What are the basic ways of communication between Delta inverter and CP1H? How do you write an Omron

There are two communication methods to control with CP1H.

Modbus master function of CP1H;

Protocol-free functionality of PLC;

If it is some older models of Omron inverters (only Omron inverters), you can also consider using the third method, function block (FBL).

Variable-frequency drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply. The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. The inverter relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation.

With the continuous improvement of industrial automation, frequency converters have also been widely used.

A few kinds of problems, don't laugh Siemens' general communication port is a 485 hardware network. S7-PC and PLC generally use 232 port serial communication, such as Omron, Koyo, Delta, 422 485 also a lot, such as.

The universal modbus communication protocol of the inverter.

Omron CPM2A has two communication ports, one RS-232 and one peripheral port. Delta's inverter is an RS485 communication port and requires a 485 232 conversion cable connection.

Delta's VFD-E uses Modbus ASCII or Modbus RTU protocol, and Modbus ASCII uses LRC verification. Modbus RTU: CRC checksum;

The PLC should use a free protocol for communication procedures. The specific inverter parameters, addresses, etc., should carefully read the inverter technical manual.

I have only done the communication between Mitsubishi PLC and Mitsubishi inverter Yaskawa inverter, all of which are serial communication, and the calibration method used by Mitsubishi is ASII Yaskawa is CRC-16, Delta's has not been used, I don't know, what communication method, what check code method, you take a closer look at the manual of the inverter, there must be written on the manual, and there seem to be many program examples on the industrial controller's home.

Generally, there are two control methods, the inverter comes with terminal control, which needs to set the parameters of the inverter according to the equipment and PLC.

In addition, it is to rely on the RS485 communication of the PLC, which needs to set the communication protocol of the PLC and the RS485 communication protocol of the inverter.

I've only done Omron's 485 serial port data collection, and I want to use the content of the protocol macro.

If it is a communication between CP1H and CP1H, there is a communication method, which is very simple, you only need to send the data you want to communicate to the specified address, and read the data from the specified address when reading the data. Please refer to the manual for specific programming.

1. Write your own CRC verification, no protocol for serial port.

2. Simple modbus master station function. Master the three flags: one send, one complete, and one error.

Is there an agreement?

The 485 can connect multiple devices together.

Therefore, there must be a communication protocol.

It should be a free mouth protocol, and you have to look at the manual of the inverter to figure out the communication baud rate and so on.

One is to look at the PLC communication, the other is to find the inverter manual, see what the communication instruction format means, parameter adjustment, PLC is written according to this.