Pilz PSSu E F AI I - Manual (Page 10)

Safety
Operating Manual PSSu E F AI I(­T)(­R)
21981­EN­05 10
3 Safety
3.1 Intended use
The module may be used for failsafe applications in system environment B (automation
system PSS 4000).
The modules PSSu E F AI I and PSSu E F AI I­T may be used as a safety component in
accordance with the Lifts Directive 95/16/EC, EN 81­1, EN 81­2 and EN 115­1.
The programmable safety system should be installed in a protected environment that meets
at least the requirements of pollution degree 2. Example: Protected inside space or control
cabinet with protection class IP54 and corresponding air conditioning.
The module provides an analogue input.
The analogue input meets the requirements of EN IEC 62061: SIL CL 2. To achieve higher
safety values, two analogue inputs will need to be used. PL e ( Cat. 4 ) and SIL CL 3 can
be achieved as a result of redundant input data.
The module guarantees functional safety, but not the safety of the entire process.
Please note the following during configuration and within the user program:
} With 1­channel operation, check the feasibilty of the measured value with an anticip­
ated measured value in order to detect measurement errors and offset errors on the
sensor, or to detect open circuit and short circuit between sensor and module.
} With 1­channel operation, use a sensor that meets the requirements of EN IEC 62061:
SIL CL 2.
} With 2­channel operation, check the feasibility by using two inputs and two sensors.
Take appropriate measures to avoid common cause errors in the sensor technology, by
using diverse sensors or a separate supply voltage for the sensors, for example.
} Monitor a defined measuring range to detect open circuit or short circuit: we recom­
mend 4 … 20 mA.
The measured value is attenuated through the input filter. At the cutoff frequency, the amp­
litude of the measured value is 70 % of the amplitude of the input signal.
We strongly recommend the use of the following function blocks:
} FS_AnalogueInputSingle (using one input)
} FS_AnalogueInputDual (using two inputs)
The function blocks contain "Feasibility check" (only on FS_AnalogueInputDual) and "Limit
value monitoring" functions, which enable you to detect errors in the sensor as well as the
wiring. For the "Range monitoring" function we recommend that you use a measuring range
of 4 … 20 mA.
The module PSSu E F AI I­T is suitable for use where there are increased environmental
requirements (see Technical Details).
The module PSSu E F AI I­R is suitable for use where there are increased environmental
requirements demanded by railway applications (see Technical Details).
Intended use includes making the electrical installation EMC­compliant. Please refer to the
guidelines stated in the "PSSuniversal Installation Manual". The module is designed for use
in an industrial environment. It is not suitable for use in a domestic environment, as this can
lead to interference.