The Manual Loader (MANLD) function block allows the block output to be set by an operator. The block supports output tracking and alarm detection.
You can force the output value to the tracking value by using the tracking inputs. This is useful for bumpless transfer. The BKCAL_IN input parameter sets the block output automatically for bumpless transfer when the downstream path is not complete.
You can connect other function blocks that require the manually entered value to the Manual Loader block output (OUT). In addition, you can connect an input measurement or calculation value that might be useful to an operator in making manual entries by connecting the associated block parameter to the Manual Loader block input (IN).
BKCAL_IN is the value from another block's BKCAL_OUT used for backward output tracking for bumpless transfer.
IN is the analog input value and status.
TRK_IN_D is the discrete input that initiates the external tracking function.
TRK_VAL is the value applied to OUT in Local Override (LO) mode.
OUT is the analog output value and status.
The following figure shows the internal components of the Manual Loader function block:
