Black, Uyless D. <br/><br/>
Programmable logic controllers 
Frank D Petruzella 
 - Upper Saddle River, N.J.  Prentice Hall PTR  c2000. 
 - xxi, 328 p.  ill.  25 cm. 
<br/><br/>Includes bibliographical references (p. 317-319) and index. 
<br/><br/><label>ISBN: </label>0130224634 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony.<br/>TCP/IP (Computer network protocol)