SimStep
Manual - 3400 Iss. D
7
th
June 2004
page 15
4.3.1 Datum Position
The
datum
position is detected as the
datum stop
switch opens. It is also summed with
the encoder
index
signal (if fitted). For further information, refer to the Datum Search
Strategies section (2.13) of the PM600 manual.
4.3.2 Using Over-travel limits as datum inputs.
In applications where space is limited, the over-travel
limit switches may also be used as the datum stop
switch. In the example shown the lower limit switch is
also connected to the datum stop input and the
controller is configured to utilise the high-speed
datum approach facility.
Fig. 4.6 Limit/Datum Connections
0VLL
+VLL
Upper Limit
+VLL
Lower Limit
+VLL
Datum Approach
+VLL
Datum Stop
+VLL
Abort stop
