Glossary
Glossary-16
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Restart
When a CPU starts up (through the use of the mode selector, for example, or
when the power is switched on), either OB 101 (restart), OB 100 (reboot: warm
restart) or OB 102 (cold restart) is processed before cyclic program scanning (OB
1). It is essential for a restart that the CPU is up.
The following applies: All the data areas (timers, counters, memory markers, data
blocks) and their contents are preserved. The
³
process input image is read,
and processing of the STEP 7 user program is continued from the point at which
it was last terminated (STOP, power off).
Other types of startup are the
³
cold restart and reboot (
³
warm restart).
Retentivity
Data areas in data blocks, and also timers, counters and memory markers are
retentive when their contents are not lost upon a complete restart or POWER
DOWN.
S7 basic communication
Communication functions integrated in the CPU of the SIMATIC S7/M7/C7 that
can be called by the user. The call is executed in the user program by means of
³
system functions. The user data volume can be up to 76 bytes (small data
volume). S7 basic communication is implemented via
³
MPI.
S7 communication
Communication functions integrated in the CPU of the SIMATIC S7/M7/C7 that
can be called by the user. The call is executed in the user program by means of
³
system function blocks. The user data volume can be up to 64 Kbytes (large
data volume). S7 communication offers a network-independent interface between
devices of the type SIMATIC S7/M7/C7 and the programming device/PC.
Scan time
The scan time is the time required by the
³
CPU to scan the
³
user program
once.
SDB
³
System data block
Segment
³
Bus segment
Содержание Simatic M7-400
Страница 10: ...Preface x S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 122: ...Power Supply Modules 3 42 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 362: ...Analog Modules 5 146 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 384: ...Interface Modules 6 22 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 428: ...RS 485 Repeater 10 8 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 496: ...M7 400 Expansions 12 26 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 562: ...Interface Submodules 13 66 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 574: ...Parameter Sets for Signal Modules A 12 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 594: ...Diagnostic Data of the Signal Modules B 20 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
Страница 598: ...Spare Parts and Accessories C 4 S7 400 M7 400 Programmable Controllers Module Specifications A5E00069467 07 ...
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