Here, the PLC sends individually-wired Forward, Reverse, and Stop, and speed-control command signals to a variable-frequency drive (VFD) which then sends three-phase power of varying frequency to an AC induction motor to do some useful task:

In this article, we will learn the Modbus communication of delta PLC (DVP 14SS2) with delta VFD (VFD-L series) to control the motor speed.

modbus 通讯只会出现 4 种情况：正常通讯完成对应通讯标志 m1127；通讯错误对应标志：m1129、m1140、m1141。所以，在程序中通过对这 4 个通讯标志信号的 on/off 状态进行计数，再利用 c0 的数值来控制 3 个 modbus 指令的依次执行，保证通讯的可靠性。

In many previous posts, plc247.com has guided you to use different HMI/PLC to control Delta VFD-M inverter using Modbus-RTU RS485 communication standard. Today I would like to continue to guide you to use a PC to control the inverter directly. To be able to do this we need the software “Modbus Poll” and “USB to RS485 Cable”

2017年11月20日 · Modbus RTU uses the RS-485 serial port to transmit communication between machines. Information is sent between a single Master device and the Slave devices as simple,16-bit messages. When using Modbus RTU data is stored on the Slave devices in four tables – two for coils (on/off values) and two for registers (numerical values).

1 天前 · s7-200和两台变频器modbus rtu通信程序 采用西门子224xp，配mcgs触摸屏，变频器一台三菱D700,一台台达vfd-m,通过modbus rtu程序可以控制变频器的正反转，停止，频率的设定，加减速，以及频率电流的读取。第三步，配置mcgs触摸屏。

台达VFD-M变频器 需要设置以下参数: 第二步. 连接方式: PLC采用RS-485的Modbus-RTU通讯方法控制变频器: RS485接线: 9针头的3+和变频器的4+相连, 9针头的8-和变频器的3-相连, 第三步:plc编写程序. 第一步. 台达VFD-M变频器需要设置以下参数: 代码 出厂 设置 说明 P76 --- 09 恢复出厂设置 P00 00 03 频率指定来源设定 P01 00 03 运转命令指定设定 P88 01 01 通讯地址 P89 01 01 通讯传输速度 (9600bps) P92 04 0…

Modbus communication of delta HMI (DOP 107CV) with delta VFD (VFD-L series). The motor is to be run directly from HMI (DOP-107CV) on Modbus communication.

VFD and Modbus. So far, there are two options for using a Modbus VFD interface. One option is to create a HAL component as a driver. This would present the VFD's I/O as halpins. modbus.c and modbus.h are used to support the driver. Another option is …

2024年6月3日 · 本文将以一个台达PLC与台达VFD变频器之间的modbus通讯案例为切入点，详细介绍两者之间的通讯原理和步骤，以及其在实际应用中的配置和使用方式。 PLC程序编写 通过PLC的编程软件，编写PLC的程序代码，包括PLC与VFD之间的数据读写和命令发送等部分。