Paulo Balbino
Member
Hi everyone,
I am working on a project that needs to expose the SV (Set Value) of a temperature controller to a SCADA system.
SCADA <- (modbus TCP) -> PLC <- (serial/rs485) -> Temperature Controller
Scada needs to be able to read current value and to modify it (write). I was thinking about exposing a single register for both read and write operations (on the PLC so SCADA can access it using Modbus/TCP, then on the ladder logic verify if the value changes, in case it changes perform a write to the Temperature controller. I was reading on some forums that this is not a good practice.
How do you guys address this kind of scenario?
Any opinion or suggestion would be appreciated.
I am working on a project that needs to expose the SV (Set Value) of a temperature controller to a SCADA system.
SCADA <- (modbus TCP) -> PLC <- (serial/rs485) -> Temperature Controller
Scada needs to be able to read current value and to modify it (write). I was thinking about exposing a single register for both read and write operations (on the PLC so SCADA can access it using Modbus/TCP, then on the ladder logic verify if the value changes, in case it changes perform a write to the Temperature controller. I was reading on some forums that this is not a good practice.
How do you guys address this kind of scenario?
Any opinion or suggestion would be appreciated.