I am developing an application using LK4.5 communicating to Quantum PLC over Ethernet Modbus. The update is set at 1 sec. There is a periodic delay in getting an response from the PLC. On probing, i have found that the Modbus object update (checked with an led) blinks OK for about 20-30 seconds during which the valid frames are incrementing correctly. However, after that, for a short duration of about 10 secs, the update led stops, and the valid frame count increases quite rapidly. During this time, the date is not being read from the PLC. This process repeats quite regularly. This time during which it reads correctly, and when it gives a problem, remains quite constant for one PLC, though it varie
s between PLC to PLC. There are 7 PLC's connected to the system. Please suggest any remedial action. Thanks.
