A12 panel running iX: modbus RTU communication drop outs

[kkwon2]

Hi,
We are using an A12 panel with iX run-time. The A12 is a Modbus-rtu slave responding to requests from a Single Board Computer, the Modbus-rtu master, via RS-232 at 115200 baud. The master is issuing 2 requests periodically at a rate of 15 Hz.
We are observing after a long interval, for example 12 hours, a momentary loss of communications (A12 response is timing out) that may last for about 20 seconds. We have monitored the A12 CPU use and it is approximately 59% but can observe periodic peaks of about 82%. The A12 memory use is approx.52%.
The A12 tag update are all allocated to poll group 1 (500ms).
Any ideas on what may be causing the timeouts?

Regards,
Ken

[Jae V]

Hello,
We understand that this is a very old post. We would need to do probably get the project on a test bench here where we could monitor it and see if we can't find something that stands out. If there is anyone who is still experiencing this or similar issues and require assistance, please visit us at https://www.beijerelectronics.us/en-US/ ... ___support or give us call at 801.708.6690. Thank you.