WRTC: Updating the system date

Description of the function

The WRTC function updates the current date in the PLC real-time clock. It is a function used to convert PL7 applications.

The additional parameters and can be configured.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

LD Date1

WRTC

Representation in ST

Representation:

WRTC(Date1);

Description of parameters

The following table describes the input parameters:

Parameter	Type	Comment
Date1	ARRAY [0...3] OF INT	Date1 must contain the current value of the date in PL7 DT format (table of 4 integers). The contents of this variable must be assigned by program before launching the function.

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".

INT

INT is the abbreviation of single INTeger (encoded in 16 bits).

The upper/lower limits are as follows: -(2 to the power of 15) to (2 to the power of 15) - 1.

Example:

-32768, 32767, 2#1111110001001001, 16#9FA4.