SMC Networks EX500 - Manual (Page 22)

EX500 Serial System EX## - OME0008
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5. How to operate EX500 - GDN1 ( DeviceNet )
5 -1. Connection style
DeviceNet unit can be connected by T branch, Multi branch and Branch line branch.
Total extension length of trunk and stay is different depending on communication speed and thickness of
communication cable.
EX500 series can be connected only by T branch.
・ ・・ ・ Wiring length
Communication speed ( k bit / sec. )
125 250 500
Thick cable 500m or less 250m or less 100m or less Max. length
of
Network
Thin cable 100m or less
156m or less 78m or less 39m or less
Total length of branch line
Note : Max. length of a branch line is up to 6m.
Terminating resistance 121 ohms, 1/2W ( TURCK p / n = RSM57TR2 )
・ ・・ ・ Cable specification
Thick cable Thin cable
Item
Signal Power Signal Power
Conductor
section area
0.82mm 2 1.65mm 2 0.20mm 2 0.33mm 2
Color
Blue ( CAN-L )
White ( CAN-H )
Red ( 24VDC ),
Black ( 0VDC )
Blue, White Red, Black
Impedance 120 ohms±10% - 120 ohms±10% -
Propagation
delay
( Maximum )
1.36ns / ft - 1.36ns / ft -
500kHz : 0.25dB / ｆｔ 500kHz : 0.50dB / ｆｔ
125kHz : 0.13dB / ｆｔ 125kHz : 0.29dB / ｆｔ
Attenuation
rate
( Maximum ) 1.00MHz : 0.40dB / ｆｔ
-
1.00MHz : 0.70dB / ｆｔ
-
Conductor
resistance
( Maximum )
6.9 ohms / 1000ft 3.6 ohms / 1000ft 28 ohms / 1000ft 17.5 ohms / 1000ft
1ft ≒ 0.3048m
Terminating resistance
Multi branch
Branch line
T branch Main
Branch line branch
Max. 6m
Node Node
Node
Branch line
Branch line
Node Node
Node
Node
Node
Node
Terminating resistance
Multi
branch
Multi branch