Webb, John W. <br/><br/>
Programmable logic controllers :  principles and applications / 
John W. Webb. 
 - 2nd ed. 
 - New York :  Merrill,  1992. 
 - 378 p. :  ill. ;  25 cm. 
<br/><br/> Rev. ed. of: Programmable controllers, 1988. 
<br/><br/><label>ISBN: </label>002424970X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Programmable controllers.