Skip to main content

FB_init

Short summary​

The constructor FB_init is needed to create an unique hash code. The hash code is a pseudo random number create with a xorshift_ algorithm. It can be overwritten on derivations, because it will be called implicit, SUPER^.FB_init() is not required. For more information check: Behavoir with derived function blocks_

.. _Behavoir with derived function blocks: https://infosys.beckhoff.com/content/1033/tc3_plc_intro/5482088715.html?id=6983869892358031022 .. _xorshift: https://en.wikipedia.org/wiki/Xorshift

  • Return type: BOOL

Parameters​

NameTypeCommentKind
bInitRetainsBOOLif TRUE, the retain variables are initialized (warm start / cold start)input
bInCopyCodeBOOLif TRUE, the instance afterwards gets moved into the copy code (online change)input
globalMessageServiceCNM_MessageInterfaces.IMessageServicethe message service that should be linked to the static global message serviceinput

Code​

Declaration​

METHOD FB_init : BOOL
VAR_INPUT
	(* if TRUE, the retain variables are initialized (warm start / cold start)*)
	bInitRetains	: BOOL;
	(* if TRUE, the instance afterwards gets moved into the copy code (online change) *)
	bInCopyCode	: BOOL;
	(* the message service that should be linked to the static global message service *)
	globalMessageService :CNM_MessageInterfaces.IMessageService;
END_VAR

Implementation​

THIS^.ourGlobalMessageService := globalMessageService;