PRODUCT SPECIFICATION

PRODUCT SPECIFICATION
VP Series PLC Communication Protocol
V1.1a

一、  簡介.......................................................................................................................... 3
二、  軟體規範................................................................................................................... 3
三、  機能.......................................................................................................................... 3
四、  連線方式................................................................................................................... 6
五、  通訊格式介紹：........................................................................................................ 7
1.  通訊資料協定........................................................................................................ 7
2.  通訊資料格式........................................................................................................ 7
i. ASCII Mode................................................................................................... 7
ii. RTU Mode..................................................................................................... 8
3.  通訊工作方式........................................................................................................ 8
4.  錯誤訊息回應........................................................................................................ 9
六、  MODBUS通訊命令格式：..................................................................................... 10
‹ Function 01：Read Coil Status........................................................................... 10
‹ Function 02：Read Input Status......................................................................... 12
‹ Function 03：Read Holding Registers ............................................................... 13
‹ Function 05：Force Single Coil .......................................................................... 15
‹ Function 06：Preset Single Register.................................................................. 16
‹ Function 0F：Force Multiple Coils...................................................................... 17
‹ Function 10：Preset Multiple Register ............................................................... 18
七、  備註........................................................................................................................ 19
‹ 備註 1：CRC 規格.............................................................................................. 19
‹ 備註 2：Exception Code..................................................................................... 19
‹ 備註 3：DVP-PLC通訊元件位址........................................................................ 20