Siemens SIMATIC S7-300 Información Del Producto página 4

Restrictions with SFC 22 "CREAT_DB", SFC 23 "DEL_DB" and SFC 82 "CREA_DBL"
F-DBs can neither be created nor deleted.
Restrictions with SFC 83 "READ_DBL" and SFC 84 "WRIT_DBL"
The target address may not point to an F-DB.
Restrictions when configuring the retentive behavior of data blocks
The configuration of retentive data blocks is not supported for F-DBs.
This means that the current values of the F-DBs will not be retentive in the event of Power OFF/ON and Restart (STOP-
RUN) of the F-CPU. The F-DBs retain the initial values from the loading memory.
In the block properties of the F-DBs, the "Non-Retain" check box is activated and thus grayed out.
Probabilities of Failure
Below are the values for the CPU 315F-2 DP probabilities of failure:
F-compatible CPU 315F-2
DP
6ES7315-6FF04-0AB0
Operation with the safety protector 6ES7195-7KF00-0XA0
WARNING
The safety protector (order number 6ES7195-7KF00-0XA0, product version 01 and 02), unlike other modules, must not be
inserted in the same rack as the F-CPU. This restriction does not apply to safety protector product versions 03 and higher.
Delay of the user program in the case of station failure of the DP master
Please note the following when using the CPU 315F-2 DP as I-Slave: A station failure of the DP master (for example by line
interruption of the PROFIBUS connection) can extend processing of the user program in the I-Slave due to error handling by
up to 20 ms.
Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
CPU 315F-2 DP, 6ES7315-6FF04-0AB0, Edition 01, as of firmware V3.0
A5E02486920-04, 05/2011
4
Operation in Low Demand
Mode
low demand mode
(average probability of
failure on demand)
< 2E-05
< 4E-05
Operation in High Demand
or Continuous Mode
high demand/continuous
mode (probability of a
dangerous failure per hour)
< 5E-10
< 5E-10
CPU 315F-2 DP, 6ES7315-6FF04-0AB0, Edition 01, as of firmware V3.0
Proof-test interval
10 years
20 years
A5E02486920-04, 05/2011