emaxx
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- 8 Mar 2010
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Merhaba,
Fırat Bey'in kütüphanesi olan PetitModbus kullanarak pic ile plc'yi haberleştirmeye çalıştım.
Öncesinde devreyi isis'te çizip modbus poll ve modbus tester programları ile test ettim. Modbus poll ile hem veri gönderip hem de veri okuyabildim. Bu simülasyonda tam istediğim gibi çalıştı. Fakat modbus tester'da işler biraz ters gitti. İlgili adrese data gönderebiliyorum fakat adresteki datayı okuyamıyorum. Programda "Read Status: Illegal Response" diye bir uyarı çıkıyor. Modbus poll'da bu sorunu yaşamadım.
Gelelim PLC tarafına;
Fatek plc ile pic'i max485 ile bağladım. PLC'den veri göndermek için DE ve RE pinlerini 0'a çekiyorum ve ilgili adrese data gönderebiliyorum. Görsel olarak Ledlerimi yakabiliyorum ama DE ve RE pinlerini 1'e çekip pic üzerindeki bilgiyi okumaya çalıştığımda hiçbir hareketlilik yok.
Örneğin:
Pic slave adresim 1
Kullandığım reg 0
Plc'den 400001. adrese yazma işlemiyle 1 değerini girdiğimde ilgili ledim yanıyor.
Yine pic slave adresim 1
Kullandığım reg 1
Pic'de o adresimde 1 değeri mevcut. Plc'den 400002. adrese okuma işlemini seçtiğimde bilgi gelmiyor.
Sorunum kodlarımda mı sizce yoksa plc tarafında mı?
Simülasyonda da birinde tam çalışırken diğerinde hataya düşüyor.
Yardımlarınızı bekliyorum teşekkürler.
Düzenleme:
Bu kısımda modbus ayarlarıyla ilgili kısım. Okuma ve yazma işlemlerinin olduğu program.
Fırat Bey'in kütüphanesi olan PetitModbus kullanarak pic ile plc'yi haberleştirmeye çalıştım.
Öncesinde devreyi isis'te çizip modbus poll ve modbus tester programları ile test ettim. Modbus poll ile hem veri gönderip hem de veri okuyabildim. Bu simülasyonda tam istediğim gibi çalıştı. Fakat modbus tester'da işler biraz ters gitti. İlgili adrese data gönderebiliyorum fakat adresteki datayı okuyamıyorum. Programda "Read Status: Illegal Response" diye bir uyarı çıkıyor. Modbus poll'da bu sorunu yaşamadım.
Gelelim PLC tarafına;
Fatek plc ile pic'i max485 ile bağladım. PLC'den veri göndermek için DE ve RE pinlerini 0'a çekiyorum ve ilgili adrese data gönderebiliyorum. Görsel olarak Ledlerimi yakabiliyorum ama DE ve RE pinlerini 1'e çekip pic üzerindeki bilgiyi okumaya çalıştığımda hiçbir hareketlilik yok.
Örneğin:
Pic slave adresim 1
Kullandığım reg 0
Plc'den 400001. adrese yazma işlemiyle 1 değerini girdiğimde ilgili ledim yanıyor.
Yine pic slave adresim 1
Kullandığım reg 1
Pic'de o adresimde 1 değeri mevcut. Plc'den 400002. adrese okuma işlemini seçtiğimde bilgi gelmiyor.
Kod:
ProcessPetitModbus();
// PLC'DEN GÖNDERDİĞİM BİLGİYLE BU PORTLARI AKTİF EDEBİLİYORUM
output_bit(B0,bit_test(PetitRegisters[0].ActValue,0));
output_bit(B1,bit_test(PetitRegisters[0].ActValue,1));
output_bit(B2,bit_test(PetitRegisters[0].ActValue,2));
output_bit(B3,bit_test(PetitRegisters[0].ActValue,3));
output_bit(B4,bit_test(PetitRegisters[0].ActValue,4));
output_bit(B5,bit_test(PetitRegisters[0].ActValue,5));
output_bit(B6,bit_test(PetitRegisters[0].ActValue,6));
output_bit(B7,bit_test(PetitRegisters[0].ActValue,7));
// PIC ÜZERİNDEKİ BU BİLGİYİ PLC'DEN GÖREMİYORUM
PetitRegisters[1].ActValue = 1;Sorunum kodlarımda mı sizce yoksa plc tarafında mı?
Simülasyonda da birinde tam çalışırken diğerinde hataya düşüyor.
Yardımlarınızı bekliyorum teşekkürler.
Düzenleme:
Kod:
#include "PetitModbusCcs.h"
#include "PetitModbusPortCcs.h"
/*******************************ModBus Functions*******************************/
#define PETITMODBUS_READ_COILS 1
#define PETITMODBUS_READ_DISCRETE_INPUTS 2
#define PETITMODBUS_READ_HOLDING_REGISTERS 3
#define PETITMODBUS_READ_INPUT_REGISTERS 4
#define PETITMODBUS_WRITE_SINGLE_COIL 5
#define PETITMODBUS_WRITE_SINGLE_REGISTER 6
#define PETITMODBUS_WRITE_MULTIPLE_COILS 15
#define PETITMODBUS_WRITE_MULTIPLE_REGISTERS 16
/****************************End of ModBus Functions***************************/
#define PETIT_FALSE_FUNCTION 0
#define PETIT_FALSE_SLAVE_ADDRESS 1
#define PETIT_DATA_NOT_READY 2
#define PETIT_DATA_READY 3
#define PETIT_ERROR_CODE_01 0x01 // Function code is not supported
#define PETIT_ERROR_CODE_02 0x02 // Register address is not allowed or write-protected
#define PETIT_ERROR_CODE_03 0x03 // Some data values are out of range, invalid number of register
unsigned int8 PETITMODBUS_SLAVE_ADDRESS =1;
typedef enum
{
PETIT_RXTX_IDLE,
PETIT_RXTX_START,
PETIT_RXTX_DATABUF,
PETIT_RXTX_WAIT_ANSWER,
PETIT_RXTX_TIMEOUT
}PETIT_RXTX_STATE;
typedef struct
{
unsigned int8 Address;
unsigned int8 Function;
unsigned int8 DataBuf[PETITMODBUS_RXTX_BUFFER_SIZE];
unsigned int16 DataLen;
}PETIT_RXTX_DATA;
/**********************Slave Transmit and Receive Variables********************/
PETIT_RXTX_DATA Petit_Tx_Data;
unsigned int16 Petit_Tx_Current = 0;
unsigned int16 Petit_Tx_CRC16 = 0xFFFF;
PETIT_RXTX_STATE Petit_Tx_State = PETIT_RXTX_IDLE;
unsigned int8 Petit_Tx_Buf[PETITMODBUS_TRANSMIT_BUFFER_SIZE];
unsigned int16 Petit_Tx_Buf_Size = 0;
PETIT_RXTX_DATA Petit_Rx_Data;
unsigned int16 Petit_Rx_CRC16 = 0xFFFF;
PETIT_RXTX_STATE Petit_Rx_State = PETIT_RXTX_IDLE;
unsigned int8 Petit_Rx_Data_Available = FALSE;
unsigned int16 PetitModbusTimerValue = 0;
//volatile unsigned int16 PetitModbusTimerValue = 0;
/****************End of Slave Transmit and Receive Variables*******************/
/*
* Function Name : CRC16
* @param[in] : Data - Data to Calculate CRC
* @param[in/out] : CRC - Anlik CRC degeri
* @How to use : First initial data has to be 0xFFFF.
*/
void Petit_CRC16(unsigned int8 Data, unsigned int16* CRC)
{
unsigned int8 i;
*CRC = *CRC ^(unsigned int8) Data;
for (i = 8; i > 0; i--)
{
if (*CRC & 0x0001)
*CRC = (*CRC >> 1) ^ 0xA001;
else
*CRC >>= 1;
}
}
/******************************************************************************/
/*
* Function Name : DoTx
* @param[out] : TRUE
* @How to use : It is used for send data package over physical layer
*/
unsigned int8 Petit_DoSlaveTX(void){
PetitModBus_UART_String(Petit_Tx_Buf,Petit_Tx_Buf_Size);
Petit_Tx_Buf_Size = 0;
return TRUE;
}
/******************************************************************************/
/*
* Function Name : SendMessage
* @param[out] : TRUE/FALSE
* @How to use : This function start to sending messages
*/
unsigned int8 PetitSendMessage(void)
{
if (Petit_Tx_State != PETIT_RXTX_IDLE)
return FALSE;
Petit_Tx_Current =0;
Petit_Tx_State =PETIT_RXTX_START;
return TRUE;
}
/******************************************************************************/
/*
* Function Name : HandleModbusError
* @How to use : This function generated errors to Modbus Master
*/
void HandlePetitModbusError(unsigned int8 ErrorCode)
{
// Initialise the output buffer. The first byte in the buffer says how many registers we have read
Petit_Tx_Data.Function = ErrorCode | 0x80;
Petit_Tx_Data.Address = PETITMODBUS_SLAVE_ADDRESS;
Petit_Tx_Data.DataLen = 0;
PetitSendMessage();
}
/******************************************************************************/
/*
* Function Name : HandleModbusReadHoldingRegisters
* @How to use : Modbus function 03 - Read holding registers
*/
#if PETITMODBUS_READ_HOLDING_REGISTERS_ENABLED > 0
void HandlePetitModbusReadHoldingRegisters(void)
{
// Holding registers are effectively numerical outputs that can be written to by the host.
// They can be control registers or analogue outputs.
// We potientially have one - the pwm output value
unsigned int16 Petit_StartAddress = 0;
unsigned int16 Petit_NumberOfRegisters = 0;
unsigned int16 Petit_i = 0;
// The message contains the requested start address and number of registers
Petit_StartAddress = ((unsigned int16) (Petit_Rx_Data.DataBuf[0]) << 8) + (unsigned int16) (Petit_Rx_Data.DataBuf[1]);
Petit_NumberOfRegisters = ((unsigned int16) (Petit_Rx_Data.DataBuf[2]) << 8) + (unsigned int16) (Petit_Rx_Data.DataBuf[3]);
// If it is bigger than RegisterNumber return error to Modbus Master
if((Petit_StartAddress+Petit_NumberOfRegisters)>NUMBER_OF_OUTPUT_PETITREGISTERS)
HandlePetitModbusError(PETIT_ERROR_CODE_02);
else
{
// Initialise the output buffer. The first byte in the buffer says how many registers we have read
Petit_Tx_Data.Function = PETITMODBUS_READ_HOLDING_REGISTERS;
Petit_Tx_Data.Address = PETITMODBUS_SLAVE_ADDRESS;
Petit_Tx_Data.DataLen = 1;
Petit_Tx_Data.DataBuf[0] = 0;
for (Petit_i = 0; Petit_i < Petit_NumberOfRegisters; Petit_i++)
{
unsigned int16 Petit_CurrentData = PetitRegisters[Petit_StartAddress+Petit_i].ActValue;
Petit_Tx_Data.DataBuf[Petit_Tx_Data.DataLen] = (unsigned int8) ((Petit_CurrentData & 0xFF00) >> 8);
Petit_Tx_Data.DataBuf[Petit_Tx_Data.DataLen + 1] = (unsigned int8) (Petit_CurrentData & 0xFF);
Petit_Tx_Data.DataLen += 2;
Petit_Tx_Data.DataBuf[0] = Petit_Tx_Data.DataLen - 1;
}
PetitSendMessage();
}
}
#endif
/******************************************************************************/
/*
* Function Name : HandleModbusReadInputRegisters
* @How to use : Modbus function 06 - Write single register
*/
#if PETITMODBUSWRITE_SINGLE_REGISTER_ENABLED > 0
void HandlePetitModbusWriteSingleRegister(void)
{
// Write single numerical output
unsigned int16 Petit_Address = 0;
unsigned int16 Petit_Value = 0;
unsigned int8 Petit_i = 0;
// The message contains the requested start address and number of registers
Petit_Address = ((unsigned int16) (Petit_Rx_Data.DataBuf[0]) << 8) + (unsigned int16) (Petit_Rx_Data.DataBuf[1]);
Petit_Value = ((unsigned int16) (Petit_Rx_Data.DataBuf[2]) << 8) + (unsigned int16) (Petit_Rx_Data.DataBuf[3]);
// Initialise the output buffer. The first byte in the buffer says how many registers we have read
Petit_Tx_Data.Function = PETITMODBUS_WRITE_SINGLE_REGISTER;
Petit_Tx_Data.Address = PETITMODBUS_SLAVE_ADDRESS;
Petit_Tx_Data.DataLen = 4;
if(Petit_Address>=NUMBER_OF_OUTPUT_PETITREGISTERS)
HandlePetitModbusError(PETIT_ERROR_CODE_03);
else
{
PetitRegisters[Petit_Address].ActValue=Petit_Value;
// Output data buffer is exact copy of input buffer
for (Petit_i = 0; Petit_i < 4; ++Petit_i)
Petit_Tx_Data.DataBuf[Petit_i] = Petit_Rx_Data.DataBuf[Petit_i];
}
PetitSendMessage();
}
#endif
/******************************************************************************/
/*
* Function Name : HandleModbusWriteMultipleRegisters
* @How to use : Modbus function 16 - Write multiple registers
*/
#if PETITMODBUS_WRITE_MULTIPLE_REGISTERS_ENABLED > 0
void HandleMPetitodbusWriteMultipleRegisters(void)
{
// Write single numerical output
unsigned int16 Petit_StartAddress =0;
unsigned int8 Petit_ByteCount =0;
unsigned int16 Petit_NumberOfRegisters =0;
unsigned int8 Petit_i =0;
unsigned int16 Petit_Value =0;
// The message contains the requested start address and number of registers
Petit_StartAddress = ((unsigned int16) (Petit_Rx_Data.DataBuf[0]) << 8) + (unsigned int16) (Petit_Rx_Data.DataBuf[1]);
Petit_NumberOfRegisters = ((unsigned int16) (Petit_Rx_Data.DataBuf[2]) << 8) + (unsigned int16) (Petit_Rx_Data.DataBuf[3]);
Petit_ByteCount = Petit_Rx_Data.DataBuf[4];
// If it is bigger than RegisterNumber return error to Modbus Master
if((Petit_StartAddress+Petit_NumberOfRegisters)>NUMBER_OF_OUTPUT_PETITREGISTERS)
HandlePetitModbusError(PETIT_ERROR_CODE_03);
else
{
// Initialise the output buffer. The first byte in the buffer says how many outputs we have set
Petit_Tx_Data.Function = PETITMODBUS_WRITE_MULTIPLE_REGISTERS;
Petit_Tx_Data.Address = PETITMODBUS_SLAVE_ADDRESS;
Petit_Tx_Data.DataLen = 4;
Petit_Tx_Data.DataBuf[0] = Petit_Rx_Data.DataBuf[0];
Petit_Tx_Data.DataBuf[1] = Petit_Rx_Data.DataBuf[1];
Petit_Tx_Data.DataBuf[2] = Petit_Rx_Data.DataBuf[2];
Petit_Tx_Data.DataBuf[3] = Petit_Rx_Data.DataBuf[3];
// Output data buffer is exact copy of input buffer
for (Petit_i = 0; Petit_i <Petit_NumberOfRegisters; Petit_i++)
{
Petit_Value=(Petit_Rx_Data.DataBuf[5+2*Petit_i]<<8)+(Petit_Rx_Data.DataBuf[6+2*Petit_i]);
PetitRegisters[Petit_StartAddress+Petit_i].ActValue=Petit_Value;
}
PetitSendMessage();
}
}
#endif
/******************************************************************************/
/*
* Function Name : RxDataAvailable
* @return : If Data is Ready, Return TRUE
* If Data is not Ready, Return FALSE
*/
unsigned int8 Petit_RxDataAvailable(void)
{
unsigned int8 Result = Petit_Rx_Data_Available;
Petit_Rx_Data_Available = FALSE;
return Result;
}
/******************************************************************************/
/*
* Function Name : CheckRxTimeout
* @return : If Time is out return TRUE
* If Time is not out return FALSE
*/
unsigned int8 Petit_CheckRxTimeout(void)
{
// A return value of true indicates there is a timeout
if (PetitModbusTimerValue>= PETITMODBUS_TIMEOUTTIMER)
{
PetitModbusTimerValue =0;
PetitReceiveCounter =0;
return TRUE;
}
return FALSE;
}
/******************************************************************************/
/*
* Function Name : CheckBufferComplete
* @return : If data is ready, return DATA_READY
* If slave address is wrong, return FALSE_SLAVE_ADDRESS
* If data is not ready, return DATA_NOT_READY
* If functions is wrong, return FALSE_FUNCTION
*/
unsigned int8 CheckPetitModbusBufferComplete(void)
{
int16 PetitExpectedReceiveCount=0;
if(PetitReceiveCounter>4)
{
if(PetitReceiveBuffer[0]==PETITMODBUS_SLAVE_ADDRESS)
{
if(PetitReceiveBuffer[1]==0x01 || PetitReceiveBuffer[1]==0x02 || PetitReceiveBuffer[1]==0x03 || PetitReceiveBuffer[1]==0x04 || PetitReceiveBuffer[1]==0x05 || PetitReceiveBuffer[1]==0x06) // RHR
{
PetitExpectedReceiveCount =8;
}
else if(PetitReceiveBuffer[1]==0x0F || PetitReceiveBuffer[1]==0x10)
{
PetitExpectedReceiveCount=PetitReceiveBuffer[6]+9;
}
else
{
PetitReceiveCounter=0;
return PETIT_FALSE_FUNCTION;
}
}
else
{
PetitReceiveCounter=0;
return PETIT_FALSE_SLAVE_ADDRESS;
}
}
else
return PETIT_DATA_NOT_READY;
if(PetitReceiveCounter==PetitExpectedReceiveCount)
{
return PETIT_DATA_READY;
}
return PETIT_DATA_NOT_READY;
}
/******************************************************************************/
/*
* Function Name : RxRTU
* @How to use : Check for data ready, if it is good return answer
*/
void Petit_RxRTU(void)
{
unsigned int8 Petit_i;
unsigned int8 Petit_ReceiveBufferControl=0;
Petit_ReceiveBufferControl =CheckPetitModbusBufferComplete();
if(Petit_ReceiveBufferControl==PETIT_DATA_READY)
{
Petit_Rx_Data.Address =PetitReceiveBuffer[0];
Petit_Rx_CRC16 = 0xffff;
Petit_CRC16(Petit_Rx_Data.Address, &Petit_Rx_CRC16);
Petit_Rx_Data.Function =PetitReceiveBuffer[1];
Petit_CRC16(Petit_Rx_Data.Function, &Petit_Rx_CRC16);
Petit_Rx_Data.DataLen=0;
for(Petit_i=2;Petit_i<PetitReceiveCounter;Petit_i++)
Petit_Rx_Data.DataBuf[Petit_Rx_Data.DataLen++]=PetitReceiveBuffer[Petit_i];
Petit_Rx_State =PETIT_RXTX_DATABUF;
PetitReceiveCounter=0;
}
Petit_CheckRxTimeout();
if ((Petit_Rx_State == PETIT_RXTX_DATABUF) && (Petit_Rx_Data.DataLen >= 2))
{
// Finish off our CRC check
Petit_Rx_Data.DataLen -= 2;
for (Petit_i = 0; Petit_i < Petit_Rx_Data.DataLen; ++Petit_i)
{
Petit_CRC16(Petit_Rx_Data.DataBuf[Petit_i], &Petit_Rx_CRC16);
}
if (((unsigned int16) Petit_Rx_Data.DataBuf[Petit_Rx_Data.DataLen] + ((unsigned int16) Petit_Rx_Data.DataBuf[Petit_Rx_Data.DataLen + 1] << 8)) == Petit_Rx_CRC16)
{
// Valid message!
Petit_Rx_Data_Available = TRUE;
}
Petit_Rx_State = PETIT_RXTX_IDLE;
}
}
/******************************************************************************/
/*
* Function Name : TxRTU
* @How to use : If it is ready send answers!
*/
void Petit_TxRTU(void)
{
Petit_Tx_CRC16 =0xFFFF;
Petit_Tx_Buf_Size =0;
Petit_Tx_Buf[Petit_Tx_Buf_Size++] =Petit_Tx_Data.Address;
Petit_CRC16(Petit_Tx_Data.Address, &Petit_Tx_CRC16);
Petit_Tx_Buf[Petit_Tx_Buf_Size++] =Petit_Tx_Data.Function;
Petit_CRC16(Petit_Tx_Data.Function, &Petit_Tx_CRC16);
for(Petit_Tx_Current=0; Petit_Tx_Current < Petit_Tx_Data.DataLen; Petit_Tx_Current++)
{
Petit_Tx_Buf[Petit_Tx_Buf_Size++]=Petit_Tx_Data.DataBuf[Petit_Tx_Current];
Petit_CRC16(Petit_Tx_Data.DataBuf[Petit_Tx_Current], &Petit_Tx_CRC16);
}
Petit_Tx_Buf[Petit_Tx_Buf_Size++] = Petit_Tx_CRC16 & 0x00FF;
Petit_Tx_Buf[Petit_Tx_Buf_Size++] =(Petit_Tx_CRC16 & 0xFF00) >> 8;
Petit_DoSlaveTX();
Petit_Tx_State =PETIT_RXTX_IDLE;
}
/******************************************************************************/
/*
* Function Name : ProcessModbus
* @How to use : ModBus main core! Call this function into main!
*/
void ProcessPetitModbus(void)
{
if (Petit_Tx_State != PETIT_RXTX_IDLE) // If answer is ready, send it!
Petit_TxRTU();
Petit_RxRTU(); // Call this function every cycle
if (Petit_RxDataAvailable()) // If data is ready enter this!
{
if (Petit_Rx_Data.Address == PETITMODBUS_SLAVE_ADDRESS) // Is Data for us?
{
switch (Petit_Rx_Data.Function) // Data is for us but which function?
{
#if PETITMODBUS_READ_HOLDING_REGISTERS_ENABLED > 0
case PETITMODBUS_READ_HOLDING_REGISTERS: { HandlePetitModbusReadHoldingRegisters(); break; }
#endif
#if PETITMODBUSWRITE_SINGLE_REGISTER_ENABLED > 0
case PETITMODBUS_WRITE_SINGLE_REGISTER: { HandlePetitModbusWriteSingleRegister(); break; }
#endif
#if PETITMODBUS_WRITE_MULTIPLE_REGISTERS_ENABLED > 0
case PETITMODBUS_WRITE_MULTIPLE_REGISTERS: { HandleMPetitodbusWriteMultipleRegisters(); break; }
#endif
default: { HandlePetitModbusError(PETIT_ERROR_CODE_01); break; }
}
}
}
}
/******************************************************************************/
/*
* Function Name : InitPetitModbus
* @How to use : Petite ModBus slave initialize
*/
void InitPetitModbus(unsigned int8 PetitModbusSlaveAddress)
{
PETITMODBUS_SLAVE_ADDRESS =PetitModbusSlaveAddress;
PetitModBus_UART_Initialise();
PetitModBus_TIMER_Initialise();
}
/******************************************************************************/Bu kısımda modbus ayarlarıyla ilgili kısım. Okuma ve yazma işlemlerinin olduğu program.
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