12. Communication Design Examples z When X0 = OFF, AC motor drive will stop. (Only PCD area is applied in this message). PLC D VLT6000, PLC sends: 02 06 01 0477 0000 76 VLT6000 D PLC, PLC receives: 02 06 01 0603 0000 00 Register for sent data (PLC sends out messages): Register for received data (VLT6000 responds with messages): z There are 2 situations for RS communication: M1123 for normal communication and M1129 for receiving timeout. When communication time-out occurred, M2 can be used to retry. Remarks: z There are 3 protocols for Danfoss VLT6000 series inverter: FC (default), Metasys N2 and LS FLN.
This program uses FC protocol which is similar with USS protocol used by Siemens MM420 series inverter: allows maximum of one master connected with 31 slaves. Slave ID: 0~31. The structure of the communication message: z The definitions of STX, LGE, ADR and BCC areas of FC protocol are the same as that of USS protocol. Please refer to Remarks in example 12.13 for description of USS protocol. DVP-PLC Application Examples 12-53 Register Data Explanation D200 low 02H Head, fixed as 02H (start of the message) D200 high 06H The number of the following bytes D201 low 01H Station No. (range: 0~31, corresponding to hex 00H~1FH) D201 high 04H Control byte (starting AC motor drive.
For the definition, please refer to Remarks.) D202 low 77H D202 high 00H Frequency (0000H corresponding to 0Hz) D203 low 00H D203 high 76H Tail. (XOR result of all the bytes before this byte) Register Data Explanation D220 low 02H Head, fixed as 02H (start of the message) D220 high 06H The number of the following bytes D221 low 01H Station No. (range: 0~31, corresponding to hex 00H~1FH) D221 high 06H Status byte (starting AC motor drive. For the definition, please refer to Remarks.) D222 low 03H D222 high 00H Frequency (0000H corresponding to 0Hz) D223 low 00H D223 high 00H Tail.
(XOR result of all the bytes before this byte) STX Head LGE Data length ADR Address PKW CH PCD Parameter Text area Process data area area BCC Checksum One byte One byte One byte Data area (N words) One byte