I: 4/0 means that it uses Slot 4 (the 5th slot in the rack). An address that describes an input on an SLC 500 is I:4/0. HARDWIRED INPUT вЂ“ a physical connection to the PLC from an input device (switch or sensor, etc.).ДЄllen-Bradley uses the capital letter вЂњIвЂќ to designate a hardwired input. The first rung in a ladder program is always 0000. Just like in an electrical ladder diagram, a rung has some type of output that is turned on or turned off by the preceding entities in the rung. RUNG вЂ“ A section of the PLC ladder program that terminates in an output function of some type. O:0/ 5 means that it is the fifth output on the PLC.Д«y the way, donвЂ™t get the capital вЂњOвЂќ confused with a zero. O: 0/5 means that it uses Slot 0 (in the case of the 1100, this output is onboard) O:0/5 means that it is a physical output. The default is:ДЇor example, an address that references an output of a MicroLogix 1100 is O:0/0. In RSLogix, there are a couple of ways to show the address of a bit. It can be an input, output or internal coil, among others. A few of the most common instructions are described below.Д«IT вЂ“ an address within the PLC. An XIC (it looks like a normally open contact вЂ“] [вЂ“ ) is an instruction. INSTRUCTION вЂ“ RSLogixвЂ™s command language is comprised of вЂњinstructionsвЂќ. LetвЂ™s take a quick look at how memory locations (including hardware I/O) are accessed with RSLogix 500. There are a number of addressing schemes used by PLC manufacturers.

Honeywell plc addressing input output