Environdata MB40 Manuel utilisateur

MB40 & MB45 MODBUS

TCP/IP Gateway

Handbook

Version 1.2

29 July 2014

Environdata Australia Pty Ltd

42-44 Percy Street Warwick

Queensland 4370 Australia

Phone: (07) 4661 4699

Fax: (07) 4661 2485

International Phone: +61 7 4661 4699

International Fax: +61 7 4661 2485

Email: [email protected]

http://www.environdata.com.au

Material in this handbook is Copyright.

No reproduction without the prior permission of the publishers.

MB40 & MB45 MODBUS TCP/IP Gateway Page 1of 21

MB40 & MB45 MODBUS TCP/IP Gateway –DL30 type Environdata

Weather Stations

Connects an Environdata DL3000 Weather Station to a Modbus network

Modbus RTU over RS485 and Modbus TCP/IP over Ethernet compatible

Easy Modbus TCP/IP configuration via webpage, Modbus registers, or on-board switches

Supports three simultaneous Modbus TCP masters.

Retrieves current weather values, 10 minute values, hourly values, and daily values.

Can be used to synchronise the date and time of the Weather Station directly

Overview

The MB40 Modbus TCP DL3000 Gateway allows the easy connection of a PLC (Programmable Logic

Controller), RTU (Remote Telemetry Unit) or SCADA System to a Weather Station. Using the Modbus

RTU (Binary), or Modbus TCP/IP (Ethernet) protocols, it enables a programmable controller to

monitor and carry out actions based on wind speed, wind direction, temperature and many other

weather based variables.

The MB40 Modbus TCP DL3000 Gateway is a major upgrade to MB30 Serial DL3000 Gateway. It

provides all the functionality of the MB30, with the following improvements:

Addition of Ethernet:

Allows the MB40 to be polled by up to three Modbus TCP/IP masters simultaneously

Provides a webpage whereby TCP/IP settings can be easily monitored and altered. Also

shows current communications statuses.

Can be interrogated over HTTP to return Modbus register values in XML format

Retrieves the current weather data, as well as the 10 minute, hourly, and daily weather data.

Allows up to 125 registers to be polled at once –previously limited to 30.

Provides a method to set up the date and time of the DL3000 Weather Station.

Turns off “verbose mode” on the weather station.

MB40 is a standalone version that is suitable for DIN rail mounting, while MB45 is enclosed in the

sealed housing of the weather recorder with access via a sealed gland.

MB40 & MB45 MODBUS TCP/IP Gateway Page 2of 21

Please Note

Please note that Environdata’s software program, EasiAccess, will NOT connect to the MB40 / MB45.

This is because EasiAccess does NOT use the MODBUS protocol.

EasiAccess can connect DIRECTLY to an Environdata Weather Station via either a LAN (TCP/IP)

address or a serial (COM) port. But in both cases, the communication is text commands, and NOT

MODBUS commands.

MODBUSVIEW TCP is a program that can connect via either a LAN (TCP/IP) address or a serial (COM)

port, and does use MODBUS commands. You can get a copy of this program either from the

Environdata EasiAccess distribution CD or download from the Internet at

https://oceancontrols.com.au/OCS-011.html

As a free copy, MODBUSVIEW TCP will work for 15 minutes as a test program. Restarting the

program will provide a further 15 minutes operation, as required.

MB40 & MB45 MODBUS TCP/IP Gateway Page 3of 21

Contents

MB40 & MB45 MODBUS TCP/IP Gateway –DL30 type Environdata Weather Stations ........................ 1

Overview .............................................................................................................................................1

Please Note .........................................................................................................................................2

Getting Started.................................................................................................................................... 4

Configuring the MB40..................................................................................................................... 4

Configuring Modbus ...........................................................................................................................5

Modbus RTU....................................................................................................................................5

Modbus TCP/IP & Ethernet Webserver .............................................................................................. 6

Configuration Using Switches –Switch 1......................................................................................... 6

Configuration Using Switches –Switch 2......................................................................................... 6

Configuration Using Switches –Switch 3 & 4 .................................................................................. 7

Configuration Using Switches –Switch 5 to 8 .................................................................................7

Configuration Using Webpage ........................................................................................................7

Configuration Using Modbus (RTU or TCP/IP) ................................................................................ 8

Weather Station Data ......................................................................................................................... 9

Current Weather Data ....................................................................................................................9

Daily Weather Data.........................................................................................................................9

Last Hourly Data.............................................................................................................................. 9

Last 10-Minute Data......................................................................................................................10

Functionality .....................................................................................................................................10

Weather Station Polling Period..................................................................................................... 10

Weather Station Date and Time Configuration ............................................................................ 11

Webpage...........................................................................................................................................12

XML Request .....................................................................................................................................13

Single Register............................................................................................................................... 13

All Registers...................................................................................................................................14

Error Request ................................................................................................................................15

Troubleshooting................................................................................................................................16

Power Connected..........................................................................................................................16

Weather station Comms ...............................................................................................................16

Ethernet ........................................................................................................................................16

RS485 ............................................................................................................................................16

Troubleshooting Procedure ..........................................................................................................16

Appendix A........................................................................................................................................19

Complete Holding Register Listing ................................................................................................ 19

MB40 & MB45 MODBUS TCP/IP Gateway Page 4of 21

Getting Started

Configuring the MB40

Table 1: Connections to the MB40

Connection

Description

V +

Power Positive (8 to 28V DC)

GND

Power Negative (Ground)

D +

RS485 Data +

D -

RS485 Data -

GND

Ground

Male D9

Serial communications (RS232) between MB40 and Weather Station

RJ45 Socket

Ethernet Port

Table 2: MB40 LED Functions

LED

Function

Red Tx LED (next to RS485 terminal)

Indicates serial communications received on RS485

Green Rx LED (next to RS485

terminal)

Indicates serial communications sent (Modbus RTU) on

RS485

Green Rx LED next to D9 connector

Indicates serial communications received (from weather

station) on the serial port

Red Tx LED next to D9 connector

Indicates serial communications sent on the serial port

Green LED (right side) on RJ45 socket

Link LED. Always on to indicate good status for Ethernet,

flashes to indicate activity.

Yellow LED (left side) on RJ45 socket

FDX LED.

On = Full duplex Ethernet

Off = Half duplex Ethernet

Green Rx LED next to RJ45 socket

Flashes when packets are received on the Ethernet port.

Red Tx LED next to RJ45 socket

Flashes when packets are sent on the Ethernet port.

MB40 & MB45 MODBUS TCP/IP Gateway Page 5of 21

Configuring Modbus

Modbus RTU

Serial Modbus is provided on RS485. The communications settings for this port are set 8 DIP

switches next to the D9 connector. Any changes to the switches won’t take effect until the MB40 is

power cycled.

Table 3: Modbus RTU address switches

Modbus RTU Address

Switch 1

Switch 2

Switch 3

Switch 4

OFF

Table 4: Modbus RTU Baud Rate switches

Baud Rate

Switch 5

Switch 6

2400

OFF

4800

OFF

9600

OFF

19200

Table 5: Modbus RTU Parity switches

Parity

Switch 7

Switch 8

None

OFF

Even

OFF

Odd

OFF

Boot-loader1

The boot-loader is an advanced function that allows firmware updates to be deployed in the field.

MB40 & MB45 MODBUS TCP/IP Gateway Page 6of 21

Modbus TCP/IP & Ethernet Webserver

To communicate over a TCP/IP network, the MB40 needs five pieces of information:

1. The Internet Protocol (IP) address of the MB40 within the network. Set by the user

2. The Subnet Mask of the network. Set by the user

3. The Default Gateway of the network. Set by the user.

4. A unique MAC address. Shipped preloaded by Environdata.

5. The TCP/IP port the request is being sent on. For the MB40, Modbus TCP/IP is on port 502,

and the webserver (HTTP) is on port 80.

These settings themselves can be set by one of three available methods:

1. The 8 DIP switches next to the D9 connector.

2. Modbus registers (using either Modbus RTU on RS485 or Modbus TCP/IP on Ethernet)

3. The webpage.

Configuration Using Switches –Switch 1

Switch one determines where the TCP/IP settings are loaded from when power is applied to the

MB40. With this switch off, settings are loaded from the current values of the switches, regardless of

previous settings. With the switch on, the settings are loaded from internal memory - saved after

being previously configured via the webpage or Modbus.

Table 6: TCP/IP mode switch

Power Up Configuration

Switch 1

OFF

TCP/IP settings from switches

TCP/IP settings from internal persistent memory

Configuration Using Switches –Switch 2

Switch two is the “panic switch”, returning the MB40 to default if the user writes incorrect values or

doesn’t otherwise know what settings the card currently possesses. To use, flick the switch on, hold

for one second, and turn back off again. Don’t leave this switch on; the card will be constantly

resetting and therefore unresponsive.

Default Values

IP Address: 192.168.1.100

Subnet Mask: 255.255.255.0

Default Gateway: 192.168.1.1

Table 7: TCP/IP Reset Switch

Reset to Default

Switch 2

OFF

No action

TCP/IP settings reset to default

MB40 & MB45 MODBUS TCP/IP Gateway Page 7of 21

Configuration Using Switches –Switch 3 & 4

Switches three and four choose between four different TCP/IP schemes commonly used in private

address space:

Table 8: TCP/IP Subnet switches

TCP/IP Base Settings

Switch 3

Switch 4

IP Address: 192.168.1.x

Subnet Mask: 255.255.255.0

Default Gateway: 192.168.1.1

OFF

IP Address: 10.0.0.x

Subnet Mask: 255.0.0.0

Default Gateway: 10.0.0.1

OFF

IP Address: 10.1.1.x

Subnet Mask: 255.255.0.0

Default Gateway: 10.1.1.1

OFF

IP Address: 172.16.0.x

Subnet Mask: 255.240.0.0

Default Gateway: 172.16.0.1

Configuration Using Switches –Switch 5 to 8

The final four switches determine the last octet of the IP address.

Table 9: TCP/IP IP Address switches

Last Octet (IP Address)

Switch 5

Switch 6

Switch 7

Switch 8

100

OFF

101

OFF

102

OFF

103

OFF

104

OFF

105

OFF

106

OFF

107

OFF

108

OFF

109

OFF

110

OFF

111

OFF

112

OFF

113

OFF

114

OFF

115

Configuration Using Webpage

The MB40 has an inbuilt web server that can service HTTP requests on port 80. Simply point your

web browser to the IP Address of the MB40 to retrieve this page.

MB40 & MB45 MODBUS TCP/IP Gateway Page 8of 21

Below the current communications statuses is a web form with provision to set the TCP/IP settings

of the MB40. The form fields will be populated with the Gateway’s current values. These can be

altered and written to the MB40.

After writing these values, you will likely want to change TCP switch 1 to read from memory on the

next power up, otherwise the TCP/IP configuration will read from the switches.

Configuration Using Modbus (RTU or TCP/IP)

The MB40 has 13 Modbus holding registers reserved for configuration. These settings can be read

and written using either serial Modbus (RTU on RS485) or Modbus TCP/IP.

Table 10: Modbus TCP/IP Configuration Registers

Modbus Register

Function

256

1st octet IP Address

257

2nd octet IP Address

258

3rd octet IP Address

259

4th octet IP Address

260

1st octet Subnet Mask

261

2nd octet Subnet Mask

262

3rd octet Subnet Mask

263

4th octet Subnet Mask

264

1st octet Default Gateway

265

2nd octet Default Gateway

266

3rd octet Default Gateway

267

4th octet Default Gateway

268

Commit to Gateway (write a 1)

Each register holds one octet of the TCP/IP configuration. These can be read to view the current

TCP/IP settings, or written to set the values. Once all twelve octets are manually set, the settings are

committed to the gateway by writing a one to holding register 268. Make sure all registers are

written with correct values before they are committed to the gateway.

MB40 & MB45 MODBUS TCP/IP Gateway Page 9of 21

Weather Station Data

The gateway operates as a Modbus slave. To access the holding registers in the gateway, the PLC or

RTU must be configured as a Modbus Master. Using Modbus Function 3, the PLC can read the

Holding Registers.

Current Weather Data

Table 11: R3 Modbus Register Listing

Holding Register

Address 40,000+

No. of

Registers

Type

Description

Time

Year in format YYYY

Time

Month and day in format MMDD

Time

Hour in format HH

Time

Minute and second in format MMSS

5 to 59

Data

Unpacked weather data. Up to 54 “pieces” of comma separated

data is sequentially unpacked and placed into holding registers.

Status

Comms status for the R3 command. 0 = bad, 1 = good.

Daily Weather Data

Table 12: MEM 1 LAST Modbus Register Listing

Holding Register

Address 40,000+

No. of

Registers

Type

Description

Time

Year in format YYYY

Time

Month and day in format MMDD

Time

Hour in format HH

Time

Minute and second in format MMSS

65 to 119

Data

Unpacked weather data. Up to 54 “pieces” of comma separated

data is sequentially unpacked and placed into holding registers.

120

Status

Comms status for the MEM 1 LAST command. 0 = bad, 1 = good.

Last Hourly Data

Table 13: MEM 2 LAST Modbus Register Listing

Holding Register

Address 40,000+

No. of

Registers

Type

Description

121

Time

Year in format YYYY

122

Time

Month and day in format MMDD

123

Time

Hour in format HH

124

Time

Minute and second in format MMSS

125 to 179

Data

Unpacked weather data. Up to 54 “pieces” of comma separated

data is sequentially unpacked and placed into holding registers.

180

Status

Comms status for the MEM 2 LAST command. 0 = bad, 1 = good.

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