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Modbus Router/B
A-MBR/B
The Modbus® Router/B provides intelligent data routing between Logix controllers/PLCs and Modbus devices via Modbus RTU (RS232 / RS485) or Modbus TCP. The Router can operate as either a Modbus Client (Scheduled Mode) or Modbus Server (Reactive Mode).
Communications with a Logix controller (e.g., ControlLogix® or CompactLogix™) can be achieved via EtherNet/IP™ or USB. Direct-to-Tag technology enables the router to exchange data directly with Logix Tags, thus requiring no Logix programming.
When using USB, a redundant system can be configured using one Router for each Logix controller. Only the Router connected to the Primary Logix controller will respond to the Modbus TCP requests.The Router also supports the MicroLogix™ and SLC™500 platforms.
The Router hosts two Ethernet ports which can be configured in a Device Level Ring or Linear topology.
Architectures
Click on image(s) to enlarge
Features and Benefits
- The MBR/B can operate as a Modbus Client or Modbus Server.
- Modbus Client mode can communicate with up to 100 Modbus Servers.
- Supports Modbus passthrough messaging.
- Modbus Server mode supports full Modbus data range.
- Modbus Server mode supports emulating multiple Modbus nodes.
- Configurable Modbus TCP Port numbers.
- Supports EtherNet/IP Target and Originator modes:
- EtherNet/IP Target (Class 1 connection)
- EtherNet/IP Originator (Class 1 connection with up to 10 EtherNet/IP devices and Explicit Messaging, including Direct-To-Tag Logix tag access, with up to 10 EtherNet/IP devices)
- Supports CIP USB interface for Logix controllers.
- EtherNet/IP Class 1 target connections support 2kbyte input and 2kbyte output data to Logix input and output assemblies.
- Supports Modbus media conversion allowing for a transparent link from one media to another (e.g., Modbus TCP to Modbus RTU232).
- Slate provides a Modbus packet capture utility for better diagnosis.
- Dual Ethernet ports which support Device-Level-Ring (DLR).
- Network Time Protocol (NTP) supported for external time synchronization.
- Small form factor – DIN rail mounted.
Specifications
Ethernet
Specification
Description
Connector
RJ45
Conductors
CAT5 STP/UTP
ARP Connections
200 max.
TCP Connections
200 max.
CIP Connections
20 max.
Communication Rate
10/100 Mbps
Duplex Mode
Full / Half
Auto-MDIX
Supported
Controller Support
ControlLogix, CompactLogix, MicroLogix, SLC
Embedded Switch
Yes, 2 x Ethernet ports
Device Level Ring (DLR)
Supported
Network Time Protocol (NTP)
Supported
Serial Ports (RS232, RS485)
Specification
Rating
Connector
9-way terminal (shared)
Conductor
24 to 18 AWG
Electrical Isolation (RS232)
1000 VDC
Electrical Isolation (RS485)
1500 Vrms (1 minute)
Baud Rate (bps)
1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Parity
None, Even, Odd
Data, Stop Bits
8, 1
USB Port
Specification
Description
USB Supported
USB2.0
Module USB Connector
Type-A
Recommended USB Cable
Type-A (male) to Type-B (male)
Modbus – Reactive / Scheduled Mode
Specification
Rating
Reactive Tag mode
Max 100 mapping items
Scheduled Tag mode
Max 100 mapping items
Application Functions
SupportedRead Coil, Read Discrete Input, Read Holding Register, Read Input Register,
Write Coil, Write RegisterMaximum Logix Controller
support3 (when using Ethernet)
1 (when using USB)
Protocols
Modbus RTU (RS232 or RS485), Modbus TCP
Modbus Client - Enhanced Mode
Specification
Description
Modes Supported
Modbus TCP, Modbus RTU232, Modbus RTU485
Modbus RTU485 Termination
125 Ω - Software Enabled
Modbus Server Devices
100 max.
Modbus Mappings
100 max.
Mapping Ranges
Holding Register: 0 to 65535
Input Register: 0 to 65535
Input Status: 0 to 65535
Coil Status: 0 to 65535Base Offset
Modbus (base 0), PLC (base 1)
Configurable Modbus TCP Port
Yes
Data Re-formatting Supported
BB AA
BB AA DD CC
CC DD AA BB
DD CC BB AAModbus Server - Enhanced Mode
Specification
Description
Modes Supported
Modbus TCP, Modbus RTU232, Modbus RTU485 (simultaneous)
Modbus RTU485 Termination
Software set
Mapping Ranges
Holding Register: 0 to 65535
Input Register: 0 to 65535
Input Status: 0 to 65535
Coil Status: 0 to 65535Base Offset
Modbus (base 0), PLC (base 1)
Configurable Modbus TCP Port
Yes
EtherNet/IP Target
Specification
Description
Class 1 Cyclic connection count
5
Logix Direct-to-Tag Supported
Yes
EtherNet/IP Originator
Specification
Description
Class 1 Cyclic Connections Supported
Yes
Class 3 / UCMM Connections Supported
Yes
Class 1 Connection Count
10
Class 3 / UCMM Target Device Count
10
Class 3 / UCMM Mapping Count
50
Hardware
Specification
Description
Power Supply
Input: 10 to 32 VDC, (121 mA @ 24 VDC)
Voltage Fluctuations
Voltage fluctuations < ±10%
Transient Over-voltages up to the levels of OVERVOLTAGE CATEGORY 1Power Consumption
3.1 W (Including full load on USB of 200mA), 300 mA maximum
USB Power
5V, maximum load of 200 mA (1W)
Dimensions (H x W x D)
149.0 x 34.0 x 116.0 mm
Connector
3-way terminal
Conductors
24 to 18 AWG
Enclosure Rating
IP20, NEMA/UL Open Type
Indoor use onlyTemperature
-20 to 70 °C
Relative Humidity
5% to 90% - No condensation
Pollution Degree
2
Altitude
< 2000 m
Earth Connection
Yes, terminal based
Emissions
IEC 61000-6-4
ESD Immunity
EN 61000-4-2
Radiated RF Immunity
IEC 61000-4-3
EFT/B Immunity
EFT: IEC 61000-4-4
Surge Immunity
Surge: IEC 61000-4-5
Conducted RF Immunity
IEC 61000-4-6
Certifications
ODVA Certification 37.47 kB Last Modified 01/25/2024 UL/cUL; Class1, Div 2 238.99 kB Last Modified 01/25/2024 CE Declaration of Conformity (CE, UKCA, RoHS, UL) 924.07 kB Last Modified 07/18/2025