30 DC motor driver module XN-322-1DCD-B35
30.3 Wiring
XN300 slice modules
06/16 MN050002 EN
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243
Relative or absolute counting
Tc (Time control), i.e., bit 11, defines whether the time value for the subse-
quences will be counted as a relative or absolute value. It is possible to use
both counting methods at different points within the output sequence. How-
ever, doing so is not recommended.
Bit 11 = 0: The pulse width is relative and is counted starting from the end of
the last sequence. The period always starts with sequence 1.
Bit 11 = 1: The pulse width is absolute and is counted starting when the
period begins. This means that the time specified for a sequence must be
longer than the time specified for the previous sequence.
Relative pulse width
Figure 130:
Four subsequences with pulses when using relative counting
a
Subsequence 1, e.g. Motor off
b
Subsequence 2, e.g. Operating direction right
c
Subsequence 3, e.g. Motor off
d
Subsequence 4, e.g. Armature short-circuit
Absolute pulse width
Figure 131:
Four subsequences with pulses when using absolute counting
a
Subsequence 1, e.g. Motor off
b
Subsequence 2, e.g. Operating direction right
c
Subsequence 3, e.g. Motor off
d
Subsequence 4, e.g. Armature short-circuit
④
③
②
①
t
P
A
t
④
③
②
①
t
P
t
P
Summary of Contents for XN300
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