Control Techniques UD70, User Manual

Page: 130 / 154

UD70
Issue code: 70nu2
8-32 Features
Cam Table
When using the cam table, S-ramps cannot be used for position control, so
_ Q32%.8 is always reset to 0. When starting the cam table using the
auxiliary marker pulse, _ Q32%.4 is set to 1 and _ Q32%.12 is reset to 0 when
the marker pulse is detected. If the cam table has not been initialised
correctly,
_ Q32%.4 cannot be set.
Reset
When a profile generator reset is requested using _ Q32%.17, all registers are
reset. _ Q32%.17 is reset to 0 when all registers have been cleared.
8.12 Timer/Counter unit
DIGIN 1
D
1
M[0.2]
Control
&
&
DIGIN 0
C
EN
Timer
Reload
TI
16-bit up/down counter
TE
Event
500kHz
4MHz
u/d
Logic diagram for the timer/counter
A hardware timer/counter built into the
UD70
has the following features:
•
Count rate selectable between 500kHz and 4MHz.
•
The count direction can be selected.
•
The counter can be gated by an external signal source.
•
The
EVENT
task can be initiated when the timer/counter
over/underflows, or by applying logic 1 to input 0 DIGIN (digital
TTL
).
•
The value of the timer/counter unit can be frozen by applying logic 0
to input 0
DIGIN
.
•
The timer/counter unit can be clocked by a 1-to-0 transition at
input 0
DIGIN
. Maximum input frequency is 1 MHz.