L9_SKP: Skipping Networks (1 Node)
(Original Document)
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Function Description
The L9_SKP function block is a standard function block. It should be used carefully.
The L9_SKP function block is used to reduce the scan time by not solving a portion of the logic. The L9_SKP function block causes the logic scan to skip specified networks in the program.
The SKP function can be used to bypass seldom used program sequences.
The L9_SKP function block allows you to skip a specified number of networks in a LL984 program. When it is powered, the L9_SKP operation is performed on every scan. The remainder of the network in which the function block appears counts as the first of the specified number of networks to be skipped. The CPU continues to skip networks until the total number of networks skipped equals the number specified in the function block or until a segment boundary is reached. A L9_SKP operation can not cross a segment boundary.
A L9_SKP function block can be activated only if you specify via Project Settings → Program → Languages → LL984 → SKP enabled that skips are allowed.
If inputs and outputs that normally effect control are unintentionally skipped (or not skipped), the result can create a hazardous condition for personnel and equipment.
WARNING
UNINTENDED EQUIPMENT OPERATION
  • Only personnel who are thoroughly knowledgeable of the machine, the application, and the effects of the logic program on the application should consider using the L9_SKP function block in a ladder logic program.
  • Carefully analyze the area of logic to be skipped (or unskipped), and understand how the affected inputs and outputs can interact throughout the application.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Representation
Parameters
Input Pin
Name
Data Type
Address Range
Meaning
Top
ENABLE
BOOL
–
ON initiates a skip network operation when it passes power. A L9_SKP operation is performed on every scan while the input is ON.
Node
Node Type
Name
Data Type
Address Range
Meaning
Top
IN
NUM
UINT
%IW, %MW
The value entered in the node specifies the number of networks to be skipped.
The value can be
  • specified explicitly as an integer constant
  • stored in a %IW input word
  • stored in a %MW memory word
The node value includes the network that contains the L9_SKP function block. The nodal regions in the network where the L9_SKP resides that have not already been scanned will be skipped; this counts as one of the networks specified to be skipped. The CPU continues to skip networks until the total number of networks skipped equals the value specified.
A value of zero skips the remainder of networks in the current segment.