ABB FEN-31 User Manual page 25

Note: The DIP switches are OFF by default. Turn them ON only if
an encoder that specifically needs a pull-up or pull-down resistor
is used.
The configuration of the DIP switches is shown in the table below:
Encoder type
Differential push-pull
Single-ended push-pull
Open collector (sinking)
Open emitter
1 2 3
off off off
off off off
on on on
on on on
4 Resistors Notes
connected
off no Default setting
off no Default setting
off yes Resistors pull up
(A+, B+, Z+)
on yes Resistors pull down
(A+, B+, Z+)
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Installation