Point-To-Point Connection; Data Consistency - Siemens CPU 31 Series Technical Data Manual

Reference
Further information
• on configuring in STEP 7 is found in the
• of a basic nature is contained in the
• about the TeleService adapter is available under article ID 20983182 on the Internet URL
• on SFCs, refer to
• on communication are found in the
3.2.8

Point-to-point connection

Properties
PtP communication enables you to exchange data via serial port. PtP communication can be
used to interconnect automation devices, computers or communication-capable systems of
external suppliers. The function also allows adaptation to the protocol of the communication
partner.
Reference
Further Information
• on SFCs are found in the
• on communication are found in the
3.2.9

Data consistency

Properties
A data area is consistent if it can be read or written to from the operating system as a
consistent block. Data exchanged collectively between the stations should belong together
and originate from a single processing cycle, that is, be consistent. If the user program
contains a programmed communication function, for example, access to shared data with X-
SEND/ XRCV, access to that data area can be coordinated by means of the "BUSY"
parameter itself.
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
STEP 7
manual
http://support.automation.siemens.com.
Instruction list
For further information refer to
reference manual.
For detailed information, refer to the
Functions
Reference Manual.
Configuring Hardware and Connections in
Communication with SIMATIC
.
STEP 7 Online Help
Communication with SIMATIC
Instruction list
.
STEP 7 Online Help
Communication with SIMATIC
Communication
3.2 Communication services
Manual.
System and Standard Functions
or
Manual.
System and Standard
, or to the
Manual.
3-15