Hi,
We had a failure on a site that has 10+ of your TMD PLC's. The red pause LED was lit and dispite cycling the power, the PLC the problem remained.
I used the online monitoring function and noticed the following message from the PLC was "PLC program checksum failure, please reload program"
The program has been running for 18 months without a glitch. I reloaded the program and the syatem was back online.
What do you think would cause this error as we have not had this message before?
Cheers