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I have a pseudo redundant system with PLC´s SIEMENS 545 using two Peer Links modules, the secondary PLC´s in when the primary is cut off but the primary plc data is not copy in the secondary PLC. The redundance in the 505 is made in the PLC program. Any body know this redundant routine or have any paper or information of redundant programming routine for PLC 505 series. I know that can use redundant modules but can not change the original hardware configuration in the system. Thanks in Advance, Eng. Jairo Rodríguez