Program instructions
7.13 Program control
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
347
S stack and logic stack interaction
The figure shows the S stack and the logic
stack and the effect of executing the
Load SCR instruction.
Controlling program flow with SCR segments
The main program consists of instructions that execute sequentially once per scan of the
PLC. For many applications, it may be appropriate to logically divide the main program into a
series of operational steps that mirror steps within a controlled process (for example, a
series of machine operations).
One way to logically divide a program into multiple steps is to use SCR segments. SCR
segments can divide your program into a single stream of sequential steps, or into multiple
streams that can be active simultaneously. It is possible to have a single stream conditionally
diverge into multiple streams, and to have multiple streams conditionally re-converge into a
single stream.
Содержание SIMATIC S7-200
Страница 30: ...Product overview 1 7 Programming software S7 200 SMART 30 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 267: ...Program instructions 7 6 Counters S7 200 SMART System Manual V2 3 07 2017 A5E03822230 AF 267 HSC modes 3 and 4 ...
Страница 394: ...Program instructions 7 18 Subroutine S7 200 SMART 394 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 425: ...Communication 8 5 PROFIBUS S7 200 SMART System Manual V2 3 07 2017 A5E03822230 AF 425 ...
Страница 786: ...Technical specifications A 11 S7 200 SMART cables S7 200 SMART 786 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 798: ...Error codes C 4 PLC fatal error codes S7 200 SMART 798 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 848: ...Ordering information F 6 Human Machine Interface devices S7 200 SMART 848 System Manual V2 3 07 2017 A5E03822230 AF ...