Delta DVP-ES2 User Manual download pdf (Page 17)

100

101

1. PLC Concepts

1-9

Branch

instruction

Branch

Symbol

Description

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

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

MRD

MPP

MPS

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

previous step is completed, therefore it forms a sequential control process similar to SFC

(Sequential Function Chart) mode. The STL sequence can be converted into a PLC ladder diagram

which is called “step ladder diagram” as below.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 701 702

Delta DVP-ES2 User Manual Page 17

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