1. PLC Concepts 1.5.9 ORB (Connect block in parallel) ORB instruction connects a block in parallel with another block ORB instruction 1.5.10 MPS / MRD / MPP (Branch instructions) These instructions provide a method to create multiplexed output branches based on current result stored by MPS instruction. Note: When compiling ladder diagram with WPLSoft, MPS, MRD and MPP could be automatically added to the compiled results in instruction format. However, sometimes the branch instructions are ignored by WPLSoft if not necessary. Users programming in instruction format can enter branch instructions as required. Connection points of MPS, MRD and MPP: MPS MPS MRD MPP MPP Note:
Ladder diagram editor in ISPSoft does not support MPS, MRD and MPP instructions. To achieve the same results as branch instructions, users have to connect all branches to the left hand bus bar. WPLSoft ISPSoft 1.5.11 STL (Step Ladder Programming) STL programming uses step points, e.g. S0 S21, S22, which allow users to program in a clearer and understandable way as drawing a flow chart. The program will proceed to next step only if the 1-7 Branch Branch Description instruction Symbol MPS ┬ Start of branches. Stores current result of program evaluation. Max. 8 MPS-MPP pairs can be applied MRD ├ Reads the stored current result from previous MPS MPP └ End of branches.
Pops (reads then resets) the stored result in previous MPS