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    The ident system CIS is mostly used in installation as a read-only system
    with the 4-bit parallel interface. The advantage of the parallel interface is
    simple integration into the control system and the transparent representation
    and outputs (I/O), represent at a point in time a related hex digit using
    high/low levels (24 V/0 V). After the read station is switched on, the level
    on all 4 wires is initially high. If a data carrier now enters the operating
    distance of the read station, fi rst the data are automatically transferred
    and on again. In the case of the CIS3A-Mini it is also possible to delete
    the temporary memory in the read station via a reset pulse. If there is
    a data carrier in front of the read head, the data are transferred again
    automatically.    temporarily. In the second step, the data are actively retrieved from the
    memory in the read station by the control system. For the second step
    it is no longer necessary for the data carrier to be in the read head's
    operating distance.
    The read station saves the data from a data carrier read until the next
    data carrier is fed to the read station or the read station is switched off
    available in the memory on the read station. If in the case of the CIS3/CIS3A
    In the fi rst step, it is signaled to the control system via the high level on
    the STROBE output on the read station that there is a data carrier in the
    operating distance and new data are available in the memory on the read
    of the data. Quick and therefore low-cost integration into any type
    of PLC is possible.
    The 4 data wires, which are connected directly to the PLC via inputs
    station. The STROBE output is set to the high level when the fi rst 4 hex
    digits on the CIS3/CIS3A and the fi rst 8 hex digits on the CIS3A Mini are
    more than 4 hex digits are required in the application, it is necessary to
    wait long enough until all the digits have been transferred to the memory
    in the read station (see pulse diagram in the manual for the read station).
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