The MicroLogix range covers quite a few models now, from the tiny MicroLogix 1000 to the latest MicroLogix 1400 featuring online programming and ethernet communication for programming and messaging. MicroLogix PLCs are programmed using RSLogix500 programming software.MicroLogix Gotchas.Watch for these limitations of products in the range which catch people out:Only newer models such as MicroLogix 1100 and 1400 offer online programming. For this reason alone, we recommend against buying any of the legacy MicroLogix controllers.Each controller suits only one type of expansion IO – refer to table below for compatibility.The model family number – 1100, 1500 etc is no indication of relative ranking of features. The latest models are the MicroLogix 1100 and MicroLogix1400, which are far superior to the much older MicroLogix 1500 for example.The MicroLogix 1500 requires the purchase of two components – the base and the CPU.The serial port on most MicroLogix controllers is a mini-DIN plug. The MicroLogix 1500 1764-LSP CPU provides a second serial port, but this is a 9 pin D-connector allowing use of a standard cross-over cable for programming.The standard programming cable is a part-number 1761-CBL-PM02, with a DIN plug one end and 9 pin D-Connector the other.For connecting to an HMI, the double DIN plug 1761-CBL-HM02 cable is used.The MicroLogix family has no chassis – the ‘backplane’ for data is conducted through each expansion module. Note the (MicroLogix 1500) 1769 family IO also requires this backplane to be terminated with ‘End Covers’The 1769 IO family has strict rules concerning the number of modules each power supply can accommodate. The rules are based on the maximum number of modules between the power supply and the module in question.Many functions that were built into the PLC and SLC families become optional modules in the MicroLogix family – Real-time clock, backup memory for example.Beware of the various power supply and IO voltage versions. There are various permutations of AC and DC, & extra low and low voltage, ordering details for MicroLogix 1100 and MicroLogix 1400 are available on separate pages.MicroLogix Feature ComparisonMicroLogixFamilyModelNumberBaseIOIO CapabilityIO ExpansionFamilyRelativeRankingEthernetPrg/MSG1OnlineProgrammingRecommended2MicroLogix 100017613232 Points17615Via Net-ENINoNoMicroLogix 11001763184 Modules / 144 Points17622YesYesYesMicroLogix 1200176224 or 406 Modules / 136 Points17623Via Net-ENINoNoMicroLogix 14001766327 Modules / 256 Points17621YesYesYesMicroLogix 1500176424 or 2816 Modules / 512 Points17694Via Net-ENINoNoMicroLogix Feature ComparisonEthernet network programming, messaging and HMI data connection is available, but distributed IO (such as PointIO for example) is not.Recommendation based on project requirements independent of existing or legacy equipment.Is there any information missing here? Send a suggestion to firstname.lastname@example.org and we’ll do out best to include it in the next revision. We promise NOT to correspond with you in any form unless you request. Note that we don’t typically provide technical advice by email.