Page Comparison

// Array in size of process-image
uint8_t		abRecvData[27] = {0};
uint8_t 	abSendData[22] = {0};
	...
	...
	...
// Set flags of header-states
abSendData[0] = 0x80;
abSendData[1] = 0x80;
abSendData[2] = 0x80;
abSendData[3] = 0x80;

// Do I/O data exchange until a key is hit
while(!kbhit())
{	
	if(CIFX_NO_ERROR != xChannelIORead(hChannel, 0, 0, sizeof(abRecvData), abRecvData, IO_WAIT_TIMEOUT)){
		// ERROR reading IO Data area!
		...
	}
	
	// Consumer-states for incomming data-slots - set to GOOD-Flag when all data could be received completely
	abRecvData[4] = 0x80;
	abRecvData[8] = 0x80;
	
	// check if provider flags from node are GOOD-Flag...
	if(abRecvData[8] != 0x80 || abRecvData[26] != 0x80){
		// Provider status are BAD ... data from node are not persistent
		...
	}
	
	// Handle I/O data-arrays
	... = abRecvData[/* {x: 4 .. 7 } */];
	... = abRecvData[/* {x: 10 .. 25 } */];
	abSendData[/* {x: 5, 6 } */] = ...
	abSendData[/* {x: 9 .. 20 } */] = ...

	// Provider-states for all outging data-slots - set to GOOD-Flag
	abSendData[7] = 0x80;
	abSendData[21] = 0x80;
	
	if(CIFX_NO_ERROR != xChannelIOWrite(hChannel, 0, 0, sizeof(abSendData), abSendData, IO_WAIT_TIMEOUT)){
		// ERROR writing IO data area!
		...
	}
	...
}