NetAlert NetMeter User Manual

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Page 1

TMTM

NetMeter for

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Patent Pending

DeviceNet

Users Guide

P/N 715-0016 V1.2

Page 2

Essentials

DeviceNet Cable Essentials

AutoSearch Mode

Read this first!

DeviceNet cable has five wires inside. Each has a specific purpose which is referenced in this manual.

CANL

(messages)

Shield

V-

(power)

V+

(power)

CANH

(messages)

AutoSearch mode saves you time by finding the network measurements that exceed acceptable limits. It works by examining all measurements and then pinpointing any that exceed or are close to specified limits. For each problem measurement NetMeter indicates the measurement's switch position number in the upper left corner of the display. Rotate the selector switch to the indicated setting to view related measurements.

NetMeter requires 2 ‘AA’ Alkaline batteries for viewing measurements offline. NetMeter must be plugged into a powered network to get most measurements. NetMeter will run off DeviceNet network power, even without batteries installed. Remember to install batteries if you plan to use the Lock and offline viewing features.

How to Use AutoSearch ...

1. Make sure the Lock switch is in the “Run” position and turn the selector switch to AutoSearch

2. If you see - all measurements are within limits.

3. If you see or then read the display like this ...

“Switch setting <Setting #>, <MIN> or <MAX> and/or <P-P> is close to or Exceeds the spec limits.”

Then press and repeat the process for the next bad/marginal value.To get more detail, turn the selector switch to the indicated position and use the buttons to access related measurements.

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How to use this manual

This is a reference manual for the DeviceNet NetMeter (DN-MTR). For each NetMeter switch position you will find a page explaining the measurements available, and suggested actions and/or remedies if your network is not healthy.

On each page you’ll find:

The minimum shield voltage recorded since the NetMeter was plugged in or reset is -3.5V.

250

MIN

Displays the maximum frame rate per second on the network since the NetMeter was plugged in or reset.

LCD display

# of times to push the advance button after moving

the selector switch to display this measurement.

Description

Push the Advance

button

You can view this measurement for each active device by pressing the or buttons. Pressing and at the same time displays the overall network measurement again.

The measured value exceeds the positive or negative input range.

No measurement taken (see additional details for specific measurements).

Special Conditions:

Sign indicates negative over-range

250

MAX

AUTOSEARCH

MAC

Viewing measurement for this device (MAC ID)

Page 4

Using the NetMeter

To lock measurements for offline viewing move the lock switch to the position. To erase

Stored values are retained indefinitely, providing the lock switch is left in the position, and the

- even if the meter is turned off.

batteries are

good

stored values and

restart bus analysis move the lock switch to “Run”.

The NetMeter is reset (Min/Max and other stored measurements cleared) when the Lock switch is moved to the "Run" position, and when the power switch is turned On while the Lock switch is in the "Run" position.

You may reset stored measurements by either turning the meter off and on again, or by moving the Lock switch to and back to “Run”.

Each selector switch position accesses a different bus measurement, and each supports several different measurement types.

Pressing cycles the display through the different measurements available at each switch position.

Some measurements allow a detailed view for each MAC ID. Press OR to cycle through the active MAC IDs. Press AND together to return to the overall network view

Display Lock

Resetting Min/Max Measurements

Viewing Measurements

LCD Display

Pushbuttons

Selector switch

Next measurement Next MACID Previous MACID Return to Network

View (push at the same time)

Page 5

125 250 500

1 2 3 4 5 6 7 8 9

10 11

121315 14

Network MAC ID (node #) or NetMeter switch setting number (AutoSearch)

Display locked indicator (“lock” switch is on)

Measurement displayed is acceptable

Measurement displayed is marginal

Measurement displayed is unacceptable

Battery low - stored measurements may be lost

125 Kbaud network activity detected

250 Kbaud network activity detected

500 Kbaud network activity detected

Measurement unit is % bandwidth

Measurement unit is errors / messages per second

Measurement unit is volts

Measurement displayed is in thousands (kilo)

Measurement displayed is a maximum value

Measurement displayed is a minimum value

Displayed when viewing measurements for a particular MAC ID. Not displayed in AutoSearch mode when the value shown in the top left corner is a switch position.

valuepeak-to-peakaisdisplayedMeasurement

If none of MIN, MAX or P-P are shown then the value displayed is a “live” measurement, or the most recent “Live” measurement if the “lock” switch is on.

Display

Page 6

Bus Errors

NetMeter tracks network data transmission errors in realtime, and lets you know if the error rate is acceptable , marginal , or unacceptable . Any error rate greater than zero is undesirable (although your network may still function since CAN automatically retransmits after errors). An error rate greater than 10/s indicates a problem that should be investigated.

NetMeter uses unique technology to accurately determine which node was attempting to transmit when a bus error occurs

Display

What it means

250

MIN

250

Real-time error rate of 14 errors/second

Incremental error count on the entire network since the NetMeter was connected or reset.

Maximum bus error rate on the whole network since NetMeter was connected or reset.

Minimum bus error rate on whole network since NetMeter was connected to the network or reset.

250

MAX

Node error measurements only include errors known to have occurred when the node is transmitting. Frames with corrupt ID fields, and frames that cannot be attributed to specific nodes are not included in node measurements. It is common for the sum of per-node results to be less than the overall network values.

Page 7

A node set to the wrong baudrate causes bus errors

(affecting other nodes) when it attempts to go online.

Bus Errors

What do to when you see or :

If you suspect an intermittent cable or connector, shake, bend or twist the suspected cable and/or connector while watching the error rate for changes (up or down).

Check the other measurements and investigate the suspect device(s) for faults consistent with the observed symptoms. Some techniques you can use are:

Press or to identify the device(s) with higher error rates than other nodes. Calculate the ratio of error rate to frame rate of suspect nodes and check for above average ratios. Devices with above average error ratios should be investigated further.

Bus Errors deal with these two wires (CANL & CANH)

Replace the device and/or cabling Temporarily remove the device from the network to see of the errors cease.

BUS ERRORS

Excessive cable lengths and faulty nodes can cause errors in the transmissions of some/all other nodes. Do not assume that the node(s) with the highest error rate is faulty.

Thresholds:

Error Rate High Fault Error Rate High Warn

15 /s

1/s

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Bus Traffic

NetMeter continuously monitors the CAN bit-stream for message traffic. NetMeter reports Bus Traffic as either network bandwidth consumed (including bandwidth consumed by errors/retries) or bus frames per second.

Display

What it means

Current network or node bandwidth utilization.

Number of message frames per second on the network or node.

Maximum network or node bandwidth recorded since NetMeter was connected or reset.

Minimum network or node bandwidth recorded since the NetMeter was plugged into the network or reset.

Miinimum frame rate (/S) on the network or node since the NetMeter was plugged in or reset.

Maximum frame rate(/S) on the network or node since the NetMeter was plugged in or reset.

250

MIN

250

MAX

250

MAX

250

MIN

Node traffic measurements include only messages transmitted by the device except Group 2 master/slave traffic, where ALL traffic shows up on the slave MAC ID.

Page 9

Bus Traffic of 0% for a single node means that the node (MACID) has stopped communicating since the NetMeter was plugged in or reset!

Check the scanner configuration.

Setting the scan interval (or inter-scan delay) too short can cause device timeouts due to bandwidth or node performance limitations.

Setting the scan interval (or inter-scan delay) too long reduces system performance and makes inefficient use of available bandwidth.

Check for Change-of-State devices consuming excessive bandwidth (look for one or more nodes with excessive bandwidth or a MAX bandwidth much higher than average)

Note about frame rate: If you know the input and output size (in bytes) for a polled or strobed device (see your configuration or the device documentation) you can determine the scan rate (per second) as follows:

Bus Traffic deals with these two wires (CANL & CANH)

Scan rate =

Frame Rate (from NetMeter)

Input Frames + Output Frames

Input Frames =

Output Frames =

Input Bytes 8

(round up to whole number)

¸¸

( 7 if > 8 bytes)

Output Size 8

(round up to whole number, always 1 frame for strobe devices)

¸¸

( 7 if > 8 bytes)

Bus Traffic

Thresholds:

Bus Traffic High Warn Bus Traffic Low Warn

90.0%

10.0%

BUS TRAFFIC

For networks with bandwidth we suggest:

Page 10

Bus Power

NetMeter continuously monitors the DeviceNet bus power quality.

Display

What it means

Current network bus voltage is 17.2V.

Minimum bus voltage recorded since NetMeter was plugged in or reset is

17.1V.

Maximum peak-topeak (P-P) voltage recorded since NetMeter was plugged in or reset is

0.6V.

Current peak-topeak (P-P) voltage (transient or ripple) is 0.1Vp-p.

Maximum bus voltage recorded since NetMeter was plugged in or reset is

17.4V.

250

MIN

250

MAX

250

P-P

250

MAX

P-P

What’s a transient?

A transient is a short, temporary deviation of the bus voltage level.

Every DeviceNet network has some level of bus power transients, which is perfectly acceptable. Transients in excess of 2V P-P can contribute to node failures and communication errors in some cases and should be investigated. Transients in excess of 10V P-P are an indication of serious network problems..

Page 11

Bus Power measures voltage levels on these two wires (V+ / V-)

Check your power supply for proper installation and correct output voltage under load. Are your trunk/drop cables too long? Is one or more of your devices drawing too much current?

For bus power voltage levels we suggest:

Check for output devices (like contactors) powered from the network (they shouldn’t be). Check for network cables routed too close to strong sources of interference

Check for aging network power supply with output ripple increasing over time

For p-p (noise) levels we suggest:

Bus Power

Examples of transients

25V

13V

Thresholds:

High Voltage Fault Low Voltage Warning Low Voltage Fault High P-P Voltage Fault High P-P Voltage Warning

25.0V

14.0V

13.0V

10.0V

2.0V

BUS POWER

If you suspect an intermittent cable or connector, shake, bend or twist the suspected cable and/or connector while watching the P-P measurement for changes (up or down).

Page 12

Shield Voltage

NetMeter measures live, minimum, and maximum DC shield voltage (between shield and V-).

Display

What it means

Current shield voltage is -3.4V.

The minimum shield voltage recorded since the NetMeter was plugged in or reset is -3.5V.

The maximum shield voltage recorded since the NetMeter was plugged in or reset is -3.2V.

250

MIN

250

MAX

Thresholds:

High Voltage Fault High Voltage Warning Low Voltage Warning Low Voltage Fault

1.0V

0.3V

-4.0V

-5.0V

About DeviceNet Shield Votlage

The DeviceNet specification requires that the shield and V- be connected together, and both to earth ground at the power supply. This has the following effects:

A correctly connected shield has no current flow in it and is at the same voltage (grounded power supply V-) throughout the system. Current flow in V- causes a voltage rise in VRising V- voltage causes an apparent negative shift in the shield voltage when measured relative to V-

Since the maximum voltage drop in V- is 5V, the negative shift in shield voltage is between -5V and 0V Systems connected in accordance with the DeviceNet installation guidelines (except flat media) have a "normal" shield voltage between -5V and 0V

Page 13

Shield voltage measures the voltage on the shield wire relative to V-

Shield Voltage

Make sure the Shield and V- are connected to each other and to earth ground at the power supply (very important) Check for shorted or open shield wiring Check that your shield wire is actually grounded correctly (it’s so important you check it twice!) The NetMeter displays “OL” if the shield is not connected (or if the voltage is high).

For shield voltage levels we suggest:

SHIELD

Important! Some industrial applications and some endusers employ different shield connection techniques to meet specific requirements. In these cases the shield voiltage will differ from that expected in "typical" DeviceNet installations.

Semiconductor Fab Applications:

Disregard or shield voltage indications if the shield is intentionally connected differently than defined in the DeviceNet Specification.

Flat Media Applications:

Disregard or shield voltage indications in flat media applications as flat media has no shield. NetMeter should always display OL when connected to a flat media system.

Important! DeviceNet Flat Media has no shield, and shield voltage measurements are not relevant.

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CAN Primer

DeviceNet is based on the CAN protocol. A fundamental understanding of CAN will help you take full advantage of the NetMeter’s features and significantly improve your ability to diagnose network problems quickly.

CAN messages are transmitted as a difference in voltage between two separate wires, CANH (white) and CANL (blue). Differential transmission helps CAN and DeviceNet to operate well even with high levels of external interference (ie from sources like motors, welders, etc.) Here’s what you might see if you captured CAN signals on an oscilloscope:

Differential receiver cancels

noise and extracts data signal

CAN signals have two states, dominant (0) and recessive (1). The transceiver in each DeviceNet node determines whether a signal isa1ora0 based on the differential voltage between CANH and CANL.

CANH

CANL

Dominant

(D)

Recessive

(R)

CANH

CANL

Dominant Differential

Recessive Differential

Individual wires

include data + noise

Differential Signal (CANH - CANL)

Page 15

CAN Primer

Because the transceiver subtracts the CANH and CANL signals to determine the bit values, any noise induced in the cable (the same noise is induced in both wires) is cancelled. Transceiver chips require CANH and CANL voltages to be within specific limits otherwise a dominant (0) might be misinterpreted as a recessive (1) or viceversa resulting in errors.

These out-of-range signals could be misinterpreted

Good signal

DC common mode voltage (caused by voltage drop in the cable, refer to page 16 and 17) is the primary cause of the voltage shift illustrated above. Noise induced in the data wires also contributes to the voltage offset. If the combination of DC common mode voltage and induced noise causes the signal voltages to exceed the transceivers capabilities, bit errors are more likely to occur.

CANH,D

CANL,D

CANH,R

CANL,R

CANH/L Diff V, D

CANH/L Diff V, R

-5V

10V

Six separate CAN voltage measurements are essential to rapid troubleshooting. The NetMeter accurately measures these voltages at the following switch settings:

Page 16

Common Mode V

NetMeter measures the worst-case total Common Mode Voltage for your network (including DC CMV and noise).

What is Common Mode Voltage?

Common Mode Voltage is an incidental voltage that is common to both signal conductors in a differential transmission system. CMV manifests itself as an shift in signal voltage without any change in differential voltage.

Excessive CMV may cause signal voltages to exceed the capabilities of transceiver chips, ultimately resulting in communication errors.

The primary component of CMV is voltage drop in the power conductors. The cable resistance causes the V+ voltage to drop from 24 VDC with increasing distance from the power supply. Similarly, the V- voltage increases proportionally from 0VDC at the power supply. This offset results in each station having a slightly different reference point (V-) which causes an apparent shift in signal voltages from each node's point of view (the signal voltages don't really change, but the difference in V- makes it look that way).

Intermittent factors such as external interference, variations in network load current and electrical noise internal to nodes also contribute to CMV. Collectively, these intermittent factors are called "noise".

Total CMV is critical to network health. NetMeter measures total CMV over time and records the maximum. To measure worst-case total CMV, leave the NetMeter connected to the network for an appropriate period of time (one machine cycle, one shift, one day).

Display

What it means

Worst-case total CMV recorded since the NetMeter was plugged in or reset is 3.33V.

250

Common Mode Voltage can not be determined because there is no bus activity.

Page 17

Check for devices that might be drawing more current than you expect Verify your network design with special attention to cable length and load current calculations Move the power supply toward the middle of the network, or toward the nodes that draw the most current Investigate adding another power supply to reduce voltage offset in VHigh levels of external interference may require you to reduce the DC CMV limit below the 5V recommended in the DeviceNet Specification to keep total CMV below 6.5V

NetMeter's CMV measurements are not affected by where on the network you take the measurement. DC CMV problems are typically caused when devices draw more current than expected or when cable resistance is higher than expected (too much cable) or a combination of both. CMV problems can be intermittent since few devices have a constant load current.

Common mode voltage deals with these three wires (CANL, CANH, and V-)

Common Mode V

Thresholds:

CMV High Fault CMV High Warning

6.50V

5.00V

CMV

For CMV levels we suggest:

Notes About Common Mode Voltage (CMV)

Page 18

CANH/L Diff. V (R)

CANH/L differential (Recessive) shows you the difference between CANH and CANL for recessive bits:

Why is this measurement important?

Data bits (0's and 1's) are transmitted as differences in voltage between the CANH and CANL wires. The differential voltage measurements are essentially a measurement of "signal quality".

The recessive differential voltage is ideally zero, but typically is +/- a few millivolts.

A recessive differential voltage that is not sufficiently close to zero may be mis-interpreted by a transceiver as a dominant bit - resulting in communication errors.

Display

What it means

Current CANH/L recessive voltage differential is 0.09V.

Minimum CANH/L recessive voltage differential since the NetMeter was plugged in or reset is

0.08V.

Maximum CANH/L recessive voltage differential since NetMeter was plugged in or reset is

0.09V.

CANH/L diff. V(R) = CANHV(R) - CANLV(R)

Switch

9 117

250

MIN

250

MAX

Recessive differential bus voltage can not be measured because the bus is stuck dominant.

Page 19

Check for shorts and opens on the CANH and CANL wires Check for a missing or bad terminator (should be two 120 ohm terminators from CANH to CANL - one at each end of the network) Disconnect nodes one at a time or temporarily split the network to check for faulty transceivers or cables.

What is “recessive?”

DeviceNet messages consist of 1’s and 0’s. The recessive state of the bus (where the differential voltage between CANH and CANL is close to zero) represents the logical value 1 (opposite from what you might expect). The bus is always in the recessive state except when a node is transmitting.

NetMeter measures the difference between CANH and CANL for recessive bits on the network, and if the difference is not close to 0 volts, NetMeter indicates a warning or a fault.

CANH/L Diff. V deals with these two wires (CANL & CANH)

CANH/L Diff. V (R)

Thresholds:

Diff R Voltage High Fault Diff R Voltage Low Fault

0.08V

-0.18V

DIFFV(R)

For CANH/L differential recessive voltage levels we suggest:

Page 20

CANH/L Diff. V (D)

CANH/L differential shows you the difference between CANH and CANL for dominant bits:

Display

What it means

Current CANH/L dominant voltage differential is 1.67V.

Minimum CANH/L dominant voltage differential since the NetMeter was plugged in or reset is

1.00V.

Maximum CANH/L dominant voltage differential since NetMeter was plugged in or reset is

1.76V.

CANH/L diff. V(D) = CANHV(D) - CANLV(D)

Switch

10 128

250

MAX

250

MIN

Dominant differential bus voltage can not be measured because there is no bus activity.

Why is this measurement important?

See the description of "recessive" on page 18.

The dominant differential voltage is usually around 2V. A lesser differential voltage may be mis-interpreted by a transceiver as a recessive bit - causing bus errors.

At the beginning of each frame it is possible for several nodes to transmit simultaneously resulting in a dominant differential >3V. NetMeter accurately measures dominant voltage by sampling only when one node is transmitting.

A measured dominant differential (single node transmitting) larger than 3V is a clear indication of a network problem.

Why is this measurement important?

Page 21

CANH/L Diff. V (D)

Thresholds:

Diff D Voltage High Fault Diff D Voltage High Warning Diff D Voltage Low Warning Diff D Voltage Low Fault

3.00V

2.75V

1.45V

1.20V

CANH/L Diff. V deals with these two wires (CANL & CANH)

DIFFV(D)

What is “Dominant”?

DeviceNet messages consist of 1’s and 0’s. The dominant state of the bus (where the differential voltage between CANH and CANL is around 2V) represents the logical value 0 (opposite from what you might expect). The bus can only be in the dominant state when a node is actively transmitting.

NetMeter measures the difference between CANH and CANL for dominant bits on the network, and if the difference is not within acceptable limits, NetMeter indicates a warning or a fault.

Check for shorts and opens on the CANH and CANL wires Check for a missing, bad, or extra terminators (should be two 120 ohm terminators from CANH to CANL - one at each end of the network !) Disconnect nodes one at a time or temporarily split the network to check for faulty transceivers or cables.

and no more

For CANH/L differential dominant voltage levels we suggest:

Page 22

CAN Signal Thresholds

Thresholds:

Switch

CANH D Voltage High Fault CANH D Voltage High Warning CANH D Voltage Low Warning CANH D Voltage Low Fault

10.00V

8.50V

-1.25V

-2.25V

Switch

CANL D Voltage High Fault CANL D Voltage High Warning CANL D Voltage Low Warning CANL D Voltage Low Fault

7.75V

6.25V

-3.50V

-4.50V

Switch

CANH/L R Voltage High Fault CANH/L R Voltage High Warning CANH/L R Voltage Low Warning CANH/L R Voltage Low Fault

8.50V

7.00V

-2.00V

-3.00V

9 11

DeviceNet messages consist of 1's and 0's, which are represented as differences in voltage between the CANH and CANL wires. However, if the absolute voltage of the signal (measured to the V- wire at any node) is too high or too low, bits may not be received correctly. NetMeter measures each of the key CANH, CANL and Differential voltages, and if the readings are too high or low, NetMeter indicates a warning or fault.

Recessive bus voltage can not be measured because the bus is stuck dominant. (or CAN wires are flipped)

Dominant bus voltage can not be measured because there is no bus activity.

9 11

Page 23

DeviceNet Glossary

Bandwidth:

CANbus:

Configuration:

Determinism:

Frame Rate:

MACID:

DeviceNet, like other serial networks, supports a certain number of bits per second sent on the wire. The actual network traffic is reported as a percentage of the theoretical maximum, and is called % Bandwidth. NetMeter's measurements include bandwidth lost due to bus errors and retries but most other diagnostic tools only include messages in bandwidth calculations.

DeviceNet is based on a low-level network standard known as CAN or CANbus. Other networks that use CAN include CANOpen and SDS. Although these networks are based on CAN, physical layer and upper layer protocol differences limit the use of the NetMeter with these networks.

Because DeviceNet networks allow you to use devices in many different ways, each device must be configured before it will work properly on a DeviceNet network. For some devices, this is as simple as setting a switch to select the MACID (node address) and baud rate. Other devices require configuration from a PCbased software tool (Available from SST). Most importantly, configuration means that before you replace a device with another, identical device, you must configure the replacement device properly.

Determinism is a measure of the predictability of the performance of a system (including but not limited to networks). Communication errors and delays caused by high bandwidth utilization reduce determinism, making the system less predictable in its operation (less deterministic).

DeviceNet messages are sent in one or more CAN message structures called Frames. Frame Rate is the number of these structures sent in 1 second. Since one DeviceNet message may require several CAN frames, the frame rate is not necessarily the same as the message rate.

Each device on a DeviceNet network has a unique "Address", a number between 0 and 63. This Address is known as the MACID or Node number.

successful

CANH / CANL

Page 24

DeviceNet Glossary

Noise:

P-P:

Ripple:

Terminator:

Transceiver:

Transient:

An undesirable intermittent voltage on a network

signal or power wire.

Peak to peak measurements of varying voltage signals indicate the difference between the minimum and maximum values within a specific interval.

A regular, repeated deviation from the mean

voltage of a power or signal conductor.

1) A resistor connected at the end of a transmission line (network cable) to prevent signal reflections caused by impedance mismatches. DeviceNet requires two 120 ohm terminators, one at each end of the network. DeviceNet terminating resistors also define the recessive state of the network by ensuring that CANH and CANL return to zero differential after a dominant bit.

A transceiver is a circuit (typically a chip) that converts digital bits to/from the differential voltages on the network cable. Transceiver is a contraction of

mitter and re .

A temporary deviation from the mean voltage

of a power or signal conductor.

trans ceiver

The NetMeter has two configuration switches located in the battery compartment.

The Meter Power switch (on left) selects between bus/battery power (powered by bus when available) and battery only power. Selecting battery only power eliminates the possibility of inadvertently contributing to common mode voltage problems on extremely long networks but limits NetMeter use to about 7 hours on fresh batteries..

The Alarm Sound switch (on right) enables and disables the “beep on error/transient” feature. With this feature enabled NetMeter beeps each time a bus error or transient occurs when the selector switch is in the corresponding position.

Switch Settings

Alarm

Sound

Meter

Bus/Battery

Battery Only

Power

Off

Page 25

Certifications

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.

NOTE: This equipment has been tested and found to comply with the limits for Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Warning: Changes or modifications not expressly approved by SST, a division of Woodhead Canada, could void the user's authority to operate the equipment.

This Class (A) digital apparatus complies with Canadian ICES-003.

FCC

Industry Canada

This device meets or exceeds the requirements of the following standard(s):

UL3111-1 Can/CSA C22.2

CAT II 30V

LISTED

MEASURINGAND

TESTING EQUIPMENT

1WA4

Page 26

Certifications

Marking of this equipment with the symbol CE indicates compliance with European Council Directive 89/336/EEC - The EMC Directive as amended by 92/31/EEC and 93/68/EEC.

To maintain compliance with the limits and requirements of the EMC Directive it is required to use quality interfacing cables and connectors when connecting this device. Refer to the cable specifications in the Hardware Guide for selection of cable types.

This device meets or exceeds the requirements of the following standard:

EN 61326:1997 including amendment A1:1998 "Electrical equipment for measurement, control and laboratory use - EMC requirements.”

This is a Class A product. In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures.

This equipment is neither designed for, nor intended for operation in installations where it is subject to hazardous voltages and/or hazardous currents.

Note:

Warning!

Caution!

Cables

The NetMeter is designed for use with the supplied cables or the following Brad Harrison replacement cables:

DND-21A-M010 DND-22A-M010

Page 27

Information & Support

Warranty

Care & Cleaning

For more information or technical support for the NetMeter for DeviceNet or any other NetAlert product, please contact your local Woodhead Connectivity Distributor or one of our offices below:

SST/Woodhead Connectivity guarantees that all new products are free from defects in material and workmanship when applied in the manner for which they were intended and according to SST’s published information on proper installation. The Warranty period for the NetAlert NetMeter for Devicenet is one year from the date of shipment.

SST/Woodhead Connectivity will repair or replace, at our option, all products returned freight prepaid, which prove upon examination to be within the Warranty definitions and time period.

The Warranty does not cover costs of installation, removal, or damage to user property or any contingent expenses or consequential damages. Maximum liability of SST/Woodhead Connectivity is the cost of the product(s).

If your NetMeter requires cleaning we recommend using only a soft dry cloth. Solvents or water may enter the enclosure with undesirable consequences.

SST division of Woodhead Canada Limited

Toll free: 877-427-0850 Direct: 519-725-5136 Email: [email protected]

[email protected]

Woodhead LP

Toll free: 877-427-0850 Direct: 847-272-7990

Woodhead Canada Limited

Direct: 905-624-6518

Page 28

any form without the prior written permission of Woodhead Canada Limited.

NetAlert, NetMeter and SST are trademarks of Woodhead Industries, Inc. All other trade names are trademarks or registered trademarks of their respective companies.

SST strives to ensure accuracy in our documentation. However, due to rapidly evolving products, on occasion software or hardware changes may not have been reflected in the documentation. If you notice any inaccuracies, please contact us.

Publication Revision: 1.2 Publication Date: February, 2002

SST, part of Woodhead Connectivity

50 Northland Road, Waterloo, Ontario Canada N2V 1N3 Tel (519) 725-5136

www.myNetAlert.com www.mySST.com www.woodheadconnectivity.com

Document Info

Specifications

Environment

Bus Power Voltage Measurement

Maximum Limits

Power Supply

Shield Voltage Measurement

CAN Voltage Measurement

Storage Temperature

Range

Voltage between any two terminals

Network Power Battery Power

Range

-40ºC to 85ºC

2V to 26V & reverse polarity

2 X AAAlkaline Batteries

60mA @ 11Vdc to 30Vdc

-10V to 1V

-5.25V to 9.98V

Operating Temperature

Calibrated Accuracy (DC)

Calibrated Accuracy

Calibrated Accuracy (signal)

0ºC to 40ºC

±30Vdc

0.5% ±1 count

0.5% ±2 counts±20mV

Humidity 5% to 90% (non-condensing)

Calibrated Accuracy (diff.) 1.0% ±4 counts±20mV

Calibrated Accuracy (P-P) 1.0% ±2 counts