PLC with PIC16F648A Micro Controller - Part 5
Küçük Resim Yok
Tarih
2009
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Timers are an important electronic device, which can be used in a wide range of applications where a time delay function is required based on an input signal. All the 8-bit variables defined for timers must be cleared at the beginning of the PLC operation. The on-delay timer can be used to delay settings an output true (ON - 1) for a fixed period of time after an input signal becomes true (ON -1). The timing function is started as the input signal IN goes true, and, therefore, the elapsed time starts to increase. The ON-delay timer (TON-8) defines 8 on-delay timers selected with numbers ranging from 0-7. The on-delay timer outputs are represented by the status bits TON8-Q.num. The off-delay timer can be used to delay setting an output false (OFF-0) for a fixed period of time after an input signal goes false. The time constant 'tcnst' is an integer constant and is used to define preset time PT, which is obtained by the formula: PT = tcnst × CLK, where CLK should be used as the period of the free-running timing signals.
Açıklama
Anahtar Kelimeler
Phototransistors, Time measurement, Electronic devices, Fixed periods, Input signals, Micro controllers, Time constants, Time delay functions, Timing functions, Timing signals, Delay circuits
Kaynak
Electronics World
WoS Q Değeri
Scopus Q Değeri
N/A
Cilt
115
Sayı
1875
