SST / Woodhead (Molex) SST-SR4-CLX

Product Details

SST-SR4-CLX Product Description

The SST-SR4-CLX is a high-performance serial communication interface module engineered for Allen-Bradley ControlLogix (CLX) backplane environments. Designed by SST / Woodhead (Molex), this module delivers reliable multi-protocol serial connectivity — supporting RS-232, RS-422, and RS-485 — while enabling energy-aware data acquisition and load-optimized communication cycles across demanding industrial production lines. By consolidating serial device integration directly into the ControlLogix chassis, the SST-SR4-CLX eliminates the need for external serial converters, reducing auxiliary power draw and simplifying the overall control architecture.

Every unit is QA-tested prior to shipment, backed by a 12-month warranty, and available from in-stock inventory to support rapid project deployment and minimal downtime exposure.

In modern smart production environments, every communication node contributes to the overall energy footprint of the control system. The SST-SR4-CLX integrates directly into the Allen-Bradley 1756 ControlLogix backplane, sharing the chassis power supply with other 1756-series modules — eliminating the need for dedicated external power adapters or standalone serial converters that introduce unnecessary standby consumption.

When paired with a 1756-L73 or 1756-L85E ControlLogix CPU, the SST-SR4-CLX enables the PLC to poll serial field devices — such as energy meters, flow controllers, and legacy SCADA-connected instruments — at precisely scheduled intervals, reducing unnecessary polling cycles and the associated processing load. This tightly coupled architecture supports deterministic communication timing, which is essential for production line beat optimization.

For drive-intensive lines, the module facilitates serial command and status feedback loops between the ControlLogix controller and PowerFlex 525 or PowerFlex 755 variable frequency drives, enabling the PLC to dynamically adjust motor speed references based on real-time load conditions — a key lever for reducing motor energy consumption during partial-load production phases.

Integration with 1756-IB16 and 1756-OB16 digital I/O modules within the same chassis allows the SST-SR4-CLX to coordinate serial device state changes with discrete I/O events, enabling synchronized start/stop sequences that prevent inrush current spikes and reduce thermal stress on connected equipment. Alongside 1756-EN2T EtherNet/IP communication modules, the SST-SR4-CLX bridges legacy serial field instruments into the broader Ethernet-based control network, feeding real-time energy and process data to FactoryTalk View SE HMI dashboards for operator visibility and energy KPI tracking.

For power monitoring applications, the SST-SR4-CLX can interface with PowerMonitor 5000 or ION7650 power quality meters via RS-485 Modbus RTU, streaming demand, power factor, and harmonic data directly into the ControlLogix tag database — enabling the PLC to execute load-shedding logic or demand response routines without requiring a separate energy management gateway. This architecture reduces both hardware cost and the idle power draw of intermediate communication devices.

In process environments where Kinetix 5700 servo drives manage precision motion axes, the SST-SR4-CLX handles auxiliary serial communications — such as barcode readers, vision system triggers, or weighing terminals — freeing the EtherNet/IP network bandwidth for time-critical motion and safety data. This separation of communication layers reduces network congestion and improves overall system determinism, directly contributing to tighter production line cycle times.

Factory energy optimization is no longer limited to drive efficiency or lighting upgrades — it extends to every layer of the control architecture, including communication infrastructure. The SST-SR4-CLX contributes to line-level energy optimization by enabling the ControlLogix PLC to maintain continuous, low-latency serial communication with field instruments without relying on energy-inefficient external serial servers or USB-to-serial adapters that lack industrial-grade power management.

By consolidating four independent serial channels into a single backplane module, the SST-SR4-CLX reduces the number of powered devices in the control panel, lowering the aggregate heat load within the enclosure. This directly reduces the duty cycle of panel cooling systems — a frequently overlooked source of auxiliary energy consumption in large automation installations. Lower enclosure temperatures also extend the service life of adjacent modules, reducing replacement frequency and associated maintenance downtime.

For predictive maintenance strategies, the module's reliable serial connectivity ensures that condition monitoring sensors — vibration transmitters, temperature probes, and ultrasonic flow meters — maintain uninterrupted data streams to the ControlLogix controller. Continuous sensor data enables the PLC to detect early-stage equipment degradation, schedule maintenance during planned downtime windows, and avoid unplanned stoppages that disrupt production line throughput and waste energy through uncontrolled restart sequences.

The SST-SR4-CLX supports production line beat stabilization by ensuring that serial-connected devices — including legacy PLCs, operator terminals, and process instruments — respond within defined communication windows. Consistent response timing prevents the cascading delays that cause line stoppages, idle motor running, and unnecessary energy consumption during recovery sequences. Combined with ControlLogix's deterministic scan cycle, this module helps maintain the precise production rhythm that energy-efficient manufacturing demands.

All units are shipped from verified in-stock inventory, pre-tested under operational conditions, and covered by a 12-month warranty — ensuring that replacement or new-installation deployments can proceed without procurement delays that extend project timelines and increase carrying costs.

Q1: How does the SST-SR4-CLX contribute to energy savings in a ControlLogix system?By integrating four serial channels directly into the 1756 backplane, the SST-SR4-CLX eliminates external serial converters and their associated standby power draw. It also enables the ControlLogix PLC to implement scheduled polling and load-shedding logic for serial-connected energy meters and field instruments, reducing unnecessary communication overhead and associated processing energy.

Q2: Is the SST-SR4-CLX compatible with current ControlLogix platforms and Studio 5000?Yes. The SST-SR4-CLX is designed for Allen-Bradley ControlLogix 1756-series chassis and is compatible with Studio 5000 / RSLogix 5000 programming environments. It supports RS-232, RS-422, and RS-485 protocols, making it suitable for integration with a wide range of serial field devices including Modbus RTU instruments, legacy drives, and process controllers.

Q3: What is the recommended replacement or upgrade path for aging serial interface modules?For systems currently using older SST or third-party serial interface cards in ControlLogix chassis, the SST-SR4-CLX provides a direct form-fit replacement with equivalent or improved protocol support. Prior to installation, verify chassis slot availability and firmware compatibility with your ControlLogix CPU version. All replacement units are QA-tested before shipment.

Q4: What warranty and testing standards apply to this module?Every SST-SR4-CLX unit is covered by a 12-month warranty from the date of shipment. Units undergo functional testing prior to dispatch to verify serial port operation, backplane communication integrity, and protocol response. In-stock availability ensures same-day or next-day shipment for urgent production line requirements.