DROP: Configuring an I/O station rack
(Original Document)
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Function description
The function block is used to edit the configuration data of a remote or distributed I/O station for subsequent processing by module configuration EFBs.
To configure an I/O station rack, the DROP function block in the configuration section is connected to the corresponding SLOT output of the QUANTUM function block. The number of the I/O station defined in the I/O map has to be entered at the NUMBER input of the DROP function block. The function blocks for configuration of the analog modules of the I/O stations are connected to the SLOT outputs.
NOTE: Do not specify Literals at the SLOT inputs of the configuration EFBs. SLOT inputs must be connected to SLOT outputs. Values in SLOT outputs are not supposed to be used directly by the user. They refer to configuration areas in the PLC memory associated to the configured modules. Invalid values will cause a runtime error message in menu Tools → Diagnostic Viewer.
NOTE: In a M580 application with Quantum drops, SLOT input is let unconnected because the QUANTUM function block is not used.
EN and ENO can be configured as additional parameters.
Representation in FBD
Representation:
Representation in LD
Representation:
Representation in IL
Representation: 
CAL DROP_Instance (SLOT:=SlotForRIO_DIO_NOM,
    NUMBER:=NumberOfRIO_DIO_NOM, SLOT1=>Slot1,
    SLOT2=>Slot2, SLOT3=>Slot3, SLOT4=>Slot4, SLOT5=>Slot5,
    SLOT6=>Slot6, SLOT7=>Slot7, SLOT8=>Slot8, SLOT9=>Slot9,
    SLOT10=>Slot10, SLOT11=>Slot11, SLOT12=>Slot12,
    SLOT13=>Slot13, SLOT14=>Slot14, SLOT15=>Slot15,
    SLOT16=>Slot16)
Representation in ST
Representation: 
DROP_Instance (SLOT:=SlotForRIO_DIO_NOM,
    NUMBER:=NumberOfRIO_DIO_NOM, SLOT1=>Slot1,
    SLOT2=>Slot2, SLOT3=>Slot3, SLOT4=>Slot4, SLOT5=>Slot5,
    SLOT6=>Slot6, SLOT7=>Slot7, SLOT8=>Slot8, SLOT9=>Slot9,
    SLOT10=>Slot10, SLOT11=>Slot11, SLOT12=>Slot12,
    SLOT13=>Slot13, SLOT14=>Slot14, SLOT15=>Slot15,
    SLOT16=>Slot16) ;
Parameter description
Description of input parameters:
Parameter
Data type
Meaning
SLOT
INT
Slot for RIO, DIO, NOM
NUMBER
DINT
Number of RIO, DIO, NOM
Description of output parameters:
Parameter
Data type
Meaning
SLOT1
INT
Slot 1
:
:
:
SLOT16
INT
Slot 16
Runtime error
If no "Head" has been configured for the I/O station rack, an error message is returned.
NOTE: For a list of all block error codes and values, refer to the Tables of Error Codes for the IO Management Library.