Siemens SIMATIC S5 IP 281 Equipment Manual page 164

Technical Specifications
8.7.4 Time Relationships for HW Gate Control
Counting edge =
rising edge
Gate control
via pulse
{
Gate control
via level
Counting edge =
rising and
falling edge
Gate control
via pulse
{
Gate control
via level
1 = First pulse to be counted
2 = Last pulse to be counted
3 = First pulse not to be counted
T1 min = Dlmax – Emin + 0.4 ~sec
T2min = Emax – Dlmin + 0.6 @ec
The tables in section 8.7.3 apply.
Although non–adherence to the time relationships will not cause undefined states on the module,
the munter may deviate by 1 (more than 1 for high frequencies on the encoder input and large
filter constants on the Dl).
8 – 12
1
T1
i i
i i
- - - -
. . . .
. . . .
I
, I
I
-
R 11192
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