shanefaulkner
Member
Today I was making an online edit to a 5/40 Series E Rev K.2 with about 14% free memory. I was removing one branch in a large rung. Accept edits, test edits worked fine. I went to assemble edits, and got an error message "Assemble edits failed" and... something happened to the PLC. Logix5 got disconnected and the PLC stopped working.
The PROC light was alternating between red and green. The documentation says this indicates "Processor FLASH memory checksum error - contact your local A-B rep for a field firmware update".
I tried to wipe its program, removed battery then powered back up. Tried switching key from PROG back to REM. It still is alternating red and green and I cannot get back online.
Has anyone ever seen such behavior? I know you can run into problems when editing a large rung with very little free memory (not sure what this can cause, I just know to try to avoid it), but I thought 14% free would be more than enough. Luckily the plant had a shelf spare (a larger 5/60). I just can't fathom how editing a rung would brick a processor like this.
The PROC light was alternating between red and green. The documentation says this indicates "Processor FLASH memory checksum error - contact your local A-B rep for a field firmware update".
I tried to wipe its program, removed battery then powered back up. Tried switching key from PROG back to REM. It still is alternating red and green and I cannot get back online.
Has anyone ever seen such behavior? I know you can run into problems when editing a large rung with very little free memory (not sure what this can cause, I just know to try to avoid it), but I thought 14% free would be more than enough. Luckily the plant had a shelf spare (a larger 5/60). I just can't fathom how editing a rung would brick a processor like this.