User Manual of EM760 High-Performance Inverter (1) Function of Modbus communication free mapping This function maps any function codes to internal function codes ofthe inverter, so as to ensure normal use of Modbus communication without having to alter the original PLC program. F45.00: enable communication mapping. You’ll have to set F45.00 = 1 to use the communication mapping feature, otherwise it won’t work. To disable mapping, just set F45.00=0. You can map up to 30 sets of function codes, each of which requires 3 function codes: 1. Source address: source address to be mapped 2. Target address: internal function code address to be mapped to with the source address 3. Mapping coefficient:
when the decimal places are different between the source address and the target address data, you can adjust it via the mapping coefficient. If the decimal places are the same, no change is required for this. (2) Conversion rules of mapping address All mapping addresses are set as decimal. Conversion rules: To map F15.38 to F18.22, first convert the index 15 of the source address F15.38 into hexadecimal 0FH, and sub-index 38 into hexadecimal 26H. Synthesize them into 0F26H, and convert it into corresponding decimal 3878. Convert the index 18 of the target address F18.22 into hexadecimal 12H, and sub-index 22 into hexadecimal 16H.
Synthesize them into 1216H, and convert it into corresponding decimal 4630. Set the function codes as follows: F45.00=1 (mapping effective) F45.01=3878 (source address F15.38) F45.02=4630 (target address F18.22) (3) Mapping coefficient When the decimal separator is different between the source address and the target address, you can adjust it via the mapping coefficient. All parameters are readable. Therefore, mapping coefficient is set as per parameter reading by default, and will be converted automatically for parameter writing. No extra effort is required on setting a writing coefficient.
In reading inverter parameters, data will be sent to the PLC after being multiplied by mapping coefficient. In writing parameters, the inverter will divide the data by mapping coefficient after receiving it. In case ofreading output frequency of the inverter, with the source address F10.00=50.0Hz and the target address F00.07=50.00Hz, you need to set the mapping coefficient as 0.10. Data returned by the inverter to the PLC: target address data * mapping coefficient = 5000 * 1 = 500, which is consistent with the source address F10.00 in respect of decimal separator. When writing inverter output frequency, the PLC sends the data 500, and the inverter receives:
500 / 0.1 = 5000, which is consistent with the target address F00.07 in respect of decimal separator. Principles on setting mapping coefficient: always set the mapping coefficient for parameter reading, whether you are actually reading or writing the parameter. (4) Mapping example: a. Mapping external address to internal address of the same function 168