair cable to the PROFIBUS port. Install 120Ω bus terminator at both physical ends of PROFIBUS bus. Cable shield single-point grounding inside control cabinet. Check backplane connection, ensure no mechanical damage.
7.3 System Configuration & Commissioning
Launch SST PROFIBUS configuration software, create project, add all PROFIBUS DP slave devices, set baud rate and I/O mapping. Download configuration into module. Open Studio5000, add to hardware tree, map PROFIBUS I/O data to ControlLogix controller tags. Power up chassis, check module status LED. Perform offline bus simulation first, then field test with slaves online. Verify cyclic data read/write and slave diagnostic alarms. Save configuration files and commissioning logs.
7.4 Maintenance & Precautions
During shutdown outages, inspect PROFIBUS cable integrity, terminator status and cabinet temperature. Keep module and connectors clean. Do not use non-PROFIBUS cable. If bus communication loss occurs, check bus terminator, cable shielding, baud rate consistency and slave power before replacing the module.
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