WRITE_INPUT_UDINT: Writing Inputs of Type UDINT

Function Description

WRITE_INPUT_UDINT is used to simulate (write) a value at a %ID input. The input is written directly when WRITE_INPUT_UDINT is invoked.

The function block can be used with a real PLC and the PLC simulator.

Restrictions:

The function block provides access to one variable at a time (elementary data types and not arrays of elementary data types).
Only variable addresses are allowed, you cannot use declared variables even if they are mapped on a %ID direct address.
The simulation block WRITE_INPUT_UDINT does not work if the I/O module is configured in a RIO drop but works properly if the I/O module is configured in a local rack or DIO device.

NOTE: Using the WRITE_INPUT_UDINT EFB with RIO networks, the behavior in simulation mode could be different from PLC behavior. The input is set by the WRITE_INPUT_UDINT EFB but overwritten by the value sent by the RIO scanner in the OUT phase of the PLC scan.

The additional parameters and can be configured.

FBD representation

Representation:

LD representation

Representation:

IL representation

Representation:

WRITE_INPUT_UDINT (INP:=Value (*UDINT*))
ST Simulated_Input (*UDINT*)

ST representation

Representation:

(*UDINT*) Simulated_Input:=WRITE_INPUT_UDINT (INP:=Value, (*UDINT*));

Parameter Description

The following table describes the input parameters:

Parameter	Type	Comment
INP	UDINT	value to be assigned to the variable

The following table describes the output parameters:

Parameter	Type	Comment
OUTP	UDINT	variable to be modified

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".