Short summary

Name	`I2C_PCF8591_read`
→POU type	→function
Category	more system blocks, blocks for I2C elements
Graphical interface
Available since	version 1.13.0 (for logi.CAD 3) and version 2.3.901 of logi.RTS This block is supported for →Raspberry Pi only. version 1.109.0 (for logi.CAD 3) and version 3.19.0 of logi.RTS This block is supported for Raspberry Pi and the platform `LinuxX86` only.

Functionality

The block reads one of the input channels of PCF8591 (A/D and D/A converter).

For more information on the PCF8591 chip see for example: http://www.nxp.com/documents/data_sheet/PCF8591.pdf (product specification by manufacturer NXP)

	Identifier	→Data type	Description
Inputs:	`fd`	`DINT`	the handle for the I2C device file opened by the `I2C_Open` block
	`address`	`INT`	the I2C address of the PCF8591 (A/D and D/A converter)
	`channel`	UINT	the desired channel (0 – 3)
Return value:	–	UINT	returns the value of the given channel (0 – 255)

Input EN and output ENO are available when →calling the block. See "Execution control: EN, ENO" for information on input EN and output ENO.

See:

"Blocks for safe logic" whether this block is supported for developing safety-relevant applications.
"Highlighting safe logic in the FBD-editor" for the effects when using the block as a block for safe logic .

At present, there is no example.

When creating your application within the ST-editor, enter a call of a block by typing the text as requested by the syntax or use Content Assist.