Io Controller Mode With S7-400; Multicomputing Mode - Assigning The Cp To The Cpu (Step 7 V5.5); Programming - Siemens S7-300 Configuration Manual

6.3

IO controller mode with S7-400

6.3.1

Multicomputing mode - assigning the CP to the CPU (STEP 7 V5.5)

If you use the CP in an S7 station with several CPUs (multicomputing) for PROFINET IO
operation, you must assign the CP to a CPU in the configuration.
Note
Note the following points:
• CP slot in PROFINET IO mode
• CPU "startup" configuration when using the IE/PB Link PN IO
6.3.2

Programming

No special program blocks are required for the basic functions of the PROFINET IO mode.
For acyclic communication with the PROFINET IO devices using data records and for
special additional functions, the following program blocks are available on the CPU:
RDREC (SFB 52)
WRREC (SFB 53)
RALRM (SFB 54)
RD_DPAR (SFB 81)
GEO_LOG (SFC 70)
LOG_GEO (SFC 71)
For a detailed description of these program blocks, refer to the "System Software for S7-
300/400 System and Standard Functions" manual /13/ (Page 231).
Assignment of an initial value with consistent PROFINET IO user data > 32 bytes
If you have consistent PROFINET IO user data areas > 32 bytes, the system does not
assign initial values. You should therefore set the initial value for all PROFINET IO user data
areas > 32 bytes using the corresponding error OBs.
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
PROFINET IO operation is possible only with one CP located in the central rack.
If you use the IE/PB Link PN IO as a PROFINET IO device, select the option:
"Startup when expected/actual config. differ" for the CPU in the "Startup" parameter
group.
Otherwise your system will not start up automatically after power up or following a power
outage.
Read data record
Write data record
Receive alarm
Read predefined parameters
Identify the start address of a module
Identify the slot belonging to a logical address
CP as PROFINET IO controller
6.3 IO controller mode with S7-400
Meaning
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