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App-3
M-4662
Appendix
1
2
3
4
5
6
7
App
Index
DataDropoutWhileOperatingasaModbusMaster
If the MV tries to issue a command to a slave device but has not finished receiving
a response to the previous command, the MV will not be able to transmit the next
command. This will cause a data dropout. Take appropriate measures to prevent
dropouts by referring to the following figures.
Read cycle
Data dropout
(slaves 2 and 3)
Data dropout
(slave 3)
Slave device 1
Slave device 2
Slave device 3
G
G
G
Read cycle
(Retry)
: Status lamp
: Response from the slave device
: Command from the MV
Data dropout
(slaves 2 and 3)
Data dropout
(slaves 2 and 3)
Disconnect slave 2
Slave device 1
Slave device 2
Slave device 3
Read cycle
Timeout value
Data dropout
(slaves 2 and 3)
Slave device 1
Slave device 2
Slave device 3
G
G
G
G
Y
Timeout value
G
Y
Timeout value
R
1. When the response from the slave device takes a long time
2. When there is no response from the slave device
3. When the slave device that is not responding is disconnected (retry count set to 1)
G
G
G
G
G
G
G
G
G
G
G
G
G
Y
R
Appendix 2 Data Dropout during Modbus Communication
- RD-MV1000/RD-MV2000 1
- Communication Interface 1
- Foreword 2
- Trademarks 2
- Revisions 2
- HowtoUseThisManual 3
- CommunicationPorts 4
- Contents 5
- 1.1 EthernetInterface 7
- FTPServer 8
- FTPClient 8
- InstrumentInformationServer 9
- WebServer 10
- E-mailTransmission 11
- SNTPServer/Client 12
- DHCPClient 12
- OtherFeatures 12
- 1.2 SerialInterface 13
- 1.3 ModbusProtocol 14
- UsingtheEthernetInterface 15
- 2.2 ConnectingtheMV 16
- ClearingNetworkInformation 20
- SettingtheKeepaliveFeature 21
- 2.3 SendingE-mailMessages 22
- E-mailTest 25
- E-mailFormat 26
- ScheduledE-mailFormat 27
- • Subject 27
- TestE-mailFormat 30
- ConguringtheWebServer 31
- ConfiguringtheMonitorPage 32
- ConfiguringtheOperatorPage 32
- SettingtheURL 33
- • MonitorPageContents 33
- • OperatorPageContents 36
- Displays the alarm summary 36
- ConguringtheFTPServer 37
- AccessingtheMVfromaPC 37
- ConguringtheFTPClient 39
- TestingtheFTPTransfer 41
- 2.7 SynchronizingtheTime 42
- ConguringtheSNTPServer 43
- ConguringtheModbusServer 44
- MV via Modbus 45
- ExamplesofEnteringCommands 47
- • Communication Conditions 49
- • CommunicationStatus 49
- ResumingCommandTransmission 50
- DataDropout 50
- Settings 52
- Operation 54
- PortNumber 55
- SettingTransmissionCommands 56
- 3.2 ConnectingtheMV 60
- Handshaking 61
- • OFF-OFF 61
- • XON-XON 62
- • XON-RS 62
- • CS-RS 62
- Connection 63
- ConnectingtoaHostDevice 63
- • Four-WireSystem 64
- • Two-WireSystem 64
- CAUTION 65
- ExampleofEnteringCommands 69
- ConfiguringtheModbusSlave 72
- 4.1 CommandSyntax 74
- Response 75
- 4.2 AListofCommands 76
- 4.2AListofCommands 77
- BasicSettingCommands 78
- OutputCommands 79
- 4.2 A List of Commands 80
- 4.3 SetupParameters 81
- ChannelNumberNotations 82
- 4.4 SettingCommands 83
- (Setting) 83
- SA Setsanalarm 85
- SZ Setsazone 87
- ST Setsatag 87
- SX Setsagroup 87
- SL Setsatripline 87
- TU Setsaneventaction 91
- Setsabatchtextfield 93
- BD Setsanalarmdelay 93
- SM Setsthecustommenu 93
- Tosetasubmenu 94
- SY Setsthe4paneldisplay 95
- TY Setsthefileformat 96
- 4.5 SettingCommands 97
- (Control) 97
- Commands 100
- 4.6 BasicSettingCommands 101
- XJ SetsanRJC 102
- WU Setsenvironmentsettings 102
- XM Setsthememorysample 104
- RN Setsbasicloginsettings 104
- RM Setsareportchannel 105
- XG Setsthetimezone 105
- WW SetstheWebhomepage 107
- Tosendsystemnotifications 108
- 4.6BasicSettingCommands 108
- YM SetsaModbusmaster 110
- 4.8 OutputCommands 113
- (Setting/Measured/ 113
- ComputedDataOutput) 113
- FF TransmitsFIFOdata 114
- FU Transmitstheuserlevel 114
- PathNameSpecifications 115
- ESCO Opensaninstrument 116
- ESCC Closesaninstrument 116
- I Transmits instrument 116
- 4.11 Maintenance/Test 117
- Commands(availablewhen 117
- Ethernetinterface) 117
- Disconnectstheconnection 118
- 5.1 ResponseSyntax 119
- TextOutput 120
- BinaryOutput 120
- DataSum 121
- CalculatingtheSumValue 122
- SampleFunction 122
- RS-422/RS-485Responses 123
- 5.2 TextDataOutputFormat 124
- • Example 125
- Syntax 125
- Example 125
- • Syntax 127
- • Example1 127
- CommunicationLog 128
- FTPClientLog 129
- OperationErrorLog 130
- LoginLog 130
- WebOperationLog 131
- E-mailLog 133
- SNTPLog 134
- DHCPLog 135
- ModbusCommunicationLog 137
- AlarmSummary 138
- MessageSummary 139
- StatusInformation 140
- EthernetInformation 141
- File List 141
- CheckDiskResult 142
- User Information 144
- NumberofBlocks 146
- NumberofBytes 146
- • Block Member 147
- SpecialDataValues 147
- Format Details 148
- Block Details 148
- MV1000-01E) 150
- StatusInformation1 152
- StatusInformation2 152
- StatusInformation3 152
- StatusInformation4 153
- StatusInformation5to8 153
- BasicSpecications 154
- RS-232Specications 155
- RS-422/485Specications 155
- ModbusClientFunction 156
- ModbusServerFunction 159
- Register 32002 160
- Computed data of channel 101 160
- Register 32001 160
- ModbusMasterFunction 163
- ModbusSlaveFunction 164
- Lower 4 bits 165
- Communication 166
- Appendix3 LoginProcedure 168
- Internal Memory 170
- Appendix 171
- FIFOBufferOverview 172
- NetworkTerminology 173
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