Safety function blocks
444
02/16 MN05013001Z EN
Example - Architecture of Category 2 according to
EN ISO 13849-1
The speed of a shaft is required to not exceed 400 rpm. Two
inductive proximity switches in conjunction with a cam disk
with 10 cams on the shaft record the speed.
The function block is required to remove the enable for
driving the shaft as soon as the maximum speed is exceeded.
The drive must stand still before the function block allows a
re-enabling via OM01RE. This is implemented using the ZM
zero monitoring function block. The wiring of the ZM func-
tion block is not explained further in this example. Further
information can be found in section “ZM, zero (standstill)
monitoring”, page 509.
The connections are implemented as follows in this example:
• The feedback loop including Reset button to IS9.
• Both sensors to IS1 and IS2.
• Enabling contact OM..QS switches device output QS1.
• The coil SA is always active for the safe activation in this
example.
The rotation frequency to be set on easySafety:
10 x 400 rpm / 60 = 66 Hz.
This looks as follows in the electrical circuit diagram:
Summary of Contents for easySafety
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