We had a situation arise the other day where certain data (pid setpoints etc) which are stored in an Seimens S7 Databalock were somehow set to zero. At this stage the only thing thjat occured was that one of the on-site electricians "re-booted" the PLC. My questions are..
1. Is it normal for data stored in a datablock to be cleared when either a cold or a warm reboot is preformed on the CPU ?
2. If so how do you guys overcome the issue of losing your setpoints etc. when the CPU is rebooted ?
3. If not what could cause the databalocks to be zero'ed ?
1. Is it normal for data stored in a datablock to be cleared when either a cold or a warm reboot is preformed on the CPU ?
2. If so how do you guys overcome the issue of losing your setpoints etc. when the CPU is rebooted ?
3. If not what could cause the databalocks to be zero'ed ?