ABB M101 User manual

—
DISTRIBUTION SOLUTIONS
MNS® Digital
with M10x
Interface Manual Modbus

NOTICE Thisdocument contains information about oneor more ABB products and may include a description of or a
reference to one or more standards that may be generally relevant to the ABB products. The presence of any
such description of a standard or referenceto a standard is not a representation that all of the ABB products
referenced in thisdocument support all of the features ofthe described or referenced standard. In orderto
determine the specific features supported by a particular ABB product, the readershould consult the product
specifications for the particular ABB product.
ABB may have one or more patents or pending patent applications protecting the intellectual property in the
ABB products described in this document.
The information in this document is subject to change without notice and should not beconstrued as acom-
mitment by ABB.ABB assumes no responsibility for any errors that may appear in this document.
Products described or referenced in thisdocument aredesigned to be connected and tocommunicate infor-
mation and data through network interfaces, which should be connected to asecurenet-work. It is the sole
responsibility of the system/product owner to provide and continuously ensure a secure connection between
the product and the system network and/or any other networks that may be connected.
The system/product owners must establish and maintain appropriate measures, including, but not limited to,
the installation of firewalls, application of authentication measures, encryption of data, installation of antivirus
programs, and so on, toprotect these products, the network, its system, and interfaces against security
breaches, unauthorized access, interference,intrusion,leakage,and/or theft of data or information.
ABB performs functionality testing on the products and updates that werelease. However, system/product
ownersare ultimately responsible for ensuring that any product updates orother majorsystem updates (to
include but not limited to code changes, configuration file changes, third-party software updates or patches,
hardware change out,and so on) arecompatible with the security measures implemented. The system/ prod-
uct owners must verify that the system and associated products function as expected in the environment in
which they are deployed.
In no event shall ABBbe liable fordirect, indirect, special, incidental or consequential damages ofany nature or
kind arising from the use of this document, nor shall ABB be liable for incidental or consequential damages
arising from use of any software or hardwaredescribed in this document.
This document and parts thereof must not be reproduced or copied without written permission from ABB, and
the contents thereof must not be impartedto a third party nor used for any unauthorized purpose.
The software or hardwaredescribed in this document is furnished under a license and may be used, copied, or
disclosed only in accordance with the terms of such license. This product meets the requirements specified in
EMC Directive 2014/30/EU and in Low Voltage Directive 2014/35/EU.
TRADEMARKS
MNS is a registered or pending trademark of ABB.
Ability is a trademark of ABB.
All rights to copyrights,registeredtrademarks, and trademarks residewith their respectiveowners.
Copyright © 2018 ABB.
All rights reserved.
Release: May 2018
Document Number: 1TGC908004M0201
Revision: M0201

TABLE OF CONTENTS
I
—
Table of Contents
1. General.........................................................................................................................................1
1.1. Target Group.................................................................................................................................1
1.2. Useof Warning, Caution, Information and Tip icon.............................................................1
1.3. Terminology..................................................................................................................................2
1.4. Related Documentation............................................................................................................. 5
2. Introduction ............................................................................................................................... 6
2.1. Hardware Types and Technical Data .......................................................................................7
2.2. Modbus Standard....................................................................................................................... 8
2.2.1. Basics...........................................................................................................................8
3. Interfaces...................................................................................................................................11
3.1. Front View....................................................................................................................................11
3.2. Power Supply..............................................................................................................................12
4. MNS Digital Gateway Installation............................................................................................13
4.1. MNS Digital Gateway Mounting..............................................................................................13
4.2. CF Card Installation...................................................................................................................14
5. Communication Interface Connection....................................................................................15
5.1. Switchgear Bus Network..........................................................................................................15
5.2. Switchgear Control Network...................................................................................................17
5.2.1. Connection Examples of Switchgear Control Network...................................17
5.3. Time Synchronization ...............................................................................................................19
5.3.1. Option 1......................................................................................................................19
5.3.2. Option 2.....................................................................................................................20
5.4. Fieldbus........................................................................................................................................21
5.4.1. Modbus RTU Topology............................................................................................21
5.4.2. Modbus TCP Topology...........................................................................................24
6. Redundancy...............................................................................................................................25
6.1. Redundant Architecture.......................................................................................................... 25
6.2. Redundancy Configuration.....................................................................................................26
6.2.1. RedundantMNS Digital Gateway connection...................................................26
6.2.2. M10x-M Redundant Configuration.......................................................................27
6.2.3. MNS Digital Gateway Redundant Configuration...............................................27
6.3. Handling of redundancy faults ..............................................................................................29
6.4. MView / Web Interface.............................................................................................................30
7. Configurations..........................................................................................................................31
7.1. Initial Values – IP Configuration..............................................................................................31
7.2. Settings – IP Configuration .................................................................................................... 32
7.2.1. Definition of IP Addresses .................................................................................... 33
7.3. Settings – Serial Switchgear Bus...........................................................................................33
7.4. Settings – Modbus RTU Communication ............................................................................ 35
7.5. Settings – Modbus TCP Communication.............................................................................36
7.5.1. Multiple Master in Modbus TCP applications....................................................37
7.6. Failsafe.........................................................................................................................................37
7.7. Start-up of MNS Digital Gateway and application download......................................... 38
7.7.1. Power-On procedure..............................................................................................38
7.7.2. Power On the control voltage supply .................................................................38
7.7.3. Confirm operation..................................................................................................38

TABLE OF CONTENTS
II
8. Function Codes .........................................................................................................................39
8.1. Message Format........................................................................................................................39
8.1.1. Query Messages...................................................................................................... 39
8.1.2. Response Messages............................................................................................... 39
8.2. Function Code 02 – Read Input Status.................................................................................40
8.3. Function Code 03 – Read Holding Registers.......................................................................40
8.4. Function Code 04 – Read Input Registers...........................................................................40
8.5. Data Presentation for Function Code 03 and 04................................................................41
8.6. Function Code 06 – Preset Single Register..........................................................................41
8.7. Function Code 08 – Preset Single Register..........................................................................41
8.8. Function Code 16 – Preset Multiple Register......................................................................42
8.9. Restrictions................................................................................................................................42
8.9.1. General.......................................................................................................................42
8.9.2. Modbus RTU.............................................................................................................42
8.10. Exception Code Handling........................................................................................................43
9. Data Mapping...........................................................................................................................44
9.1. User Data Map...........................................................................................................................44
9.2. Default Data Map......................................................................................................................44
9.2.1. Monitoring (Inputs from M10x-M).......................................................................44
9.2.2. Monitoring with Function Code 02.....................................................................45
9.2.3. Monitoring with Function Code 03 and 04 .......................................................50
9.2.4. Extended Status Description................................................................................51
9.2.5. Control Commands.................................................................................................54
9.2.6. Switching Commands............................................................................................55
9.2.7. Switching Commands – Bit Control.....................................................................56
9.2.8. Redundant MNSDigitalGateway Modbus Data............................................... 57
9.2.9. Control Access.........................................................................................................58
10.Troubleshooting and Maintenance........................................................................................60
10.1. MNS Digital Gateway LED Indication....................................................................................60
10.2. Troubleshooting........................................................................................................................63

LIST OF FIGURES
III
—
List of Figures
Figure 1: MNS Digital Gateway................................................................................................................... 6
Figure 2: MNS Digital System Configuration with M10x...................................................................... 6
Figure 3 Master Slave Query Response Cycle......................................................................................... 8
Figure 4 MNS Digital Gateway front view..............................................................................................11
Figure 5 Power Supply Connector...........................................................................................................12
Figure 6 MNS Digital Gateway Mounting Kit.........................................................................................13
Figure 7 CF Card Insertion.........................................................................................................................14
Figure 8 CF Card Insertion Detail.............................................................................................................14
Figure 9 Hardware connection between MNS Digital Gateway and M10x......................................15
Figure 10 Shielding Clamp for RS485......................................................................................................16
Figure 11 MNS Digital Gateway directly Connected to MNS Digital Edge Gateway......................17
Figure 12 Network connection of MNS Digital Gateway and MNS Digital Edge Gateway...........18
Figure 13 Example,showing3rd party Network Switchand 3rd party NTPServer in a
Switchgear Control Network.....................................................................................................................19
Figure 14 Example, using MNS Digital Gateway as NTP Server........................................................20
Figure 15 MNS Digital Gateway RS232 connection via Serial 2..........................................................21
Figure 16 MNS Digital Gateway RS422 connection via Serial 2..........................................................22
Figure 17 MNS Digital Gateway RS485 connection via Serial 2......................................................... 23
Figure 18 Example for RS485 bus termination and biasing:............................................................. 23
Figure 19 MNS Digital Gateway Modbus TCP connection with Crossover cable..........................24
Figure 20 MNS Digital Gateway Modbus TCP connection with standard CAT5 cable................24
Figure 21 Redundancy configuration and possible failure scenario...............................................25
Figure 22 Serial 1 to serial 1 redundant link connections with ferrite core....................................26
Figure 23 MNavigate IPaddress Parameterization for Primary and BackupMNS Digital
Gateway.........................................................................................................................................................27
Figure 24MNavigate Fieldbus Slave address Parameterization for Primary and BackupMNS
DigitalGateway...........................................................................................................................................28
Figure 25 MView Redirecting to Redundant MNS Digital Gateway.................................................30
Figure 26 Redundancy error shown in MView by a red square.........................................................30
Figure 27 IP Address Settings.................................................................................................................. 32
Figure 28 Time Sync Settings .................................................................................................................. 32
Figure 29 Parameter Window for Serial Switchgear Bus in MNavigate..........................................34
Figure 30 Parameter Window for MODBUS RTU parameters in MNavigate.................................36
Figure 31 Parameter Window for MODBUS TCP parameters in MNavigate...................................37

LIST OF TABLES
V
—
List of Tables
Table 1 MNS Digital Gateway Modbus Hardware...................................................................................7
Table 2 MNS Digital Gateway Technical Data..........................................................................................7
Table 3 Modbus RTU mode of Transmission.........................................................................................10
Table 4 Front View Connectors, LED and Push Buttons.....................................................................12
Table 5 M10x Communication setting ....................................................................................................15
Table 6 Serial Redundant Link Cable ordering code...........................................................................26
Table 7 M10x-M redundant communication setting............................................................................27
Table 8 Primary and Backup IP address setting..................................................................................28
Table 9 Primary and Backup IP address setting.................................................................................. 29
Table 10 MNS Digital Gateway Default Parameters – IP Configuration.......................................... 32
Table 11 MNS Digital Gateway Serial Switchgear Bus.........................................................................34
Table 12 MNS Digital Gateway Default Parameters – Modbus RTU configuration...................... 35
Table 13 MNS Digital Gateway Default Parameters – Modbus RTU configuration......................36
Table 14 Function Codes...........................................................................................................................39
Table 15 Address ranges of Function Codes ........................................................................................40
Table 16 Byte representation for function code 03 and 04................................................................41
Table 17 Byte representation for Float....................................................................................................41
Table 18 Byte representation for FloatBig Endian ..............................................................................41
Table 19 Default Modbus Map Life Bit of M10x-M...............................................................................45
Table 20 Default Modbus Map Bit Status of M10x-M.........................................................................49
Table 21 Default Modbus Map Measured Values of M10x-M.............................................................50
Table 22 Default Modbus Map Extended Status for M10x-M.............................................................51
Table 23 Extended Status Byte 1..............................................................................................................51
Table 24 Extended Status Byte 2............................................................................................................. 52
Table 25 Extended Status Byte 3............................................................................................................. 52
Table 26 Extended Status Byte 4 ............................................................................................................53
Table 27 Default Modbus Command Registers....................................................................................54
Table 28 Switching Commands sent from DCS to MNS Digital Gateway......................................55
Table 29 Default Modbus Bit Command Registers.............................................................................56
Table 30 Default Bit Map Control Commands Low Byte....................................................................56
Table 31 Default Bit Map Control Commands High Byte................................................................... 57
Table 32 Redundant data for monitoring by the Modbus master................................................... 57
Table 33 Redundant Command possible from the Modbus Master................................................ 57
Table 34 Command and Status for Control Access.............................................................................58
Table 35 MNS Digital Gateway LED indication.....................................................................................62
Table 36 MNS Digital Gateway Troubleshooting.................................................................................64

GENERAL TARGET GROUP
1TGC908004M0201 1
—
1. General
1.1. Target Group
Thisdocument describes communication and control interfacesusedinMNS Digital andMNS
DigitalUpgrade(upgradefrom INSUM 1 / 2) projects utilizing ABBmotorcontrollerM10x
[M101 / M102].
Themanual is primarily intendedfor thoserequiring informationon howto access infor-
mation and data provided from MNS Digital Gateway.
Furthermorethe document provides information for control system and application engi-
neers how to integrateMNS Digital [Upgrade] as Fieldbus component into PLC or higher level
Process Control Systems.
It isassumed thatthe reader of this manual is familiar with basictermsof Fieldbus andcon-
trol communication (e.g.basicknowledge about Modbus etc.).
1.2. Use of Warning, Caution, Information and Tip
icon
This publication includes Warning, Caution, and Information icons where appropriateto
point out safety relatedor other important information. It also includes Tip icons to point out
useful hints to the reader. The corresponding symbols should be interpreted as follows:
The electrical warningicon indicates thepresence of a hazard that couldresult in
electrical shock .
The warning icon indicates thepresence of ahazardthat could result in personal
injury
The caution icon indicates important information or warnings relatedto the con-
cept discussed in the text. It might indicate the presence of a hazard that could re-
sult in corruption of softwareor damageto equipment/property
The information icon alerts the reader to pertinent facts and conditions
Thetip icon indicates advice on, for example,howto design your project or howto
use a certain function
Although Warning notices are related to personal injury, andCaution notices are associated
with equipmentor property damage,it should beunderstoodthat theoperationof damaged
equipment could,under certainoperational conditions, result in impaired process
performance leadingtopersonalinjuryor death. It istherefore,imperative that you comply
fullywith all Warning and Caution notices.

TERMINOLOGY GENERAL
21TGC908004M0201
1.3. Terminology
Listof theterms, acronyms,abbreviations and definitions that thedocument uses.
Abbreviation
Term
Description
Alarm Alarm is definedas status transition from any
state to abnormal state. Status transition to
abnormalstate can be datacrossingover the
pre-defined alarm limit.
Bus Local A Control Access term describing that the M10x
accepts its commands from a device on the
switchgear control network, e.g. the Web Inter-
face, MView.
COTS Commercial off the
shelf Commercial off the shelf product, term to de- scribe products available onthemarket, ready
to use
DCS Distributed Control
System See also PCS
Eth. Ethernet Ethernet isa local area network (LAN)technol-
ogy. The Ethernet standard specifies the physical
medium, access control rules and the message
frames.
Event An event is a status transition from one state to
another. It can be definedas alarm, ifthestate
is defined as abnormal or as warning as a pre-
alarm state.
FD Field Device Term for devices connected to the Fieldbus
(e.g. motor controlunits or circuit breaker pro-
tection)
GPS Global Positioning
System System to detect local position, universaltime and time zone, GPS technology providesaccu-
ratetimeto a system
Hardware Local A Control Access term describingthat the M10x
accepts its commands from the Hardwiredin-
puts, when the respective Local control input is
set to true.
HMI Human Machine
Interface Generic expression
LVS Low voltage switch-
gear A factory built assembly built to conform with IEC 61439-1

GENERAL TERMINOLOGY
1TGC908004M0201 3
M10x M101-M
M102-M A microprocessor-based intelligent motor man- agement system that providesusers with com-
plete and specialized low voltage motor con-
trol, protection and monitoring. ‘-M’ indicates
that the device is equipped with a Modbus RTU
fieldbus interface.
MCC Motor Control Cen-
tre Common term forswitchgear used for motor control and protection.
MNavigate Configuration andparameterization tool for
MNS Digital
MNS Modular Low Voltage Switchgear family from
ABB
MODBUS Fieldbus communication protocol
MODBUS RTU Fieldbus communication protocol
MODBUS TCP/IP Fieldbus communication protocol based on
Ethernet hardware
Motor Starter Consists of motor controller and electrical com-
ponents to control and protect a motor, part of
Motor Control Center
NLS Native Language
Support Providing the ability to change the language of software tools inorder to support native lan-
guages (English is basis, others areoptional)
OPC Theindustrialstandard for exchange ofinfor-
mation between components and process con-
trolapplication.
PLC Programmable Local
Controller Low level control unit
RCU Remote Control Unit Local control unit with pushbuttonand indica-
tor to operate a device (e.g. motor) from field
level.
RS232 Standard No. 232for PCcommunication, estab-
lished by EIA (Electronics Industries Associa-
tion, USA)

TERMINOLOGY GENERAL
41TGC908004M0201
RS485 Communication interfacestandard from EIA
(Electronics Industries Association, USA), oper-
ating on voltages between 0V and +5V. RS-485
is morenoise resistant than RS-232C, handles
data transmission over longer distances,and
can drive more receivers.
RTC Real Time Clock Integratedclock function in devices used to
generatetimeand date information ifa remote
clock system is not present
Software Local A Control Access term describing that the M10X
accepts its commands from the hardwiredin-
putsas a result of either thePCS or MView
passing theControl Access Authorityto Soft-
Local.
Note: Does not require the hardwired local in-
put to beset to true.
SNTP Simple Network
Time Protocol A protocolused for time synchronization in Control Network through Ethernet
Switchgear Bus
Network Term used to describe the internal switchgear communicationnetwork, between MNS Digital
Gateway and M10X
TCP/IP Transmission Con-
trolProtocol / Inter-
net Protocol
TCP/IP is a high-level connection oriented, relia-
ble, full duplex communication protocol devel-
oped for integration of the heterogeneous sys-
tems.
Trip A consequence of an alarm activated or an ex-
ternal trip command from another deviceto
stopthemotor or tripthe circuit breaker.
UTC Coordinated
Universal Time Coordinated Universal Time is the international timestandard. It is thecurrent term for what
was commonly referredto as Greenwich Merid-
ian Time (GMT). Zero (0)hours UTC is midnight
in Greenwich England,which lies on the zero
longitudinal meridian. Universal timeis based
on a 24 hour clock.
Warning A warning is defined as status transition from
any stateto pre-alarm state to inform in ad-
vance before an alarm level is reached.

GENERAL RELATED DOCUMENTATION
1TGC908004M0201 5
1.4. Related Documentation
•1TNC911505 M10x-M Modbus Implementation
•1TNC911204 M10x-M Control System Integration Guide
•1TGC901101M0202 MNS Interface Manual Web Interface
•1TGC908001M0201 ABB AbilityCondition Monitoring for electrical systems user
manual
•1TNA810039 Manufacturing Instruction - Installation of MService and MNS
Digital Gateway in MNS

RELATED DOCUMENTATION INTRODUCTION
61TGC908004M0201
—
2. Introduction
The system interface MNS Digital Gateway is an industrial PC equipped with interface cards
and ports requiredfor communication internallyto M10x andexternallyto process control
systems as well asto the MNS Digital EdgeGateway which provides condition monitoring
features and functionsaswell as edge connectivityto ABB Ability™ cloud basedsolutions.
Figure 1: MNS Digital Gateway
OneMNS DigitalGateway can communicate internallyto upto 128 M10x / fielddevices by
Modbus RTU . If morethan 128 M10x / field devices are installed, then additional MNS Digital
Gateway haveto be configured.
Figure 2: MNS Digital System Configuration with M10x

INTRODUCTION HARDWARE TYPES AND TECHNICAL DATA
1TGC908004M0201 7
2.1. Hardware Types and Technical Data
The configuration ofMNS Digital Gateway depends on theselected communication protocol
to theDCS. For theModbus communication to DCS the hardware shown in thetable belowis
applicable
Fie
ldbus Protocol
Modbus
Fieldbus Hardware
Interface RS 485 & Ethernet TCP/IP
IEEE 802.3
RS 422& Ethernet TCP/IP
IEEE 802.3 RS 232& Ethernet TCP/IP
IEEE 802.3
MNS Digital Gate-
way ID
1TGE120021R0810
Picture
Table 1 MNS Digital Gateway Modbus Hardware
For communicationtoM10X,MNS DigitalGateway is connectedviaRS485 with Modbus RTU
protocol. As one segment of Modbus RTU is only able to support 32 devices, MNS Digital
Gateway for M10x is supplied with four Modbus RTU portto support a maximum of 128 num-
ber of devices.
ELECTRICAL DATA
Power Supply
24
V DC (
19
–
31
V DC)
Power Consumption
Typical
800
mA, maximum
1000
mA
MECHANICAL DATA
Weight
2.5
kg
Dimensions Hx W x D
140
x
160
x
165
mm
ENVIRONMENTAL DATA
Storage Temperature
-
20
o
C to + 70
o
C
Operating Temperature
0
o
C to 55
o
C
Degree of Protection
IP51
MTBF (Mean Time Between Failures)
46 years @ 40
o
C
Table 2 MNS Digital Gateway Technical Data

MODBUS STANDARD INTRODUCTION
81TGC908004M0201
2.2. Modbus Standard
MODBUSis aserialdata communication protocol andwas originally developed as a
communication languagefor MODICONprogrammable controllers, its rightsnowresidewith
theModbus-IDAorganization.
Thesoftwareon theMNSDigitalGateway supports the pure Master-Slaveoperation as
defined in the MODBUS RTU specification. This manual describes the MNS Digital Gateway
communication with MODBUS protocolin RTU and TCP modes.
TheMODBUS communication protocolisimplemented within theMNSDigitalGateway to
enableMNS Digital to provide interface possibilitiesto process control systemsor any other
external systems that supports MODBUS RTU / TCP protocol handling.
TheMODBUS configuration can beused in point to point configurationor inmulti-drop
mode. InMaster-Slave MODBUS architecture,theMNS DigitalGateway is always usedin a
slave (TCPServer)mode. The masterstation controlsthetrafficon the bus, inthis case,by
PCS/DCS or PLC system. TheMNS Digital Gateway responds to the queries received from
masterstation as per the MODBUS specification.
2.2.1. Basics
Figure 3 Master Slave Query Response Cycle

INTRODUCTION MODBUS STANDARD
1TGC908004M0201 9
2.2.1.1. The Query
Thefunction code (FC) inthe query tells theaddressedslave device what kind of action to
perform.The databytes contain any additional information that theslave willneedto
perform thefunction. For example,function code 03 will querytheslaveto read holding
registers and respond with their contents. The data field must contain the information telling
theslave which registertostart at andhow many registers to read. The error check field
provides a method for the slave to validate the integrity of the message contents.
2.2.1.2. The Response
If the slave makes a normal response, the function code in the response is an echo of the
function code in the query. The data bytes contain the data collected by the slave, such as
register values or status. If an error occurs, the function code is modifiedto indicate that the
response is an error response,andthe databytescontain acodethat describes theerror. The
error check field allows the masterto confirm that the message contents are valid.
2.2.1.3. Characteristics
Certain characteristics of the MODBUS protocol, as specified bythereference document, are
fixedsuch astheframeformat, framesequences, handlingof communication errors and
exception conditions, and the functions performed. In case of the MNS DigitalGateway, the
transmission modeis also limited to RTU or TCP.
Other characteristicsareuser selectable. These include a choice of transmission medium,
baud rate and character parity, number of stop bits.Theseparameters cannotbechanged
while the communication interface is active.
The OSI layers 1, 2, and 7 are implemented in theMNS DigitalGateway
Layer 1, 2:
In these layers thephysical sending andreceivingof bytes, i.e.triggering of theinterface
hardware including monitoring of timeouts and CRC-Check generation as well as processing
of addresses is realized.Upon receipt, the faultstates,time-out and CRC-Error are being
detected and treated according to the MODBUS RTU specification.
Layer 7:
In this layer the analysis and treatment of thefunctioncodes (FC)is implemented. This
includes processing the received commands (read andwrite of MODBUS-registers) and
generation of the response-message together with the addressed data.
2.2.1.4. Mode of Transmission
The mode of transmission is the structure of the individual units of information within a
message, and the numbering system used to transmit the data. Two modes of transmission
are available for use in a standard MODBUS communication, ASCII (American Standard Code
for Information Interchange), andRTU (Remote Terminal Unit). Both modes provide the same
capabilities for communication. Selecting ASCII or RTU mode defines the bit contents of
message fields, andhow information ispackedanddecoded.
MNS Digital Gateway does not support ASCII transmission.

MODBUS STANDARD INTRODUCTION
10 1TGC908004M0201
Characteristic
RTU (
8
-
bit)
Coding Syste
m
8
-
bit
Number of bits per character:
Start bits
Data bits (least significant first)
Parity
Stop bits
1
8
1 (1
bit set for even or odd parity, no bits for no
parity)
1
or
2
Error Checking
CRC (Cyclical Redundancy Check)
Table 3 Modbus RTU modeof Transmission
2.2.1.5. Error Detection
There are two types of errors, which may occur in a communication system:
•Transmission error and
•Programming or Communication error
The MNS Digital Gateway deals with either type of error as specified in MODBUS specification.
The most frequent cause of communication error is noise, unwanted electrical signals in a
communication channel. These signals occur because of electrical interference from
machinery, damage to the communication channel, impulse noise (spikes), etc. Character
framing, a parity check, and a redundancy check detect these errors. When the error occurs,
the messageis unreliable and the processing of the last received erroneous messagestops.
Programming or operational errors are those involving illegal data in a message or difficulty in
communicating with a slave. These errors result in an exception response either from Master
or Slavestation.

INTERFACES FRONT VIEW
1TGC908004M0201 11
—
3.Interfaces
3.1. Front View
Figure 4 MNS Digital Gateway front view
POWER SUPPLY
Button Reset Reset button (Restart of MNS Digital Gate-
way)
24
V
Power Supply+24VDC
GND
Power Supply 0V
CF CARD
CF Card CF card is protectedagainstunintentional
removal after closingtheflap and connect-
ingthep
ower supply
PORTS
LAN
1
LAN 1 Interface (Modbus TCP)
LAN 1
–
LED left, green
Link LAN 1 active
LAN 1
–
LED right, yellow
Communication Ethernet LAN 1
LAN 2 LAN 2 Interface (Switchgear Control
Network)
M10x serial 4-port
connector
Redundancy connector –
Serial 1
Modbus RTU connector –
Serial 2

POWER SUPPLY INTERFACES
12 1TGC908004M0201
LAN 2
–
LED left, green
Link LAN 2act
ive
LAN 2 –LED right, yellow Communication Ethernet LAN 2
LAN
3
LAN 3 Interface (Notused)
LAN 3
–
LED left, green
Link LAN 3 active
LAN 3 – LED right, yellow Communication Ethernet LAN 3
USB
1
,
2
Not used
Serial
1
Redundancy Interface (male plug)
Serial 2 Modbus RTU Interface (female plug)
LED
INDICATIONS
LED 1 MNS Digital Gateway Run indication (CF card
application loaded and running)
LED 2
MNS Digital Gateway Fault
LED 3 Application dependent (seesection LED in-
dication, page 60)
LED 4 Application dependent (seesection LED in-
dication, page
60
)
LED 5 Application dependent (see section LED in-
dication, page
60
)
LED 6
DCS Communicationactive
LED 7 MNS Digital GatewayPower On Indication
LED 8 Application dependent (see section LED in-
dication, page 60) In redundant configura-
tions: MNS Digital Gateway primary
Table 4 Front View Connectors, LED and PushButtons
3.2. Power Supply
TheMNS DigitalGateway requires 24V DC supply voltage. The connection is on the left sideof
the device with terminal plugs:
–Terminal 1 connects to +24VDC
–Terminal 2 connects to 0V DC
Figure 5 Power Supply Connector
1 - Power Supply +24VDC
2 - Power Supply 0VDC
1
2