TSXDMZ28DR: Cost-Effective Relay I/O for TSX Micro PLCs
Downtime in a control cabinet often starts with a failed I/O base. When a discrete relay module stops switching, the whole line can stall. The Schneider Electric TSXDMZ28DR is a discrete relay I/O base built for the Modicon TSX Micro automation platform. It gives you 16 screw terminal inputs and normally open (NO) relay contacts in one compact unit. For maintenance teams, that means fewer spare part numbers on the shelf and faster swaps during a fault.
This base fits directly into TSX Micro PLC racks. It handles 24 V DC discrete input voltage with negative logic, as stated in the manufacturer data. The unit weighs 0.5 kg net, so it is light enough for single-person handling during replacement. Every spec on this page traces back to Schneider Electric documentation for this exact part number.
Key Parameters That Drive Your Cost per Point
16 Inputs on Screw Terminal Blocks
Sixteen discrete inputs on screw terminal blocks lower your cost per I/O point. You wire field devices directly to the base without extra terminal adapters. Fewer adapters mean lower material cost and less cabinet space. The screw terminals also speed up troubleshooting, because technicians can probe each point without special tools.
24 V DC Negative Logic Inputs
The data sheet lists 24 V DC discrete input voltage with negative logic. Input current is 9 mA, and input impedance is 4 Ohm. These values matter when you size sensor circuits. A 9 mA draw per point keeps load on your 24 V supply predictable. The input voltage limit is <= 8 V at state 1, and current limits are <= 1.5 mA at state 0 and >= 2.5 mA at state 1. Those thresholds tell you whether a sensor signal will register cleanly.
Wide Output Voltage Limits
Output voltage limits span 19 to 264 V AC and 10 to 34 V DC. That range lets one base drive AC contactors and DC loads without a separate interface relay. Power consumption ratings include 50 VA at 24 V AC-12 resistive and 220 VA at 220 V AC-12 resistive. For DC loads, the data lists 40 W at 24 V DC-12 resistive and 24 W at 24 V DC-13 inductive. Matching your load to these figures avoids overloading the contacts.
Isolation and Thermal Ratings
Isolation voltage is 1500 V for 1 second. That barrier protects low-voltage control circuits from field transients. The conventional free air thermal current [Ith] is 3 A. Power dissipation is 4.5 W, and current consumption is 160 mA positive and 131 mA negative. Lower dissipation means less heat inside the enclosure, which extends the life of nearby components.
Where the TSXDMZ28DR Earns Its Keep
Packaging and Material Handling
A conveyor diverter station often needs mixed AC and DC switching. The 19 to 264 V AC output range covers AC solenoid valves, while the 10 to 34 V DC range handles DC pilot devices. One base replaces two single-voltage modules, cutting spare parts inventory cost.
Water Treatment and Pump Control
Pump panels use proximity sensors for rotation monitoring. This base accepts 2-wire and 3-wire proximity sensors, so you can standardize sensor types across the plant. Standardization reduces training time and spare stock. The 1500 V isolation rating also adds a protection layer between field wiring and the PLC backplane.
Assembly and Test Cells
High-mix test cells change tooling often. The 0.1 to 7.5 ms input response time supports fast state changes on position sensors. Output response time is under 10 ms, which suits relay-based actuator control. Fast response keeps cycle times short, and short cycle times protect throughput revenue.
Installation and Setup Notes
Mount the base in the TSX Micro rack per Schneider Electric instructions. Keep field wiring separated from low-level signal cables to reduce noise. Use the screw terminal blocks for all 16 input points. Confirm your sensor type before wiring, because the base supports both 2-wire and 3-wire proximity sensors. Check that your load stays within the resistive or inductive ratings listed in the data. Do not exceed the stated output voltage limits. For safety-related functions, follow the manufacturer’s safety manual and inspect the module periodically.
Maintenance and Long-Term Reliability
Relay contacts are the main wear point. Inspect them on a schedule based on switching frequency. Heat shortens relay life, so keep cabinet temperature stable and confirm the 4.5 W dissipation fits your thermal budget. Check screw terminals for tightness during routine rounds. A loose terminal creates resistance, heat, and eventually a fault. Because this base covers both AC and DC loads, you can consolidate spares and reduce the cost of carrying multiple module types.
Compatibility and Integration
The TSXDMZ28DR belongs to the Modicon TSX Micro automation platform. It works as a discrete relay I/O base within that system. The data sheet does not list communication protocols for this module, so confirm network needs against your PLC CPU and rack configuration. Verify rack slot compatibility before ordering. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
What to Check Before You Buy
Confirm your input logic, sensor type, and load voltage against the specifications above. Check that 16 input points match your field device count. Verify the output voltage limits cover every load in your panel. Keep the 3 A thermal current rating in mind when grouping loads. SpareTechPLC supplies industrial automation parts and can help you match this base to your TSX Micro system. Ask about current stock before you commit to a purchase order.
Frequently Asked Questions
Does the TSXDMZ28DR support both AC and DC output loads?
Yes. The data sheet lists output voltage limits of 19 to 264 V AC and 10 to 34 V DC. This lets one base drive mixed load types.
How many discrete inputs does this base provide?
The unit provides 16 discrete inputs on screw terminal blocks. Each point accepts 24 V DC with negative logic.
What sensor types can I connect?
The base supports 2-wire and 3-wire proximity sensors. Confirm sensor current falls within the stated input current limits.
What is the isolation voltage rating?
Isolation voltage is 1500 V for 1 second. This protects control-side circuits from field transients.
Is this module still in production?
The data does not state lifecycle status. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
