Precautions for Correct Use
• If the safety task period changes due to changes in the safety program or other reasons, re-
calculate the safety reaction times.
• T
o calculate the safety reaction times, add the "delaying influences from the input filter delay
settings", the "safety program function block delay settings", and the "safety program
loopback connections".
Precaution for Conformance to ISO 13856-1:2013
If you use UM/UMA Safety Mats to build a pressure-sensitive protective device that conforms to ISO
13856-1:2013 (Safety of machinery -- Pressure-sensitive protective devices -- Part 1: General princi-
ples for design and testing of pressure-sensitive mats and pressure-sensitive floors), the NX-series
Safety Control Unit must meet the following condition in order to satisfy the requirement for the speci-
fied reaction time.
• The value of the FSoE watchdog timer in the NX-SIH400 that is connected to the UM/UMA Safety
Mats must be 42 ms or less.
8-1-2
Verifying Safety Reaction Times
Verify the calculated safety reaction times for all safety chains to confirm that they satisfy the required
specifications.
If a calculated safety reaction time exceeds the required specifications, consider the following meas-
ures and correct the software or hardware design.
•
Shorten the safety task period.
Example: Reduce the size of the safety program.
Reduce the number of
Safety I/O Units.
• Reduce EPI values of CIP Safety connections.
8 Calculating Safety Reaction Times
8 - 4
NX-series Safety Control Unit User's Manual (Z930)
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