WRITE_CMD: Updating the command parameters

Description of the function

The WRITE_CMD function can be used to send a command to a module or integrated interface through the use of command words, by performing an explicit exchange.

NOTE: The command words are specific to each specific-application, and are described in the specific-application manuals.

The additional parameters and may also be configured.

Operation

Operation flow diagram:

FBD representation

Representation:

LD representation

Representation:

IL representation

Representation:

LD IODDT_Var

WRITE_CMD

ST representation

Representation:

WRITE_CMD(IODDT_Var);

Description of parameters

The following table describes the input parameters:

Parameter	Type	Comment
IODDT_Var	IODDT	IODDT-type variable corresponding to the channel or module on which a command is to be performed. Example: IODDT_Var of type T_COUNT_ACQ

EN stands for ENable; it is an optional block input. When the EN input is enabled, an ENO output is set automatically.

If EN = 0, the block is not enabled; its internal program is not executed, and ENO is set to 0.

If EN = 1, the block's internal program is run and ENO is set to 1. If an error occurs, ENO is set to 0.

If the EN input is not connected, it is set automatically to 1.

ENO

ENO stands for Error NOtification; this is the output associated with the optional input EN.

If ENO is set to 0 (because EN = 0 or in case of an execution error):

the status of the function block outputs remains the same as it was during the previous scanning cycle that executed correctly;
the output(s) of the function, as well as the procedures, are set to "0".