The internal connection status word of the status word and the actual value and the actual value are the response information transmitted from the inverter to the industrial computer. By setting P707.1=0032H, the content of the first word transfer in the PZD area is status word 1; P707.2=0091, indicating that the content of the second word and the third word of the PZD area is the actual frequency value. . The purpose of setting the reference frequency and the acceleration and deceleration time reference frequency is to display the set value and the actual value in a uniform manner. The reference frequency is calculated by the output frequency of the inverter as a percentage of the reference frequency. If the frequency value is 16 bits, the value of the second word of the PZD area is 16384 (4000H), and the output frequency of the inverter is equal to the reference frequency, which is equivalent to 100. The output frequency of %, the maximum value of the process data is 32767 and the output frequency is equivalent to 200%. When the process data value is 32768 to 65536, the reverse output frequency is 0 to 200%, and the motor is reversed. If the inverter outputs at 50% of the full frequency, the initial value of the given value is 2000H. The serial communication between the Siemens Masterdrives inverter and the industrial computer is set to set the acceleration and deceleration time. The purpose is to automatically accelerate and decelerate the generator. The unit is used to set the acceleration time data and time unit. P464, P465 unit is used to set the deceleration time data and time unit. These parameters can be set by software communication by setting the value of the PKW zone. The parameters that are unchanged during the test can also be manually set through the panel. The industrial software design of the industrial computer and the communication software between the inverters generally have three methods: one is the direct communication function, which is highly reliable but complicated to program; the second is to use Microsoft's MSComm string. Line communication control, this method is simple to program, but the reliability is poor; the third method is to use the communication class dynamic link library to implement, this kind of communication function is encapsulated, so programming is more complicated than using MSComm control, but High reliability. In the design, the third method is adopted, and the data format of the communication, the acquisition method of the checksum, and the communication timing according to the protocol should be selected in the dynamic link library of PcommPro communication.
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