10/29/2020 11:27 AM | |
Joined: 9/27/2006 Last visit: 8/14/2024 Posts: 12277 Rating:
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Hello banconi; The easiest way of provoking a CPU changeover in a S7-400H system is to place the primary CPU in Stop mode, using the mode switch on the front of the CPU module. The stand-by CPU then takes over control of the process; when you xhange first CPU's mode switch back to Run, it links up as the new standby CPU. If you want a solution that does not require playing with the mode switch on the CPUs, I believe that hdhosseini's contribution to this past thread should provide an interesting solution through Step 7. And Satchinpatke's HMI command idea using SFC90 'H_CTRL' in your PLC program could also be interesting, depending on the solution you are looking for. The screenshot below, taken from the System and Standard Functions manual, shows different operations that can be commanded with SFC 90. https://support.industry.siemens.com/cs/ww/en/view/44240604 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 10/29/2020 11:38:36 |
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