Guest jgh37 Posted February 23, 2004 Report Posted February 23, 2004 How can i calculate the address of DXXX or MXXX when I send ASC code to PLC. for example I send ENQ , STX, CMD then must send address to read. Communication book write that we can change for example D0000 to 44 30 30 30. But it don't work. I found address must calculate as this address = address*2+1000 why? Also for Q series how to calculate Quote
navillusi Posted February 24, 2004 Report Posted February 24, 2004 Can you provide some more data? What communications card are you using? AJ71UC24 or others? What protocol are you using? Dedicated protocol, no-protocol, bi-directional, computer link? Quote
Guest jgh37 Posted February 24, 2004 Report Posted February 24, 2004 I use FX2N PLC. And commnication is good when use address I wirte above. But I don't know why i must do this( address = 2* address +1000). I try to send D000 as 44 30 30 30 to PLC but get error. I want to develop the program and use Q series PLC. I want to use A series AJ71UC24 communication module because I can't get the protocol to CPU. I want to use CONTROL procedure protocol because it 's more close to FX protocol. But I don't know how to calculate address of head address in A PLC. I think communication book write is wrong.(D00000 44 30 30 30 30 30). Quote
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