Regarding the communication problem between 200 and G110 inverter, I would like to ask the senior engineers, please give detailed instructions. There is one 200plc and 14 G110 inverters, USS communication is used between them, and 14 inverters can control the multi-speed frequency in real time. Control, the control frequency is set by the screen, and the actual running frequency of 14 sets needs to be fed back to the PLC, and then displayed on the screen. The 14 motor running modes are sometimes controlled at the same time, or the control may be staggered, and each motor needs 2 speeds. · With positive and negative control, I would like to ask the senior engineers: the usage of the USS library. 1. First define the number of inverters to be controlled, baud rate, and set the corresponding communication properties in the inverter. 2.Using the usage of the USS control block, I also communicated with one PLC and one G110, and can run. The frequency can also be set, that is, a single communication can achieve the desired effect. What is confusing now is that 14 units need 14 USS control block calls? The USS control block seems to be USS_CTRL. If so, each USS control block occupies 397 bytes, then the 14 required bytes = 14 * 397 bytes? And 14 USS control blocks should write reincarnation control like the MODBUS library (does the former need to complete the bit to trigger the library needed by the latter), how to write the reincarnation control? Seniors: Please write a detailed example of the program, I would like to thank you! ! ! If the 14USS control block does not require a round trip trigger, it is called directly at the same time, so that the motor can be controlled separately at the same time? This port will not communicate, will it be wrong?
Answer: 1. The USS protocol library instruction is, in the final analysis, a sub-assembly that contains several subroutines. The operation of these subroutines will occupy the variable area. Since the subroutine runs, these variable areas are occupied, so the user cannot use it. Otherwise the operation is wrong. My students made this mistake, causing the uss command to always run with error code 1. (This kind of error, the compiler will not prompt an error. Unless you do not specify the memory area of ​​the library instruction, the program will compile error, of course, do not mention the program is running)
2, understand this point, recall the operation of the C language, obviously, no matter how many inverters you drive. All that is occupied is 397 bytes. Because they are calling the same subroutine.
3. Further, the so-called USS instruction library is essentially the free port communication of PLC, but Siemens has written a general assembly that simplifies the user's work.
4. Communication between your PLC and a single inverter has been successful. Related settings and programming should not be a problem for you. Once initialized (defining a port of the PLC to communicate using the USS protocol), the USS_CTRL (or USS_CTRL_P1) command can be used to complete the drive of multiple inverters. The key is to understand the meaning of active in initialization: this is a 32-bit integer, the 0th bit is 1, indicating that the inverter with address "0" joins uss communication, the first bit is 1, indicating that the address is "1". The inverter is connected to uss communication, and so on. One S7-200 can control 32 inverters. It should be noted that many people, first debugged one, specified the library instruction variable area, and later added multiple units, inadvertently using the variable area already assigned to the communication. Caused a running error.
5, a single operation passed, and then debug multiple units, there may be a correct inspection procedure, but it is impossible to run successfully. At this time, please check the setting of the "Bus Terminating Resistor" switch, only the first and last "ON". The second one requires a common 0V reference (terminal number 10) between the devices on the USS bus. This terminal is connected in series and connected to the COM end of the PLC. When debugging a single unit, it is not necessary to connect, and multiple bus-type communications must be connected. Third, it should be remembered that the USS protocol is a serial communication protocol, and its physical connection should be a serial connection, not a tree.
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