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OM, Maximum speed moni-
toring
441
02/16 MN05013001Z EN
Contacts
The OM..QS contact in the safety circuit diagram enables
hazardous movement. It is closed for as long as the meas-
ured frequency is less than the entered maximum frequency.
If the OM..ER contact is wired in the standard and/or safety
circuit diagram, it indicates the presence of an error by
closing.
Memory requirement
The OM 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 223:
Overspeed monitoring, rotation frequency
• A wire break is indicated and the enable is removed if both
sensors have not switched.
Contact
Function
OM..QS
Enable (contact closed -> maximum speed not
exceeded)
OM..ER
Error message (contact closed -> Error)
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.
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