ETAS
Digital Input Channels ("DI" Connection)
ES930.1
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User Guide
35
Fig.
5
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4
Active and inactive Pulse
5.2.1.4
Period
A period starts with a state change or an inactive-active or an active-inactive
edge of the signal. It always consists of an active and an inactive pulse.
If the period starts with an inactive-active edge, then the period consists of the
sequence active pulse with subsequent inactive pulse. If the period starts with
an active-inactive edge, then the period consists of the sequence inactive pulse
with subsequent active pulse.
Fig.
5
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5
Period, starting with an active-inactive Edge
5.2.1.5
Cycle
A cycle encompasses a repeated succession of one or several periods.
A cycle describes an integer multiple of a period:
Cycle = n * period
A cycle can start with:
• an inactive-active edge
• an active-inactive edge
Fig.
5
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6
Cycle, starting with an inactive-active Edge and n=3
Inact ive
Pulse
Time
Input
Signal
Active
Inactive
Act ive
Pulse
Period
Time
Input
Signal
Act ive
Inact ive
Cycle
Time
Input
Signal
Active
Inactive
