Glossary
Glossary-14
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Start-up
RESTART mode is activated on a transition from STOP mode to RUN mode.
Can be triggered with the Mode Selector Switch or after Power On or with a
PG operation. With an S7-300 a complete restart is performed.
Segment
Bus segment
SFB
System function block (SFB)
SFC
System function
Signal module
Signal modules (SM) form the interface between the process and the PLC. There
are digital modules digital modules (I/O module, digital) and analog modules (I/O
module, analog).
Slave
A Slave can exchange data only on Master request.
System diagnostics
System diagnostics is a method used to recognize, evaluate and report PLC
errors. Examples of such errors: program error or module failure. System errors
can be displayed with LED indicators or in STEP 7.
System Function
This function (SFC) is
integrated in the CPU operating system. It can be called as required in the
STEP 7 user program.
System Function Block
The SFB is integrated in the CPU operating system. This function block can
be called as required in the STEP 7 user program.
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