Modbus Master/Slave Communication Module
MVI69-MCM
The MVI69 Modbus Communication Module allows Rockwell Automation CompactLogix processors to interface easily with other Modbus protocol compatible devices.
Compatible devices include not only Modicon PLCs (which all support the Modbus protocol) but also a wide assortment of end devices. The module acts as an input/output module between the Modbus network and the Rockwell Automation backplane. The data transfer from the processor is asynchronous from the actions on the Modbus network. A 5000-word register space in the module exchanges data between the processor and the Modbus network.
Features and Benefits
The inRAx Modbus Master/Slave Communications module (MVI69-MCM) is designed to allow CompactLogix processors to interface easily with Modbus protocol-compatible devices and hosts.
Many host SCADA packages support the Modbus protocol, while devices commonly supporting the protocol include several PLCs, as well as many other third party devices in the marketplace. (For a partial list of devices that speak Modbus, please visit the ProSoft Tested section of the ProSoft web site).
Applications
- Applications using the Modbus Communication Module can be found in many industrial sectors and in the following applications
- Foreign device data concentrator
- Pipelines and offshore platforms
- Food processing
- Mining
- Pulp and paper
- SCADA communications
- Supports Enron version of Modbus protocol for floating point data transactions.
Functional Specifications
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Type
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Specifications
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Communication parameters (configurable)
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Port 1: Baud Rate: 110 to 38.4K baud RS232
Port 2,3: Baud Rate: 110 to 115K baud RS232, 485, 422 (jumper selectable)
Stop Bits: 1 or 2
Data Size: 5 to 8 bits
Parity: None, Odd, Even
RTS Timing delays: 0 to 65535 ms
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Modbus Modes
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RTU Mode (binary) with CRC-16
ASCII mode with LRC error checking
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Floating Point Data
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Floating point data movement supported, including configurable support for Enron implementation
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Modbus Slave Protocol Specifications
The ports on the MVI69-MCM module can be individually configured to support the slave mode of the Modbus protocol. When in slave mode, the module can accept Modbus commands from a master to read/write data stored in the module's internal registers. This data is easily transferred to the CompactLogix processor's data registers.
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Modbus Slave Driver
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Node Address
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1 to 247 software selectable
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Status Data
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Error codes, counters, and port status available per configured slave port starting at memory register 4400
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Modbus Function Codes
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1: Read Output Status
2: Read Input Status
3: Read Multiple Data Registers
4: Read Input Registers
5: Write Single Bit
6: Write Single Data Register
15: Write Multiple Bits
16: Write Multiple Data Register
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Modbus Master Protocol Specifications
The ports on the MVI69-MCM module can be individually configured as Master ports. When configured in master mode, the MCM module is capable of reading and writing data to remote Modbus devices, enabling the CompactLogix platform to act as a SCADA sub-master, or a device data concentrator.
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Modbus Master Driver
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Command List
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Up to 100 commands per master port, each fully configurable for function, slave address, register to/from addressing and word/bit count
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Status Data
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Error codes available on an individual command basis. In addition, a slave status list is maintained per active Modbus master port
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Polling of Command List
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Configurable polling of command list, including continuous and on change of data
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Modbus Function Codes
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1: Read Output Status
2: Read Input Status
3: Read Multiple Data Registers
4: Read Input Registers
5: Write Single Bit
6: Write Single Data Register
15: Write Multiple Bits
16: Write Multiple Data Register
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Hardware Specifications
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Dimensions
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Standard 1769 Single-slot module
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Current Load
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800 mA max@ 5 VDC (Serial)
Power Supply Distance Rating 2
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Operating Temp.
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0 to 60 Deg C
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32 to 140 Deg F
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Storage Temp.
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-40 to 85 Deg C
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-40 to 185 Deg F
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Relative Humidity
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5 - 95% (w/o condensation)
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LED Indicators
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Power and Module Status
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Application Status
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Serial Port Activity
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Serial Activity and Error Status
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CFG Port
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RJ45 (DB-9M w/ supplied cable)
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RS-232 only
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No hardware handshaking
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App Ports (P1, P2)
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RJ45 (DB-9M w/supplied cable)
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RS-232 handshaking configurable
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500V Optical isolation from backplane
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Shipped with Unit
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RJ45 to DB-9M cables for each port
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6-foot RS-232 configuration Cable
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Ordering Information
| MVI69-MCM |
Modbus Master/Slave Communication Module |
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| To place an order, please contact your local ProSoft Technology, Inc. distributor. For a list of ProSoft distributors near you, click here. |
Distributors:
Place your order by email to orders@prosoft-technology.com:, fax to +1 661-716-5101.
Sales and Support:
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