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Reference MVI56E-MCMR ♦ ControlLogix Platform
User Manual Modbus Communication Module with Reduced Data Block
Page 170 of 225 ProSoft Technology, Inc.
May 13, 2014
6.3.5 Slave Driver
The Slave Driver Mode allows the MVI56E-MCMR module to respond to data
read and write commands issued by a remote Master on the Modbus network.
The following flow chart and associated table describe the flow of data into and
out of the module.
1 The Modbus Slave port driver receives the configuration information from the
Compact Flash Disk. This information configures the backplane exchanges,
user memory Read and Write Data areas, the serial ports, and Modbus Slave
Device characteristics. Additionally, the configuration information contains
parameters that can be used to offset data in the database to addresses
different from those requested in messages received from Master units.
2 A Remote Master Device, such as a Modicon PLC or an HMI application,
issues a read or write command to the module’s Modbus Slave Device
Address. The port driver qualifies the message before accepting it into the
module.
3 After the module accepts the command, the data is immediately transferred
to or from the internal database in the module. If the command is a read
command, the data is read out of the database and a response message is
built. If the command is a write command, the data is written directly into the
database and a response message is built.
4 After the data processing has been completed in Step 3, the response is
issued to the originating Master Device.
5 Counters are available in the General Module Status (page 153) Block that
permit the ladder logic program to determine the level of activity of the Slave
Driver.
Refer to Configuration as a Modbus Slave (page 81) for a list of the parameters
that must be defined for a Slave port.
- MVI56E-MCMR 1
- Your Feedback Please 2
- How to Contact Us 2
- ProSoft Technology 2
- Product Documentation 2
- Important Safety Information 3
- Battery Life Advisory 4
- Contents 5
- 1 Start Here 11
- 1.1 What's New? 12
- 1.2 System Requirements 13
- 1.3 Deployment Checklist 14
- 1.4 Package Contents 16
- 1.5 Setting Jumpers 17
- EVISION of the controller 21
- LOT 0 for the controller 21
- ATA-INT (*Very Important*) 25
- to confirm 29
- ATA-INT (Very Important) 33
- ESSAGE CONFIGURATION TAG 38
- EADDATA and 39
- RITEDATA arrays 39
- PROSOFT CONFIGURATION 48
- UILDER 48
- MODULE icon and right 50
- dialog box 52
- to save 52
- to save your changes 53
- 2.3.1 Overview 55
- 2.3.3 Port Configuration 57
- ES or NO 59
- MDERRPTR 59
- EADDATA array. See 59
- ETRYCOUNT > 0 59
- EADDATA[0], assuming 66
- EADDATA[10] 67
- EADDATA[20] because 16320 68
- EADDATA[30] (bit16480 / 16 = 69
- EADDATA[0] 74
- 2.4.1 Overview 81
- 2.4.3 Slave Configuration 86
- 2.5 Ethernet Configuration 90
- ET UP CONNECTION button 92
- BROWSE DEVICE(S) button to 92
- SSIGN TEMPORARY IP 92
- ONNECT. The Diagnostics menu 94
- 2.7.1 Using CIPconnect 96
- to Connect to the Module 96
- 1756-ENBT. The default path 97
- OWNLOAD to 101
- PATH EDIT 103
- ONSTRUCT 103
- OWNLOAD FROM PC TO DEVICE 106
- OWNLOAD 106
- 3 Verify Communication 107
- 3.1.2 Command Error Codes 110
- 3.1.3 MCM Status Data 114
- 4 Ladder Logic 117
- In This Chapter 123
- 5.1 Ethernet LED Indicators 124
- IAGNOSTICS 126
- EST CONNECTION button to 127
- ONNECT 127
- ELECT FOR PCB 128
- ONNECT button again 128
- IEW MODULE’S WEBPAGE 129
- 5.2.2 The Diagnostics Menu 130
- 5.2.7 Data Analyzer 133
- 5.3.1 Required Hardware 137
- 5.4.2 Troubleshooting 141
- 6 Reference 143
- 6.2 Specifications 145
- 6.3 Functional Overview 148
- VENTTRIGGERP1 for Port 1 or 158
- VENTCMDRESPP1. or 158
- MDCONTROLP1.CMDTRIGGER for 161
- ODBUS PORT 1 COMMANDS or 163
- RROR DELAY 165
- 6.3.4 Master Driver 168
- 6.3.5 Slave Driver 170
- 6.4 Cable Connections 171
- 6.4.3 Ethernet Performance 172
- 6.4.5 RS-422 175
- 6.7.1 Before You Begin 193
- 6.7.2 Overview 193
- MPORT RUNG 194
- MPORT button 195
- THERNET.READ 198
- EADETHERNETMSG tag 199
- THERNET controller tag 199
- THERNET.CONFIG 199
- THERNET.WRITE 200
- RITEETHERNETMSG tag 200
- LOCK.WRITE 202
- RITECLOCKMSG tag 202
- EW MODULE 203
- ELECT MODULE dialog box 204
- 6.8.5 Add the Ladder Logic 207
- Contacting Technical Support 219
- 7.1 Warranty Information 221
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