Siemens SITRANS P500, Operating Instructions Manual, Page: 172 / 238

Functional safety
7.3 Settings
SITRANS P500 with HART
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Operating Instructions, 12/2014, A5E02344528-09
Operational reliability
According to IEC 61511-1, Section 11.4.4, the hardware fault tolerance (HFT) can be
reduced by one (values in brackets) for transmitters and final controlling elements with
complex components if the following conditions apply to the device:
● The device is proven in operation.
● The user can configure only the process-related parameters, e.g. control range, signal
direction in case of a fault, limiting values, etc.
● The configuration level of the firmware is blocked against unauthorized operation.
● The function requires SIL of less than 4.
See also
General functional safety ( http://www.siemens.com/safety )
Functional safety in process instrumentation ( http://www.siemens.com/SIL )
7.3 Settings
Introduction
This section details the following areas:
● Settings for devices with functional safety
● Measures you must take when using the device for functional safety.
Procedure
1. Setting safety-relevant parameters
2. Checking the safety function
3. Activating button lock and access protection
Setting safety-relevant parameters
Parameter name Set parameter value
Low saturation limit 3.8 mA
High saturation limit 20.5 mA
Lower fault current value 3.6 mA
Upper fault current value 22.8 mA
See Setting the current limits (Page 157).