Eaton ELC-PB - Chapter 1 - ELC Concepts

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Eaton Logic Controller
Programming Manual
Table of Contents
Chapter 1 – ELC Concepts
1.1 ELC Scan Method ................................................................................................................ 1-2
1.2 Current Flow ........................................................................................................................ 1-3
1.3 NO Contact, NC Contact ..................................................................................................... 1-3
1.4 ELC Registers and Relays.................................................................................................. 1-4
1.5 Ladder Logic Symbols........................................................................................................1-5
1.5.1 Creating a ELC Ladder Program.............................................................................. 1-6
1.5.2 LD / LDI (Load NO contact / Load NC contact) ........................................................ 1-7
1.5.3 LDP / LDF (Load Rising edge trigger/ Load Falling edge trigger)............................ 1-7
1.5.4 AND / ANI (Connect NO contact in series / Connect NC contact in series)............. 1-7
1.5.5 ANDP / ANDF (Connect Rising edge in series/ Connect Falling edge in series)..... 1-7
1.5.6 OR / ORI (Connect NO contact in parallel / Connect NC contact in parallel)........... 1-8
1.5.7 ORP / ORF (Connect Rising edge in parallel/ Connect Falling edge in parallel) ..... 1-8
1.5.8 ANB (Connect block in series) ................................................................................. 1-8
1.5.9 ORB (Connect block in parallel) ............................................................................... 1-8
1.5.10 MPS / MRD / MPP (Branch instructions).................................................................. 1-9
1.5.11 STL (Step Ladder Programming) ........................................................................... 1-10
1.5.12 RET (Return) .......................................................................................................... 1-10
1.6 Conversion between Ladder Diagram and Instruction List Mode.................................1-11
1.7 Correcting Ladder Diagram.............................................................................................. 1-14
1.8 Basic Program Design Examples .................................................................................... 1-17
Chapter 2 – Programming Concepts
2.1 ELC Memory Map for ELC-PB/ELCB-PB controllers ....................................................... 2-2
2.2 ELC Memory Map for ELC-PC/PA/PH controllers............................................................. 2-4