ADLINK PCI-8158 - Manual (Page 86)

76 Operation Theory
The value is calculated from command subtracting feedback posi-
tion.
If the ratio between command and feedback is not 1:1, the error
counter is meaningless.
This counter is a 16-bit binary up/down counter.
4.5.4 General purpose counter
The source of general purpose counter could be any of the follow-
ing:
1. Command position output – the same as a command
position counter
2. Feedback position input – the same as a feedback posi-
tion counter
3. Manual Pulse input – default setting
4. Clock Ticks – counter from a timer about 9.8MHz
4.5.5 Target position recorder
The target position recorder is used for providing target position
information. It is used in continuous motion because motion con-
troller need to know the previous motion command’s target posi-
tion and current motion command’s target position in order to
calculate relative pulses of current command then send results
into pre-register. Please check if the target position is the same
with current command position before continuous motion. Espe-
cially after the home function and stop function.