Festo SBO*-M-* Series, Electronic Manual

Page: 54 / 84

4 . Commissio n i ng
4− 6
F es t o P .B E−S BO −M−EN e n 0511 N H
N e tw o rk mas k Wh ic h nu m b e r s i n a n IP a ddr ess n o w r e pr ese nt th e n e tw o rk
ID a nd th e h os t ID a r e d e f i n e d by th e s p eci f ica t io n o f a
so − calle d n e tw o rk mas k" .
Th e t ele ph o n e nu m b e r o f F es t o G e r ma ny ca n b e u se d as a n
e x am p le t o e xp lai n th e IP a ddr ess a nd th e n e tw o rk mas k:
00 4 9 7 113 47 0
Wh ic h o f th ese nu m b e r s r e pr ese nt s th e d ialli ng co d e a nd
wh ic h r e pr ese nt s th e s ub sc r i b e r nu m b e r b ecomes clea r wh e n
y o u also kn o w: th a t th e f i r s t 7 f i gur es r e pr ese nt th e d ialli ng
co d e , th e las t 4 r e pr ese nt th e s ub sc r i b e r nu m b e r" . Th a t is th e
n e tw o rk mas k" f o r th e t ele ph o n e nu m b e r a b o v e.
N e tw o rk classes Th e n e tw o rk mas k f o r IP a ddr esses d e f i n es w i th 0 " as a
p osi t io n ma rk e r, th e byt es wh ic h a r e u se d f o r a ddr essi ng th e
s t a t io n (h os t ID) . N e tw o rk s b elo ng t o d i ff e r e nt n e tw o rk
classes d e p e nd i ng o n th e nu m b e r o f th ese byt es :
Network
class Network
mask Explanation
A 255.0.0.0 L a rg e n e tw o rk
B 255.255.0.0 M e d i u m n e tw o rk
C 255.255.255.0 S mall n e tw o rk
w i th ma x . 25 4 s t a t io n s
T a b . 4/ 1 : Th e mos t im p o rt a nt n e tw o rk classes w i th th e
a ppr o pr ia t e n e tw o rk mas k s ( e x am p le )
G a t e w a y N e tw o rk s w i th d i ff e r e nt N e tw o rk−ID s a r e co nn ec t e d t o eac h
o th e r v ia a r o ut e r o r g a t e w a y . If a s t a t io n i n a n e tw o rk is t o
se nd d a t a t o s t a t io n s i n o th e r n e tw o rk s , th e IP a ddr ess o f
th e g a t e w a y m u s t b e s p eci f ie d .