IR20PTCRead

D = Device(ANINP)

R = Reading functions

The IR20PTCRead function reads the temperature value for a three point PT100 differential reading mode.

IMPLEMENTATION

IR20PTCRead (PTA_V1, PTA_V2, PTA_V3, glResistance, gbError)

Parameters:

IN/OUT	VARIABLE TYPE	EXAMPLE NAME	DIM
IN	INTDEVICE ANINP	PTA_V1	-	Mnemonic nameof ANINP device used for the entry V1
IN	INTDEVICE ANINP	PTA_V2	-	Mnemonic nameof ANINP device used for the entry V2
IN	INTDEVICE ANINP	PTA_V3	-	Mnemonic nameof ANINP device used for the entry V3
OUT	GLOBAL	glResistance	L	It is the resistance read value expressed in hundredths of Ohm.
OUT	GLOBAL	gbError	B	Variable containing the error code: 0 = no error 3 = disconnected input

Error

Once invoked the function if there are any errors the error variable having the following values:
0 - No errors
3 - Disconnected input

Example

...
 
 
 
; PT100 resistance reading
 
IR20PTCRead (PTA_V1, PTA_V2, PTA_V3, resistance, gbError)
 
...

Note

The function initializes some parameters related to 3 ANINP devices passed to the function, as follows:

	PTA_V1:offset  = 0
	PTA_V1:scaleA  = 1
	PTA_V1:scaleB  = 1
	PTA_V1:scaleC  = 0
	PTA_V2:offset  = 0
	PTA_V2:scaleA  = 1
	PTA_V2:scaleB  = 1
	PTA_V2:scaleC  = 0
	PTA_V3:offset  = 0
	PTA_V3:scaleA  = 1
	PTA_V3:scaleB  = 1
	PTA_V3:scaleC  = 0