In more recent years,[when?] small products called programmable logic relays (PLRs) or smart relays, have become more common and accepted. These are similar to PLCs and are used in light industries where only a few points of I/O are needed, and low cost is desired. These small devices are typically made in a common physical size and shape by several manufacturers and branded by the makers of larger PLCs to fill out their low-end product range. Most of these have 8 to 12 discrete inputs, 4 to 8 discrete outputs, and up to 2 analog inputs. Most such devices include a tiny postage-stamp-sized LCD screen for viewing simplified ladder logic (only a very small portion of the program being visible at a given time) and status of I/O points, and typically these screens are accompanied by a 4-way rocker push-button plus four more separate push-buttons, similar to the key buttons on a VCR remote control, and used to navigate and edit the logic. Most have a small plug for connecting via RS-232 or RS-485 to a personal computer so that programmers can use simple applications in general-purpose OS like MS Windows, macOS or Linux, that have user-friendly (G)UIs, for programming instead of being forced to use the tiny LCD and push-button set for this purpose. Unlike regular PLCs that are usually modular and greatly expandable, the PLRs are usually not modular or expandable, but their price can be two orders of magnitude less than a PLC, and they still offer robust design and deterministic execution of the logic.
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Programmable logic controllers : principles and applications. By John W Webb Ronald A.A programmable logic controller PLC is a special-purpose computer. Manufacturing plant may also be controlled through a single master PLC. Eckman, D.P, Industrial Instrumentation, John WileySons, New York, 1980. Webb, J.W. and Reis, R.A, Programmable Logic Controllers, Prentice Hall, Upper Saddle.with respect to relay logic,
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53. The transformation of social relationships that responds to the demands of the Kingdom of God is not fixed within concrete boundaries once and for all. Rather, it is a task entrusted to the Christian community, which is to develop it and carry it out through reflection and practices inspired by the Gospel. It is the same Spirit of the Lord, leading the people of God while simultaneously permeating the universe[63], who from time to time inspires new and appropriate ways for humanity to exercise its creative responsibility[64]. This inspiration is given to the community of Christians who are a part of the world and of history, and who are therefore open to dialogue with all people of good will in the common quest for the seeds of truth and freedom sown in the vast field of humanity[65]. The dynamics of this renewal must be firmly anchored in the unchangeable principles of the natural law, inscribed by God the Creator in each of his creatures (cf. Rom 2:14-15), and bathed in eschatological light through Jesus Christ.
348. The free market cannot be judged apart from the ends that it seeks to accomplish and from the values that it transmits on a societal level. Indeed, the market cannot find in itself the principles for its legitimization; it belongs to the consciences of individuals and to public responsibility to establish a just relationship between means and ends.[728] The individual profit of an economic enterprise, although legitimate, must never become the sole objective. Together with this objective there is another, equally fundamental but of a higher order: social usefulness, which must be brought about not in contrast to but in keeping with the logic of the market. When the free market carries out the important functions mentioned above it becomes a service to the common good and to integral human development. The inversion of the relationship between means and ends, however, can make it degenerate into an inhuman and alienating institution, with uncontrollable repercussions. 2ff7e9595c
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