ABB MRP31.0 User manual

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MANUAL
MRP31.0 Modbus RTU
communication module
Universal Motor Controller UMC100.3

2UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL
Description
The MRP31.0 device allows the connection of the Universal Motor Controller UMC100.3 to a Modbus RTU network.
Target group
This manual is intended for the use of specialists in electrical installation and control and automation engineering, who are
familiar with the applicable national standards.
Safety requirements
The responsible staff must ensure that the application or use of the products described satisfy all the requirements for
safety, including all the relevant laws, regulations, guidelines and standards.
Using this manual
Symbols
This manual contains symbols to point the reader to important information, potential risks and precautionary
information. The following symbols are used:
Sign to indicate a potentially dangerous situation that can cause damage to the
connected devices or the environment.
Sign to indicate important information and conditions.
Sign to indicate a potentially dangerous situation that can cause human injuries.
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Terms and abbreviations
 

 Universal Motor Controller
RTU 
transmission mode
LED (Light Emitting Diodes)
 Modbus TCP communication interface
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Related documents
Technical documentation Document no.
 

 
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Document history
  Initial release
  Revision A
 New template
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Important notice

4 Overview
5 Installation
11 Diagnosis
15 Technical data
16 Dimensional drawings
17 Ordering data
3UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL
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Table of contents

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Overview

RS485 Standard







(data low).
Ground wire and cable shield should be connected to prevent common mode voltage between the network devices from

prevent signal reflection.
The MRP31.0 Modbus Interface
The MRP31.0 Modbus communication interface is an optional device for the UMC100.3 which enables the connection of the

• 
Parity and frame length are automatically detected
• MRP31.0 supports the RTU transmission mode only
• 
time.
Through the interface you can:
• 
• Read status information and actual process values from the UMC100.3
• Read device diagnosis information
MRP31
X3:
Modbus
connection
Status Indication
LEDs
X3: Modbus connection
X1: Communication
to UMC100.3

supply connection
Top View Side View
4UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL

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Installation
Mechanical installation
The Modbus interface module MRP31.0 can be mounted either on the UMC100.3 itself or separately from the UMC100.3 using
the single mounting kit (SMK3.0).
Mounting the MRP31.0 on the UMC100.3
When the module is installed directly on the UMC100.3 the UMC100.3 with MRP31.0 acts like a device with integrated
Modbus RTU communication. No additional accessories are needed.
Power
MRP31 Move down MRP31 until

on UMC100.3
Mounting the MRP31.0 remote from the UMC100.3




—
01 Image shows UMC100.3 DC.
5UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL

Mounting and dismounting

Mounting Dismounting
—

Mounting the MRP31.0 on the single mounting kit
Step 1:
Plug in the communication and
power supply connectors.
Step 3:
Move down the MRP31.0 until
snapped in
Step 2:
Move down the MRP31.0
Snap-in
Snapped
Move down
Step 4:

6UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL

MRP31
Demounting the MRP31.0


screw driver and move the
MRP31.0 upwards to loosen

7UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL

Electrical installation
Modbus Connection
Connect Modbus to X3.
General
Arrange the communication cables as far away from the motor cables as possible. Avoid parallel runs. Use bushings at cable
entries.
—
Connector X3
PIN Description
 

GND. Isolated signal ground
Data A (inverting)
 
Bus termination

equipped with internal bus termination

devices located at bus ends.
Communication settings

communication / Modbus RTU) and are copied then automatically to the MRP31.0. After changing communication settings
perform a power cycle.
Master supervision

busfault reaction.
Modbus bus timeout
 
Default 0 ms (deactivated)

Supported baudrates

Modbus data frame
•  
•  
•  
•  
Slave address
 

bus address.

8UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL

Number of nodes in a Modbus network

Network length

bus stub lines should be avoided. To bridge long distances between the Modbus master and the slaves (e.g. between the
control room and the motor control center) it is recommended to use fiber optic converters.
Modbus TCP

Modbus line with MRP31.0 directly connected to UMC100.3 in a drawout system
The following figure shows a simplified diagram on how to connect the UMC100.3 to a Modbus network. Required grounding
of the Modbus cable is not shown in this figure.
Ground wire and cable shield should be connected to prevent common mode voltage between the network
devices from drifting outside the allowable limits.
LT
UMC100.3 and MRP31.0
mounted in drawer
Termination active
Termination active

Network
Length
Modbus Cable
Modbus Cable
9UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL

Modbus line with MRP31.0 mounted outside a drawer using single mounting kit (SMK3.0)
The following figure shows a simplified diagram on how to connect the UMC100.3 to a Modbus network if the UMC100.3 is
inside a drawer and the Modbus communication interface is mounted outside the drawer e.g. in the cable compartment. In
drawout systems this solution has several benefits:
• Modbus address is stored in the Modbus communication interface in addition to the UMC100.3. In case of a drawer re

• Swapping of drawers detected if "Address Check" in UMC100.3 enabled. I.e. it is not possible to accidentally start the
wrong motor because of swapped drawer.
Required grounding of the Modbus cable is not shown in this figure.
LT55
X1
(2b)
(1)
(3)
(4)
max. 3m
(2a)

Network
Length
Termination active
(1) 24V DC supply for the
MRP31.0 communication
interface. This lets the
MRP31.0 stay active even
in case the drawer is
withdrawn.
(2a) Ready made
connection cable from
SMK3.0 X1 to backside of
drawer.
(2b) Ready made
connection cable from
inside drawer to
UMC100.3 X1
(3) UMC100.3
mounted inside a drawer
(4) Modbus
communication adapter
with single mounting kit
(SMK3.0).
Termination active
Modbus Cable
10 UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL