The Control Selector (CTLSL) function block selects one of three control signals to perform override control to a PID function block. The block supports mode control. The outputs are calculated based on the actual operation mode, which is determined by parameter values and input value statuses.
There are no standard alarms in this function block. Custom alarms are supported.
BKCAL_IN is the analog input value and status from a downstream block's BKCAL_OUT output that is used for backward output tracking for bumpless transfer.
SEL_1 is the first input value to the selector.
SEL_2 is the second input value to the selector.
SEL_3 is the third input value to the selector.
BKCAL_SEL1 is the selector output value associated with SEL_1 for backward output tracking to an upstream PID function block.
BKCAL_SEL2 is the selector output value associated with SEL_2 for backward output tracking to an upstream PID function block.
BKCAL_SEL3 is the selector output value associated with SEL_3 for backward output tracking to an upstream PID function block.
OUT is the output value and status.
The following diagram shows the internal components of the Control Selector function block:
