1. Overview of High-Speed Counters The S7-200 SMART PLC integrates hardware high-speed counters that operate independently of the CPU scan cycle. The standard CPU (firmware version V2.3+) supports 6 channels of high-speed counters, while the compact CPU supports 4 channels. The C-type CPU has a maximum counting frequency of 100kHz, and the S-type CPU reaches … Read more
The role of encoders is something that everyone often hears about, but many people may only have a vague understanding of how to use them. Today, Teacher Chen will share with you the specific usage methods. Before using encoders, we need to first learn about the concept of high-speed counters. 1. What is a high-speed … Read more
1. Why should the S7-200 PLC use the PC/PPI interface? The S7-200 CPU uses RS485, while the COM port of the PC uses RS232. The electrical specifications of the two are not compatible, requiring an intermediate circuit for matching. The PC/PPI is essentially an RS485/RS232 matching cable. 2. What are the advantages of transistor output … Read more
The S7-1200 CPU provides up to 6 (1214C) high-speed counters, which count independently of the CPU’s scan cycle. The measurable single-phase pulse frequency is up to 100KHz, and for quadrature or A/B phase, it is up to 30KHz. In addition to counting, it can also be used for frequency measurement. The high-speed counter can be … Read more
“PLC High-Speed Counters: The Black Technology That Makes Equipment’s ‘Heartbeat’ Accurate to 0.1%!” 1️⃣ Single-phase Counter: The ‘Lone Ranger’ Expertise: A single signal line can handle simple counting scenarios. Pitfall: Weak anti-interference ability, prone to ‘going crazy’ under electromagnetic interference. 2️⃣ Dual-phase Counter: The ‘Dual Swordsman’ Expertise: Two signal lines distinguish forward and reverse rotation, … Read more