SCADA monitors — and where needed controls — many machines from a single screen. Its job is to show you what is happening right now.
Field states and measurements
Live screens, alarms and history
Review conditions and control decisions
SCADA monitors — and where needed controls — many machines from a single screen. Its job is to show you what is happening right now.
SCADA reads values from controllers such as PLCs, displays them, raises alarms, and lets an operator change setpoints. It matured first in continuous industries like power, water and chemicals, and is now common in discrete manufacturing too.
SCADA is concerned with current state: what temperature, which machine stopped. MES is concerned with how this work order was executed — a history. They look at different things.
In many plants SCADA already exists but its data stays inside it. You can watch it on screen, yet it is never grouped by lot or joined to inspection results, so it never reaches root-cause analysis.
They serve different axes. SCADA organises data by equipment; MES organises it by order and lot. "What temperature is machine 3 right now" is a SCADA question. "What conditions produced this lot and who worked on it" is an MES question. In practice MES often consumes SCADA data and attaches it to the lot.
Terms that make more sense read together.
A PLC is the industrial controller that actually runs a machine. It reads sensor inputs, app…
SystemsA Manufacturing Execution System (MES) records and manages how a work order is actually carr…
Equipment & ProtocolsAn edge gateway sits close to the equipment, collects data across incompatible protocols, no…
Equipment & ProtocolsOPC UA is an industrial communication standard that carries names, units and structure along…
What IYULAB provides in this area.
Questions that come up when evaluating SCADA.
Usually yes. If SCADA exposes a database or an OPC interface, read from there; if not, reading the PLC directly is the alternative.
An HMI is typically the operator panel attached to one machine. SCADA supervises many machines as a higher-level system. Think of it as a difference of scale and scope.
No. If collection is the only goal, reading PLCs through an edge gateway is simpler and cheaper.
A look at your equipment and current workflow is usually enough to scope it.
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