Hi,

We have a redundant Modicon 424-2 system with dual redundant NOE 771-00 cards in each rack. We are using three master to communicate with the PLC.

- Experion scada channel that reads and write data from the PLC

- Experion C300 peer to peer data interface that collects data from PLC

- Experion SIOP interface that links older controller C200 via modbus rtu <> modbus TCP/IP converter (lantronix).

We have recently commissioned the C300 interface and since then we are having comms drop out on the scada and C300 master channel.

It seems that we are loading the system is there is solution beside pulling the pin on one of our masters.

Is there a way to identify how loaded the system is and where the load is coming from.

Any advise will be greatly appreciated.

 

>- Experion scada channel that reads and write data from the PLC

THIS IS GUESS, IS THE QUICKBUILDER CHANNEL YOU ARE TALKING ABOUT. REQUEST A PAGE IN THE STATION AND ENTER 10. THE PAGE NO. 10 SHOWS DIAGNOSTICS OF ALL THE CHANNELS IN ALL MANNERS. THIS WILL HELP.

>- Experion C300 peer to peer data interface that collects data from PLC

I HOPE YOU ARE USING PCDI BLOCK TO COLLECT DATA FROM PLC TO C300.

IF YES, THEN YOU CAN CHECK THE STATUS OF COMMUNICATIONS OF PCDI IN THE MONITORING SIDE IN CONTROL BUILDER. FRAME AND PACKET LEVEL DIAGNOSTICS ARE AVAILABLE

>- Experion SIOP interface that links older controller C200 via modbus rtu <> modbus TCP/IP converter (lantronix).

THE DIAGNOSTICS ON PAGE 10 IN STATION AND PCDI STATUS MONITORING IN CONTROL BUILDER SHOULD HELP YOU IDENTIFY THE PROBLEM.

IF YOU ARE USING A TERMINAL SERVER (LANTRONIX/SYSTECH) FOR TCP-RTU-TCP CONVERSION, PLZ CHECK ITS CONFIGURATION.

TRY DECREASING THE SCAN RATE OF PCDI AND THE SCADA CHANNEL. YOU ARE POLLING THE SAME DEVICE WITH 3 DIFFERENT MASTERS AND CLASHES BETWEEN THEM COULD CAUSE COMMS DROP OUT.

BEST OF LUCK