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ySafety internal
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02/16 MN05013001Z EN
Reaction time of an
ea
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ySafety device
The easySafetyreaction time of the device is often required to
calculate the time of your safety application. For example,
you need this if you have to calculate the distance between
a separating or non-separating guard and the hazardous
area of a machine (see also EN 294/ISO 13852 and EN 811/
ISO 13853).
The reaction time is calculated from the maximum circuit
diagram processing time and the output delay. If, however,
the maximum circuit diagram processing time is shorter than
the error detection time of the easySafety device, which is
150 ms, the reaction time is calculated only from the error
detection time and the output delay.
The output delay is:
• For transistor output (QS): 1 ms
• For relay output (QR): 50 ms (worst case scenario)
The circuit diagram processing times stated in Table 30 are
worst case values. For example, two cycles are taken into
account for the processing times to ensure that the actual
input image is processed in the circuit diagram. These times
may be actually be shorter, however they are never longer.
Only determine the reaction time for calculating your appli-
cation in the following manner:
X
Determine the number of the last processed rung in your
safety circuit diagram and in your standard circuit diagram
respectively, and add both values together. The empty
rungs located in front of the last processed rung, which
you can use as comment aids, for example, are also added
to the calculation.
X
Refer to Table 30 for the maximum circuit diagram
processing time.
If the calculated circuit diagram processing time is shorter
than the detection time of the easySafety device (150 ms),
the following applies in regard to the reaction time:
Reaction time = 150 ms + output delay
Содержание easySafety
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