ADLINK PCI-8154 - Manual (Page 85)

Operation Theory 75
4.4.4 Positioning Start switch
The positioning start switch is used to move a specific position
when it is turned on. The function is shown as below.
4.4.5 Counter Clear switch
The counter clear switch is an input signal which makes the
counters of motion controller to reset. If users need to reset a
counter according to external command, use this pin as controlling
source.
4.4.6 Counter Latch switch
The counter latch switch is an input signal which makes counter
value to be kept into a register when this input active. If users need
to know counter value at the active moment of one input, they can
connect this pin to catch that.
4.4.7 Emergency stop input
Our motion controller provides a global digital input for emergency
situation. Once the input is turned on, our motion controller will
stop all axes’ motion immediately to prevent machine’s damage.
Usually, users can connect an emergency stop button to this input
on their machine. We suggest this input as normal closed type for
safety.