ADLINK PCI-8158 - Manual (Page 84)

74 Operation Theory
4.4.5 Counter Clear switch
The counter clear switch is an input signal which makes the
counters of motion controller to reset. If you 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 you 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 motion of the axes immediately to prevent machine’s dam-
age. Usually, you can connect an emergency stop button to this
input on their machine. We suggest this input as normal closed
type for safety.
4.5 The Counters
There are four counters for each axis of this motion controller.
They are described in this section.
X
Command position counter: counts the number of output
pulses
X Feedback position counter: counts the number of input
pulses
X
Position error counter: counts the error between command
and feedback pulse numbers.
X
General purpose counter: The source can be configured as
the command position, feedback position, manual pulse, or
half of the ASIC clock.
X
Target position recorder: A software-maintained target posi-
tion value of latest motion command.