Programming manual SCU-series
HB-37500-820-10-12F-EN SCU Programming manual
Page 22 of 252
Status: 19.03.2021
Function block diagram (Function block language)
Graphically oriented, descriptive programming language based on function blocks according to
IEC 1131 to visualize logical connections of the inputs and the outputs of the function blocks of
an SPC control. The function block diagram (FBD) shows the function blocks and their logical
link in graphical form.
Input / output
Position at a function block where the logical link with other function blocks is possible.
Logical connection
A certain connection between:
a.) an output and an input of a function block.
b.) an input of the SPC and an input of a function block.
c.) an output of a function block, and an output of the SPC
Connector
Connection point between the beginning and the end of a logical connection with an input and
an output of a function block.
Attribute
Non-graphical function of a function block. An attribute consists of an identifier and a value.
Routes
Horizontal and vertical connections of logical connections in a function block diagram to avoid
intersections with function blocks, and to connect logical connections with identical connectors
in an early phase (according to the distance and according to the target function block).
Signal list
Signal lines to and from the SPC in tabular form.
Signal cell
Eligible zone of the signal list that can be communicated.
List of SPC input signals
Signal lines of the SPC in tabular form. In
SafePLC
2
the user can fix the SPC entries. The
entries have unambiguous numbers, and must be assigned to the inputs of a function block.
List of SPC output signals
Signal lines of the SPC in tabular form. In
SafePLC
2
, the user can fix the SPC outputs. Like
the inputs, also the outputs have an unambiguous identification number.
Instruction list (IL)
Programming language similar to Assembler that can be loaded into a central SCU block.
SafePLC
2
serves to create a statement list on the basis of defined function blocks, their
attributes and their connections.