CP-9131 is the first version of ODOT Automation PLC, the programming environment follows the IEC61131-3 international standard programmable system, and it supports 5 programming languages such as Instruction List (IL), Ladder Diagram (LD), Structured Text (ST), Function Block Diagram (CFC/FBD) and Sequential Function Chart (SFC).

The PLC could support 32 pcs of IO modules, and its program storage supports 127Kbyte, data storage supports 52Kbyte, the data storage area contains input area of 1K(1024Byte), output area of 1K(1024Byte), and intermediate variable area of 50K.

With built-in standard serial communication RS485 interface, it carries with 2 RJ45 interfaces which is a small PLC with rich functions.

CP-9131 is the core component of the whole C series, its main work is not only responsible for executing the user’s logic program, but also responsible for all I/O data receiving and sending, communication data processing and other works. With rich instructions, reliable function, good adaptability, compact structure, easy to expand, cost-effective, strong versatility, programming, monitoring, debugging, field operation are very convenient, the PLC could be applied to a variety of automation systems.

The Ethernet interface on the CPU supports the Modbus TCP Server function, supports the third-party Modbus TCP Client to accesss data, supports Modbus TCP Client function, supports to access to data of third-party Modbus TCP Server.

The RS485 port supports the Modbus RTU master, Modbus RTU slave, and supports third-party devices to communicate with PLC through a serial port.

Parameter Name	Parameter Value
Type	compact DIN rail
Network	Modbus RTU Modbus TCP
Other characteristics	high-speed real-time IEC 61131 DIN rail
Applications	for railways