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Schneider Modicon M340 BMXP341000 is a Level 1 CPU processor module, designed for small and medium-sized industrial automation projects. It is equipped with 2048 kB memory, supports Modbus/Ethernet communication, and features expandability for 512 digital I/O points + 128 analog I/O points. Featuring compact structure, industrial-grade environmental adaptability and flexible communication performance, it is an ideal choice for manufacturing, energy, water treatment and other industries. Following maintenance guidelines and troubleshooting manuals ensures long-term stable operation and cuts down system maintenance costs.
- Model Code Explanation
| Model Segment | Meaning | Description |
| BMX | Product Series Prefix | Identification of Schneider Modicon M340 series PLC products |
| P34 | Product Type | P stands for processor module; 34 represents M340 series |
| 1000 | Model Number | 1000 refers to basic CPU, supports Modbus communication, max. 512 digital I/O + 128 analog I/O |
| No suffix | Standard Version | Without special suffix means standard temperature range (0~60°C) and IP20 protection degree |
| -S | Optional Suffix | Mark for special version in partial documents, generally refers to standard configuration |
- Core Specification Table
| Category | Specifications | Description |
| Basic Configuration | Level 1 CPU processor of Modicon M340 series | Core control module for small & medium industrial automation systems |
| 1 × Modbus serial port (RS-485) | ||
| 1 × Ethernet port (Modbus/TCP) | ||
| Backplane bus connection, compatible with 11-slot rack | ||
| Memory Capacity | Total RAM: 2048 kB | Meets the demands of medium-scale control programs |
| Program memory: 1792 kB | ||
| Data memory: 128 kB | ||
| I/O Capacity | Max. 512 digital I/O points (single rack) | Flexible expansion to fit projects of different scales |
| Max. 66 analog I/O points (single rack) / 128 analog I/O points (multi-rack) | ||
| Distributed I/O: 63 Ethernet Modbus/TCP devices + 32 Modbus link devices | ||
| Communication Performance | Built-in Modbus RTU (serial) & Modbus TCP (Ethernet) | Compatible with mainstream industrial protocols, supports remote monitoring |
| Supports up to 2 local racks (main + extension) | ||
| Max. serial baud rate: 115.2 kbps | ||
| Ethernet: 10/100Base-TX, RJ45 interface | ||
| Power Supply Parameters | Operating voltage: 240 VAC | Integrated with power system of M340 series racks |
| Typical power consumption: 10 W, max. 15 W | ||
| Power interface: Backplane power supply, no extra wiring needed | ||
| Physical Parameters | Dimensions: 102 × 130 × 39 mm | Compact size, suitable for standard industrial control cabinets |
| Weight: 0.2 kg | ||
| Mounting: Special clip-type mounting for M340 racks | ||
| Environmental Parameters | Operating temperature: 0~60°C | Excellent industrial environmental adaptability for harsh working conditions |
| Storage temperature: -40~70°C | ||
| Relative humidity: 5~95% (non-condensing) | ||
| Protection degree: IP20 | ||
| Vibration resistance: 5~150 Hz, 0.5 mm peak-to-peak | ||
| Shock resistance: 15 g, 11 ms | ||
| Certifications | CE, UL/cUL, RoHS, IEC 61131-2 | Compliant with international industrial standards, available for global market |
| Ordering Code | BMXP341000 | Standard model without special suffix |
III. Full Series Model List (M340 Series CPU Modules)
| Model | Grade | Memory Capacity | Communication Interfaces | Max. I/O Capacity | Main Features |
| BMXP341000 | Level 1 | 2048 kB (1792/128) | 1 × Modbus serial + 1 × Ethernet | 512 Digital + 128 Analog | Basic type with Modbus communication |
| BMXP342000 | Level 2 | 4096 kB (3584/512) | 1 × Modbus serial + 1 × Ethernet | 1024 Digital + 256 Analog | Enhanced type with larger memory |
| BMXP343020 | Level 3 | 8192 kB (6912/1280) | 2 × Ethernet (routing supported) + 1 × Modbus serial | 2048 Digital + 512 Analog | Advanced type, dual Ethernet with routing function |
| BMXP343030 | Level 3 | 8192 kB (6912/1280) | 2 × Ethernet + 1 × Modbus serial + 1 × CANopen | 2048 Digital + 512 Analog | All-round type with CANopen bus support |
| BMXP344020 | Level 4 | 16384 kB (14336/2048) | 2 × Ethernet (routing supported) + 1 × Modbus serial | 4096 Digital + 1024 Analog | Flagship type with large memory and redundancy support |
- Replacement Comparison: Old & New Models / Peer Products
- Old and New Model Replacement
| Old Model | New Model | Major Upgrades |
| TSXP341000 | BMXP341000 | Upgraded to M340 series, backplane compatible, 30% performance improvement |
| Memory expanded to 2048 kB to support more I/O points | ||
| Built-in Ethernet port for stronger communication capability |
- Peer Product Comparison (Same-grade PLC CPU Modules)
| Model | Brand | Memory Capacity | Communication Interfaces | Max. I/O Capacity | Price Range |
| BMXP341000 | Schneider | 2048 kB | 1 × Modbus + 1 × Ethernet | 512 Digital + 128 Analog | $730~$850 |
| 1769-L32E | Rockwell | 1 MB | 1 × Ethernet + 2 × Serial | 1024 I/O Points | $800~$950 |
| CPU 1214C | Siemens | 50 kB Program + 100 kB Data | 1 × Ethernet + 1 × Serial | 288 I/O Points | $600~$750 |
| CJ2M-CPU13 | Omron | 2048 kB | 1 × Ethernet + 2 × Serial | 1024 I/O Points | $700~$820 |
- Application Environments & Industry Cases
- Applicable Scenarios
Manufacturing Industry: Production line automatic control, packaging machinery, material handling system
Energy & Utilities: Power distribution control, renewable energy system, water treatment plant
Infrastructure: Building automation, traffic signal control, environmental monitoring system
Food & Beverage: Processing production line, filling equipment, quality inspection system
Chemical Industry: Batch control, mixing system, safety interlock device
Pharmaceutical Industry: GMP-compliant production process control
- Non-recommended Scenarios
High electromagnetic interference environment: No special shielding design, extra protective measures required
Explosion-proof area: Standard version without explosion-proof certification, select dedicated explosion-proof models
Unprotected outdoor environment: IP20 protection level, only for indoor control cabinet installation
Redundant system required: BMXP341000 does not support CPU redundancy, choose high-grade models like BMXP344020
- Typical Application Cases
Case 1: Automotive Parts Production Line Control
Application: Control multi-process automatic production lines including stamping, welding and assembly
Configuration: BMXP341000 + Digital I/O module + Analog I/O module + HMI touch screen
Value: Realize coordinated control of each process, raise production efficiency by 25% and reduce manual operation
Case 2: Intelligent Water Treatment Plant Monitoring System
Application: Control water pumps, valves, dosing equipment and monitor water quality parameters
Configuration: Connect to SCADA system via Modbus/TCP and connect on-site instruments via Modbus RTU
Value: Realize remote monitoring and automatic control, cut energy consumption by 30% and stabilize water quality
- Common Faults & Troubleshooting Solutions
| Fault Phenomenon | Possible Causes | Solutions |
| CPU module fails to start | 1. Power failure | 1. Check 240VAC power supply and measure backplane voltage |
| 2. Poor backplane connection | 2. Reinsert the module and fasten the clip tightly | |
| 3. Program error | 3. Clear programs and redownload for test | |
| 4. Hardware damage | 4. Replace the module for verification | |
| Communication interruption | 1. Incorrect network settings | 1. Verify IP address and subnet mask settings |
| 2. Damaged communication cables | 2. Test network cables and check serial wiring | |
| 3. Mismatched protocol parameters | 3. Unify baud rate, parity bit and other parameters | |
| 4. Damaged ports | 4. Use spare ports for testing | |
| No response from I/O modules | 1. Backplane bus failure | 1. Inspect backplane connection and replace rack for test |
| 2. Defective I/O modules | 2. Replace faulty I/O modules | |
| 3. Wrong address configuration | 3. Confirm correct module address settings | |
| 4. Insufficient power supply | 4. Check power load and add extra power modules | |
| Abnormal program operation | 1. Program logic error | 1. Monitor programs online to find logic errors |
| 2. Memory overflow | 2. Optimize programs to reduce memory usage | |
| 3. External signal interference | 3. Strengthen shielding and grounding for anti-interference | |
| 4. Outdated firmware version | 4. Upgrade to the latest stable firmware | |
| Abnormal flashing indicators | 1. System failure | 1. Check diagnostic information to locate faults |
| 2. Communication error | 2. Inspect communication lines and configurations | |
| 3. Power fluctuation | 3. Install voltage stabilizer to stabilize power quality | |
| 4. Module overheating | 4. Improve ventilation and lower ambient temperature |
VII. Replaceability Analysis of Core Components
| Component | Replaceability | Operation Difficulty | Required Tools | Notes |
| CPU Mainboard | Low | High | N/A (integral replacement) | High replacement cost for core parts, whole module replacement recommended |
| Communication Interface | Low | High | Soldering iron, solder wire | Highly integrated with mainboard, operated by professional maintenance staff only |
| Memory Chip | Low | High | Hot air gun, solder wire | Professional BGA welding equipment required with high operation risk |
| Power Module | High (External) | Low | Screwdriver | Replace with matched 240VAC power module after power off |
| Backplane Connector | Medium | Medium | Screwdriver, clip tool | Disassemble gently to avoid damaging backplane slots |
| Indicator Light | Medium | Medium | Soldering iron, solder wire | SMD components, operate delicately with anti-static measures |
VIII. Daily Maintenance & Prevention Guidelines
- Installation & Wiring Rules
Ensure full insertion and firm clamping of modules to avoid poor contact
Separate communication cables from power cables with spacing ≥30cm to reduce electromagnetic interference
Complete reliable system grounding with grounding resistance below 4Ω
- Regular Maintenance Schedule
| Maintenance Item | Cycle | Operation Content |
| Firmware Upgrade | Semi-annually | Check official Schneider website and update to latest stable firmware |
| Dust Removal | Quarterly | Clean dust on module surface and vents with compressed air after power cut |
| Connection Inspection | Monthly | Check module installation and wiring tightness |
| Operation Status Monitoring | Weekly | Check CPU load, memory usage and communication status via programming software |
| Program Backup | After every modification | Back up programs and configurations to prevent data loss |
- Fault Prevention Measures
Keep cabinet internal temperature within 0~60°C and humidity at 5~95% non-condensing range
Equip surge protector and UPS to avoid damage from voltage fluctuation and sudden power cut
Set access passwords to restrict unauthorized access and check communication logs regularly
Adopt dual-computer hot standby or redundant communication configuration for key projects
- Air Freight Compliance & Certifications
- Air Freight Compliance
No built-in lithium battery, compliant with IATA dangerous goods regulations, deliverable as general cargo by air
Use original packaging or anti-static packaging to prevent vibration and impact damage during transit
Mark FRAGILE label on package to avoid heavy extrusion
- Certification Documents
| Certification | Standard | Application Scope |
| CE | EN 61131-2, EN 55032 | European market access |
| UL/cUL | UL 61010-1 | North American safety approval |
| RoHS | 2011/65/EU | Environmental protection compliance |
| IEC | IEC 61131-2 | International industrial standard compliance |
- Selection Guidelines & Quick Rules
Quick Selection Rules
- Grade Classification: 1000=Level 1, 2000=Level 2, 3000=Level 3, 4000=Level 4
- Memory Standard: Level1=2MB, Level2=4MB, Level3=8MB, Level4=16MB
- Communication Configuration: Basic version: 1×Modbus +1×Ethernet; High-grade version supports CANopen or dual Ethernet
- I/O Expansion: Max. 512 digital +128 analog points for Level1; I/O capacity doubles with each higher grade
