iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
Rev D1, Page 57/59
APPLICATION NOTES: PLC Operation
PLC Operation
ther the supply VDD nor the output pins, which are
There are PLCs with a remote sense supply which re- also monitored, must fall to below ground potential (pin
quire longer for the voltage regulation to settle. At the GND); otherwise the device is not configured and the
same time the PLC inputs can have high-impedance outputs remain permanently set to tristate.
resistances versus an internal, negative supply voltage
which define the input potential for open inputs.
In order to ensure that iC-MN starts with the PLCs
In this instance iC-MN’s reverse polarity protection fea- mentioned above pull-up resistors can be used in the
ture can be activated as the outputs are tristate during encoder. Values of 100 kΩ are usually sufficient; it
the start phase and the resistances in the PLC deter- is, however, recommended that PLC specifications be
mine the pin potential. During the start phase nei- specifically referred to here.
ICHAUS [ IC-HAUS GMBH ]
