Sharp JW-21MN manual 16-4, Cause Countermeasure

Page 99

- If the bus cable between the slave station 05(8) and 06(8) is disconnected in the following system.

03(8)	02(8)	01(8)	04(8)	Master	05(8)	06(8)	07(8)
03(8)	02(8)	01(8)	04(8)	station	05(8)	06(8)	07(8)
				B A	C	D
					Disconnection
State of an individual communication flag
D7 6	5	4 3 2	1 D0
OFF		Unstable	OFF

Remove the connector on point A, and turn ON the termination resistance of the master station.

As the communication possible stations 03(8), 02(8), 01(8), and 04(8) are normal, the state of communication monitoring flag is as follows.

D7 6 5 4 3 2 1 D0

OFF ON

Connect the A connector, and	As the one side of the termination
then remove the connector on	resistance is lost, all of the
point B.	communication possible stations 05(8),
	06(8), and 07(8) are abnormal, and the
	06(8), and 07(8) are abnormal, and the
	station 05(8) is unstable.
	D7 6 5 4 3 2 1 D0

16

Remove the connector on point C and make sure the B connector is not connected. Turn ON the termination resistance of the slave module 05(8).

Connect the C connector and make sure the B connector is not connected, and remove the connector at the next point to the point D.

Turn OFF the termination resistance of the slave station 05(8), and turn ON the termination resistance of the end station 06(8).

OFF Unstable OFF ON

As the communication possible station 05(8) is normal, abnormal points exists ahead of the point C.

D7 6 5	4 3 2	1 D0
OFF ON	OFF	ON

As the one side of the termination resistance is lost, the station 05(8) and 06(8) become communication possible stations, but the station 05(8) is unstable and the station 06(8) is turned to OFF, so the abnormal states occur between the point C and the point D.

D7 6 5 4 3 2 1 D0

OFF Unstable OFF ON

Cause	Countermeasure
Disconnection in the bus cable and the	Remove both the bus cable and
branch cable between the station 05(8) and	the branch cable connectors. After
06(8), or contact failure of the connectors	that, shorten one of these
	connectors and check conductivity
	using a tester.

Error on the slave station 06(8)	Exchange the slave module.

16-4

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Contents JW-21MN JW-21MN Safety Precautions InstallationWiring Compel Use Maintenance ProhibitME-NET Module JW-21MN Table of contents Setting of Switches and Parameter 11-1 to Errors and Countermeasures 12-1 toDescription for Computer Link Operation 10-1 to Support Tools 14-1 to Specifications 15-1 to 13-1Appendix 16-1 to Features and Functions Data link functionComputer link function Wiring InstallationConnector Allocation of relay number MaintenanceTreatment Static electricityJW20H JW-21MN JW-21MN JW30H System ConfigurationFront view Name and Function of Each PartInstallation Installation procedureRemarks Name Model Maker Processing of CablesProcessing cable end Fine adjustment of blade cutting depth Cutting of coating, external conductor, and insulatorRemoval of coating, external conductor, and insulator Processing of cable end Display of blade settingCrimping contact Connector crimping procedureConnector ME-GP-01 Processing procedure Insert a sleeve Required tools Hand-held crimping toolFixing the connector Insulation testConductivity test Wiring Method Cable trunk and branch linesRelaying of trunk cables Cable wiring procedure in control panel Page Remarks Waterproof and insulation processing of connectorsBranch connector Straight connectorCheck after wiring Wiring of cables at outside control panelsStation number of the additional station Branching methodReason Memory Address on the ME-NET Memory address for data linksMemory address map against JW20/JW20H JW30H address ME-NET address Memory address map against JW30HJW20/20H ME-NET address Capacity Memory addresses for computer linksJW30H address ME-NET address Capacity Remarks Relay link Description for Data Link OperationCommunication method Data link Standard functionSetting item Set location Data link Save memory functionRegister link Required transmission time Required transmission time and communication delay timeCommunication delay time An example of synchronized transfer by OUT instruction Data transmission between master PC and slave PCMultiple installation of the JW-21MN Expansion of networkCase of mounting 4 sets of JW-21MN Hierarchical link Computer link function Basic commandsOptional commands Description for Computer Link Operation10-2 Basic commandsOptional commands 10-3Communication format, basic pattern 10-4 Write mode assignment None Communication formatRead free memory size Monitor TMR, CNT, and MDReading PC mode Setting PC mode10-5 Reading system memory Writing system memory10-6 10-7 Setting dateWrite mode assignment 1 or Communication format Reading dateSetting time Reading time10-8 Correct clock time Monitor step status JW20/JW20H only10-9 10-10 Write mode assignmentRead the optional parameters Set the optional parametersRead the special I/O parameters Set the special I/O parameters10-11 Release the secret function, register password JW30H only Set the secret function JW30H only10-12 10-13 Check the secret function JW30H only10-14 Response on errorSetting of Switches and Parameter Operation procedure11-1 11-2 Switch setting of master station and slave stationMode switch Mode Module No. switch Unit noReference Need for the termination resistance Station number switch STA noTermination resistance switch LT 11-311-4 Shield ground switch LGSetting contents of master station parameters Value H 11-611-7 Parameter for setting in master stationParameter for setting in slave station Communication area map11-8 11-9 + ｈExample for setting 11-10Maser station Slave station Standard Save memory 11-11 When master station PC is JW20/JW20H11-12 When master station PC is JW30H11-13 Setting procedure11-14 Example Stop operation of data link HEX hexadecimal, byteStop operation of data link HEX hexadecimal, byte Data link function setting HEX hexadecimal, byte Set number of connecting stations DCM decimal, byte11-15 Set top address of register link area on the master station 11-16Set in parameter addresses 005000 to 11-1711-18 Set connection status of slave station Bit pattern, byte 11-1911-20 PC operation 11-21Setting item Contents11-22 11-23 Setting range of flag areaWhen PC is JW20/JW20H When PC is JW30H11-24 11-25 Turn on the power of slave station PC Connect support tools11-26 11-27 11-28 Details Measure Errors and CountermeasuresIndication lamps 12-1Remark FlagOperation condition monitor flag Case of a master station12-3 Communication monitor flag12-4 Case of slave station 01 to12-5 Monitor operation condition by each station PC12-6 Storage of error code12-7 System memory #170 to 177 option module error codeSystem memory #160 to 167 self diagnosis error code System memory #150 monitor error switch number12-8 Error history13-1 Replacement of the JW-21MNSupport Tools Record and load by ladder software JW-92SP, JW-50SP Record14-1 Stop operation of the JW-21MN Load14-2 Load to the personal computerSpecification SpecificationsGeneral specifications Communication specifications15-2 Data link specificationsStandard function Specifications Save memory function SpecificationsComputer link specifications Outside dimensional drawings15-3 Maintenance and check Appendix16-1 Recovery method at communication errors Check flow chart16-2 16-3 Check cable/connectorCause Countermeasure 16-4007764 to 16-5Other cases Switches required check in the JW-21MNCheck items of cables and connectors 16-616-7 Check the errors timingIdentify the error station When identification of the cause is difficultTable of parameter memory 16-8Master station 16-9 Set contents Setting method value, example16-10 16-11 Slave station 01 to 16-12Support tool Opposite module Connection module Special functions unique to the JW-21MN16-13 Remote programming and remote monitorOperation example 16-14Function Standard network connection Expansion network connection16-15 Network settingParameter setting by remote function When used with a computer link16-16 Alphabetical Index Operation procedure Waterproof and insulation processing of connectors