Description
Product Introduction
The Schneider Electric Modicon 140ESI06210 is a dual-port ASCII serial interface module designed for the Modicon Quantum PLC platform. It allows Quantum controllers to exchange raw ASCII characters and formatted serial streams with peripheral field devices without overloading the main CPU processor.
Featuring two independent, optically isolated RS-232C serial channels, the 140ESI06210 manages character buffer framing, checksum validation, and serial data transmission. It is essential for interfacing non-networked industrial peripherals—such as barcode scanners, industrial scales, label printers, and RFID readers—directly into the Quantum PLC memory structure.
Key Technical Specifications
| Parameter | Specification Details |
| Module Type | ASCII Serial Link Communication Module |
| Part Number | 140ESI06210 |
| Manufacturer | Schneider Electric / Modicon |
| Platform Compatibility | Modicon Quantum Local & Remote Racks |
| Serial Ports | 2 x RS-232C Serial Ports (RJ45 / 9-pin configuration) |
| Baud Rates | 300 to 19,200 bps (configurable per port) |
| Protocol Support | ASCII Read/Write, Character Framing, Custom Serial Protocols |
| Buffer Memory | Dual internal receive/transmit FIFO buffers |
| Isolation Rating | 500 VDC Port-to-Backplane & Port-to-Port Isolation |
| Bus Current Requirement | ~250 mA max at 5.1V DC (from backplane) |
| Diagnostics | Active, Ready, Port 1 Tx/Rx, Port 2 Tx/Rx, Fault LEDs |
Application Scenarios & Field Experience
The 140ESI06210 is widely used in material handling, packaging, and process monitoring environments where peripheral serial data must feed into PLC batch logic.
- Warehouse & Logistics Conveyors: Parsing scanned ASCII barcodes from inline laser scanners to route packages across diverters.
- Batching & Weighing Systems: Reading gross/tare weight data over RS-232 from floor scales and hopper load cell transmitters.
- Industrial Printing Lines: Sending ASCII print commands and lot numbers to inkjet or thermal transfer label printers.
- Legacy Instrument Gateways: Ingesting serial string data from gas analyzers, flow computers, and weather sensors into SCADA.
Field Case Study: A pharmaceutical packaging line experienced intermittent data dropouts when receiving serial lot numbers from a barcode verification scanner. Replacing a faulty serial interface card with a fully bench-tested 140ESI06210 restored proper hardware handshaking (RTS/CTS) and eliminated buffer overflow errors during high-speed production runs.
140ESI06210
140ESI06210
Quality Assurance & Testing Procedure
Every surplus 140ESI06210 module undergoes a complete dual-port serial diagnostic routine prior to dispatch:
- Visual & Structural Audit: Inspecting backplane gold contacts, side latches, and front RS-232 serial port pins for damage.
- Backplane Handshake & Power-On Test: Seated in a Quantum test chassis to verify proper 5.1V bus current draw (~250 mA) and card initialization.
- Dual-Port Loopback & Serial Data Test: Executing loopback serial transmissions on Port 1 and Port 2 at 19.2 kbps to verify string parsing, buffer management, and Tx/Rx LED operation.
- Isolation Check: Verifying 500 VDC galvanic isolation between serial ports and internal backplane circuits.
- ESD-Safe Packaging: Cleaned, static-shielded, and packaged in custom protective foam cradles.
Technical Field Tips & Traps
- ⚠️ RS-232 Cable Length Restrictions: Standard RS-232C signals are susceptible to noise over long distances. Keep serial cable runs to a maximum of 50 feet (15 meters). For longer cable distances, use an external RS-232 to RS-422/485 converter or fiber optic transceiver.
- ❗ Pinout & Handshaking Settings: Pay close attention to serial cable pinouts (Null Modem vs. Straight-Through) and software hardware handshaking settings (XON/XOFF vs. RTS/CTS). Incorrect RTS/CTS jumpering can lock up character buffers.
- ⚠️ ASCII Buffer Framing in Logic: Ensure your ladder logic / function blocks (e.g.,
READ_REGorPRINTblocks in EcoStruxure/Concept) clear character receive buffers after processing to prevent character truncation on subsequent transmissions. - ❗ Module Replacement Compatibility: When swapping a 140ESI06210, verify that the baud rate, parity, data bits, and stop bits configured in the software match the connected serial device exactly.
Frequently Asked Questions
Q: What is the difference between 140ESI06210 and 140NOM21100?
A: The 140ESI06210 is designed for point-to-point ASCII serial communication (RS-232) with devices like scales and scanners. The 140NOM21100 is a Modbus Plus network option module used for peer-to-peer PLC networking.
Q: Does the 140ESI06210 support Modbus RTU protocol?
A: While primarily designed for raw ASCII character streams and custom serial strings, configurable serial ports can be used for basic serial communication depending on the programming software function blocks used.
Q: Can I hot-swap this module under power?
A: Yes, Quantum racks support RIUP (Removal and Insertion Under Power). However, it is recommended to halt active serial transmissions in the logic before removing the card to avoid string corruption.
Q: What software is used to program the 140ESI06210?
A: It is fully supported in Concept, ProWORX 32, and Unity Pro / EcoStruxure Control Expert via standard serial I/O function blocks.
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