三菱FX5U通訊(MODBUS) @ 史克威爾凱特的部落格

安裝GX Works3 (僅設定RS485，與它通訊的電腦可以不用安裝)

更新GX Works3 (否則會沒有FX5U可以選)

將FX5U 與電腦接到Hub上

(我電腦網段在192.168.0.XXX，PLC 在192.168.3.XXX，不影響連線)

開啟GX Works3

新增專案

連線

在連線雙擊滑鼠左鍵

連線測試

設定MODBUS

到參數→FX5UCPU→模組參數→RS485串列埠，雙擊滑鼠左鍵

選擇MODBUS_RTU 通訊

設定站號

寫到PLC

重開PLC，GX Work3可以拋到一旁去了，

我透過自己寫的PC小程式去測試通訊

送碼測試指令整理

01H，讀取M0:
Send:010120000001F60A
Receive:01010100F188 (M0為OFF)

01H，讀取M0~M7:
Send:010120000008360C
Receive:010101005188 (M0~M7為OFF)

01H，讀取M0~M15:
Send:0101200000103606
Receive:010102FF00F80C (M0~M7為ON M8~M15為OFF)

03H，讀取D0:
Send:010300000001840A
Receive:0103020000B844 (D0為0)

03H，讀取D0~D1:
Send:010300000002C40B
Receive:01030400640000BBEC (D0~D1為0)

05H，寫入M0 ON:
Send:01052000FF0087FA
Receive:01052000FF0087FA

05H，寫入M0 OFF:
Send:010520000000C60A
Receive:010520000000C60A

06H，寫入D0:
Send:0106000000648821
Receive:0106000000648821

0FH，寫入M0~M7 ON
Send:010F2000000801FFB9B5
Receive:010F200000085FCD

10H，寫入D0=100, D1=200
Send:01100000000204006400C8B3E6
Receive:01100000000241C8

功能代碼:

01H 讀取多個暫存器(Bit型)
03H 讀取多個暫存器(Word型)
05H 寫入單一暫存器(Bit型)
06H 寫入單一暫存器(Word型)
0FH 寫入多個暫存器(Bit型)
10H 寫入多個暫存器(Word型)

MODBUS地址(Bit型暫存器)

0000H～03FFH Y0～1023
2000H～3DFFH M0～7679
5000H～57FFH SM0～2047
5800H～75FFH L0～7679
7800H～78FFH B0～255
9800H～987FH F0～127
A000H～A0FFH SB0～255
B000H～BFFFH S0～4095
D000H～D1FFH TC0～511
D800H～D9FFH TS0～511
E000H～E00FH SC0～15
E800H～E80FH SS0～15
F000H～F0FFH CC0～255
F800H～F8FFH CS0～255

MODBUS地址(Word型暫存器)

0000H～1F3FH D0～7999
5000H～770FH SD0～9999
7800H～79FFH W0～512
A000H～A0FFH SW0～512
D000H～D1FFH TN0～511
E000H～E00FH SN0～15
F000H～F0FFH CN0～255