Turck DeviceNet Service Manual

DeviceNet™

Troubleshooting

FIELD GUIDE

G1001
Publised 11/11/2013

SCOPE

he purpose of this troubleshooting guide is to direct qualied service personnel to the causes of network problems
and provide remedies. The primary goal of troubleshooting is to minimize network downtime. Test procedures

T

resistance of the physical media layer. It is usually sucient to have a true RSM multimeter, such as Fluke ® 87-3 Digital
Multimeter or similar to run tests and obtain reliable measurements. For information on designing DeviceNet™ systems,
refer to ODVA publication 27: “DeviceNet Planning and Installation Manual”.

1.1 Network Components

DeviceNet uses a trunk line and drop line topology to connect nodes for communication. Here is an example:.

described in this Troubleshooting Guide require the use of test equipment to measure voltage, current, and

Trunk Line

TR

TR = Terminating Resistor

Component Description

Trunk Line The network cable between terminators. It is usually a

Drop Line The network cable between the trunk and nodes. Each

Tap A branching point from the trunk line. There may be one

Terminating Resistor The 121 Ohm resistor that is connected to the end of the

Node An addressable device that communicates on the

Power Supply The 24-volt DC source that powers network

NODE NODE

NODE

Drop Line

TapT ap

NODE NODE

Trunk Line

TR

POWER
SUPPLY

“thick” cable.

drop line may be no longer than 6 meters (20 feet)

node on a drop line, as with a tee tap, or multiple drop
lines, as with a multiport junction box.

Trunk Line. There are two terminators per network.

network. There may be as many as 64 nodes per network.

communication. There may be multiple power supplies
on a network, located anywhere on the network.

Drop Line

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Wiring and Connector Pin Denitions

There are ve conductors in DeviceNet™ cables. There are three connector types commonly used on DeviceNet systems:
7/8 16 minifast ® (mini), M12 eurofast ® (micro), and screw terminal (open). Table I shows the connector pin denitions
and Table II shows the connector styles.

Name Wire Color Description

Shield Drain Bare Connection to the shields in the cable

V+ Red Connection to the bus 24 VDC supply

V- Black Connection to the bus supply common (0 VDC)

CANH Blue Data connection (high dierential)

CANL White Data connection (low dierential)

DeviceNet™ Cable Classication

Table I: Pin Denitions

Male mini

Connector

1 = Bare (Drain)
2 = Red (V+)
3 = Black (V-)
4 = White (CANH)
5 = Blue (CANL)

Table II: Connector Styles

Male Connectors

Female mini

Connector

minifast (mini) eurofast (micro) Open Style Front View

Male micro

Connector

1 = Bare (Drain)
2 = Red (V+)
3 = Black (V-)
4 = White (CANH)
5 = Blue (CANL)

Female micro

Connector

Open Female Connector

Rear View

5 = Red (V+)
4 = White (CANH)
3 = Bare (Drain)
2 = Blue (CANL)
1 = Black (V-)

Female Connectors

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DeviceNet™ cables are classied according to DeviceNet Specication1 as:

Round Cables

• Thick Cable or Cable II

• Thin Cable or Cable I

Flat Cables

Table III: Cable Specications (provides data for each cable type listed in the DeviceNet Specication)

Data Pair Thick Cable Cable II Thin Cable Cable I Flat Cable

Min. Conductor Size:

#18 #18 #24 #24 #16

19 strands min.

Insulation Diameternominal 0.150 in 0.150 in 0.077 in 0.077 in 0.110 in

Color CAN_H White

CAN_L Light Blue

Impedance 120 Ohm +/- 10% @ MHz

Max. Propagation Delay 1.36 nSec/ft 1.36 nSec/ft 1.36 nSec/ft 1.36 nSec/ft 1.60 nSec/ft

DCR - at 20 degrees C (max) 6.9 Ohms

/1000 ft

Tape Shield 2 mil/1 mil,

Al/Mylar

6.9 Ohms
/1000 ft

1 mil/1 mil,

Al/Mylar

6.9 Ohms
/1000 ft

2 mil/1 mil,

Al/Mylar

28 Ohms

/1000 ft

1 mil/1 mil,

Al/Mylar

4.9 Ohms
/1000 ft

N/A

Power Pair

Min. Conductor Size #15 #15 #22 #22 #160

Insulation Diameternominal 0.098 in 0.098 in 0.055 in 0.055 in 0.110 in

Color V+ Red

V- Black

DCR - at 20 degrees C 3.6 Ohms

/1000 ft

Tape Shield 1 mil/1 mil,

Al/Mylar

3.6 Ohms
/1000 ft

1 mil/1 mil,

Al/Mylar

17.5 Ohms
/1000 ft

1 mil/1 mil,

Al/Mylar

17.5 Ohms
/1000 ft

1 mil/1 mil,

Al/Mylar

4.9 Ohms
/1000 ft

N/A

General Specications

Outside Diameter 0.410 - 0.490” Specied by

Vendor

Bent Radius (d = diameter) 7 x d, xed

20 x d, ex

Suitable for
Application

0.240 - 0.280” Specied by
Vendor

7 x d, xed
20 x d, ex

Suitable for
Application

N/A

10 x

diameter

Drain Wire #18 #18 #22 #22 N/A

Agency Certication NEC (UL)

CL2/CL3 min.

Overall Shield Braid

36 AWG or

0.12 mm Cu

Compliant

w/ local gov’t

regulations

Braid

36 AWG or

0.12 mm Cu

NEC (UL)

CL2/CL3 min.

Tape

1 mil/1 mil,

Al/Mylar

Compliant

w/ local gov’t

regulations

Tape

1 mil/1 mil,

Al/Mylar

NEC (UL)
CL2 min.

N/A

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Thick Cable and Cable II

The maximum cable length used in trunk-drop topology depends on the data rate:

Table IV: Thick Cable and Cable II Topology

Communication Rate Network Length Trunk Length Maximum Drop Cumulative Drop

125 kb 500 m (1640ft) 500 m (1640 ft) 6 m (20ft) 156 m (512 ft)

250 kb 250 m (820 ft) 250 m (820 ft) 6 m (20 ft) 78 m (256 ft)

500 kb 100 m (328 ft) 100 m (328 ft) 6 m (20 ft) 39 m (128 ft)

The length of the network is the sum of the trunk length and cumulative drop length.

Thick Cable Capacity

The power distribution chart, Figure 1, shows the maximum allowed current through the power conductors of the thick
cable. Distance is measured from a single 24 VDC power source. If the maximum current exceeds the specied value
at any given point on the network, the power supply systems should be re-designed. Figure 1 provides thick cable
current ratings.

Figure 1: Current available through power conductors of thick cable

Maximum Current Capability (amps)

8.00

8

7

6

5

4

3

2

1

0

0

5.42

2.93

2.01

1.53

50 100 150 200 250 300 350 400 450 500

(164) (328) (492) (656) (820) (1984) (1148) (1312) (1476) (1640)

Length of Network in meters (feet)

1.23

1.03

0.89 0.78 0.69

Thin Cable and Cable I

The maximum cable length used in trunk-drop topology, based on the data rate is:

Table V: Thin Cable and Cable I Topology

Communication Rate Trunk Length Maximum Drop Cumulative Drop

125 kb 100 m (328 ft) 6 m (20 ft) 100 m (328 ft)

250 kb 100 m (328 ft) 6 m (20 ft) 78 m (256 ft)

500 kb 100 m (328 ft) 6 m (20 ft) 39 m (128 ft)

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