WRITE_INPUT_EBOOL: Writing Inputs of Type EBOOL

Function Description

WRITE_INPUT_EBOOL is used to simulate (write) a value at a variable, IODDT variable, or state RAM. The input is written directly when WRITE_INPUT_EBOOL 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).
The simulation block WRITE_INPUT_EBOOL 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_EBOOL EFB with RIO networks, the behavior in simulation mode could be different from PLC behavior. The input is set by the WRITE_INPUT_EBOOL 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_EBOOL (INP:=Value (*BOOL*)) 
ST Simulated_Input (*EBOOL*)

ST representation

Representation:

(*EBOOL*) Simulated_Input:=WRITE_INPUT_EBOOL (INP:=Value (*BOOL*));

Parameter Description

The following table describes the input parameters:

Parameter	Type	Comment
INP	BOOL	Value to be assigned to the variable

The following table describes the output parameters:

Parameter	Type	Comment
OUTP	EBOOL	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".

EBOOL

EBOOL is the abbreviation of Extended BOOLean. An EBOOL type has a value (0 (FALSE) or 1 (TRUE), but also rising or falling edges and forcing functions.

An EBOOL variable occupies one byte in memory.

The byte contains the following information:

one bit for the value;
one bit for the history (whenever the object changes state, the value is copied to the history bit);
one bit for forcing (equal to 0 if the object is not forced, or 1 if the bit is forced).

The default value of each bit is 0 (FALSE).