SYSSTATE: System state

Function description

This function block displays the status of the PLC.

SYSSTATE is task-specific and can be used in MAST, FAST and AUX tasks.

SYSSTATE cannot be used in EVT tasks.

and can be configured as additional parameters.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

CAL SYSSTATE_Instance (COLD=>ColdStartCycle, 
    WARM=>WarmStartCycle, ERROR=>ErrorInBuffer)

Representation in ST

Representation:

SYSSTATE_Instance (COLD=>ColdStartCycle, 
    WARM=>WarmStartCycle, ERROR=>ErrorInBuffer) ;

Parameter description

Description of output parameters:

Parameter	Data type	Description
COLD	BOOL	Is set for one cycle to "1", when the user task is in a cold start cycle, i.e. the first start after the project has been completely loaded. COLD operates inversely to the user task bit in %SW10 (TSKINIT).
WARM	BOOL	Is set for one cycle to "1" when the PLC or the user task is started, i.e. after switching on the power or by starting the SPS after a stop. When a STOP->RUN transition of the corresponding tasks occurs, WARM is set to "1". After the logic of the corresponding tasks have been completed, WARM is set to "0". WARM is identical to the user task specific system bit %S21.
ERROR	BOOL	Is set to "1" when there are error messages in the diagnostic buffer that have not yet been acknowledged. ERROR is set to "1" if %SW78 (DNBERRBUF) is not "0".

NOTE: In cold start cycle both outputs COLD and WARM are set to "1".

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".