CS1D Duplex System PLC Manual

This document describes Omron's CS1D Duplex System, a programmable logic controller (PLC) designed for high-reliability, redundant systems requiring 24/7/365 operation. It highlights the system's support for IEC 61131-3 programming languages (ST and SFC), function blocks (FBs) for improved development productivity, and high-capacity memory (400K steps, 832K words) for structured and modular programming.