Automation system is SIEMENS PCS 7 V6.0. CPU 417H- redundant system. SFC showing permanently holding state and nothing can be done on the SFC faceplate just after the reboot of both redundant CPUs. How to resume the SFC to bring the system in operation?
It can be noted that SFC doesn't come in manual mode by using manual selection button of SFC faceplate.
In the External view of the SFC it was found that output signal for holding is showing "1".
Faceplate screenshot is given in the below link: