We have HRSG with its diverter system. HRSG has S7 417H-4HL01-0AB0 V3.1.4 and Diverter has S7 314-6BG03-0AB0 V2.6.11 CPUs. They communicate each other through Plant Bus. PLC to PLC communication between HRSG and Diverter PLCs was fine. Recently we purchased one PLC and one CP for S7 300 system for Diverter (same model and version). To test and check, first we replaced old running and good PLC with the new one (old memory card was used). Everything was fine. All the commands from Central control room HMI to diverter system were working.
But when we tried to replace (diverter S7 300) CP 343-1EX11-1XE0 V2.2 we used new MAC address and put in the SIMATIC Manager (5.3+H.F4) H/W configuration. When we compile H/W configuration editor, it changes MAC address in “netpro” of both PLCs (S7 300 and 400). After downloading, local diverter PLC, local system runs fine but it loses PLC to PLC communication between diverter and HRSG. No command works from remote control room HMIs. I thought that as the MAC address was changed at diverter end, that’s why I downloaded “netpro” to HRSG (S7 400 PLC). But no change was observed.
Note: S7 400H system CP: 443-1EX11-0XE0 V2.4
Note: S7 300 system CP: 343-1EX11-1XE0 V2.2
Again I put original MAC address (commissioning period address) in diverter and HRSG. Downloaded diverter project in Diverter CPU and HRSG project in HRSG CPU but still no change in the communication. Please note that all the command tags and feedback tags (of diverter) in the HMI screen are assigned in HRSG controller getting through the PLC to PLC communication from diverter CPU. At this moment I have no idea to solve the communication problem. I did the same thing back on 2011 but no issue provoked then. Please help me to solve this issue.
But when we tried to replace (diverter S7 300) CP 343-1EX11-1XE0 V2.2 we used new MAC address and put in the SIMATIC Manager (5.3+H.F4) H/W configuration. When we compile H/W configuration editor, it changes MAC address in “netpro” of both PLCs (S7 300 and 400). After downloading, local diverter PLC, local system runs fine but it loses PLC to PLC communication between diverter and HRSG. No command works from remote control room HMIs. I thought that as the MAC address was changed at diverter end, that’s why I downloaded “netpro” to HRSG (S7 400 PLC). But no change was observed.
Note: S7 400H system CP: 443-1EX11-0XE0 V2.4
Note: S7 300 system CP: 343-1EX11-1XE0 V2.2
Again I put original MAC address (commissioning period address) in diverter and HRSG. Downloaded diverter project in Diverter CPU and HRSG project in HRSG CPU but still no change in the communication. Please note that all the command tags and feedback tags (of diverter) in the HMI screen are assigned in HRSG controller getting through the PLC to PLC communication from diverter CPU. At this moment I have no idea to solve the communication problem. I did the same thing back on 2011 but no issue provoked then. Please help me to solve this issue.
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