Question

I added analog IO pointer method during online edits. I then wrote to changes to PLC. But my analog IO still does not work, where do I start checking?

Answer

a. Make sure you go to Program Mode, then back to RUN. If you do online edits while in RUN mode, the PLC does not turn on the SP0 bit, so the new code never runs. You can verify by viewing values in system words (V7700, V7701, etc) to see if they hold the expected values. If they do not, they will populate with correct values when you power down and then power up or when you go to Program mode and then back to RUN mode.

---

FAQ Subcategory: Analog

This item was last updated on 2012-06-26
Document ID: 1163

---

The information provided in the AutomationDirect knowledge base is provided "as is" without warranty of any kind. AutomationDirect disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall AutomationDirect or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if AutomationDirect or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion of limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.