Eaton easySafety Manual page 522

Safety function blocks
518
Error detection and acknowledgement
The function block detects the fact that the maximum
permissible rotation frequency (1000 Hz) has been
exceeded, or the failure of the sensors at device inputs IS1
and IS2.
Error
Maximum permis-
sible rotation
frequency exceeded
Failure of sensors
General information on Errors and how easySafety reacts to
them, is provided in the section "Diagnostics using the ER
contact" on page 622.
Example
The standstill of a machine is to be detected and transferred
to marker MS01 as a signal for further processing. A stand-
still is recognised at a rotation speed of less than 10 rpm.
Two inductive proximity switches in conjunction with a cam
disk with 12 cams on the shaft measure the speed.
The zero speed monitoring function is always active
(ZM01SA = 1).
The rotation frequency to be set on the easySafety is:
12 x 10 rpm / 60 = 2 Hz.
This looks as follows in the electrical circuit diagram:
02/16 MN05013001Z EN
Error acknowledgement
Drop out of coil ZM..SA for activation of
the safety function block
Drop out of coil ZM..SA for activation of
the safety function block