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Glossary
RTU mode
Remote Terminal Unit
The RTU mode is used for communication between the PLC and an IBM–compatible PC.
RTU works with 8 data bits.
Runtime Error
Errors that occur while the program is processing on the PLC, in SFC objects (e.g.
Steps) or FFBs. These are, for instance, value range overflows in counters or time errors
in steps.
S
SA85 module
The SA module is a Modbus Plus adapter for IBM–AT or compatible computers.
Section
A section, for instance, can be used to describe the mode of operation of a technological
unit such as a motor.
A program or DFB consists of one or several sections. Sections can be programmed with
the IEC programming languages FBD and SFC. Within a section, only one of the listed
programming languages can be used.
In Concept, each section has its own document window. However, to have a better
overview, it is recommended to subdivide a large section into several smaller ones. The
scroll bar is used to move around within a section.
Separator format (4:00001)
A colon (:) separates the first digit of the reference from the following five–digit address.
Sequential Function Chart (SFC)
The SFC language elements allow the subdividing of a PLC program organization unit
into a set of steps and transitions which are interconnected through directional links.
Each step is associated with a set of actions, and each transition is linked with a
transition condition.
Serial ports
Serial ports (COM) transfer information bit by bit.
SFC
see Sequential Function Chart
ST
refer to Structured Text (ST)
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