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Dynamization
Dynamization of Inputs
Dynamization is used for cross circuit detection between two safety-related inputs or between one
safety-related input and the Start input or a cross-circuit to an external power supply unit or to
ground. Dynamization is implemented by means of periodically generated test pulses at the control
outputs of the safety-related inputs S#1 and of the start input Y1.
Whether dynamization of the safety-related inputs is used depends on the selected application
(see page
function
The following diagram illustrates the dynamization principle and timing:
The same logic applies to Y1 and Y2.
Designation
T
DDUR
T
DINT
T
DDEL
T
DPSHL
HR9Z-B2192 8/2020
57) .
Value
Explanation
2 ms
Duration of the test pulse. The duration of the test pulse is the
time between the start of the test pulse and the end of the test
pulse.
500 ms
Interval between test pulses. This interval is the time between the
start of a test pulse and the start of the next test pulse at the same
control output.
40 ms
Maximum delay of test pulse. This delay is the maximum time
between the start of the test pulse at the control output and the
associated input channel, that is, the maximum time during which
the input expects to "see" dynamization.
At least 70 ms
Phase shift of test pulses. This time is the phase shift between
the test pulses at the control outputs of the safety-related inputs.
Engineering
43
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