Communication with CanOpen-gateway

kevin07

I´ve a CPU315-2DP and would like to transfer and receive data from a CanBus-node. I´ve a adapter to convert the signals.
To get data from the CanBus-node I´ve to send a request. The request value is sendby 16 bytes (output-bytes)to the Canbus. The answer is coming in to a another 16 input bytes.
Are there any SFC/SFB that can transfer 16 bytes to the peripheral output area?
Is it ok to use L and T ( Load and Transfer) to move data to peripheral output area?

kevin07

Hi,
I´ve a CPU315-2DP and would like to transfer and receive data from a CanBus-node. I´ve a adapter to convert the signals.
To get data from the CanBus-node I´ve to send a request. The request value is sendby 16 bytes (output-bytes)to the Canbus. The answer is coming in to a another 16 input bytes.
Are there any SFC/SFB that can transfer 16 bytes to the peripheral output area?
Is it ok to use L and T ( Load and Transfer) to move data to peripheral output area?

Best regards
Kevin

Hi Kevin,

I did some communications with Chicago Pneumatics using ComboBox-P. Well, I can say that isnot very simple, but is not impossible.

Well, Globalization, inclusive we, programmers are affected. The Chigaco's support was terrible, because the ComboBox-Pis not a product of them.

For while, I can pass to you the manual of ComboBox-P. Read the manual and send me your doubts. More than this, I would have to send that FBs that I did to you, but the commercial department of my company would kill me.

I created an FB that control the synchronism of msgs between send/recv using these structures:

//Register's struct of each message of compressor
TYPE CREGISTRO
STRUCT
ADDRESS: BYTE:=B#16#0; //Compressor's address
REG_LO: BYTE:=B#16#0; //Register's Byte LO
REG_HI: BYTE:=B#16#0; //Register's ByteHI
VALUE_B1: BYTE:=B#16#0; //Message - Byte 1
VALUE_B2: BYTE:=B#16#0; //Message - Byte2
VALUE_B3: BYTE:=B#16#0; //Message - Byte3
VALUE_B4: BYTE:=B#16#0; //Message - Byte4
NULL_REG: BYTE:=B#16#FF;//End ofstruct
END_STRUCT
END_TYPE

//Frame's struct of each message of combobox-p
TYPE CFRAME
STRUCT
HEADER: BYTE:=B#16#0; //Frame header
NULL_FRAME: BYTE:=B#16#FF; //Null Byte
REGISTROS: ARRAY[1..2] OF CREGISTRO;//2Registers by Frame
END_STRUCT
END_TYPE

So, you can send 16 bytes (in my case)using the SFC14 and SFC15 to ComboBox-P.

The most important thing that you need observe, is the control bits in header of msg that you are sending and mainly that is receiving.

Good Luck.

kevin07

Hello Marcio,
You´ve got it. It´s Atlas Copco´s Combox-P.
If you haveexperiences on that thing, would you please send me some example on the plc-program?
I´ve 7 compressors I would like to represent informations on my panel.
I´v talked to Atlas support in Stockholm but it seems they don´t realy know how it works on the plc-side.

Best regards
Kevin