Cascading Timers

A new method is proposed, called “cascading timers”; it solves the logical sequential problem that includes timers on its sequence; in automatic systems, this method solves in an analytical, didactic, systematic, and effective way. Most of the sequential systems of the industry include the time function into their logical sequence. This method can solve from simple problems where a single timer is applied to complex systems that use more timers, from single-loop problems to looping systems, including systems with multiple main lines and with external input signals. This method consists of staggering the timers of a sequential system and keeping the coils of the timers on until one cycle of operation is completed. When solving sequential systems based on the time function by analytical methods, there is the advantage that a reliable and standard solution can be reached without having accumulated years of practical experience. Application limits. The method is based on the timer on delay (TON). It applies to both types of logic, programming logic systems, using the PLC, and wired logic systems, called electromechanical control systems, which use all the devices physically in the equipment using relays. Do not apply to integrated circuits or generic array logic (GALs).