Eaton easySafety Manual page 445

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.
Contact
OM..QS
OM..ER
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:
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.
• A wire break is indicated and the enable is removed if both
sensors have not switched.
OM, Maximum speed moni-
toring
Function
Enable (contact closed -> maximum speed not
exceeded)
Error message (contact closed -> Error)
Overspeed monitoring, rotation frequency
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