Why create the PAC (Programmable Automation Controller)?

Most industrial automation system users have heard of new generation controllers like Hybrid & PAC since early 2000, but how many of them know why a new control system was required? We already have the PLC (Programmable Logic Controller) and DCS (Distributed Control System), and certainly they are both powerful enough to meet existing requirements. Although each type of controller works well and is upgraded with additional hardware & software continuously, we needed more enhanced features. The most efficient method was to modify the existing model, as there was not a critical reason to design a totally new control system yet. It has been said that because the PAC is a PC-based control system, it is the current technical trend for the foreseeable future, but another powerful PC-based control system, the DCS, already existed, and is popular in the market now....so the compelling question becomes, "Why did we need the PAC?".. ...read more.

PWM - Pulse Width Modulation

Pulse Width Modulation (PWM) technology is widely used for industrial applications such as measurement, motor control, power control and more. It offers a simple way for digital control logic to create an analog equivalence. By using Advantech¡¦s high-resolution counter cards, the duty cycle of a square wave can be modulated to encode specific analog signal levels so they can be used to control many electronic devices......read more.