TSX3721001 Controller Module: A Practical Replacement Path for Legacy TSX Micro Systems
Downtime on a mature production line often traces back to a single controller that is no longer stocked locally. The Schneider Electric TSX3721001 controller module from the TSX Micro PLCs series gives maintenance teams a direct replacement option for existing installations. It combines a real-time clock, three integration slots, and dual serial communication in one compact modular base controller.
What This Controller Delivers
The TSX3721001 is a modular base controller designed for the Modicon TSX Micro automation platform. Its real-time clock supports time-stamped events and scheduling logic without external hardware. The module accepts 100-240 V AC primary voltage across a 90-264 V AC range, so it fits common industrial supply configurations.
Three slots allow you to populate the base with the I/O and function modules your application already uses. Integrated communication covers one serial link (TER/AUX) running Uni-Telway at 19.2 kbit/s and one Modbus RTU link at 19.2 kbit/s. That dual-protocol setup simplifies integration with existing HMI panels, drives, and supervisory systems.
Technical Specifications That Matter
Memory architecture separates program, data, and constant storage. Internal RAM provides 20 Kwords for data, while a PCMCIA card expands program and data capacity to 128 Kwords. Flash memory holds 15 Kwords of data. Object areas support up to 256 %Mi, 1 %MWi for internal words, and 128 %KWi for constant words.
Execution speed depends on configuration. Without a PCMCIA card, 1 K instructions of 100% Boolean logic run in 5.88 ms. With a card, that drops to 4 ms. Mixed Boolean and numerical tasks complete in 0.27 ms without a card and 0.266 ms with one. Per-instruction times are 0.13 µs Boolean and 4.5 µs arithmetic REAL floating, with or without the card.
The application structure includes one fast task, one master task, and up to 16 event tasks. Master task system overhead is 1.6 ms. Protection covers overload and short-circuit conditions. Total useful secondary power is 16 W, and output current is rated at 0.5 A.
Environmental and Physical Profile
Operating temperature spans 32…140 °F (0…60 °C), with storage from -13…158 °F (-25…70 °C). Relative humidity for operation is 10…95 % without condensation, and operating altitude reaches 0…2000 m. The unit measures 13.4 in (341.4 mm) wide, 5.9 in (151 mm) high, and 6.0 in (152 mm) deep, with a net weight of 3.79 lb (1.72 kg).
Where the TSX3721001 Fits
This controller suits replacement and upgrade projects on packaging lines, material handling systems, and small process skids. A food processing plant running a TSX Micro platform can swap in the TSX3721001 to restore real-time clock functions and Modbus RTU communication without redesigning the control cabinet. Water treatment facilities using Uni-Telway devices benefit from the integrated serial link at 19.2 kbit/s.
Installation and Setup Guidance
Mount the module in the existing TSX Micro rack position and confirm the supply falls within the 90-264 V AC range. Verify that microbreaks stay under 20 ms for uninterrupted operation. Populate the three slots with the I/O modules from your original configuration. Connect the TER/AUX port for Uni-Telway devices and the Modbus port for RTU networks. Confirm that ambient conditions remain inside the rated 0…60 °C window before powering the system.
Maintenance and Reliability Considerations
Inspect the module periodically for dust accumulation and secure seating in the rack. Check that cabinet ventilation maintains the operating temperature range. The real-time clock may require attention over long service intervals. Because the unit includes overload and short-circuit protection, verify that connected loads stay within the 0.5 A output current rating. Follow the manufacturer’s safety manual for all service activities.
Compatibility and Integration Notes
The TSX3721001 integrates with the Modicon TSX Micro automation platform. Its Uni-Telway and Modbus RTU ports connect to existing supervisory systems and operator panels. The PCMCIA card option expands memory for larger programs. Confirm firmware and module compatibility with your current rack configuration before ordering.
Selection Checklist Before You Buy
Verify your existing rack accepts the TSX Micro series. Confirm voltage supply, slot count, and communication protocol match your system. Check whether your application needs the PCMCIA card for expanded memory. Contact SpareTechPLC to verify current lifecycle status and availability before placing an order.
Frequently Asked Questions
Does the TSX3721001 include a real-time clock?
Yes. The module ships with a real-time clock for time-stamped logic and scheduling.
What communication protocols does it support?
It provides one Uni-Telway serial link at 19.2 kbit/s and one Modbus RTU link at 19.2 kbit/s.
Can I expand memory beyond the internal RAM?
Yes. A PCMCIA card expands program and data storage to 128 Kwords.
What is the operating temperature range?
The module operates from 32…140 °F (0…60 °C) and stores from -13…158 °F (-25…70 °C).
How many slots does the base controller have?
It has three integration slots for I/O and function modules.
