Welcome to LOGO!
                   Dear Customer,
                   We thank you for the purchase of LOGO! and congratulate you on
                   your decision. With the LOGO! you have acquired a logic module
                   that meets the stringent quality requirements of ISO 9001.
                   LOGO! can be used in many fields of applications. Due to its high
                   functionality and yet easy operation the LOGO! offers you highly
                   efficient economies for almost any application.
            LOGO! documentation
                   This LOGO! Manual contains information relating to the installa-
                   tion, programming and the use of LOGO! 0BA3 Basic devices and
                   LOGO! 0BA0 expansion modules as well as their down compatibi-
                   lity to the previous Basic devices 0BA0, 0BA1 and 0BA2 (0BAx
                   are the last four characters  of the order number, used to distin-
                   guish the module series).
                   You can find information on wiring the LOGO! in the LOGO! ma-
                   nual and in the product info included with every device. Find sup-
                   plementary information re programming the LOGO! with the PC in
                   the Online Help for LOGO!Soft Comfort.
                   LOGO!Soft Comfort is the programming software for PCs. It runs
                                               
                   under Windows , Linux , and Mac OS X  and helps you to get
                   familiarized with your LOGO! and to write, test, print out and ar-
                   chive your programs, independent of the LOGO! .
            Guide to the manual
                   We have divided this manual into 9 chapters:
                     Working with LOGO!
                     Installing and wiring the LOGO!
                     Programming LOGO!
                     LOGO! Functions
                     Configuring LOGO!
                     LOGO! Program Modules
                     LOGO! Software
                     Applications
                     Appendices
            LOGO! Manual
            A5E00119092-01
                                                                 i
           Welcome to LOGO!
           Major changes to previous Basic devices (0BA0 to 0BA2)
                       The design of LOGO!Basic versions is improved: all versions
                        are equipped with 8 inputs and 4 outputs.
                       LOGO!Basic is modular: all versions are equipped with an ex-
                        pansion interface.
                       LOGO! is a versatile equipment: there is a series of expansion
                        modules available to you, including, for example, digital mod-
                        ules and an analog module.
           New features of the current Basic devices (0BA3)
                       Password protection for the user program.
                       Program name.
                       Special ’Softkey’ function.
                       New menu item “S/W Time” for automatic summertime/winter-
                        time conversion.
                       Acknowledgment of the message text in RUN mode.
                       Wall mounting is possible.
           Additional support
                     Queries related to your LOGO! can be answered quickly and ea-
                     sily on our website http://www.ad.siemens.de/logo .
           ii                                                      LOGO! Manual
                                                                 A5E00119092-01
                                    Welcome to LOGO!
         Safety guidelines
              The notes in this user manual are for your own personal safety
              and for preventing damage to assets. You should read them care-
              fully and follow the instructions they give you. These instructions
              are highlighted by a warning triangle and are marked as follows
              according to their danger level:
              Danger
          !         Warns that death, serious harm to health or damage to
                    assets will result if the respective precautionary mea-
                    sures are not taken.
              Warning
           !        Warns that death, serious harm to health or damage to
                    can result if the respective precautionary measures
                    are not taken.
              Caution
          !         Warns that harm to health or damage to assets can
                    result if the respective precautionary measures are not
                    taken.
              Note
                    Draws your attention to particularly important informa-
                    tion relating to the product and its handling, or to a part
                    of the documentation requiring your special attention.
              Warning
           !        Only skilled personnel should be allowed to start and
                    operate this device. Qualified personnel in the sense of
                    the information on safety technology in this manual are
                    persons who are authorized to commission, to ground
                    and to tag circuits, equipment and systems in accor-
                    dance with safety regulations and standards.
         LOGO! Manual
         A5E00119092-01
                                              iii
       Welcome to LOGO!
            Warning
        !        This device must always be used as intended for the
                 applications described in the catalog and in the techni-
                 cal specifications, and only in combination with non–
                 Siemens devices or components approved or recom-
                 mended by Siemens .
                 Prerequisite for the safe and correct functioning of the
                 product is its proper transportation, storage, commis-
                 sioning and installation as well as meticulous operation
                 and maintenance.
       Copyright  Siemens AG 1996 to 2001 All rights reserved
       The reproduction, distribution or use of this document or its contents is not permitted without
       express written authority. Offenders will be liable for damages. All rights reserved, in
       particular in the event of patents being granted or the registration of a utility model or design.
       Disclaimer of liability
       We have examined the contents of this publication for agreement with the hardware and
       software described. Nevertheless, discrepancies cannot be ruled out. Any liability and
       warranty for the accuracy of this information is excluded. The data in this manual are
       reviewed at regular intervals. Any corrections required are included in the subsequent
       editions. Suggestions for improvement are welcomed.
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                                      A5E00119092-01