Looking for a compact, standards-compliant PLC for machine and plant automation that relies on open protocols and a vendor-neutral development environment? The Odot C3351-B01 is a practical solution. The CPU has no built-in I/O channels – which makes it deliberately flexible: the expansion modules you connect (digital, analog, temperature, special functions) determine which I/O types are used. ⚠️ Version information: B01 replaces A00 The C3351-B01 is the current successor to the C3351-A00. The key difference is significantly expanded memory: the B01 offers 4 MB program memory, 4 MB data memory, and 32 KB retentive data – compared to 1 MB each and only 1.5 KB retentive memory in the A00. 💡 Important when switching: The device profile of the A00 and B01 differ. In CODESYS and IO-Config, you must load the correct B01 device description file – the A00 file is not compatible. For version identification (side label on the device or IO-Config firmware info) and migration details, please refer to the manual. 🏭 Typical applications Compact systems with integrated network communication: The C3351-B01 acts simultaneously as a Modbus TCP Client and Server – ideal for systems that connect sensors or external SCADA systems without separate gateway hardware. Retrofit with serial fieldbus structure: The RS-485 interface supports Modbus RTU as both Master and Slave. Existing serial subsystems – drives, inverters, displays – can be connected directly without additional hardware. Modular control cabinet design: Up to 32 expansion modules (digital I/O, analog I/O, temperature measurement, encoder inputs, special functions) allow a precisely tailored configuration without unused channels. IEC 61131-3 projects with portability: If you already have CODESYS experience or want to reuse software modules across different PLC vendors, the C3351-B01 with its five IEC programming languages is ready to go. 💻 Programming with CODESYS 3.5 The C3351-B01 is programmed with CODESYS V3.5.19.70. All five IEC 61131-3 programming languages are supported: Ladder Diagram (LD), Instruction List (IL), Structured Text (ST), Function Block Diagram (FBD/CFC), and Sequential Function Chart (SFC). The CODESYS development environment is available as a free download from the ODOT website. For configuration, online debugging, module selection, and firmware updates of the I/O modules, ODOT's IO-Config software is available. It communicates directly via the CPU's Ethernet interface and is also available as a free download. 💡 Note: When using CODESYS versions other than V3.5.19.70, some functions may differ from the manual description. See the included manual for details. 🔌 Communication and interfaces 2 × Ethernet RJ45, 10/100 Mbit/s: Port 1 and Port 2 support switch cascading – useful when integrating the PLC into an existing network topology without an additional switch. Modbus TCP Client/Server: The CPU connects as a client to up to 6 Modbus TCP servers simultaneously and accepts connections from up to 6 Modbus TCP clients at the same time. Distributed SCADA connections and mixed network topologies can be mapped flexibly. RS-485 – Modbus RTU Master and Slave: Baud rates from 2,400 to 115,200 bps, Modbus RTU and Modbus ASCII. As Master, up to 5 slave devices are supported; as Slave, 1 master device is supported. 🔧 Installation and wiring Mounts on a 35 mm DIN rail, vertical orientation on a vertical surface. Push-in terminals (tool-free wiring). Wire cross-section: 0.2 to 1.5 mm² (AWG 24 – AWG 16). Supply voltage: 24 V DC (permissible range: 19.2 – 28.8 V DC, with reverse polarity protection). 🏷️ Manufacturer and reliability Odot Automation (Sichuan ODOT Automation System Co., Ltd.) is a manufacturer specializing in IEC 61131-3 PLCs and distributed I/O systems for industrial automation. The C3351 series is designed for industrial environments up to Pollution Degree 2 and certified for control cabinet installation (IP20).

Anyone looking for a Codesys-based controller for coordinated multi-axis applications — without the budget of a Siemens or Beckhoff solution — will find a powerful and cost-effective alternative in the Kinco AK840M. The PLC supports motion control for up to 32 EtherCAT axes with cycle times from 1 to 4 ms, and can be flexibly expanded with modules from the Kinco RP20 series. 🏭 Typical Applications Multi-axis positioning: Gantries, linear axes or robot cells with up to 32 synchronised EtherCAT servo axes — programmed directly in Codesys, without additional motion hardware. Machine control with the Codesys standard: Users already familiar with Codesys 3.5 (e.g. from Beckhoff or ODOT projects) can deploy the AK840M without a new learning curve. The free Codesys IDE runs on any standard PC. Retrofit of existing systems: The compact DIN rail form factor and broad Modbus support (RTU + TCP, client and server) make replacing older controllers straightforward — even when RS-485 field devices are still in use. Modular systems with variable I/O: If you need to extend the onboard I/O (8 inputs, 8 outputs) with analogue, digital or temperature modules, simply attach RP20 expansion modules — up to 16 per CPU. 🖥️ Key Technical Specs Memory: 32 MB program memory, 32 MB data memory and 1 MB non-volatile storage for recipes and process values. Onboard digital I/O: 8 digital inputs (24 V DC, PNP/NPN) and 8 transistor outputs (PNP, max. 300 mA), plus 2 high-speed counter inputs up to 200 kHz for incremental encoders. Analogue I/O: Not available onboard — add RP20 analogue modules if required (0–10 V / 4–20 mA, 4 or 8 channels). Supply voltage: 24 V DC, permissible range 19 – 29 V DC. 🔌 Connectivity and Interfaces EtherCAT: Natively integrated — synchronises up to 32 axes with a 1 – 4 ms cycle time. Ideal for Kinco FD5 servo drives and RP20 expansion modules via EtherCAT bus coupler. Ethernet: 2 × RJ45 (10/100 Mbit/s) for programming, monitoring and Modbus TCP. RS-485: 1 serial port for Modbus RTU client or server (formerly master/slave) — direct connection of frequency inverters, sensors or other field devices. USB: For programming and data transfer. CANopen: Optional via plug-in board (Communication Extension Board BD20.CAN). 🌐 Communication Protocols Modbus TCP and RTU: To connect frequency inverters, energy meters or other Modbus devices, use the built-in client mode (formerly master) via TCP or RS-485. The PLC can simultaneously act as a server (formerly slave) — e.g. for a higher-level SCADA system. EtherCAT: For axis control and connection of RP20 modules via the EtherCAT bus coupler. 🔗 Expandability: Kinco RP20 System The AK840M supports up to 16 modules from the Kinco RP20 series. Connect them directly to the PLC (without bus coupler) or use an EtherCAT bus coupler for remote I/O: Digital I/O modules: 8 or 16 channels, transistor or relay — RP20 Digital Modules. Analogue I/O modules: 0 – 10 V / 4 – 20 mA, 2+2 or 4 channels — RP20 Analogue Modules. Temperature modules: PT100 or thermocouple (type J, K, S etc.) — RP20 Temperature Modules. 💡 Codesys 3.5 — Free Development Environment The AK840M is programmed in Codesys 3.5 — the widely used IEC 61131-3 standard supporting ST, FBD, LD, SFC and IL. The IDE is available free of charge; the device description file for the AK840M is available as a download directly on this page. 🔗 Download Codesys 3.5 free of charge 🏷️ Manufacturer and Reliability Kinco Automation is an established manufacturer with years of experience developing PLCs, HMIs and drive technology for the global industrial market. The AK840M is CE certified and designed for continuous industrial use (operating temperature −20 °C to +55 °C, IP20, passive cooling). Kinco products are in use at well over 100 spstiger customers across Germany. 🔧 Mounting and Scope of Delivery Mounting: 35 mm DIN rail, dimensions 57 × 108 × 95 mm, passive cooling (no fan, no wear). Scope of delivery: AK840M controller, plug-in terminal connectors. Software and documentation: Device description file for Codesys 3.5 and datasheet available as downloads directly on this page.