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Idiomas disponibles
Idiomas disponibles
● "Inconsistent safety program"
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 IM 151-7 F-CPU probabilities of failure.
F-compatible IM 151-7 F-
CPU
6ES7151-7FA21-0AB0
Delay of the user program in the case of station failure of the DP master
Please note the following when using the IM 151-7 F-CPU 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
IM 151-7 F-CPU, 6ES7151-7FA21-0AB0, edition 01, as of firmware V3.3
A5E03435851-02, 05/2011
4
Operation in Low Demand
Mode
low demand mode (average
probability of failure on
demand)
< 1.5E-05
< 3E-05
Operation in High Demand
or Continuous Mode
high demand/continuous
mode (probability of a
dangerous failure per hour)
< 3.5E-10
< 3.5E-10
IM 151-7 F-CPU, 6ES7151-7FA21-0AB0, edition 01, as of firmware V3.3
Proof-test interval
10 years
20 years
A5E03435851-02, 05/2011
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