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Ladder is fine - until the job is math, recipes, or a real sequence. Then
you want Structured Text. This is the book on Siemens SCL that the S7-1200
and S7-1500 world has been missing: practical, current, and built around a
machine you actually program, not disconnected snippets. Structured Text with Siemens SCL takes you from your first FC to a complete,
running batch-mixing station - dose two ingredients by weight, mix, heat to
setpoint, discharge - assembled block by block in TIA Portal. Along the way
you learn the language properly: data types and declarations, expressions
and the type-conversion traps, IF/CASE/loops, structures and arrays, UDTs,
strings and time, and how FCs, FBs, and instance DBs really fit together.
Then you build the things SCL is actually great at: reusable device blocks,
CASE state machines that leave ladder sequencers in the dust, analog scaling
with NORM_X/SCALE_X, recipes as an array of a PLC data type selected at
runtime, and a fault layer with interlocks and safe states. Every line of
code is explained - never shown and left for you to guess - and every
example is written to run on PLCSIM, so you need no hardware on the bench.
Written for the ladder programmer moving to Structured Text, the automation
student, and the working engineer who wants clean, modern SCL. Current
TIA Portal, real examples, no filler.
You'll be able to:
- Read and write SCL fluently - declarations, expressions, control flow
- Use STRUCT, ARRAY, and UDTs to model machines and recipes
- Build reusable FBs (motor, valve) and call them cleanly
- Write CASE state machines for real sequences
- Scale analog, run IEC timers/counters from SCL, and handle faults
- Assemble a complete, optimized, symbolic S7-1500 program end to end
