ABB PSE User manual

Softstarters

Type PSE

Fieldbus Communication

Fieldbus Plug Modbus TCP

1SFC132374M0201

January 2019

1SFC132374M0201 1

Cyber Security Legal Disclaimer

This product is designed to be connected to and to communicate information and data via a network interface. It

is your sole responsibility to provide and continuously ensure a secure connection between the product and your

network or any other network (as the case may be). You shall establish and maintain any appropriate measures

(such as but not limited to the installation of firewalls, application of authentication measures, encryption of data,

installation of anti-virus programs, etc.) to protect the product, the network, its system and the interface against

any kind of security breaches, unauthorized access, interference, intrusion, leakage and/or theft of data or

information. ABB Ltd and its affiliates are not liable for damages and/or losses related to such security breaches,

any unauthorized access, interference, intrusion, leakage and/or theft of data or information.

Risk Mitigation and Secure Deployment

The idea is to create defence-in-depth protection for each network by allocating firewall solutions to the front of

internal trusted networks of each network by manage firewalls, their configurations and access rules. The

softstarter must be positioned in a trusted network, strictly limited and in a hosted portion of a network or control

system. Configure firewalls according to the principle of denying everything that is not needed nor used. For

secure remote access, use a VPN connection with an encryption layer to create a secure channel over an insecure

network. For more information regarding cyber security and risk mitigation, download the document Cyber

security for ABB drives from the ABB library.

Note: The device uses the default Modbus TCP port 502 (0x01F6). This port must be open in the firewall for

both incoming and outgoing traffic to allow Modbus-TCP compatible devices to communicate.

1SFC132374M0201 2

Contents

1Overview........................................................................................................................................................ 3

2Technical Description..................................................................................................................................... 4

2.1 Modbus TCP.......................................................................................................................................... 4

2.2 MTQ22-FBP.......................................................................................................................................... 5

2.3 Connection Setup................................................................................................................................... 6

3Software Configuration .................................................................................................................................. 7

3.1 PSE Softstarter....................................................................................................................................... 7

3.2 MTQ22-FBP........................................................................................................................................ 10

4Modbus TCP Register Map.......................................................................................................................... 14

4.1 Digital Input Telegram ........................................................................................................................ 14

4.2 Digital Output Telegram...................................................................................................................... 16

4.3 Analog Input Telegram........................................................................................................................ 17

4.4 Parameters ........................................................................................................................................... 17

4.5 Diagnostics .......................................................................................................................................... 18

4.5.1 MTQ22-FBP ................................................................................................................................... 18

4.5.2 PSE Softstarter ................................................................................................................................ 18

5MTQ22-FBP LED Diagnostics in Case of Error.......................................................................................... 20

6Basic TCP Modbus Diagnostic Information ................................................................................................ 21

1SFC132374M0201 3

1 Overview

This document aims to describe the installation and configuration process of the MTQ22-FBP Modbus TCP

adapter module. Modbus is a master-slave protocol and only one device can transmit on the line at any time. The

master (which in most cases is a PLC) manages the exchanges and only it can take the initiative. It interrogates

each of the slaves in succession and no slave can send a message unless it is invited to do so. The master repeats

the question when there is an incorrect exchange, and declares the interrogated slave absent if no response is

received within a given time period. If a slave does not understand a message, it sends an exception response to

the master who may or may not repeat the request.

The adapter will be used to enable Modbus TCP communication between an ABB PSE softstarter and a Modbus

master over an IP network. The TCP Modbus communication protocol differs from the other Modbus versions

through the use of TCP/IP communication as a wrapper for the Modbus data. Modbus RTU messages are sent

over an IP network. The use of IP datagrams removes the need for slave addresses since all slaves use a unique

IP address to enable IP communication. However, The MTQ22-FBP still uses Modbus RTU to communicate

with the PSE which require the slave ID to match between the MTQ22-FBP and the PSE, as explained in section

3.2.

The document starts with technical information regarding the required devices and a description of how to

connect them to enable Modbus TCP communication. The third chapter explains how to configure the PSE and

MTQ22-FBP software, Fieldbus Control, Slave address, IP address and other important parameters are

configured with detailed instructions. The fourth chapter presents the MTQ22-FBP data registers, used to read or

write data to the connected PSE devices. In case of any TCP Modbus connection problems, chapter 5 explains

the meaning of the MTQ22-FBP diagnostic LED indicators. This manual is written specifically for Modbus TCP

and will not cover other fieldbus protocols or other devices then ABB Softstarters type PSE18…PSE370. For

more detailed information regarding warranty, service, type designation and other product specific information

for the associated devices, see respective manual.

Requirements

To connect the PSE Softstarter to a fieldbus system, the following accessories are required:

•ABB FieldBusPlug Accessory (FBPA)

•ABB MTQ22-FBP (Modbus TCP)

•Cable for bus connection (CDP19-FBP .100)

•Micro USB cable

•ABB PSE softstarter

•Software for MTQ22-FBP set-up (ABB Config Tool)

•PLC or another Modbus TCP master

1SFC132374M0201 4

2 Technical Description

The following list highlights the core features and functionalities provided by the MTQ22-FBP and Modbus TCP

protocol.

Highlighted Features

The MTQ22-FBP Ethernet adapter module provides Ethernet connectivity for the ABB PSE softstarter

Fieldbus plug (FBP) device.

Up to four FBP devices can be connected to one MTQ22-FBP. This allows a very cost-efficient

connection of FBP devices to Ethernet.

Through the MTQ22-FBP Ethernet Adapter module it is possible to:

oGive control commands to the device (Start, Stop, Set Auto Mode, etc.)

oRead status information and actual values from the device

oRead maintenance counters

oReset a trip

A built in two-port switch allows the flexible usage in bus, star or ring network topologies.

Up to four masters can concurrently access the connected devices.

Access via Modbus TCP can be restricted to a limited set of IP addresses.

The Media Redundancy Protocol (MRP) is implemented (client). MRP is standardized in IEC/EN

62439-2 and offers cable redundancy in case of a single failure.

2.1 Modbus TCP

Modbus TCP is a variant of the Modbus family of simple, vendor neutral communication protocols intended for

supervision and control of automation equipment. Specifically, it covers the use of Modbus messaging over TCP

connections on an IP network.

The implementation of the Modbus TCP server in the MTQ22-FBP module is done according to:

Modbus Application Protocol Specification v1.1b

Modbus Messaging on TCP/IP Implementation Guide v1.0b

The supported Modbus commands can be found in chapter 4. Further information on the Modbus TCP protocol

is available at www.modbus.org.

1SFC132374M0201 5

2.2 MTQ22-FBP

A device layout of the MTQ22-FBP can be seen in Figure 1. Connectors X1 ... X4 are used to connect up to four

FBP devices to the MTQ22-FBP. On the left side of the port connectors LEDs show the current communication

status. See chapter 5 for detailed information regarding status LEDs.

Figure 1: Top view of the MTQ22-FBP. Four PSE devices can be connected to the MTQ22 via the ports X1 to X4. The

standard Micro USB connector X5 allows to configure the device.

The Micro USB connector X5 allows device configuration using a PC, see chapter MTQ22-FBP. Two RJ45

sockets E1 and E2 offer Ethernet connectivity. The communication status of each interface is shown by two

LEDs. The MTQ22-FBP must be supplied with 24VDC via X6.

Mounting and Dismounting

You can mount and dismount the MTQ22-FBP onto a 35 mm standard mounting rail, without tools.

Arrange the communication cables as far away from the motor cables as possible. Avoid parallel runs. Use

bushings at cable entries. The network cable is connected to the RJ45 connectors on the MTQ22-FBP module.

Standard CAT5 UTP, FTP or STP cables can be used. The shield of the RJ45 cable is connected to the shield of

connector X6.

1SFC132374M0201 6

2.3 Connection Setup

In order for Modbus to function properly the PSE must be connected point-to-point with a Fieldbus Plug

Accessory (PS-FBPA) as seen in Figure 2. Further the PS-FBPA must be connected to one of the ports named

X1 to X4 on the MTQ22-FBP. The Modbus master is in turn connected to one of the Ethernet connections E1 or

E2.

Figure 2: Device connections required to enable a Modbus TCP connection between the PSE and a Modbus master.

The cable connecting the PS-FBPA and the MTQ22-FBP, a CDP19-FBP .100 cable must be purchased

separately. A spring terminal block connector must also be installed on the separate cable and connected

according to Figure 3.

Figure 3: MTQ22-FBP port connection specification.

1SFC132374M0201 7

3 Software Configuration

This chapter describes how to configure the MTQ22-FBP and the PSE to enable Modbus communication.

3.1 PSE Softstarter

The following list of instructions explains how to configure the fieldbus parameters on the PSE softstarter.

1. Fieldbus Control

This parameter is used for configuration of the fieldbus communication. Connecting the PSE Softstarter to the

Fieldbus plug automatically enables fieldbus communication. To enable control of the softstarter using fieldbus,

this parameter must be set to On. If Fieldbus Control is set to OFF, fieldbus can only be used for monitoring

softstarter data.

If this parameter is set to On, the softstarter might trip on fieldbus

fault if no fieldbus communication is available. If the intention is

to run without fieldbus control, this parameter should be set to

OFF.

2. Fieldbus Address

The parameter Fieldbus Address allows setting of address for the fieldbus communication. The setting range for

the fieldbus address is 0...255. If the address is set to 255, the address stored in internal memory of the fieldbus

plug will be used.

It is possible to read and set this parameter via the keypad when Fieldbus Control is set to On or OFF.

Changing this parameter will automatically reset the fieldbus

interface and the new address will be active. If MTQ22-FBP was

communicating with the old address, the MTQ22-FBP needs to be

re-configured and the PSE restarted.

Default value

Setting range

Description

255

0…255

Fieldbus Address

1SFC132374M0201 8

3. Fieldbus Type

The fieldbus type parameter must be set to FbP (fieldbus plug) when using the MTQ22-FBP. FbP is the default

value of the parameter. The PSE has a built-in version of Modbus which is activated by setting the parameter to

Int (Internal).

When FbP is selected –configured to use external fieldbus plug,

such as the MTQ22-FBP.

When Init is selected –PSE will use the internal Modbus

implementation to communicate with external devices.

Default value

Setting range

Description

FbP

FbP/Int

FbP enables the use of external

fieldbus plugs. The Int parameter

should be set when using the

internal Modbus interface

4. Download Parameter

This parameter allows for blocking parameter download from the fieldbus. Note that download of parameters

works differently for different fieldbus protocols. See documentation for the protocol used.

It is possible to read and set this parameter via the keypad when

Fieldbus Control is set to On or OFF.

Default value

Setting range

Description

dPon

dPo/dPof

Enable/disable parameter

download

1SFC132374M0201 9

5. Fieldbus Operation When Fault

This parameter is accessible only if Fieldbus Control is previously set to On.

In case of fieldbus malfunction, for instance due to power loss or a broken cable, this parameter allows for

different (operations in case of a fault) reactions to the fault.

Setting Fieldbus fault reaction to trIP will make the softstarter trip on a fieldbus fault. Selecting trIP makes reset

of the fault necessary, in case of a tripping event.

When LocC is selected, the control of the softstarter will

automatically switch from fieldbus control to local control. The

switch to local control will make hard-wire control possible. When

the Fieldbus starts working again the control is automatically

switched back to the Fieldbus. There is a 10 second delay before it

is possible to controlling the motor.

Default value

Setting range

Description

LooC

Looc/trlP

Trip on fieldbus fault or

automatically move to local

control on fieldbus fault

6. Type of Operation for Reset of Fieldbus Fault

Select what operation shall be asserted if a fieldbus communication fault occurs. Manual or automatic options

are available. HAnd is the default value for reset of Fieldbus Fault:

• If HAnd is selected - The motor will stop and manual

reset is required.

• If Auto is selected - The motor will stop and automatic

reset is performed.

This parameter is accessible only if trIP is previously

selected for the parameter fieldbus Operation When

Fault.

Default value

Setting range

Description

HAnd

HAnd/Auto

Hand require manual reset of

fieldbus fault while Auto will

perform the reset automatically.

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