Technical data
Safety Integrated Functions
8.9 Acceptance test and acceptance report
Function Manual
458 Function Manual, 06/2012, 6SL3097-4AB10-0BP4
Dimensioning of load resistors - example 1:
According to manufacturer documentation, the leakage current of an F-DO on a safety PLC
is 1 mA for the P and F channel; in other words, it is 0.5 mA higher than is permissible for the
F-DI.
The necessary load resistance is therefore R = 5 V/0.5 mA = 10 kΩ.
At maximum supply voltage, the power loss for this resistor is:
P = (28.8 V)²/R = 83 mW. The resistor is to be permanently dimensioned for this power loss.
Dimensioning of load resistors - example 2:
If further conditions for the digital output (e.g. a minimum load or a maximum load
resistance) are specified in the manufacturer documentation, these must also be taken into
account.
For example, a load between 12 Ω and 1 kΩ is specified for the SIMATIC ET200S 4 F-DO
I/O module (6ES7138-4FB02-0AB0).
Therefore, two additional 1 kΩ load resistors and a continuous load capacity of at least P =
(28.8 V)²/R = 830 mW are required to connect an F-DO of this kind to a CU305 F-DI.
If a controlled 24 V power supply is used (e.g. SITOP), a resistor with a significantly lower
power loss is sufficient.
Note
Open-circuit detection for pull-up resistors
If the pull-up resistor has a resistance greater than 1 kΩ, open-circuit detection is no longer
reliable and has to be switched off.
8.9 Acceptance test and acceptance report
8.9.1 General information
The acceptance test requirements (configuration check) for electrical drive safety functions
emanate from DIN EN 61800-5-2, Chapter 7.1 Point f). The acceptance test "configuration
check" is named in this standard.
● Description of the application including a picture
● Description of the safety relevant components (including software versions) which are
used in the application
● List of the PDS(SR) [Power Drive System(Safety Related)] safety functions used
● Results of all tests of these safety functions, using the specified testing procedure
● List of all safety relevant parameters and their values in the PDS(SR)
● Checksum, test date and confirmation by testing personnel