WAGO 750-312 User manual

750-312 Modbus Buscoupler
“Getting started”
Application note
A206000, English
Version 1.0.0

ii • General
Application note
A206000
Copyright ã2001 by WAGO Kontakttechnik GmbH
All rights reserved.
WAGO Kontakttechnik GmbH
Hansastraße 27
D-32423 Minden
Phone: [phone] – 0
Fax: [phone] – 1 69
E-Mail: [e-mail]
Web: http://www.wago.com
Technical Support
Phone: [phone] – 5 55
Fax: [phone] – 4 30
E-Mail: [email protected]
Every conceivable measure has been taken to ensure the correctness and com-
pleteness of this documentation. However, as errors can never be fully ex-
cluded we would appreciate any information or ideas at any time.
We wish to point out that the software and hardware terms as well as the
trademarks of companies used and/or mentioned in the present manual are
generally trademark or patent protected.

Table of Contents • iii
Application note
A206000
TABLE OF CONTENTS
1 Important comments..................................................................................1
1.1 Legal principles.................................................................................1
1.1.1 Copyright...........................................................................................1
1.1.2 Personnel qualification......................................................................1
1.1.3 Intended use ......................................................................................1
1.2 Range of validity...............................................................................2
2 Description ..................................................................................................3
3 Reference Material .....................................................................................3
4 Solution........................................................................................................3
4.1 1. Connect the WAGO 750-650........................................................3
4.2 Configure the Buscoupler .................................................................4
4.3 Installation of the WinTech (TM) Modscan software.......................4
4.4 Advanced WAGO Buscoupler configuration utilizing MODBUS
commands while on-line. ................................................................5

iv • Table of Contents
Application note
A206000

Important comments • 1
Application note
A206000
1 Important comments
To ensure fast installation and start-up of the units described in this manual,
we strongly recommend that the following information and explanation is
carefully read and adhered to.
1.1 Legal principles
1.1.1 Copyright
This manual is copyrighted, together with all figures and illustrations con-
tained therein. Any use of this manual which infringes the copyright provisions
stipulated herein, is not permitted. Reproduction, translation and electronic
and photo-technical archiving and amendments require the written consent of
WAGO Kontakttechnik GmbH. Non-observance will entail the right of claims
for damages.
1.1.2 Personnel qualification
The use of the product detailed in this manual is exclusively geared to spe-
cialists having qualifications in PLC programming, electrical specialists or
persons instructed by electrical specialists who are also familiar with the valid
standards. WAGO Kontakttechnik GmbH declines all liability resulting from
improper action and damage to WAGO products and third party products due
to non-observance of the information contained in this manual.
1.1.3 Intended use
For each individual application, the components supplied are to work with a
dedicated hardware and software configuration. Modifications are only admit-
ted within the framework of the possibilities documented in the manuals. All
other changes to the hardware and/or software and the non-conforming use of
the components entail the exclusion of liability on part of WAGO Kon-
takttechnik GmbH.
Please direct any requirements pertaining to a modified and/or new hardware
or software configuration directly to WAGO Kontakttechnik GmbH.

2 • Important comments
Application note
A206000
1.2 Range of validity
This application note is based on the stated hardware and software of the spe-
cific manufacturer as well as the correspondent documentation. This applica-
tion note is therefore only valid for the described installation.
New hardware and software versions may need to be handled differently.
Please note the detailed description in the specific manuals.

Description • 3
Application note
A206000
2 Description
This application describes the operation of the WAGO 750-312 Buscoupler
with the WinTech (TM) Modbus Scanner software. This note also describes a
typical 4 wire connection diagram to a standard RS-232 port utilizing a RS-
232 to RS-485 converter on a DOS based computer running Windows 95 and
NT.
3 Reference Material
WAGO Modbus Manual 750-138
Modbus Protocol (obtained from WAGO application engineers)
Hardware Required
DOS Based Computer with Windows 95 or NT
Modbus Buscoupler 750-312, any I/O and end module 750-600
B&B Electronics RS-232 to RS-485 converter
Misc. cables DB connectors and hoods
4 Solution
4.1 1. Connect the WAGO 750-650
COMPUTER B&B 750-312
RS-232 / 485
Pin to Pin of B&B converter TD(a)------------------------------- 7
TD(b)--------------------------------2
RD(a)--------------------------------8
RD(b)--------------------------------3
SHIELD-----------------------------5
*Note: Utilize the manual provided by WAGO as a reference for
this procedure.

4 • Solution
Application note
A206000
4.2 Configure the Buscoupler
a. Remove the buscoupler plastic housing by using a small
screwdriver to release the tabs on the bottom (metal back) and
slide the large housing off the base.
b. Set the 2 wire/ 4 wire connection switches to 4 WIRE MODE.
c. Set up the dip switches marked FR and P as follows.
Switch P - 1,2,3, Down
4,5,6, UP
7,8 Down
Switch FR - 1,2,3 UP
4,5,6 Down
* this sets the buscoupler for 19.2 K Baud, extended function
mode. Watch dog ON, 3x end of frame, error check ON.
4.3 Installation of the WinTech (TM) Modscan software
* this software can be obtained from: Win Tech Software
P.O. Box 907
Lewisburg, WV 24901
304-645-5966
http://win-tech.com
a. Connect the cable from the B&B converter to COM 2 of your
computer. Run Modscan.
Click on Setup, then Serial, configure the software for COM 2,
19.2KB, Lenght 8, Stop Bit 1, Parity None.
Select OK
Select Action from the menu bar. Select Start Poll. This puts the
buscoupler on line. Verify operation by viewing the Tx and Rx
lights on the WAGO Modbus buscoupler.

Solution • 5
Application note
A206000
b. Force a Digital Output
Click on 00001 <0>, a Write Coil screen will appear. you can now
force the first digital output bit on the WAGO node.
Repeat this for bit 00002 <0>
c. Read a Digital Input
Connect 24VDC to digital input 1 on the WAGO node. Then note
that 00001 <0> will change to 00001 <1>.
Repeat this for bit 00002 <0>
THIS COMPLETES THE BASIC SETUP FOR MODBUS
4.4 Advanced WAGO Buscoupler configuration utilizing
MODBUS commands while on-line.
a. Select Extended from the Menu bar.
Select user defined.
b. This screen allows standard Modbus commands to be sent to the
buscoupler.
The following example sets the WAGO bus coupler for Watchdog
operation with a 17 second communication scan and turns
all outputs to OFF.
From the User Defined Command String screen; place a 06 in the
Function field. Place the hex value of 10,00,00,AA in the Send
Data field(17 second Delay is the AA). Click on Send you can now
see a Check Sum value returned in the Response Buffer of
01,06,10,00,00,AA,0D,75
c. From the User Defined Command String screen; place a 06 in the
Function field. Place the hex value of 10,01,00,FF (watchdog
ON) in the Send Data field. Click on Send you can now see a
Check Sum value returned in the Response Buffer of
01,06,10,01,00,FF,9C,8A
Force a digital output ON and stop communication to the
Buscoupler. The outputs will go to an OFF state after
communications has been broken for 17 Seconds.
NOTE: This procedure is an example of programming the Buscoupler.
The Modbus protocol has many commands that can be utilized with your
system.

WAGO Kontakttechnik GmbH
Postfach 2880 • D-32385 Minden
Hansastraße 27 • D-32423 Minden
Telefon: [phone] – 0
Telefax: 05 71/8 87 – 1 69
E-Mail: [email protected]m
Internet: http://www.wago.com