we have several PLC’s in error where the PLCs have fallen without power and possibly on start-up again without power. (Status indicator D remains on orange).
(a) Could this be critical or is a recovery possible?
(b) How can we protect the PLCs from such situatuation as they are built into new construction projects where work in progress after start-up of the building causes these voltage drops
a) After several unsuccessful attempts to startup, plc switches it’s internal bind to active sd card partition. It can cause fail of project startup, in case if FW of this partitions not equal to project version.
“If the boot process failed several consecutive times, the inactive and the active boot partition will change their roles, too. This behavior has been implemented to keep the PLCnext Control device accessible even if the firmware update fails. The behavior can also occur when the boot process is interrupted e.g. by power loss. In this case you will observe that the controller boots with its previously installed firmware version. To prevent such unintended firmware downgrades, Phoenix Contact recommends that after a successful firmware update, the same firmware should be installed once again. This way both the active and the inactive boot partition contain the same firmware version.”
https://www.plcnext-runtime.com/ch02-05-disk-partitions.html
b) use ups power supply or etc..Sync FW for both partitions.
Best regards
a) After several unsuccessful attempts to startup, plc switches it’s internal bind to active sd card partition. It can cause fail of project startup, in case if FW of this partitions not equal to project version.</p>“If the boot process failed several consecutive times, the inactive and the active boot partition will change their roles, too. This behavior has been implemented to keep the PLCnext Control device accessible even if the firmware update fails. The behavior can also occur when the boot process is interrupted e.g. by power loss. In this case you will observe that the controller boots with its previously installed firmware version. **To prevent such unintended firmware downgrades, Phoenix Contact recommends that after a successful firmware update, the same firmware should be installed once again. </strong> This way both the active and the inactive boot partition contain the same firmware version.”</p>[https://www.plcnext-runtime.com/ch02-05-disk-partitions.html</a></p>b) use ups power supply or etc..Sync FW for both partitions.</p>Best regards</p>
Thank’s Olek!