FOXBORO signal converter E69F-TI2-S

Description

FOXBORO signal converter E69F-TI2-S

If the system design is not done by yourself, then before departure, it is necessary to have sufficient communication with the system designers. For unclear and unclear areas, it is important to clarify them to ensure that you have a clear understanding of the work objectives to be completed and the designer’s intentions. Don’t easily deny the designer’s plan, nor easily say that others’ design is not good.

However, because you are an engineer working on site, there is no need to be too superstitious about designers. You can provide your own suggestions. For example, the principle of matching PLC racks with CPU modules and I/O modules may be that sometimes the designer may not know that the PLC rack you are using has 4 slots, 6 slots, 8 slots, or even 12 slots. Therefore, perhaps all 8 slots have been selected, resulting in several slots being vacant. You can suggest changing it to 4 slots or 6 slots.

In the design of the solution, the most prone area to problems is communication, and the most troublesome part of on-site debugging is also communication. Therefore, for the communication part, you must have a clear understanding of the system’s framework structure, and debug everything that needs communication before departure, and confirm that all modules that need communication can communicate. For example, if a console computer, touch screen, PLC, frequency converter, other PLCs, some intelligent instruments and instruments require communication, you must confirm that they can communicate with each other. If you are not sure, you need to contact the manufacturer and try again in person. If the PLC has a large number of nodes, consider the distance and manufacturer’s CPU limitations.

If the system is large, the limitations on the number of remote units, local racks, and modules per rack are not due to system functionality and technical limitations, but rather due to regulatory limitations. When configuring the system hardware, it is important to consider the combination of these modules.

For the configuration of power modules, a senior engineer should be able to make a reasonable combination. For example, power modules typically have 5A and 10A ratings. If there are fewer modules, low-power power modules can be selected. If there are more modules, high-power power modules should be selected. In general, if the on-site instrument requires the PLC to also supply 24V DC power instead of using external power supply (such as RTU), it is usually reasonable to choose a high-power power supply on the rack where the CPU is located.

A dc milliampere input signal is converted to a proportional pneumatic output signal in the following manner (see Figure 2). A coil positioned in the field of a permanent magnet reacts to the
current by producing a tangential thrust proportional to the input signal flowing through it. The
thrust, acting through coil flexures, varies the gap between a flapper and a nozzle. This causes a
change in the output pressure of the relay, which is also the converter output pressure. This pressure is fed to a feedback bellows which exerts a force on a feedback flexure to move the nozzle and
establish a throttling relationship between the flapper and the nozzle