Industrial Serial Communication Solution – SIEMENS 6ES7340-1CH02-0AE0 | SIMATIC S7-300 CP 340
The SIEMENS 6ES7340-1CH02-0AE0 (CP 340) is a point-to-point communication processor designed for the SIMATIC S7-300 PLC platform. It enables reliable RS422/RS485 serial data exchange between S7-300 controllers and third-party devices — scanners, drives, weighing systems, robots, and legacy field instruments — without burdening the CPU. For procurement engineers sourcing proven serial communication modules, this is the definitive S7-300 CP 340 variant for RS422/RS485 applications.
Where This Product Is Used
The CP 340 RS422/RS485 is specified across demanding industrial environments where serial point-to-point communication is required:
- Automotive Assembly Lines — Connecting S7-300 PLCs to barcode readers, vision systems, and torque tools via RS485 multi-drop networks
- Packaging & Filling Machines — Serial data exchange with weighing controllers, label printers, and batch management systems
- Water & Wastewater Treatment — Long-distance RS422 communication to remote sensors and flow meters in distributed SCADA architectures
- Textile & Printing Industry — Synchronizing S7-300 with servo drives and tension controllers over RS485
- Food & Beverage Processing — Hygienic-area instrument integration where Profibus is unavailable and serial protocols dominate
- Building Automation & HVAC — Interfacing legacy BMS controllers and energy meters using Modbus RTU over RS485
- Chemical & Pharmaceutical Plants — Connecting analyzers and chromatographs with proprietary serial protocols to S7-300 control systems
- Port & Crane Control — Robust RS422 full-duplex links for high-noise environments with long cable runs
Technical Specifications
| Order Number (MLFB) | 6ES7340-1CH02-0AE0 |
| Product Family | SIMATIC S7-300 CP 340 |
| Module Type | Communication Processor (CP) |
| Serial Interface | RS422 / RS485 |
| Communication Mode | Point-to-Point (PtP) |
| Supported Protocols | ASCII, 3964(R), RK 512 |
| Max. Baud Rate | 76.8 kbps |
| RS485 Multi-Drop | Up to 32 nodes |
| RS422 Full-Duplex | Yes (4-wire) |
| Isolation | Electrically isolated interface |
| Power Supply | Via S7-300 backplane bus (5 VDC) |
| Current Consumption (5V) | 160 mA |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 10% to 95% (non-condensing) |
| Degree of Protection | IP20 |
| Dimensions (W×H×D) | 40 × 125 × 120 mm |
| Weight | approx. 300 g |
| Mounting | S7-300 DIN rail, any slot |
| Configuration Software | STEP 7 V5.x / TIA Portal (via legacy support) |
| Country of Origin | Germany |
| CE / UL Certified | Yes |
Why Engineers Specify This Model
- CPU Offload Architecture — The CP 340 handles all serial communication autonomously, freeing S7-300 CPU cycles for process control logic
- RS422 Full-Duplex Reach — Supports cable runs up to 1,200 m at reduced baud rates, ideal for distributed plant layouts
- RS485 Multi-Drop Flexibility — Connect up to 32 devices on a single bus segment without additional repeaters in most applications
- Protocol Versatility — ASCII mode enables integration with virtually any third-party device; 3964(R) and RK 512 cover legacy Siemens-to-Siemens links
- Electrically Isolated Interface — Protects the S7-300 backplane from ground loops and transient surges common in industrial environments
- Proven 20+ Year Field Record — Widely deployed in global manufacturing; spare parts and replacements remain critical for plant maintenance
- Slot-Independent Installation — Mounts in any S7-300 slot, simplifying rack layout and expansion planning
Complete System Bill of Materials
For a complete S7-300 serial communication node, engineers typically specify:
- 6ES7340-1CH02-0AE0 — CP 340 RS422/RS485 Communication Processor (this item)
- 6ES7315-2AG10-0AB0 — CPU 315-2 DP (or equivalent S7-300 CPU)
- 6ES7307-1EA01-0AA0 — PS 307 5A Power Supply Module
- 6ES7390-1AE80-0AA0 — S7-300 DIN Rail 480 mm
- 6ES7392-1AM00-0AA0 — Front Connector for signal modules
- 6XV1830-0EH10 — PROFIBUS/RS485 Bus Cable (per meter)
- 6ES7340-1CH02-0AE0 Configuration Cable — PC-to-MPI adapter for STEP 7 programming
Compliance & Industry Standards
- CE Marking — EU Low Voltage Directive & EMC Directive compliant
- UL Listed — UL 508 Industrial Control Equipment
- IEC 61131-2 — Programmable Controllers: Equipment Requirements & Tests
- ATEX / IECEx — Not rated for Zone 0/1; use appropriate barriers for hazardous areas
- RoHS Compliant — Restriction of Hazardous Substances Directive
- ISO 9001 — Manufactured under Siemens certified quality management system
Quality Assurance & Sourcing
Konmask.com sources the 6ES7340-1CH02-0AE0 exclusively through verified industrial distribution channels. Every unit undergoes:
- Visual inspection against Siemens OEM packaging and label standards
- Firmware version and date-code verification
- Functional power-on test prior to dispatch
- Anti-static packaging with humidity indicator cards
- Full traceability documentation available on request
We do not source from grey-market or unverified secondary channels. Counterfeit risk is actively mitigated through our supplier qualification process.
How to Source This Part
- Add to Cart — Click the purchase button above to place your order directly
- Request a Quote — For volume orders (5+ units) or project BOM pricing, email [email protected]
- Lead Time — In-stock units ship within 1–3 business days; ex-stock availability confirmed at inquiry
- Export Documentation — Commercial invoice, packing list, and certificate of origin provided for international shipments
- Payment — T/T bank transfer, PayPal, and major credit cards accepted
Application-Specific FAQ
Q: Can the 6ES7340-1CH02-0AE0 run Modbus RTU?
A: Not natively. The CP 340 supports ASCII, 3964(R), and RK 512 protocols. Modbus RTU requires a custom ASCII driver implemented in STEP 7 FB/FC blocks, which is a common engineering practice for this module.
Q: What is the maximum cable length for RS485?
A: At 9.6 kbps, cable runs up to 1,200 m are achievable. At 76.8 kbps (maximum), limit cable length to approximately 100 m. Always use shielded twisted-pair cable with proper termination resistors.
Q: Is this module compatible with TIA Portal?
A: The CP 340 was designed for STEP 7 Classic (V5.x). TIA Portal supports S7-300 via a legacy compatibility layer, but CP 340 configuration is performed in STEP 7 Classic. Siemens recommends migrating to CP 341 or ET 200SP COM for new TIA Portal projects.
Q: Can I use this in an S7-400 rack?
A: No. The 6ES7340-1CH02-0AE0 is exclusively designed for the S7-300 backplane. For S7-400, specify the CP 441 family (e.g., 6ES7441-1AA04-0AE0).
Q: What is the difference between 6ES7340-1AH02-0AE0 and 6ES7340-1CH02-0AE0?
A: The -1AH02 variant provides an RS232C interface; the -1CH02 provides RS422/RS485. Select based on your field device interface standard.
Q: Do you supply the configuration software (FB/FC blocks)?
A: Siemens provides the CP 340 driver blocks (FB 3/FC 3 for send, FB 4/FC 4 for receive) as a free download from the Siemens Industry Online Support portal. Konmask can provide guidance on block integration upon request.
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