ipf electronic opti-check, Техническая документация инструкция

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Technical Documentation
opti-check
v2.8.2-K11
235/332 ipf electronic GmbH
Lüdenscheid, Germany
13.6.2 Bit serial job selection
Signal applied to the input
min.
max.
Result retention time T
1
10 ms 1,000 ms
For bit serial job switching, two digital inputs are required: digital inputs IN2 ("Bit serial job selection
– Clock")
and IN3 ("Bit serial job selection
– Data"). When inactive, high levels are applied to both lines. The levels of
the data line are set briefly to low and then returned to high to start the transfer.
The desired job number can then be transferred as a series of bits. The respective bits must be transferred
with the following levels on the data line:
Value Level on the data line
0 High
1 Low
As soon as a rising edge is detected on the clock line, the corresponding bit is read on the data line. The
status of the data line must be held constant for the result retention time T
1
and may only change when a low
level is set on the clock line.
When all 8 bits have been transferred in this way, the inactive state is restored.
We recommend that switching to the next bit on the data line should be done simultaneously with activation
of the falling edge on the clock line.
NOTE
This description applies when the parameters of the inputs are set to "active high". If you
have configured an input as "active low", you must invert the specified levels for these
inputs in the description.
You should also make sure that you have made the following settings for bit-serial job
selection:

In Job selection you must set the source "Digital inputs".

For digital I/Os the parameters for the digital inputs 2 and 3 must be set as "Bit
serial job selection
– Clock" or "Bit serial job selection – Data".