Configured for deterministic logic execution in Modicon TSX Micro automation platforms, the Schneider Electric TSX3721001 (TSX Micro 37 21/22 PLC configuration) provides direct physical and electrical control over discrete and analog process loops. It processes Boolean and floating-point arithmetic operations via integrated backplane communication.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Brand | Schneider Electric |
| Origin | France |
| Weight | 1.72 kg |
| Dimensions | 341.4 mm x 151 mm x 152 mm |
| Operating Temp | 0 to 60 degC |
| Storage Temp | -25 to 70 degC |
| Power Consumption | 16 W total useful secondary power |
| Primary Voltage | 100…240 V / 90…264 V AC |
| Input Current | 2 mA < 60 A |
| Output Current | 0.5 A |
| Memory (RAM) | 128 Kwords (with PCMCIA), 20 Kwords internal |
| Memory (Flash) | 15 Kwords |
| Execution Time | 0.13 us Boolean (no PCMCIA) / 0.19 us (with PCMCIA) |
| Communication | 1 x Modbus RTU (19.2 kbit/s), 1 x Uni-Telway (19.2 kbit/s) |
Backplane Bus Communication Velocity and Firmware Flash Compatibility
The module utilizes a proprietary backplane bus architecture to transfer data between the CPU and expansion modules. Execution velocity is contingent on firmware flash compatibility; installing a PCMCIA memory card increases floating-point REAL arithmetic performance to 4.5 us per instruction. The system supports 1 fast task, 1 master task, and 16 event tasks, with a fixed system overhead of 1.6 ms for the master task cycle.
Frequently Asked Questions
Q: What is the maximum allowable microbreak duration for the primary power supply?
A: The controller maintains operation through mains power interruptions lasting less than 20 ms without triggering a cold restart or losing volatile RAM data.
Q: Does the integrated real-time clock require a backup battery for data retention?
A: Yes, the internal RAM relies on a lithium battery to retain data during power loss; the real-time clock function also requires this power source to maintain timestamp accuracy.
Q: Are the communication ports galvanically isolated from the internal logic?
A: No, the TER/AUX serial links share a common ground reference with the main CPU logic; external isolation must be implemented at the field wiring interface to suppress ground loop currents.
Field Installation Guidelines
Mount the unit on a standard 35 mm DIN rail or directly to a flat panel using the provided screw slots. Ensure adequate clearance for heat dissipation, maintaining a minimum spacing of 50 mm from adjacent high-power devices. Terminate all shielded communication cables with 360-degree contact to the enclosure ground point to mitigate EMI susceptibility as defined by IEC 61131-2. Torque terminal screws to 0.5 Nm to prevent thermal resistance at the connection points.
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