Safety function blocks
516
02/16 MN05013001Z EN
Memory requirement
The ZM function block requires 36 bytes of memory.
Operation of the function block
A gear or cam wheel and two PNP sensors are required to
measure the rotation frequency.
Figure 272:
Zero speed monitoring: rotation frequency meas-
uring
• A wire break is indicated and the enable is removed if both
sensors have not switched.
• If both function block coils receive a synchronous signal, a
fault is indicated and the enable may possibly be removed.
• After each change of easySafety into operating state RUN
the two sensors can issue the same level without a fault
message being generated. In operating mode AST contact
ZM..QS is closed at that time.
Only when the first edge is detected at one of the two
inputs IS1/IS2 does the function block signal a fault if both
sensors output the same level. Contact ZM..QS then
opens.
The speed is determined by the frequency measured. The
frequency depends on the number of pulses per revolution.
h
The proximity switches must be arranged so that at least
one sensor is actuated at any time, in order for the func-
tion block to detect that the encoders are connected and
that they are installed correctly.
Summary of Contents for easySafety
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