Allen-Bradley MediaChecker 1788-MCHKR Manual

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Summary of Contents for Allen-Bradley MediaChecker 1788-MCHKR

Page 2: Safety Information
Safety Information The MediaChecker tests for incorrect pairing (split pairs), Important: Identifies information that is critical for miswires, and shorted and open wires on all twisted pair successful application and understanding of cables, as well as shorts on coaxial cables. A stored cable the product.
Page 3 Safety Information ATTENTION: To avoid possible fire, electric shock, personal injury, or damage to the MediaChecker: • Do not connect the MediaChecker to any telephony inputs, systems, or equipment, including ISDN. Doing so is a misapplication of this product, which can result in damage to the instrument and create a potential shock hazard to the user.
Page 4: Getting Acquainted
Getting Acquainted Table 2. Features Getting Acquainted Item Function Display, Switches, and Connections A 2-line by 16-character LCD display. When there is more information than can be displayed on two lines, an up arrow , down arrow , or bidirectional arrow MediaChecker appears in the left side of the display.
Page 5 Getting Acquainted Table 3. Rotary Switch Positions Item Description LENGTH WIRE MAP TEST Turns the MediaChecker off. See “Battery Save Mode” for more information. Tests the attached cable and provides a pass or fail summary based on the parameters specified for the selected cable.
Page 6: Audible Signal (Beeper)
Getting Acquainted Table 4. Connections Item Description Standard 9-pin (DB9) connector for connecting DeviceNet and DH+/RIO cables (using the adapter provided). Standard 8-pin modular jack for connecting unshielded (UTP) and foil-screened (FTP) UTP/FTP COAX unshielded twisted pair cable for Ethernet IEEE 802.3 networks.
Page 7 Getting Acquainted • A continuous, varying-pitch tone indicates the To disable the Battery Save feature, turn the rotary switch to OFF, then press and hold E while turning the rotary MediaChecker is connected to an active cable and should be disconnected immediately. “ACTIVE switch to TEST.
Page 8 Preparing the MediaChecker for Use Preparing the MediaChecker for Use Important: Never run cable tests with more than one cable connected to the MediaChecker. ATTENTION: To reduce wear on the Doing so can cause erroneous results. MediaChecker connector, leave the adapter If you think the MediaChecker is not performing properly, connected to the MediaChecker whenever refer to “When Something Goes Wrong”...
Page 9 Preparing the MediaChecker for Use To set up the MediaChecker for the desired cable, do the Important: You can check the cable selection at any following: time other than when in the setup mode by pressing the E key. Important: The number of steps necessary to select a cable definition depends on the type of The MediaChecker will now test according to the cable network selected.
Page 10 Preparing the MediaChecker for Use Calibrating the MediaChecker to a Cable Important: To ensure accurate measurements, be sure that conductive objects, including fingers, do Cables from different batches or manufacturers can have not touch any of the cable connectors or characteristic variances of up to 20 %, causing deviations conductors during calibration or cable tests.
Page 11 Preparing the MediaChecker for Use Press C D until “YES” appears, and then press Turn the rotary switch to TEST, LENGTH, or WIRE E. The MediaChecker takes a few measurements MAP. on the attached cable and displays the measured Press A; then press E repeatedly until the length.
Page 12 Key to Twisted Pair Displays Table 6. Key to Twisted Pair Displays (cont.) Key to Twisted Pair Displays Table 6 describes the symbols used for DeviceNet, DH+/RIO Phoenix Clip DH+/RIO, and Ethernet displays. Wire Display Color Color Color Table 6. Key to Twisted Pair Displays Line 1 Blue Blue...
Page 13 The Test Function (TEST) The Test Function (TEST) For DeviceNet, DH+/RIO, and Ethernet cables, connect the Cable ID to the far end of the cable, if The TEST function tests the attached cable and indicates desired (refer to Table 7). “PASS”...
Page 14 The Test Function (TEST) Table 7. Failures Detected for Each Cable Type Failures Detected DeviceNet DH+/RIO Ethernet ControlNet Distance to short Distance to open (near end) Length Split pair Wire map 1. Measured for the data pair only. For shorted power wires, the MediaChecker displays the resistance of the short. 2.
Page 15 The Test Function (TEST) Twisted Pair Cable Test Results “--“ means the Cable ID is not detected. If the MediaChecker Important: If you suspect inaccurate length readings, does not detect a properly calibrate the MediaChecker to the cable. See connected Cable ID, the cable aan59f.eps “Calibrating the MediaChecker to a Cable”...
Page 16 The Test Function (TEST) Table 8. DeviceNet Test Results (with Cable ID) Display Failure Description Short across the data pair “SHORT” is blinking. L and H are shorted together at approximately 600' (183 m). Split pair “SPLIT PR” is blinking. In this case, a power wire and a data wire are swapped at the near end and swapped back at the far end.
Page 17 The Test Function (TEST) Table 8. DeviceNet Test Failures (with Cable ID) (cont.) Display Failure Description Short to the shield. “SHORT” is blinking. There is a resistive fault between S and L. It could be a short or a slightly higher resistance. Check the connectors first;...
Page 18 The Test Function (TEST) Table 9. DeviceNet Test Failures (without Cable ID) Display Failure Description The MediaChecker detects a “FAULT” and “350Ω“ are blinking. There is probably very high resistance between the one or more I/O device connected to the cable under data lines and the “-”...
Page 19 The Test Function (TEST) Table 9. DeviceNet Test Failures (without Cable ID) (cont.) Display Failure Description The MediaChecker detects a low “FAULT” and “OPEN” are blinking. resistance between the CAN_H There is a resistive fault between L and H. The and CAN_L (data) wires;...
Page 20 The Test Function (TEST) Table 9. DeviceNet Test Failures (without Cable ID) (cont.) Display Failure Description The MediaChecker measures a “OPEN” is blinking.* The L wire is open at the near end. very short length for the CAN_L To detect an open at the far end, connect the Cable ID wire as compared to the other to the far end and repeat the test or connect the Cable wires.
Page 21 The Test Function (TEST) Coaxial Cable Test Results Important: Coaxial cables must be unterminated for the MediaChecker to display the cable’s length. Important: If you suspect inaccurate length readings, An open in a coaxial cable looks just like an calibrate the MediaChecker to the cable. See unterminated cable.
Page 22 The Test Function (TEST) Table 10. ControlNet Test Failures Display Failure Description The MediaChecker detects a cable length If “2130'“ (650 m) is flashing, the cable is greater than 2130 ft (650 m) , which is the longer than the maximum the maximum it can measure.
Page 23 The Test Function (TEST) 80 Feet MediaChecker 0Ω SHORT 1788-MCHKR SETUP ENTER LENGTH TEST WIRE MAP 70 Feet MediaChecker 0.5Ω SHORT 1788-MCHKR SETUP ENTER LENGTH TEST WIRE MAP aan04f.eps Figure 4. Testing for Shorts (Ethernet Example) 1788-UM002A-US-P – April 2000...
Page 24 Testing the Wire Map (WIRE MAP) Testing the Wire Map (WIRE MAP) Important: If you select the “COAX” cable type while in the WIRE MAP mode, the MediaChecker will Using the MediaChecker’s WIRE MAP function and the perform the LENGTH test on the cable. Cable ID, you can determine the wiring of both the near and far ends of twisted pair cables.
Page 25 Testing the Wire Map (WIRE MAP) When the MediaChecker detects something on the far The following display indicates the near end wiring of a end of the cable, but cannot determine if it is the Cable cable without the Cable ID connected: ID, “ID”...
Page 26 Testing the Wire Map (WIRE MAP) Table 11. DeviceNet Wire Map Failures (with Cable ID) Description Display Failure Miswire (wires “H” and “+” are blinking. The first line on the display (LH +- S) shows the are swapped) near end connections. The second line (L+ H- S) shows far end connections.
Page 27 Measuring Cable Length (LENGTH) Measuring Cable Length (LENGTH) Before a length measurement is made, the MediaChecker performs diagnostic tests to prevent any cable failures Important: If you suspect inaccurate length readings, from corrupting the length measurement. All failures are calibrate the MediaChecker to the cable. See described in the earlier sections “The TEST Function”...
Page 28 Measuring Cable Length (LENGTH) Press E to check the cable selection. For a DeviceNet cable with no failures, the display shows the following: The MediaChecker displays the cable selection for a few seconds and then starts the test. If the cable selection is not correct, refer to “Preparing the MediaChecker for Use”...
Page 29 Calculating Trunk, Drop, or Tap Lengths Calculating Trunk, Drop, or Tap Lengths This section shows how to calculate the length of just the trunk or the total length of just the drops or taps. When you test a cable that has drops or taps, the MediaChecker reports the length of the trunk, plus the total length of all the drops or taps on the trunk.
Page 30 Calculating Trunk, Drop, or Tap Lengths ControlNet Length Calculations Measured tap lengths depend on whether the taps are terminated or not. See Table 12. Formulas: • Trunk length = Measured length – Total measured length of taps • Total tap length = Measured length – Trunk length Example 1: Calculating trunk length A cable measures 750 ft long and has 16 unterminated taps.
Page 31 Calculating Trunk, Drop, or Tap Lengths Table 12. Measured Tap Lengths for ControlNet Number Cables of Taps Terminated Tap* Unterminated Tap 140 ft (43 m) 77 ft (23.5 m) Number of Taps Terminated Tap* Unterminated Tap 148 ft (45 m) 82 ft (25 m) 8 ft (2.5 m) 4 ft (1.5 m)
Page 32 Calculating the Distance to a Short Table 12. Measured Tap Lengths for ControlNet Calculating the Distance to a Short Cables (cont.) Depending on the type of short on a cable, the Number MediaChecker may or may not be able to determine the of Taps Terminated Tap* Unterminated Tap...
Page 33 Calculating the Distance to a Short Short across the shield and any other wire: The Distance to short = MediaChecker reports the short, but cannot measure its R1 + R2 resistance or determine the distance to the short. You can Rs: Resistance of the short, as measured by the use an ohmmeter to measure the resistance;...
Page 34 Calculating the Distance to a Short Table 13. DeviceNet and DH+/RIO Cable Resistances Table 14. ControlNet Cable Resistances Cable Type Center Shield Data Pair Power Pair Cable Type (H, L) (+,-) Shield Conductor 0.028 Ω/ft 0.0036 Ω/ft 0.0069 Ω/ft 0.0032 Ω/ft 0.00175 Ω/ft DeviceNet ControlNet RG6...
Page 35: Setup Selections
Setup Selections Setup Selections Setup selections that rarely need changing are under a special “Power-up” menu. From the Power-up menu, you In setup mode you can select cable characteristics and can do the following: customize the MediaChecker’s operation. Once changed, •...
Page 36: Maintenance
Maintenance Maintenance General Periodically wipe the case with a damp cloth and detergent; do not use abrasives or solvents. Clean and dry as required. If the MediaChecker will remain unused for an extended period, remove the batteries to prevent damage from leakage. Replacing Batteries Two 1.5 V AA alkaline batteries power the MediaChecker and typically provide 50 hours of operation.
Page 37 Maintenance Table 15. Troubleshooting the MediaChecker Symptom 1: Display goes blank. Action Result Explanation 1. Turn the rotary switch to OFF, wait 5 seconds and turn Display is active The Battery Save feature turned the MediaChecker the switch to TEST. off.* Display still blank Go to step 2.
Page 38: Performing A Self-Test
Maintenance Performing a Self-Test Important: To exit without performing a self-test, either press A, or ensure that the second line is When the MediaChecker is on, it periodically tests some displaying “NO” and press E to move to of its internal circuits. If a problem is detected, the the next setup selection.
Page 39 Maintenance • Returning the MediaChecker for Repair To run a self-test on Ethernet functions, connect an Ethernet patch cord to the RJ45-to-DB9 If after performing the previous tests you believe the adapter. Use this series combination to connect MediaChecker is not performing properly, send the from the DB9 connector on the Cable ID to the complete kit to a local Rockwell Automation location for RJ45 connector on the MediaChecker.
Page 40: Parts And Accessories
Maintenance Parts and Accessories Table 16. Parts and Accessories Description Part No. RA (Resistive Adapter) cable identifier with female DB9 connector 97157801 Users manual (multi-language) 957259-13 Quick reference card 957259-93 1788-MCHKR Accessory Kit 1788-MCHKRACC • 1 RJ-45F to DB9 male adapter •...
Page 41: Specifications
Specifications Specifications ATTENTION: Never connect the MediaChecker to any telephony inputs, These specifications assume the MediaChecker was systems, or equipment, including ISDN. calibrated using 100 ft (30 m) (or more) of cable of the same type and batch as the cable being measured. Accuracy is specified for two years after calibration.
Page 42 Specifications Table 18. ControlNet Cable Test Specifications Cable Length Distance to Short Cable Accuracy Resolution Accuracy Resolution Range ControlNet RG-6 1 m to 650 m 10 % + 10 m 10 % + 1 m (6 ft) 1 m (5 ft) 0.5 m (1 ft) ControlNet RG-6F (high flex RG-6) (2 ft to 2130 ft)
Page 43 Specifications Table 20. DH+/RIO Cable Test Specifications Cable Length Distance to Short Cable Range Accuracy Resolution Accuracy Resolution DH+/RIO 1770-CD 1 m to 350 m 7 % + 3 m 7 % + 2 m (6 ft) See Note 2 0.5 m (1 ft) DH+/RIO 9022 (2 ft to 999 ft)
Page 44: Warranty
Specifications Power Electromagnetic Compatibility Meets FCC part 15-b Two AA size 1.5 V alkaline batteries Meets EN 50081-1: 1993, EN 50082-1; 1995 Battery type: ANSI/NEDA-15A or IEC-LR6 Meets AS/NZS 2064 Low battery indicated on the display N223 Typical battery life: 50 hours Timed power-off function (Battery Save feature) Safety Dimensions...