Download 1788-UM001A-US-P, ControlNet NetChecker User Manual

ControlNetTM
NetChecker
1788-CNCHKR
TRAFFIC
INPUT
Low Bat
2XWSXWWR6FRSH
Signal (x1/4)
GND
Trigger
3RZHU6ZLWFK
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L M H
Threshold
Node On Line
7
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6
OFF
ON
Push ON
5
Slow Edges
4
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0
7
Illegal Framing
3
Poor Signal
Quality
2
Pass/Fail
1
0LQ
Push ON
Buzzer
Ext
Power
5VDC
0.25A
ControlNetTM NetChecker
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User Manual
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Table of Contents
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
NetChecker Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TRAFFIC LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Modes of Network Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Diagnostic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Threshold Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LED Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Node Finder and Oscilloscope Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Bargraph Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Bargraph Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Viewing a Node Signal Level in Bargraph Mode . . . . . . . . . . . . . . . . . . . . . 8
Performing a Global Survey of Signal Levels . . . . . . . . . . . . . . . . . . . . . . . 9
Oscilloscope Output in Bargraph Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Installing the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Conserving Battery Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Using a Wall Adapter to Power the NetChecker. . . . . . . . . . . . . . . . . . . . . 10
Connecting to the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Selecting Testpoints on the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Network Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
How to Begin Checking Your Network. . . . . . . . . . . . . . . . . . . . . . . . 12
Faults and Their Origins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Poor Signal Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Illegal Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Slow Edges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Checking the Signal Level Using the Threshold Setting . . . . . . . . . . . . . . 17
Checking the Signal Level Using the Bargraph . . . . . . . . . . . . . . . . . . . . . 18
Additional Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Intermittent Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Continuous Network Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Publication 1788-UM001A-US-P - November 1999
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Table of Contents
Example Waveforms
Ideal Transmitted Packet on ControlNet
(as seen at transmitting node) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ideal Received Packet on ControlNet
(as seen at receiving node). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example of Waveform Seen When Network
is Improperly Terminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Effect of Attenuation on Signal Edges . . . . . . . . . . . . . . . . . . . . . . . .
Publication 1788-UM001A-US-P - November 1999
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A-2
A-2
A-3
A-4
Product Overview
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Publication 1788-UM001A-US-P - November 1999
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SW1
(on the side)
BNC Connector
TRAFFIC
INPUT
Low Bat
,
2XWSXWWR6FRSH
'LDJQRVWLF
3RZHU6ZLWFK
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L M H
Signal (x1/4)
GND
Trigger
SW3
Threshold
Node On Line
7
0D[
6
OFF
ON
Push ON
5
Slow Edges
4
Illegal Framing
3
Poor Signal
Quality
2
Pass/Fail
1
Input
Jack
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Push ON
Buzzer
Ext
Power
5VDC
0.25A
ControlNetTM NetChecker
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1788-CNCHKR ControlNet™
NETCHECKER
Publication 1788-UM001A-US-P - November 1999
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3
NetChecker Specifications
Dimensions
152 x 83 x 33.5 mm (BNC connector not included)
164 x 83 33.5 mm (BNC connector included)
Weight (with batteries)
250 grams (8.18 oz.)
Environmental
Operating Temperature: 0 to 50° C
Storage Temperature: -40° to +85° C
Slide Switch SW1:
3-position power switch:
• OFF disconnects the batteries.
• ON turns on the tool permanently.
• Push ON provides momentary power.
Push Switch SW2:
Momentary switch to turn on the instrument when SW1 is in the
Push ON position.
Slide Switch SW3:
4-position function switch:
• Positions L, M, H select the Diagnostic Mode and Low, Medium
and High Thresholds.
• The rightmost position selects the Bargraph Mode.
BNC Connector:
Signal input. Connects to the network trunk cable via a standard tap
or the provided cable and BNC “T”. The NetChecker is electrically
isolated from the network by a transformer.
Display:
8 bi-color (Red/Green) LEDs:
• LEDs numbered 1 to 7 are dual-function for Diagnostic or
Bargraph Modes
• LED named TRAFFIC also indicates Low Battery condition.
Thumbwheel Switches:
2-digit decimal switches for entering the address of the Node to find
(0 to 99).
DC Jack:
External DC power from AC adapter (nominal 5VDC, max 5.5V @
0.25A). Jack should have 3.5mm external diameter (+) and 1.35mm
internal diameter (-).
Oscilloscope Connector:
3-pin Phoenix connector with Network, Ground, and Trigger Signals.
Buzzer:
Piezo Buzzer provides an audible indication of detected faults.
Batteries:
2 alkaline batteries 1.5V AA/LR6 size located in the battery
compartment on the back of the tool. Batteries are provided
uninstalled with the tool. A phillips head screwdriver is required to
install or replace the batteries.
Battery Life
6 hours continuous use
Accessories:
•
•
•
•
3-pin plug connector to fit in the Oscilloscope Output
BNC “T” connector
BNC male to BNC female coaxial cable (1 meter long)
User Manual 1788-UM001A-US-P.
Publication 1788-UM001A-US-P - November 1999
4
NetChecker Specifications
Agency Certification
(When product or
packaging is so marked)
• EN 55011, Radiated Emission Class A
• ENV 50204, Radiated immunity from digital radio
• IEC 1000-4-2, ESD susceptibility
• IEC 1000-4-3, Radiated immunity
• IEC 1000-4-4, EFT/B immunity
• IEC 1000-4-6, conducted RF immunity
TRAFFIC LED
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Modes of Network Analysis
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Publication 1788-UM001A-US-P - November 1999
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Threshold Settings
Sensitivity to Noise
SW3 Position
Reference Voltage
(mV)
Volts (peak-to-peak)
Most Sensitive
L
300
0.6
Moderately Sensitive
M
450
0.9
Least Sensitive
H
600
1.2
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Publication 1788-UM001A-US-P - November 1999
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Publication 1788-UM001A-US-P - November 1999
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Buzzer
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LQGLFDWRU7KLVLQGLFDWRUGLVSOD\VWKHOHYHORIWKHVLJQDOIURPWKHQRGH
VHOHFWHGE\WKH1RGH)LQGHU:KHQWKH1RGH)LQGHULVVHWWR LWSURYLGHV
DJOREDOYLHZRIWKHVLJQDOOHYHOPD[LPXPDQGPLQLPXPRIDOOWKH
PHVVDJHVVHHQRQWKHQHWZRUN
Publication 1788-UM001A-US-P - November 1999
8
,Q%DUJUDSKPRGHWKH3RRU6LJQDO4XDOLW\DQG,OOHJDO)UDPLQJGHWHFWLRQV
DUHSHUIRUPHGZLWKWKHWKUHVKROGGHIDXOWHGWR00HGLXP,I3RRU6LJQDO
4XDOLW\RU,OOHJDO)UDPLQJDUHGHWHFWHGWKH\DUHVLJQDOOHGRQO\E\WKHEX]]HU
7KH6ORZ(GJHVGHWHFWLRQLVQRWSHUIRUPHGLQ%DUJUDSKPRGH
Bargraph Scale
7KH%DUJUDSKLVQRWDSUHFLVLRQYROWPHWHU7KH/('VDUHQXPEHUHGIURP
ORZHVWSHDNWRSHDNYROWDJHRU9SSWRKLJKHVW9SS$OVRQRWHWKDW
WKHVFDOHLVQRWOLQHDU7KHIROORZLQJWDEOHVKRZVWKHDSSUR[LPDWH
SHDNWRSHDNYROWDJHVLQGLFDWHGE\HDFK/('
LED
Vpp Level
LED GREEN if
7
9.5
no green state
6
7.5
7.5 Vpp < signal level < 9.5 Vpp
5
5.75
5.75 Vpp < signal level < 7.5 Vpp
4
4.5
4.5 Vpp < signal level < 5.75 Vpp
3
3.25
3.25 Vpp < signal level < 4.5 Vpp
2
2
2 Vpp < signal level < 3.25 Vpp
1
0.75
0.75 Vpp < signal level < 2 Vpp
LED RED if
signal level > 9.5 Vpp
no red state
signal level < 0.75 Vpp
/('ZLOOWXUQUHGLIWKHVLJQDOOHYHOH[FHHGV9SS2WKHUZLVHLWZLOOEH
RII/('FDQKDYHRQHRIWKUHHVWDWHVUHGLIWKHVLJQDOLQSXWLVOHVVWKDQ
9SSJUHHQLIWKHVLJQDOLQSXWLVEHWZHHQDQG9SSDQGRIIXQGHU
DQ\RWKHUFRQGLWLRQ/('VWRFDQRQO\EHJUHHQRURII
2QO\WZR/('VRQWKH%DUJUDSKFDQEHWXUQHGRQDWWKHVDPHWLPHRQH
LQGLFDWLQJWKHPD[LPXPOHYHODQGWKHRWKHULQGLFDWLQJWKHPLQLPXP,IWKH
PD[LPXPDQGWKHPLQLPXPOHYHOVDUHWKHVDPHRQO\RQH/('ZLOOWXUQRQ
Viewing a Node Signal Level in Bargraph Mode
7RFKHFNWKHVLJQDOOHYHOIURPDSDUWLFXODUQRGHVHW6:WRWKHULJKWPRVW
SRVLWLRQDQGVHWWKHDGGUHVVRIWKHQRGHRQWKH1RGH)LQGHUWKXPEZKHHOV
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ORZRUKLJKLQGLFDWLRQGRHVQRWQHFHVVDULO\PHDQWKDWWKHQRGHLWVHOILVIDXOW\
,IDOORIWKH/('VDUHRIIWKH1HW&KHFNHUGRHVQRWGHWHFWDQ\VLJQDOIURPD
QRGHKDYLQJWKHDGGUHVVHQWHUHG
Publication 1788-UM001A-US-P - November 1999
9
IMPORTANT
,QQHWZRUNVLQZKLFKUHSHDWHUVDUHXVHGWKHOHYHOUHDGRQ
WKH%DUJUDSKIRUQRGHVWKDWDUHEHKLQGDUHSHDWHULHRQ
DQRWKHUWUXQNFDEOHWKDQWKHRQHEHLQJWHVWHGLVWKHOHYHO
RIVLJQDOIURPWKHUHSHDWHU
Performing a Global Survey of Signal Levels
7RSHUIRUPDJOREDOVXUYH\RIWKHVLJQDOOHYHOVRIDOOPHVVDJHVRQDQHWZRUN
VHW6:WRLWVULJKWPRVWSRVLWLRQDQGVHWWKH1RGH)LQGHUWKXPEZKHHOVWR
]HUR7KH1HW&KHFNHUZLOOGLVSOD\WZRJUHHQ/('VLQGLFDWLQJWKH
VWURQJHVWDQGWKHZHDNHVWOHYHOVHQFRXQWHUHGRQWKHQHWZRUN7KHPD[LPXP
DQGWKHPLQLPXPOHYHOVLQGLFDWHGUHPDLQODWFKHGXQWLO1HW&KHFNHUSRZHULV
F\FOHG
Oscilloscope Output in Bargraph Mode
,Q1RGH6LJQDO/HYHO%DUJUDSKPRGHWKH2VFLOORVFRSH2XWSXWLV
RSHUDWLRQDOLQWKHVDPHZD\DVLQ'LDJQRVWLFPRGH,Q*OREDO%DUJUDSK
PRGHKRZHYHUQRWULJJHUVLJQDOLVSURYLGHGVLQFHWKHUHFDQEHQR
&RQWURO1HWQRGHDWDGGUHVV
Publication 1788-UM001A-US-P - November 1999
10
Operation
Installing the Batteries
8VHD3KLOOLSVKHDGVFUHZGULYHUWRUHPRYHWKHWZRVFUHZVIURPWKHEDWWHU\
FRYHURQWKHEDFNRIWKH1HW&KHFNHU,QVWDOOWKHWZR9$$EDWWHULHV
VXSSOLHGDVLQGLFDWHGLQWKHFRPSDUWPHQW%DWWHULHVLQVWDOOHGLQFRUUHFWO\PD\
GDPDJHWKHLQVWUXPHQW8VHRQO\DONDOLQHEDWWHULHVIRUUHSODFHPHQW
Conserving Battery Power
7RFRQVHUYHEDWWHU\SRZHUZKHQXVLQJWKH1HW&KHFNHUVHWSRZHUVZLWFK
6:WRWKH´3XVK21µSRVLWLRQWKHQSUHVVDQGKROGWKH3XVK21EXWWRQ
IRUMXVWWKHWLPHQHFHVVDU\DIHZVHFRQGVWRUHDGWKH/('V,I\RXQHHG
\RXUKDQGVIUHHVHW6:WRWKH´21µSRVLWLRQPLGGOHVRWKDWWKH
1HW&KHFNHUUHPDLQVSRZHUHGRQ5HPHPEHUWRSXW6:EDFNWRWKH2))
SRVLWLRQZKHQ\RXDUHGRQH
Using a Wall Adapter to Power the NetChecker
7KH1HW&KHFNHUPD\DOVREHSRZHUHGE\DZDOODGDSWHUFRQQHFWHGWRWKH
([WHUQDO3RZHUFRQQHFWRURQWKHVLGHRIWKHWRRO7KHDGDSWHUVKRXOG
SURGXFHDUHJXODWHG9'&#$YROWVPD[7KHLQWHUQDOEDWWHULHV
DUHGLVFRQQHFWHGZKHQWKHDGDSWHU·VMDFNLVLQVHUWHGLQWKHFRQQHFWRU7KH
1HW&KHFNHUUHPDLQVRSHUDWLQJDVORQJDVSRZHULVSURYLGHGVZLWFKHV6:
DQG6:DUHQRWDFWLYHLQWKHH[WHUQDOSRZHUPRGHKRZHYHULWLVEHWWHUWR
OHDYH6:LQWKH2))SRVLWLRQ
ATTENTION
!
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WKDWWKHV\VWHPIRUPHGE\WKH1HW&KHFNHUSOXVWKH
DGDSWHULVDOVR&(FRPSOLDQW
Publication 1788-UM001A-US-P - November 1999
11
Connecting to the Network
&RQQHFWWKH1HW&KHFNHUWRWKHQHWZRUNXVLQJHLWKHUDVWDQGDUGFRQWURO1HW
WDSRUWKH%1& ´7µDQGFDEOHSURYLGHG,I\RXGRQRWZDQWWRRSHQWKH
QHWZRUN\RXFDQLQVWDOOVRPHIUHHWDSVIRUWHVWLQJ:LWKDUHGXQGDQW
QHWZRUN\RXFDQWHPSRUDULO\GLVFRQQHFWRQHRIDQRGH·VWDSVIURPWKH
QHWZRUNDQGWHVWIURPWKLV5HFRJQL]HKRZHYHUWKDW\RXDUHUHPRYLQJD
QRGHIURPWKHQHWZRUN7HVWWKDWQRGHODWHUIURPDGLIIHUHQWORFDWLRQRQWKH
QHWZRUN
:KHQ\RXSUHVVWKH21VZLWFKWKH75$)),&/('VKRXOGWXUQJUHHQWR
LQGLFDWHWKDWPHVVDJHVDUHEHLQJGHWHFWHG7KHJUHDWHUWKHYROXPHRIWUDIILF
VHHQRQWKHQHWZRUNWKHEULJKWHUWKH/('ZLOOEHLOOXPLQDWHG,IWKH/('
UHPDLQVRIIWKHQHWZRUNLVHLWKHULQDFWLYHRUWKHWHVWHGVHJPHQWRIFDEOHLV
GLVFRQQHFWHGIURPWKHQHWZRUN&KHFNWKHFDEOHDQGWKHFRQQHFWRUV
Selecting Testpoints on the Network
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WHVWRQO\%HFDXVHWKHGHIHFWVFDXVHGE\DVLQJOHLPSHGDQFHPLVPDWFKDUH
YDULDEOHDORQJWKHFDEOHand are also related to the node that is
transmitting,DQHWZRUNVHJPHQWVKRXOGEHWHVWHGDWVHYHUDOSRLQWV)RU
H[DPSOHWHVWQHDUWKHWZRHQGVRIWKHFDEOHDQGDWRQHRUPRUHSRLQWVDORQJ
WKHFDEOHGHSHQGLQJRQWKHFDEOHOHQJWKDQGWKHQXPEHURIQRGHV,I
UHSHDWHUVDUHXVHGHYHU\VHJPHQWEHWZHHQUHSHDWHUVVKRXOGEHFKHFNHG2Q
DUHGXQGDQWQHWZRUNFKHFNERWKRIWKHFDEOHV
7KH1HW&KHFNHUFDQLQGLFDWHWKDWWKHUHLVDSUREOHPRQWKHWHVWHGQHWZRUN
EXWLWFDQQRWLQGLFDWHZKHUHWKHSUREOHPRULJLQDWHG+RZHYHULWFDQKHOSWR
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WKDWWKHVRXUFHRIDSUREOHPPD\EHIDUDZD\IURPWKHSRLQWRIDQDO\VLV
TIP
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Publication 1788-UM001A-US-P - November 1999
12
Network Diagnostics
7KLVVHFWLRQGHVFULEHVSURFHGXUHVIRUHYDOXDWLQJWKHTXDOLW\RIWKH
&RQWURO1HWQHWZRUN
How to Begin Checking Your Network
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WKUHHWKUHVKROGVHWWLQJV/0DQG+EXWEHVXUHWRSHUIRUPWKHWHVWDWDOO
WKUHHVHWWLQJV7KHQVHW6:WRWKH%DUJUDSKULJKWPRVWSRVLWLRQDQG
H[DPLQHWKHJOREDOVLJQDOOHYHORQWKHQHWZRUNE\VHWWLQJWKH1RGH)LQGHU
WKXPEZKHHOVWR
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SUREOHPDWWKHWHVWSRLQW
LED
State
TRAFFIC
Green
Pass/Fail
Green
Fault LEDs
All Off
Buzzer
Does not sound.
Bargraph indication
Within range of 2 to 6
for all thresholds, L, M, and H
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\RXUQHWZRUN
Faults and Their Origins
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(GJHV,IDIDXOWLVGHWHFWHGZKHQFKHFNLQJLQWKH'LDJQRVWLFPRGHWKH
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WKUHVKROGOHYHOZLOOGLVDSSHDURUEHVHHQOHVVIUHTXHQWO\DVWKHWKUHVKROGLV
LQFUHDVHG+RZHYHULQVRPHFDVHVZKHUHWKHUHFHLYHGVLJQDOKDVDORZOHYHO
OHVVWKDQRQWKH%DUJUDSKVFDOHIDXOWVPD\DSSHDURUWKHLUUHFXUUHQFH
PD\LQFUHDVHDVWKHWKUHVKROGLVUDLVHG
Publication 1788-UM001A-US-P - November 1999
13
8VHWKHWDEOHEHORZDVDJXLGHOLQHZKHQHYDOXDWLQJ\RXUQHWZRUN
Threshold (SW3)
L
M
H
No Fault
No Fault
No Fault
Very clean
Fault
No Fault
No Fault
Clean. Acceptable
Fault
Fault
No Fault
May be acceptable after cabling
inspection
Fault
Fault
Fault
IMPORTANT
Network quality at the point of test
Network needs inspection
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7U\WRHYDOXDWHUHVLGXDOSUREOHPVXVLQJWKH1RGH)LQGHUDQGDQRVFLOORVFRSH
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\HOORZDQGDQDO\]HWKHPHVVDJHVWKHIDXOWVPD\FRPHIURPVLJQDO
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TIP
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SRVVLEOHSUREOHPVZLWKQHWZRUNFDEOLQJDQGWKDWLWV
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VSHFLILFDWLRQ
Publication 1788-UM001A-US-P - November 1999
14
Poor Signal Quality
3RRU6LJQDO4XDOLW\KDVWKHIROORZLQJLQGLFDWLRQV
LED
State
TRAFFIC
Green
Slow Edges
May also be blinking Red
Illegal Framing
May also be blinking Red
Poor Signal Quality
Blinking Red
Pass/Fail
Yellow or Red
Buzzer
Sounds
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DUHSUHVHQWRQWKHQHWZRUN,I\RXUHFHLYHWKLVLQGLFDWLRQFKHFNWKHQHWZRUN
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UHVLVWDQFHRULQWHUPLWWHQWFRQWDFWLQ%1&FRQQHFWRUVQHDUWKHWDSV
*HQHUDOO\WKHIDXOWVDUHUHSRUWHGDWWKHORZHUWKUHVKROGVHWWLQJVDQG
GLVDSSHDURUGHFUHDVHDWWKHKLJKHUVHWWLQJV
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LVORZRUOHVVRQWKH%DUJUDSKVFDOHFKHFNWKHWUXQNFDEOHOHQJWKYHUVXV
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PHWDOZLUHZD\RU',1UDLO
IMPORTANT
An unused drop cable should be terminated by a dummy load
(1786-TCAP). Do not use a 75 ohm termination along with a
bullet connector. The impedance here is not 75 ohms.
,QGLVRUGHUVFDXVHGE\LPSHGDQFHPLVPDWFKHV3RRU6LJQDO4XDOLW\PD\EH
UHSRUWHGDORQJZLWK,OOHJDO)UDPLQJDQGSRVVLEO\6ORZ(GJHVIRUDOOWKH
WKUHVKROGVHWWLQJV7KLVLQGLFDWHVODUJHLPSHGDQFHPLVPDWFKHVFDXVHGE\DQ
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GLIILFXOW\GHWHFWLQJWKHSUHVHQFHRIVRPHQRGHVRQWKHQHWZRUNEHFDXVHRI
WKHKLJKDPRXQWRIGLVWRUWLRQ
Publication 1788-UM001A-US-P - November 1999
15
,QFDVHVZKHUHWKHUHFHLYHGVLJQDOKDVDORZOHYHOOHVVWKDQRQWKH
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WKHLUUHFXUUHQFHPD\LQFUHDVHDVWKHWKUHVKROGLVLQFUHDVHG0DNHVXUHWKDW
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LQDGHTXDWHFRD[LDOPHGLDXVHGIRUWKHWUXQNFDEOHRUVHJPHQWV+LJK
UHVLVWDQFHDWWKHFRQWDFWSRLQWVRIWKH%1&FRQQHFWRUVRQWKHWUXQNFDEOH
PD\DOVRDGGDEQRUPDOVLJQDODWWHQXDWLRQ
Illegal Framing
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LED
State
TRAFFIC
Green
Slow Edges
May also be blinking Red
Illegal Framing
Blinking Red
Poor signal Quality
May also be blinking Red
Pass/Fail
Yellow or Red
Buzzer
Sounds
,OOHJDO)UDPLQJRFFXUVLIVKRUWPHVVDJHVRUVKRUWEHWZHHQPHVVDJHJDSV
KDYHEHHQGHWHFWHG,OOHJDO)UDPLQJGHWHFWLRQLVGHSHQGHQWRQWKHWKUHVKROG
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,OOHJDO)UDPLQJPRVWOLNHO\LQGLFDWHVDKLJKOHYHORIVLJQDOUHIOHFWLRQVRQWKH
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• WKHIDXOWLVUHSRUWHGHYHU\ZKHUHRQWKHQHWZRUNEXWWKH%DUJUDSKVKRZV
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Publication 1788-UM001A-US-P - November 1999
16
Slow Edges
6ORZ(GJHVKDVWKHIROORZLQJLQGLFDWLRQV
LED
State
TRAFFIC
Green
Slow Edges
Blinking Red
Illegal Framing
May also be blinking Red
Poor signal Quality
May also be blinking Red
Pass/Fail
Yellow or Red
Buzzer
Sounds
6ORZ(GJHVLVJHQHUDOO\UHSRUWHGZKHQDZHDNLQSXWVLJQDOZLWKSRRUVORZ
ULVLQJIDOOLQJHGJHVLVLGHQWLILHG7KLVPD\RFFXUZLWKVLJQDOVUHFHLYHGIURP
UHPRWHVWDWLRQVRQORQJQHWZRUNVZLWKDODUJHQXPEHURIQRGHV,QWKLVFDVH
6ORZ(GJHVGHWHFWLRQLVQRWLQIOXHQFHGE\WKHWKUHVKROGVHWWLQJRQ6:
0DNHVXUHWKDWWKHFDEOHOHQJWKYHUVXVQXPEHURIQRGHVPHHWVWKH
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WROHUDWHGRQORQJQHWZRUNVSURYLGHGWKDWWKH%DUJUDSKVKRZVWKDWWKH
PLQLPXPOHYHOLVFRUUHFW
6ORZ(GJHVPD\DOVREHUHSRUWHGDORQJZLWK3RRU6LJQDO4XDOLW\DQG,OOHJDO
)UDPLQJLQWKHFDVHRIVWURQJLPSHGDQFHPLVPDWFKHVRQWKHQHWZRUN
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PD\LQIOXHQFHWKHUHFXUUHQFHRIWKHIDXOWV
Publication 1788-UM001A-US-P - November 1999
17
Examples
7KHILJXUHVEHORZVKRZH[DPSOHVRIWKHUHSRUWLQJE\WKH1HW&KHFNHU
Checking the Signal Level Using the Threshold Setting
,QWKHH[DPSOHDWOHIWWKH1HW&KHFNHUUHSRUWVQRIDXOWDWWKHKLJKHVW
VHQVLWLYLW\/RZ7KUHVKROG7KHQHWZRUNLV2.DWWKHSRLQWRIWHVW7KH
/('´1RGH2Q/LQHµLVJUHHQEHFDXVHWKHUHLVDQRGHWUDQVPLWWLQJDW
DGGUHVV
7KHH[DPSOHDWULJKWVKRZVIDXOWVUHSRUWHGDW+LJK7KUHVKROG*HQHUDOO\
WKLVLQGLFDWHVDKLJKOHYHORIUHIOHFWLRQVRQWKHQHWZRUNWKHQHWZRUNPD\QRW
EHFRUUHFWO\WHUPLQDWHGLVDFFLGHQWDOO\RSHQRUVKRUWHGWKHUHLVEDGFRQWDFW
LQD%1&FRQQHFWRUHWF7KH/('´1RGH2Q/LQHµLVRIIEHFDXVHWKHUHLV
QRQRGHDWDGGUHVV
Low Threshold Setting
(Highest Sensitivity Level)
High Threshold Setting
(Lowest Sensitivity Level)
TRAFFIC
TRAFFIC
INPUT
INPUT
Low Bat
2XWSXWWR6FRSH
Signal (x1/4 )
GND
Trigger
3RZHU6ZLWFK
'LDJQRVWLF
Low Bat
%DUJUDSK
2XWSXWWR6FRSH
L M H
Signal (x1/4 )
GND
Trigger
Threshold
Node On Line
7
0D[
6
OFF
ON
Push ON
3RZHU6ZLWFK
Green
4
Illegal Framing
3
Poor Signal
Quality
2
Pass/Fail
1
Blinking Red
1RGH)LQGHU
0
7
Buzzer
Threshold
Node On Line
7
0D[
6
5
Slow Edges
4
1RGH)LQGHU
0LQ
Green
1
1
Illegal Framing
3
Poor Signal
Quality
2
Pass/Fail
1
0LQ
Red
Push ON
Ext
Power
5VDC
0.25A
ControlNetTM NetChecker
Allen-Bradley
Allen-
%DUJUDSK
L M H
OFF
ON
Push ON
5
Slow Edges
'LDJQRVWLF
5RFNZHOO
$XWRPDWLRQ
Buzzer
Push ON
Ext
Power
5VDC
0.25A
ControlNetTM NetChecker
Allen-Bradley
Allen-
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Publication 1788-UM001A-US-P - November 1999
18
Checking the Signal Level Using the Bargraph
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TRAFFIC
TRAFFIC
INPUT
INPUT
Low Bat
Low Bat
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Signal (x1/4 )
GND
Trigger
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Signal (x1/4 )
GND
Trigger
Threshold
7
Node On Line
0D[
6
OFF
ON
Push ON
4
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0
Buzzer
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Threshold
Node On Line
7
0D[
6
5
Slow Edges
4
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Illegal Framing
3
Illegal Framing
3
Poor Signal
Quality
2
Poor Signal
Quality
2
Pass/Fail
1
Pass/Fail
1
0LQ
1
2
Push ON
Ext
Power
5VDC
0.25A
ControlNetTM NetChecker
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ey
Allen-
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OFF
ON
Push ON
5
Slow Edges
0
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Bargraph: Global Mode
Publication 1788-UM001A-US-P - November 1999
Buzzer
0LQ
Push ON
Ext
Power
5VDC
0.25A
ControlNetTM NetChecker
Allen-Bradley
Allen-
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Bargraph: Node Level
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Additional Tips
Intermittent Problems
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Continuous Network Monitoring
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Publication 1788-UM001A-US-P - November 1999
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Publication 1788-UM001A-US-P - November 1999
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Appendix
Example Waveforms
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Ideal Transmitted Packet on ControlNet
(as seen at transmitting node)
5 Mbps, Manchester Encoded
Transmit Level: 8.2 Vpp +/-1.3V
+V
0V
-V
Tx Off
t
One Bit Time
200nS
Waveform on Cable
Publication 1788-UM001A-US-P - November 1999
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Example Waveforms
Ideal Received Packet on ControlNet
(as seen at receiving node)
100nS
0 Volt
510mVpp
min.
40nS max jitter
Receive Mask
Typical Waveforms
Good
Signal
Small
Amount of
Reflection
Remote
Station
Publication 1788-UM001A-US-P - November 1999
Example Waveforms
A-3
Example of Waveform Seen When
Network is Improperly Terminated
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IMPORTANT
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Publication 1788-UM001A-US-P - November 1999
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Example Waveforms
Effect of Attenuation on Signal Edges
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Publication 1788-UM001A-US-P - November 1999
Publication 1788-UM001A-US-P - November 1999
PN 957236-84
© 1999 Rockwell International Corporation. Printed in USA.