12. Communication Design Examples PLC D VLT6000, PLC sends: 02 0E 01 1200 0000 00000000 047F 2000 44 VLT6000 D PLC, PLC receives: 02 0E 01 1200 0000 000000FA 0F07 1FFF 0D Register for sent data (PLC sends out messages): Register for received data (VLT6000 responds with messages): DVP-PLC Application Examples 12-52 Register Data Explanation D100 low 02H Head, fixed as 02H (start of the message) D100 high 0EH The number of the following bytes D101 low 01H Station No. (range: 0~31, corresponding to hex 00H~1FH) D101 high 12H PKW area PKE 1H: function code for reading parameters 200H: parameter No.
P512 (output frequency) D102 low 00H D102 high 00H IND Index area (used in indexed parameters, such as P615. Not used in this program.) D103 low 00H D103 high 00H PWE high Value: 1 (In read status: 0. In write status: high word will be read) D104 low 00H D104 high 00H PWE low Value: 2 (In read status: 0. In write status: low word will be read) D105 low 00H D105 high 04H PCD1 area Control word (starting VLT6000. For the definition, please refer to Remarks.) D106 low 7FH D106 high 20H PCD2 area Frequency (4000H corresponds to base frequency 50Hz and 2000H corresponds to 25Hz) D107 low 00H D107 high 44H BCC area Tail.
(XOR result of all the bytes before this byte) Register Data Explanation D120 low 02H Head, fixed as 02H (start of the message) D120 high 0EH The number of the following bytes D121 low 01H Station No. (range: 0~31, corresponding to hex 00H~1FH) D121 high 12H PKW area PKE 1H: function code for reading parameters 200H: parameter No. P512 (output frequency) D122 low 00H D122 high 00H IND Index area (used in indexed parameters, such as P615. This program doesn’t use.) D123 low 00H D123 high 00H PWE high High word will be read D124 low 00H D124 high 00H PWE low Low word will be read (00FAH corresponds to the decimal value 250 which means the frequency of 25Hz.
D125 low FAH D125 high 0FH PCD1 area Status word (For the definition, please refer to Remarks.) D126 low 07H D126 high 1FH PCD2 area Frequency (4000H corresponds to the base frequency 50Hz and 1FFFHZ corresponds to 25Hz) D127 low FFH D127 high 0DH BCC area Tail. (XOR result of all the bytes before this byte)