Address SLC I/O modules

The elements (words) in I/O modules are mapped into a memory table. If the Analog I/O modules are being used, then the point naming will differ from the point naming in the programming software. The Communication Driver item name must be computed from the sum total of words used by the previous input or output blocks. The operator can use the programming software Data Monitor to look at the memory map of the I file or O file to verify your address. If the address is unsure, or if the PLC configuration is likely to change, copy the points in question to the N table or B table, and access the data from there.

The naming conventions used in the Allen-Bradley programming software are not supported by the Allen-Bradley Ethernet Direct Communication Driver. The addressing convention is similar to that of the PLC-5 family processors. To derive the correct address for each I/O point, see Diagram system. Also see the following topics, Label I/O modules with word counts," Sequentially number the input modules, and Sequentially number the output modules, to complete addressing the SLC I/O modules.