FB_BA_StepBinary

The function block is part of a step sequence control.

It communicates via the data and command structure stStep with the higher-level control unit of the step sequence control FB_BA_StepCtrlAgg16.

The command structure stPriorityEn contains the plant enable and the priorities.

The command structure stCmd controls the connected aggregate.

Switch-on conditions of the connected aggregate

Step enabling condition within the step sequence

Switch-off conditions of the active aggregate within the step sequence

Illustration

FUNCTION_BLOCK FB_BA_StepBinary
VAR_INPUT
  stPriorityEn       : ST_BA_PriorityEn;
  bVal               : BOOL;
  bFdb               : BOOL;
  nDlyOn             : UDINT;
  nDlyOff            : UDINT;
END_VAR
VAR_OUTPUT
  stCmd              : ST_BA_Binary;
  nRemSecStepUp      : UDINT;
  nRemSecStepDown    : UDINT;
END_VAR
VAR_IN_OUT
  stStep             : ST_BA_Step;
END_VAR

Inputs

Name	Type	Description
stPriorityEn	ST_BA_PriorityEn	The command structure includes the plant enable and the priorities "Safety", "Critical" and "Program".
bVal	BOOL	Switch-on value for the connected aggregate.
bFdb	BOOL	Feedback of the connected aggregate. The feedback is required for switching to the next step. bFdb is only considered if the aggregate is the active one in the step sequence control.
nDlyOn	UDINT	Time specification of start-up delay [s]. The time specification is required for switching to the next step.
nDlyOff	UDINT	Time specification of switch-off delay [s]. The time specification is needed to switch off the active step.

Outputs

Name	Type	Description
stCmd	ST_BA_Binary	The command structure stCmd transmits the enables and switching values of the priorities to the connected aggregate.
nRemSecStepUp	UDINT	Countdown switching to the next higher level [s].
nRemSecStepDown	UDINT	Countdown switching to the next lower level [s].

/ Inputs Outputs

Name	Type	Description
stStep	ST_BA_Step	Data and command structure between the step sequence function block FB_BA_StepBinary and the control block of the step sequence FB_BA_StepCtrlAgg16.

Requirements

Development environment	Required PLC library
TwinCAT from v3.1.4024.22	Tc3_BA2 from v5.2.5.0