Wago PLC as Master and Controllino Mega as slave

Projects Networking, Protocols, and Devices
1

Hi all,
I want to allow RTU RS485 comunication between a Controllino Mega and a Wago PLC.
I'm using a Wago PFC200 750-8212 and a Serial Card 750-653/003-000 .
Here the manual of the serial module.
https://www.wago.com/medias/m07500653-00000000-0en.pdf?context=bWFzdGVyfGRvd25sb2Fkc3w0NDEwODF8YXBwbGljYXRpb24vcGRmfGRvd25sb2Fkcy9oNGMvaDkzLzk4NjY5NzI0MzAzNjYucGRmfDRhZWZiOWI3NjI5M2U2ZGYzYmQwMTRkODlmY2FlYzQyM2M4ZmEyODcwMTU2MjA4OWZlZGQ5ZDMwNTgzOTJlODY&attachment=true
I'm using the wiring diagram at page 13 (Bus connection).

I've connected the TX+ and RX+ to Controllino RS485 + terminal and the TX- and RX- to the RS485 - terminal of the controllino.
Connected the Controllino to the 24v and serial monitor listening through USB.
I'mm using the RS485 demo code on Controllino

itialize serial port for debug messages. */
  Serial.begin(9600);
  
  /* Initialize CONTROLLINO RS485 direction control DE/RE pins and Serial3 */
  Controllino_RS485Init(9600);
  Controllino_RS485RxEnable();

  Serial.println("Recieving RS485... 1");
}

void loop() {
  
  // send data only when you receive data:
  if (Serial3.available() > 0)
  {
    // read the incoming byte from RS485
    incomingByte = Serial3.read();
    // say what you got:
    Serial.print("I received (DEC): ");
    Serial.println(incomingByte, DEC);

    // and send it back to RS485
    Controllino_RS485TxEnable();
    Serial3.write(incomingByte);
    Serial3.flush(); // wait until the trasmission is complete
    Controllino_RS485RxEnable();
  }
  
}

And the demo code on CodeSys

PROGRAM PLC_PRG
VAR
	
	test1 : BYTE;
	test2 : BYTE;
	mySerialMaster	:	FbMbMasterSerial := (
	xConnect	:= TRUE,
	udiBaudrate := 9600,
	usiDataBits := 8,
	eParity	:=	eTTYParity.None,
	eStopBits	:= eTTYHandshake.None,
	ePhysical	:= eTTYPhysicalLayer.RS485_Halfduplex,
	eFrameType	:=	eMbFrameType.RTU,
	tTimeOut	:=	T#50MS
);
utQuery	:	typMbQuery	:= (
	bUnitId	:= 	1,
	bFunctionCode	:=	16#04,
	uiReadAddress	:= 0,
	uiReadQuantity	:=	10,
	uiWriteAddress	:=	0,
	uiWriteQuantity	:=	8,
	awWriteData	:=	[1,1,1,1,1,1,1,1,1]
);

xTxTrigger	:	BOOL;
utResponse	:	typMbResponse;
tonDelay	:	TON	:=	(PT :=	T#20MS);
END_VAR



IoConfig_Globals_Mapping.an1 := 27648;

tonDelay( IN := (NOT tonDelay.Q) AND (NOT xTxTrigger));
xTxTrigger S= tonDelay.Q;



mySerialMaster(
	I_Port	:=	IoConfig_Globals.RS485_Interface_Adjust,
	utQuery	:=	utQuery,
	xTrigger	:= xTxTrigger,
	utResponse	:=	utResponse
);

Any idea?
Thanks

2

Just a suggestion, there are a lot of posts here on RS485. I did not read the manual but if you have to acknowledge a transmission from the master you would probably be better served by using the software serial module as you can do the end of transmission thing. Using the mega serial ports work great but I was not able to determine when the last character was sent to properly acknowledge the transmission required by my protocol. This response is to help you get started in solving your problem, not solve it for you.
Good Luck & Have Fun!
Gil

3

First of all, thanks for the reply.

I'm not having a protocol issue. I'm able to comunicate with two Arduino. I've this issue using Wago and Controllino.
Controllino has an integrated SN65HVD08 RS485 half bridge Transceiver.
I'm afraid of a wrong wiring or CodeSys master script.