What is the difference between pcs and dcs

While there are differences between a programmable logic controller PLC and a distributed control system DCS , there has also been a move towards greater convergence of the two technologies.

But first, a little history. In the early days of automation, PLCs dominated machine control, that is, applications calling for discrete control of machine processes. Meanwhile, a DCS was the predominant choice for process control in applications such as oil and gas and chemical plants. PLCs still are used to control individual machines, while a DCS can control a larger number of machines or processes within a factory or plant.

The answer, like most things in the world of automation, is that it depends on the needs of your application. Here are six key factors to consider:.

PLCs are fast, no doubt about it. Response times of one-tenth of a second make the PLC an ideal controller for near real-time actions such as a safety shutdown or firing control.

In fact, safety systems require a separate controller. Another problem with PLCs is redundancy. The complex nature of many continuous production processes, such as oil and gas, water treatment and chemical processing, continue to require the advanced process control capabilities of the DCS. Others, such as pulp and paper, are trending toward PLC-based control.

If your process is complex and requires frequent adjustments or must aggregate and analyze a large amount of data, a DCS is. DCS vendors typically require users to employ them to provide integration services and implement process changes. System integrators perform similar functions for PLC-based systems.

It has also become common for PLC vendors to offer support services through their network of system integrator partners. Process control has become increasing complex. Manufacturers also continue to reduce factory staff and a generation of experienced process control personnel has begun to retire. As a result, the quality of support has become a critical factor in vendor selection.

Liked this article? Download the entire playbook here. Here are six key factors to consider: 1. Response time PLCs are fast, no doubt about it. When selecting a flow meter for the production line, you need to know information about the fluid involved, the rate of movement, and how to record the flow. Flow meter types include the following:. A force sensor measures forces and torque exerted.

These sensors usually contain strain gauges and can communicate information required for force measurements. Force sensors can be mechanical, hydraulic, or electrical strain gauges.

A temperature sensor converts the temperature into another quantity such as mechanical movement for a dial or an electric voltage. Actively scan device characteristics for identification.

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