We have a packing machine with a 1785-L60L Extended Local PLC-5/60L controller with a 1785-ENET attached in the main rack and connected from the processor to I/O in an extension rack via a 1771-ALX.
This processor is out of memory and we are unable to carry out any substantial modifications to the machine operation. Yes we have removed redundant code and reduced data tables as much as possible but are still fairly close to the memory limit.
We tried upgrading the processor to a 1785-L80E Ethernet PLC-5/80E(more memory)we had on a redundant process and connected to I/O in the extension rack via RIO and a 1771-ASB. We found when we carried out test runs on the machine it was missing cycles, it appeared to be running slower.
The program scan times for both (i.e. 5/60L and 5/80E) were identical. I know from the specs. that the 5/60L I/O scan appears to be a lot quicker than the 5/80E. I presume this is why the machine does not function as expected. Any suggestions or help as to how we might resolve this problem would be appreciated. Remember lack of memory was our main driver behind the proposed upgrade.
This processor is out of memory and we are unable to carry out any substantial modifications to the machine operation. Yes we have removed redundant code and reduced data tables as much as possible but are still fairly close to the memory limit.
We tried upgrading the processor to a 1785-L80E Ethernet PLC-5/80E(more memory)we had on a redundant process and connected to I/O in the extension rack via RIO and a 1771-ASB. We found when we carried out test runs on the machine it was missing cycles, it appeared to be running slower.
The program scan times for both (i.e. 5/60L and 5/80E) were identical. I know from the specs. that the 5/60L I/O scan appears to be a lot quicker than the 5/80E. I presume this is why the machine does not function as expected. Any suggestions or help as to how we might resolve this problem would be appreciated. Remember lack of memory was our main driver behind the proposed upgrade.