IDP10-AF1C01F FOXBORO pressure transmitter

Description

In industrial automation control, alarm display is very important and is often used in many situations. Alarm lists are the simplest and most intuitive alarm method.

Each project in the A-series text editing software can set a set of alarm list information. An alarm message corresponds to an intermediate relay, and the definition number of the intermediate relay is continuous. The initial address of the intermediate relay can be set by the user according to the actual user program. When any intermediate relay jumps from OFF to ON, it indicates that the corresponding alarm is generated. The text integrated machine display interface of the A series will automatically pop up an alarm display screen and display the alarm information in the first line. When the other intermediate relay is ON, a new alarm message is displayed from the second line. On the contrary, when a certain alarm intermediate relay becomes OFF, the corresponding alarm message automatically disappears.

Given the increasing importance of factory, industrial, and manufacturing automation, we have finally found the opportunity to dismantle a popular PLC Allen Bradley Micro850 and explore some of the choices made in its design, hoping to clarify its core I/O isolation options and some of the unit components used in this well-known PLC design.

PLC has a long history, and Allen Bradley himself coined the term “programmable logic controller” as early as the introduction of the term “programmable logic controller” in 1971. Later, Allen Bradley was acquired by Rockwell Automation. The term PLC was quickly fixed, especially when the abbreviation PC appeared and was adopted. (For more background on the origin and evolution of PLC, please refer to Segovin and Theorin’s “History of PLC and DCS Development”.)

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