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6.2 Parameterization of the safe inputs
The individual input pairs of a Smart Element can be parameterized differently, which means
that different safety integrity levels (SIL, SILCL, Cat., PL) can be achieved.
The safe inputs are parameterized in pairs.
Table 6 - 1 describes the parameterization
options.
Table 6 - 1 Parameterization of each input pair
Parameterization Value range Comment
Assignment – Both not used
– Used, 1-channel both
– Used, 2-channel equivalent
– Used, 2-channel non-equiva -
lent
Parameterize the input pairs in pairs.
In 2-channel operation, the inputs have a fixed assignment
to one another:
See “Two-channel equivalent assignment” on page 39 and
“Two-channel non-equivalent assignment” on page 41 .
The input information of inputs parameterized for 2-channel
operation is mapped to one bit. The unused bits are always
set to “0”.
In 1-channel operation, the inputs can operate inde
-
pendently of one another.
See “Single-channel assignment” on page 39 .
Filter time (t
Filter
) – 1.5 ms
– 3 ms
– 5 ms
– 15 ms
The filter time is used to suppress interference for the input
signals.
Select the filter time so that the duration of the input signal is
greater than the filter time.

WARNING: The filter time affects the response time of
the safety function.
See
“Processing time of the input in the event of a safety
demand” on page 23 .
Symmetry – Disabled
– 100 ms
– 1 s
– 5 s
Parameterization is only to be applied, if the input pair is
parameterized for 2-channel operation.
See
“Symmetry and start inhibit” on page 42 .
Start inhibit due to
symmetry violation
– Disabled
– Enabled
Disabled: only a diagnostic message is generated in the
event of symmetry violation.
Enabled: a diagnostic message is generated in the event of
symmetry violation. In addition, the affected input pair is set
to the safe state.
See
“Symmetry and start inhibit” on page 42 .
Cross-circuit monitor -
ing
– Disabled
– Enabled
As soon as cross-circuit monitoring is enabled for an
assigned input pair, clock outputs OUT_T1 and OUT_T2 are
clocked. Otherwise, the clock outputs are enabled without
clocking.
See
“Cross-circuit detection” on page 44 .
The default values are shown in bold .