Posted 31 May 2016 (edited) Hello everyone. If anyone knows how an empty slot on base is defined by "system monitor" service of GX Works which shown in attached picture? I think this information is read from any CPU register address(Maybe SD or SM and etc. registers). But I don't know exactly which address is deploying an information about empty slot on base. Thanks. Edited 31 May 2016 by chelebi_yn Share this post Link to post Share on other sites
Posted 2 Jun 2016 Not exactly sure what your asking. The rack layout is assigned in the PLC Parameters on the I/O Assignment tab. The number of points occupied by an empty slot is also assigned in the PLC Parameters on the PLC System tab. Share this post Link to post Share on other sites
Posted 3 Jun 2016 We make rack layot in PLC Parameters on the I/O Assignment tab. But i think System Monitor tab read data about base slots from CPU registers not I/O tab ( empty slot number or name of module on used slot). Because if i assign module slot on I/O tab and i take module from base or never put in module on base then I/O tab show there is a module but System Monitor shows the slot is empty. I want to know System monitor how reads information about base slots or which adress of CPU (D, SD, SM) is storing information about slots of base unit. Share this post Link to post Share on other sites
Posted 3 Jun 2016 SD240 - SD246 might have the information you are looking for. Also SD1400 -SD1431 contains the Module Verify Errors Share this post Link to post Share on other sites