In Fig. 2-21, the push buttons are maintained; one contact is open and one contact is closed. This operator can have a maximum of two Normally Open and two Normally Closed. Typical use is Start-Stop sta- tion. For detailed speciļ¬cations, see Allen Bradley at www.ab.com. Shown in Fig. 2-21a: Line 1 Normally Open Start button […]
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