Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP User Manual

Memory concept
6.5 Technology data blocks
Caution
Data on a SIMATIC Micro Memory Card can be corrupted if you remove the card while it is
being accessed by a write operation. In this case, you may have to delete the MMC on your
PG, or format the card in the CPU.
Never remove an MMC in RUN mode. Always remove it when power is off, or when the CPU
is in STOP state, and when the PG is not a writing to the card. When the CPU is in STOP
mode and you cannot not determine whether or not a PG is writing to the card (e.g.
load/delete block), disconnect the communication lines.
Reference
For detailed information on SFC 82, refer to the System Software for S7-300/400, System
and Standard Functions
Reference Manual, or directly to the STEP 7 Online Help .
6.5 6.5 Technology data blocks
Introduction
The integrated technology of the Technology CPU provides current information on the status
and on the values of the technology objects via the technology data blocks. To achieve
especially short response times, the technology data blocks can be evaluated in OB 65.
Processing sequence
When technology objects are configured, S7-Technology creates data blocks in the block
folder.
If you initiate jobs to drives using a technology function, you read the states and values in the
associated technology data block.
Reference
For further information, refer to the S7-Technology manual.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
6-17

Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP Specifications

General

Programming Language	STEP 7
Power Supply	24 V DC
Number of DP masters	1
Processable Technology objects	Yes
Number of counters	256
Number of timers	256
S7 communication	Yes
Number of connections for S7 communication, max.	16
PG/OP communication	Yes
Global data communication	Yes
Integrated DP interface	Yes
Integrated PROFINET interface	No
SIMATIC Computing Platform	No
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Communication	PROFIBUS DP
Cycle Time	0.1 ms
Engineering with	STEP 7
Backup available	Yes
Transmission rate, max.	12 Mbit/s