Advice on synchronizing local and remote settings

[glennz]

I've done this or similar with some graphics intelligence and PLC coding in a pure Rockwell environment (PanelView tocuhscreen and FTView SE SCADA). Maybe it's possible in your environment.

At each location a specific graphic screen is configured for setpoint manipulation. When the touchscreen graphic is opened, bits/bytes are sent from local PLC to remote to let SCADA know it's hands off - opening and/or manipulating its setpoint graphic is blocked. Any newly adjusted values are immediately sent from local PLC to remote (SCADA) PLC.

Vice-versa when the SCADA graphic is opened.

Force each setpoint manipulation graphic closed after a short period of inactivity and clear the 'hands off' bits. Ask/demand the users close the graphics when not using them as a standard operating procedure.

When neither setpoint manipulation graphic is opened you don't need to move any values back or forth. They'll have been updated during the last 'transaction'.

 

[ryangriggs]

The "Hands Off" bit is a novel idea - I had not thought of that, and I like the idea. Thank you for sharing this.

I've done this or similar with some graphics intelligence and PLC coding in a pure Rockwell environment (PanelView tocuhscreen and FTView SE SCADA). Maybe it's possible in your environment.

At each location a specific graphic screen is configured for setpoint manipulation. When the touchscreen graphic is opened, bits/bytes are sent from local PLC to remote to let SCADA know it's hands off - opening and/or manipulating its setpoint graphic is blocked. Any newly adjusted values are immediately sent from local PLC to remote (SCADA) PLC.

Vice-versa when the SCADA graphic is opened.

Force each setpoint manipulation graphic closed after a short period of inactivity and clear the 'hands off' bits. Ask/demand the users close the graphics when not using them as a standard operating procedure.

When neither setpoint manipulation graphic is opened you don't need to move any values back or forth. They'll have been updated during the last 'transaction'.

 

[JeremyM]

Might try having a look at the Pax CmdSrc AOI for another perspective. Devices implementing a CmdSrc input parameter(s) for each of the possible owners. The selected owner setpoint can then be mirrored about the rest of a system.

 

[GaryS]

don't make it complacated
store all you variabled in the plc and access them from whatever hmi you neeed whats important is that every body is accessing the same data