Siemens SIMATIC ET 200S Operating Instructions Manual page 130

1Count5V
3.6 Count Modes
Main Count Direction
With the main count direction, you assign which RESET states (status following parameter
assignment) the load value and count value can take on. It is thus possible to create
incrementing or decrementing count applications. The assigned main count direction has no
effect on the direction evaluation when the count pulses are detected.
RESET States of the Following Values after Parameter Assignment
Table 3- 2 RESET States
Value
Load value
Count value
Comparison value 1 and 2
Latch value
Isochronous Mode
In isochronous mode, the 1Count5V accepts control bits and control values from the control
interface in each bus cycle and reports back the response in the same cycle.
In each cycle, the 1Count5V transfers the count or latch value that was valid at time T
the status bits valid at time T
A count controlled by hardware input signals can only be transferred in the same cycle if the
input signal occurred before time T
(See Isochronous Mode (http://support.automation.siemens.com/WW/view/en/15218045)
function manual)
130
Main count direction
None
Up
Down
None
Up
Down
None
Up
Down
None
Up
Down
.
i
.
i
RESET state
0
0
Assigned high counting limit
0
0
Assigned high counting limit
0
0
Assigned high counting limit
0
0
Assigned high counting limit
Operating Instructions, 06/2010, A5E00124867-07
and
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Technological Functions