User Documentation

Assumptions and restrictions for use of the product
10 1482900000/01/11.2017
5.3 Associated equipment
5.3.1 RTD sensor wiring
If a 2-wire or a 3-wire connection for RTD is selected, the end user must ensure that the applied sensor
wiring does not introduce failures exceeding the requirements for the safety application.
5.3.2 Sensor errors
If Sensor error detection is disabled, if current input range 0...20 mA is selected or if input type Pt10, Pt20 or
Pt50 is selected, the end user must ensure that the applied sensor including wiring has a failure rate
qualifying it for the safety application without sensor error detection enabled. The Pt10, Pt20 and Pt50 input
types only relates to short-circuited sensor detection.
5.3.3 Process calibration
If a process calibration is taken into SIL-mode operation, it is mandatory that the accuracy of the device (and
sensor, if applicable) is tested by the end user after SIL-mode is entered, in addition to the normal functional
test (refer to chapter 16.5 "Safety-related configuration user responsibility" on page 31).
5.3.4 Analogue output
The connected safety PLC shall be able to detect and handle the fault indications on the analogue output of
the ACT20X-(2)HTI-(2)SAO converter by having a NAMUR NE43-compliant current input.
5.4 Failure rates
The basic failure rates from the Siemens standard SN 29500 are used as the failure rate database. Failure
rates are constant; wear-out mechanisms are not included. External power supply failure rates are also not
included.
5.5 Safe parameterization
The user is responsible for verifying the correctness of the configuration parameters (refer to chapter 16.5
"Safety-related configuration user responsibility" on page 31). Manual override may not be used for safety
applications.
5.6 Installation in hazardous areas
The IECEx installation drawing, ATEX installation drawing and FM installation drawing shall be followed, if
the products are installed in or connected to hazardous areas.