Re: NOC 321 IO Scanning

Rene_Roozee

Hello Richard, You can use READ_VAR and WRITE_VAR functions to communicate to other subnets through a router/IP forwarding. If you like to use IO-scanner for this purpose, the BMENOC0301/311 modules support IP addresses on a different subnet. Minimum version of BMENOC firmware should be 2.05 (latest =2.16).

Rene_Roozee

Hello, The advantages of using IO scanner are: 1: Ease of use: configure (IOscanner) instead of programming (READ_VAR) 2: Faster read action/read response: Read_var takes several CPU scans to complete, while IOscan, can complete within a CPU scan (depending on refresh rate, CPU scan and responsiveness of device). 3: Number of concurrent IOscanner read/write actions higher than number of concurrent READ_VAR's. READ_VAR has a few advantages: 1: Possibility to READ %I, %IW and %M (Ioscanner limited to %MW only). 2: Possibility to change to communication function on-line, while IO scanner is changed offline and offline build/stop CPU/transfer has to be performed. br Rene Roozee

Rene_Roozee · ‎2019-04-26

Probably a bit confusing terminolgy used from my side, but the real-time database is RAM memory of the SCADA system, not a SQL like database. Best to compare this as application cache memory. So, when the SCADA system is switched off, the real-time data is lost. The Real-Time data consist or variables/TAGs filled by data coming from the connected PLCs/RTUs. These TAGs can be used to visualize, detct alarm levels and LOG to a historical database. The historical database (historian) is a file or database on a harddisk/fileserver.

Rene_Roozee · ‎2019-04-25

No, EcoStruxure Machine SCADA Expert and EcoStruxure Geo SCADA Expert are different solutions. EcoStruxure Machine SCADA Expert has a focus on stand-alone scada applications, connected direct to control systems on a machine. Maximum amount of variables/TAGS is 64K. EcoStruxure Geo SCADA Expert has a focus on RTU/telemetry applications, with a distributed architecture (client/server), server redundancy connecting lot's of CPU's. Virtually no limitation on amount of TAGs/variables. You can find detailed information on the respective links.

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