Question

The Siemens S7-1200 _________ instruction increases its Count Value(CV) by one each time the Count Up(CU) input is turned on and decreases its CV by one each time the Count Down (CD) input is turned on.

Answer 1

The Siemens S7-1200 instruction described is a Counter instruction, used in PLCs to track events. While traditional counters emitted an audible click and displayed counts on meters, modern PLCs like the S7-1200 reflect these changes in software.

Step-by-step explanation:

The Siemens S7-1200 instruction that satisfies the description provided is known as a Counter instruction. These counters are integral components of Programmable Logic Controllers (PLCs). The counter's main function is to keep track of events based on input signals.

Specifically, with the count up (CU) and count down (CD) inputs, the instruction is capable of increasing or decreasing its Count Value (CV) respectively. Traditional electromechanical counters would often emit an audible click to indicate incrementing or decrementing, and visually display the count on a digital or analog meter. However, in modern PLCs like the Siemens S7-1200, these changes are typically shown via the software interface rather than with an audible sound.