Encoder – Mounting and Connection
66
ATM60 / ATM90 / KHK53
Dec 2021
10.4.2 Counting Direction
The counting direction can be set with DIP switch S1 (8-8).
OFF (0)
CW
ascending
Factory setting (default)
ON (1)
CCW
descending
The setting 'ON' always has priority over the setting via software. Only the DIP
switch setting 'OFF' permits a change by telegram.
The view for determining the counting direction is device-dependent:
•
ATM90 looking at the baseplate
•
ATM60 looking at the shaft
•
KHK53 from the first material measure
10.4.3 Preset Function
The encoder is set to a special, predefined value if the PRESET function is executed by press-
ing pushbutton S3. –- The factory default value is zero (0).
The preset function is not intended for dynamic adjustment processes. The func-
tion is meant for electronic adjustment during commissioning, to allocate a certain
position value to any mechanical shaft position of the encoder. In case of con-
stantly recurring activation of the preset function, the corresponding memory lo-
cations in the EEPROM are destroyed, with time lapsing!
The use of the preset function leads to a change in the position value output by
the encoder. This could cause an unexpected movement which may lead to
damage of the system, other objects or bodily harm.
10.4.4 Bus Termination
The bus termination can be performed with DIP switch S2. The factory preset (default) is 'OFF’.
If the encoders are wired in 'line topology', the internal termination resistor must only be
switched at the two
end points of the line
(the two – physically – most distant points). Thus, in
this configuration, the switches for the bus termination resistor shall be switched to ‘ON’
always
at the last bus subscriber of the line
.
If the bus is terminated externally, the DIP switches S2 must generally be in the ‘OFF’ position.