Thomson MEC 310 Option M – Modbus Communications

MEC 310

GENSET CONTROLLER

Option M – Modbus Communications

r.0442C

9087A – 198th Street, Langley, BC Canada V1M 3B1  Telephone (604) 888-0110

Fax (604) 888-3381  E-Mail: info@thomsontechnology.com  www.thomsontechnology.com

PM080 Rev 0 07/06/18

MEC 310 GENSET CONTROLLER WITH MODBUS

TABLE OF CONTENTS

1. WARNINGS AND LEGAL INFORMATION................................................................... 1

EGAL INFORMATION AND RESPONSIBILITY

L

LECTROSTATIC DISCHARGE AWARENESS

E

AFETY ISSUES

S

EFINITIONS

D

................................................................................................................... 1

....................................................................................................................... 1

............................................................................. 1

2. DESCRIPTION OF OPTION ......................................................................................... 2

ANSI

O

T

H

W

NUMBERS

PTION

ERMINAL DESCRIPTION

ARDWARE SETTINGS

M - M

IRING

.............................................................................................................................. 2

.................................................................................................................. 2

ODBUS

.......................................................................................................... 2

....................................................................................................... 2

......................................................................................................... 2

3. PARAMETER LIST ....................................................................................................... 3

4. DATA TABLES.............................................................................................................. 4

ONFIGURABLE AREA (READ ONLY

C

EASUREMENT TABLE (READ ONLY

M

LARM AND STATUS TABLE (READ ONLY

A

ONTROL REGISTER TABLE READ

C

OMMAND FLAGS TABLE (WRITE ONLY

C

TATUS FLAGS TABLE (READ ONLY

S

FUNCTION CODE 04H

) (

FUNCTION CODE 04H

) (

FUNCTION CODE 04H

) (

(03H)/

WRITE

) (

FUNCTION CODE 02H

) (

(10H) ............................................................ 17

FUNCTION CODE 0FH

) ..................................................... 4

) .................................................... 9

)............................................ 12

).............................................. 18

)................................................... 19

PM080 Rev 0 07/06/18 Thomson Technology

The notes provide general information which will be helpful for the reader to

The warnings indicate a potentially dangerous situation which could result in

t

followed.

Be aware of the hazardous live currents and voltages. Do not touch any AC

1. Warnings and legal information

Legal information and responsibility

Thomson Technology takes no responsibility for installation or operation of the generator set. If there is any doubt about how to install or operate the generator set controlled by the unit, the company responsible for the installation or the operation of the set must be contacted.

The units are not to be opened by unauthorised personnel. If opened anyway, the

Sufficient care must be taken to protect the terminals against static discharges during the installation. Once the unit is installed and connected, these precautions are no longer necessary.

Installing the unit implies work with dangerous currents and voltages. Therefore, the installation should only be carried out by authorised personnel who understand the risks involved in working with live electrical equipment.

measurement inputs as this could lead to injury or death.

warranty will be lost.

Electrostatic discharge awareness

Safety issues

Definitions

Throughout this document a number of notes and warnings will be presented. To ensure that these are noticed, they will be highlighted in order to separate them from the general text.

Notes

Warning

bear in mind.

death, personal injury or damaged equipment, if certain guidelines are no

PM080 Rev 0 07/06/18 1 Thomson Technology

MEC310

PLC

2

) twisted pair,

shielded, <40 m



/m, min. 95% shield coverage.

2. Description of option

ANSI numbers

Function ANSI no.

RS485 modbus communication -

Option M - Modbus

The Modbus option is a hardware and software option.

Terminal description

Term. Function Description

49 DATA - (Tx) 50 GND 51 DATA + (Rx) 52 Not used

Modbus RTU, RS485

Hardware settings

These are the MEC 310 RS485 hardware settings:

a. 9600 or 19200 bps b. 8 data bits c. None parity d. 1 stop bit

Modbus Slave

GND

Rx

49

50

51

Data

GND

Data

Rx

Tx

Modbus Slave

GND

Rx

50

51

Wiring

Tx

49

Modbus Slave

Tx

GND

Rx

49

50

51

Modbus Master

PM080 Rev 0 07/06/18 2 Thomson Technology

Cable: Belden 3105A or equivalent. 22 AWG (0.6 mm

The mode ASCII is used for modem communication (ASCII: 7 data bit. RTU: 8

7510 Ext. communication

No. Setting Min. setting Max. setting Factory

7511 Ext. communication ID 1 247 1 7512 Ext. communication Baud rate 9600 Baud 19200 Baud 9600 Baud 7513 Ext. communication Mode RTU ASCII RTU

data bit).

3. Parameter list

setting

PM080 Rev 0 07/06/18 3 Thomson Technology

4. Data tables

Example:

Read measured Supply Voltage (U

1. Determine required parameters: MEC 310 ID (default) = 01h Function Code (Read) = 04h Offset Address (from table below) = 34d -> 22h

Request length of 1 word = 01h

2. Create and send Modbus command; receive response:

Tx: 01h 04h 00h 22h 00h 01h 91h C0h Rx: 01h 04h 02h 00h EDh 79h 7Dh Where the last two words of each message are automatically generated CRC codes

3. Interpret Data: Read 00 ED h = 237d [V/10] = 23.7 V

Configurable area (read only) (function code 04h)

Address Content Type

0 U 1 U 2 U 3 U 4 U 5 U 6 f 7 IL1 Generator current. Measured in [A] 8 IL2 Generator current. Measured in [A] 9 IL3 Generator current. Measured in [A] 10 P

11 Q

12 S 13 Cos-phi -99...0...100 generator cosinus-phi. Measured in cos-

16 [HI] 17 [LO] 18 U

19 U 20 U 21 U 22 U 23 U 24 F