WAGO 750-651 User manual

Fieldbus Independent
I/O Modules
TTY-Interface 20mA Current Loop
750-651 (/xxx-xxx)
Manual
Version 1.0.3

ii • General
WAGO-I/O-SYSTEM 750
I/O Modules
Copyright 2008 by WAGO Kontakttechnik GmbH & Co. KG
All rights reserved.
WAGO Kontakttechnik GmbH & Co. KG
Hansastraße 27
D-32423 Minden
Phone: [phone] – 0
Fax: [phone] – 1 69
E-Mail: [email protected]
Web: http://www.wago.com
Technical Support
Phone: [phone] – 5 55
Fax: [phone] – 85 55
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.
E-Mail: [email protected]
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.

Content •iii
WAGO-I/O-SYSTEM 750
I/O Modules
Content
1Important Notes ..........................................................................................4
1.1 Legal Bases...............................................................................................4
1.1.1 Copyright ............................................................................................. 4
1.1.2 Personnel Qualifications......................................................................4
1.1.3 Use of the 750 Series in Compliance with Underlying Provisions .....5
1.1.4 Technical Condition of Specified Devices .......................................... 5
1.2 Standards and Guidelines for Operating the 750 Series...........................6
1.3 Symbols....................................................................................................7
1.4 Safety Information....................................................................................8
1.5 Font Conventions ..................................................................................... 9
1.6 Number Notation......................................................................................9
1.7 Scope ......................................................................................................10
2I/O Modules...............................................................................................11
2.1 Special Modules ..................................................................................... 11
2.1.1 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] .............. 11
2.1.1.1 Variations...................................................................................... 11
2.1.1.2 View..............................................................................................11
2.1.1.3 Description.................................................................................... 12
2.1.1.4 Display Elements .......................................................................... 13
2.1.1.5 Schematic Diagram....................................................................... 13
2.1.1.6 Technical Data .............................................................................. 14
2.1.1.7 Functional description................................................................... 15
2.1.1.8 Process Image ............................................................................... 17
2.1.1.9 Datatransfer................................................................................... 18
2.1.1.9.1 Example....................................................................................19
3Use in Hazardous Environments.............................................................22
3.1 Marking Configuration Examples..........................................................23
3.1.1 Marking for Europe according to CENELEC and IEC ..................... 23
3.1.2 Marking for America according to NEC 500 .................................... 26
3.2 Installation Regulations.......................................................................... 27
3.2.1 Special Conditions for Safe Operation of the ATEX and IEC Ex (acc.
DEMKO 08 ATEX 142851X and IECEx PTB 07.0064).................. 28
3.2.2 Special conditions for safe use (ATEX Certificate TÜV 07 ATEX
554086 X) ..........................................................................................29
3.2.3 Special conditions for safe use (IEC-Ex Certificate TUN 09.0001 X)31
3.2.4 Special conditions for safe use (ATEX Certificate DEKRA
11ATEX0203 X) ............................................................................... 33
3.2.5 ANSI/ISA 12.12.01 ........................................................................... 34

4 •Content
Legal Bases
WAGO-I/O-SYSTEM 750
I/O Modules
1 Important Notes
This section includes an overall summary of the most important safety
requirements and notes that are mentioned in each individual section. To
protect your health and prevent damage to devices as well, it is imperative to
read and carefully follow the safety guidelines.
1.1 Legal Bases
1.1.1 Copyright
This Manual, including all figures and illustrations, is copyright-protected.
Any further use of this Manual by third parties that violate pertinent copyright
provisions is prohibited. Reproduction, translation, electronic and
phototechnical filing/archiving (e.g., photocopying) as well as any
amendments require the written consent of WAGO Kontakttechnik GmbH &
Co. KG, Minden, Germany. Non-observance will involve the right to assert
damage claims.
WAGO Kontakttechnik GmbH & Co. KG reserves the right to provide for any
alterations or modifications that serve to increase the efficiency of technical
progress. WAGO Kontakttechnik GmbH & Co. KG owns all rights arising
from the granting of patents or from the legal protection of utility patents.
Third-party products are always mentioned without any reference to patent
rights. Thus, the existence of such rights cannot be excluded.
1.1.2 Personnel Qualifications
The use of the product described in this Manual requires special personnel
qualifications, as shown in the following table:
Activity Electrical specialist Instructed
personnel*)
Specialists**) having
qualifications in PLC
programming
Assembly X X
Commissioning X X
Programming X
Maintenance X X
Troubleshooting X
Disassembly X X
*) Instructed persons have been trained by qualified personnel or electrical specialists.
**) A specialist is a person, who – thanks to technical training – has the qualification, know-
ledge and expertise to meet the required specifications of this work and to identify any po-
tential hazardous situation in the above listed fields of activity.

Important Notes •5
Legal Bases
WAGO-I/O-SYSTEM 750
I/O Modules
All responsible persons have to familiarize themselves with the underlying
legal standards to be applied. WAGO Kontakttechnik GmbH & Co. KG does
not assume any liability whatsoever resulting from improper handling and
damage incurred to both WAGO´s own and third-party products by
disregarding detailed information in this Manual.
1.1.3 Use of the 750 Series in Compliance with Underlying
Provisions
Couplers, controllers and I/O modules found in the modular WAGO-I/O-
SYSTEM 750 receive digital and analog signals from sensors and transmit
them to the actuators or higher-level control systems. Using programmable
controllers, the signals can also be (pre-)processed.
The components have been developed for use in an environment that meets
the IP20 protection class criteria. Protection against finger injury and solid
impurities up to 12.5 mm diameter is assured; protection against water damage
is not ensured. Unless otherwise specified, operation of the components in wet
and dusty environments is prohibited.
1.1.4 Technical Condition of Specified Devices
The components to be supplied Ex Works, are equipped with hardware and
software configurations, which meet the individual application requirements.
Changes in hardware, software and firmware are permitted exclusively within
the framework of the various alternatives that are documented in the specific
manuals. WAGO Kontakttechnik GmbH & Co. KG will be exempted from
any liability in case of changes in hardware or software as well as to non-
compliant usage of components.
Please send your request for modified and new hardware or software
configurations directly to WAGO Kontakttechnik GmbH & Co. KG.

6 •Content
Standards and Guidelines for Operating the 750 Series
WAGO-I/O-SYSTEM 750
I/O Modules
1.2 Standards and Guidelines for Operating the 750 Series
Please adhere to the standards and guidelines required for the use of your
system:
The data and power lines shall be connected and installed in compliance
with the standards required to avoid failures on your system and to
substantially minimize any imminently hazardous situations resulting in
personal injury.
For assembly, start-up, maintenance and troubleshooting, adhere to the
specific accident prevention provisions which apply to your system (e.g.
BGV A 3, "Electrical Installations and Equipment").
Emergency stop functions and equipment shall not be made ineffective.
See relevant standards (e.g. DIN EN 418).
The equipment of your system shall be conform to EMC guidelines so that
any electromagnetic interferences will be eliminated.
Operating 750 Series components in home applications without further
measures is permitted only if they meet the emission limits (emissions of
interference) in compliance with EN 61000-6-3. You will find the detailed
information in section "WAGO-I/O-SYSTEM 750" "System
Description" "Technical Data".
Please observe the safety precautions against electrostatic discharge in
accordance with DIN EN 61340-5-1/-3. When handling the modules,
please ensure that environmental factors (persons, working place and
packaging) are well grounded.
The valid standards and guidelines applicable for the installation of switch
cabinets shall be adhered to.

Important Notes •7
Symbols
WAGO-I/O-SYSTEM 750
I/O Modules
1.3 Symbols
Danger
Always observe this information to protect persons from injury.
Warning
Always observe this information to prevent damage to the device.
Attention
Marginal conditions that must always be observed to ensure smooth and
efficient operation.
ESD (Electrostatic Discharge)
Warning of damage to the components through electrostatic discharge.
Observe the precautionary measure for handling components at risk of
electrostatic discharge.
Note
Make important notes that are to be complied with so that a trouble-free and
efficient device operation can be guaranteed.
Additional Information
References to additional literature, manuals, data sheets and internet pages.

8 •Content
Safety Information
WAGO-I/O-SYSTEM 750
I/O Modules
1.4 Safety Information
When connecting the device to your installation and during operation, the
following safety notes must be observed:
Danger
The WAGO-I/O-SYSTEM 750 and its components are an open system. It
must only be assembled in housings, cabinets or in electrical operation rooms.
Access is only permitted via a key or tool to authorized qualified personnel.
Danger
All power sources to the device must always be switched off before carrying
out any installation, repair or maintenance work.
Warning
Replace defective or damaged device/module (e.g. in the event of deformed
contacts), as the functionality of field bus station in question can no longer be
ensured on a long-term basis.
Warning
The components are not resistant against materials having seeping and
insulating properties. Belonging to this group of materials is: e.g. aerosols,
silicones, triglycerides (found in some hand creams). If it cannot be ruled out
that these materials appear in the component environment, then the
components must be installed in an enclosure that is resistant against the
above mentioned materials. Clean tools and materials are generally required
to operate the device/module.
Warning
Soiled contacts must be cleaned using oil-free compressed air or with ethyl
alcohol and leather cloths.
Warning
Do not use contact sprays, which could possibly impair the functioning of the
contact area.
Warning
Avoid reverse polarity of data and power lines, as this may damage the
devices.
ESD (Electrostatic Discharge)
The devices are equipped with electronic components that may be destroyed
by electrostatic discharge when touched.

Important Notes •9
Font Conventions
WAGO-I/O-SYSTEM 750
I/O Modules
Warning
For components with ETHERNET/RJ-45 connectors:
Only for use in LAN, not for connection to telecommunication circuits.
1.5 Font Conventions
italic Names of paths and data files are marked in italic-type.
e.g.: C:\Programs\WAGO-IO-CHECK
italic Menu items are marked in italic-type, bold letters.
e.g.: Save
\ A backslash between two names characterizes the selection of a
menu point from a menu.
e.g.: File \ New
END Pushbuttons are marked as bold with small capitals
e.g.: ENTER
< > Keys are marked bold within angle brackets
e.g.: <F5>
Courier The print font for program codes is Courier.
e.g.: END_VAR
1.6 Number Notation
Number code Example Note
Decimal 100 Normal notation
Hexadecimal 0x64 C notation
Binary '100'
'0110.0100'
In quotation marks,
nibble separated with dots (.)

10 •Important Notes
Scope
WAGO-I/O-SYSTEM 750
I/O Modules
1.7 Scope
This manual describes the Digital Input Module 750-651 (/xxx-xxx) TTY-
Interface 20mA Current Loop of the modular WAGO-I/O-SYSTEM 750.
Handling, assembly and start-up are described in the manual of the Fieldbus
Coupler. Therefore this documentation is valid only in the connection with the
appropriate manual.

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 11
Variations
WAGO-I/O-SYSTEM 750
Busklemmen
2 I/O Modules
2.1 Special Modules
2.1.1 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
2.1.1.1 Variations
Item-No. Designation Description
750-651 TTY/ 9600/ N/ 8/ 1 Baud rate: 9600 baud,
Parity: none, data bits: 8, stop bits: 1
750-651/000-001 TTY/ 9600/ N/ 8/ 1/
5 byte
Baud rate: 9600 baud,
Parity: none, data bits: 8, stop bits: 1,
user data: 5 byte
750-651/000-002 TTY/ 9600/ E/ 8/ 1 Baud rate: 9600 baud,
Parity: even, data bits: 8, stop bits: 1
750-651/000-003 TTY/ 1200/ N/ 8/ 1 Baud rate: 1200 baud,
Parity: none, data bits: 8, stop bits: 1
2.1.1.2 View
TxD
RxD
13 14
C
D
B
A
750-651
TxD
RxD
__
__
TxD
Data contacts
RxD
RxD
TxD
Function
TxD
RxD
___
___
Receiver
Transmitter
Fig. 2.1.1-1: View g065100e

12 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Description
WAGO-I/O-SYSTEM 750
Busklemmen
2.1.1.3 Description
This interface allows the connection of devices which are equipped with a
20 mA current interface.
The wiring to the communication partner is made by the connections TxD,
/TxD, RxD and /RxD.
The interface is working in active, semi-active or passive operation mode. The
module communicates with the control unit over the fieldbus coupler/-
controller.
The active communication channel works independently of the higher-level
fieldbus system and allows full duplex operation up to 19200 baud.
Three green LEDs signal readiness for operation and troublefree internal bus
communication as well as the condition of the signal transmission.
The TTY interface guarantees high interference immunity because of the
electrical isolation and the driven loop current.
Any configuration of the specialty modules is possible when designing the
fieldbus node. Grouping of module types is not necessary.
Attention
This module has no power contacts. For field supply to downstream I/O
modules, a supply module will be needed.
The TTY-Interface module 750-651 and its variations can be used with all
couplers/controllers of the WAGO-I/O-SYSTEM 750 (except for the economy
types 750-320, -323, -324 and -327).
This description is valid from hardware and software version XXXX3A03...
and up. The version is specified in the manufacturing number, which is part of
the lateral marking on the module.

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 13
Display Elements
WAGO-I/O-SYSTEM 750
Busklemmen
2.1.1.4 Display Elements
LED Channel State Function
off No operational readiness or the
internal data bus communication is
interrupted
A Function
green Operational readiness and trouble-
free internal data bus
communication
off Loop current ≤2 mA( SPACE)B TxD
green Loop current ≥12 mA (MARK)
off Loop current ≤2 mA( SPACE)
Fig. 2.1.1-2: Display
Elements g065002x
D RxD
green Loop current ≥12 mA (MARK)
2.1.1.5 Schematic Diagram
TxD TxD
RxD RxD
TxD
TxD
TxD
RxD
RxD
RxD
Function
Logic
TTY
___
___
___
___
1
2
3
4
5
6
7
8
750-651
Fig. 2.1.1-3: Schematic Diagram g065101e

14 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Technical Data
WAGO-I/O-SYSTEM 750
Busklemmen
2.1.1.6 Technical Data
Module Specific Data
Transmission channel 1 TxD / 1 RxD, full duplex
Baud rate 1200 ... 19200 baud
Bit transmission MARK: I ≥12 mA, SPACE: I ≤2 mA
Load impedance < 500 Ω
Line length max. 1,2 kBd
≤800 m
2,4 kBd
≤400 m
9,6 kBd
≤100 m
Buffer 128 bytes in / 16 bytes out
Current consumption (internal) 55 mA
Voltage supply via system voltage DC/DC
Isolation 500 V (System/Supply)
Bit width 1 x 40 bits data
1 x 8 bits control/status
Dimensions (mm) W x H x L 12 x 64* x 100
* from upper edge of 35 DIN rail
Weight ca. 55 g
Standards and Regulations (cf. Chapter 2.2 of the Coupler/Controller Manual)
EMC-Immunity to interference (CE) acc. to EN 61000-6-4: 2007
EMC-Emission of interference (CE) acc. to EN 61000-6-2: 2005
EMC marine applications-Immunity to
interference
acc. to Germanischer Lloyd (2003)
EMC marine applications- Emission to
interference
acc. to Germanischer Lloyd (2003)
ATEX guideline Acc. to EN 60079-0:2006 and
acc. to EN 60079-15:2005
Approvals
CULUS (UL508)
ABS (American Bureau of Shipping) (only for 750-651)
BV (Bureau Veritas)
DNV (Det Norske Veritas) Cl. B
GL (Germanischer Lloyd) Cat. A, B, C, D
KR (Korean Register of Shipping)
LR (Lloyd's Register) Env. 1, 2, 3, 4
NKK (Nippon Kaiji Kyokai)
PRS (Polski Rejestr Statków)

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 15
Functional description
WAGO-I/O-SYSTEM 750
Busklemmen
RINA (Registro Italiano Navale) (only for 750-651)
CULUS (ANSI/ISA 12.12.01) Class I Div2 ABCD T4
Conformity Marking
DEKRA
II G Ex nA II T4
Only for 750-651, 750-
651/000-001, 750-651/000-
002, 750-651/000-003
More Information
Detailed references to the approvals are listed in the document "Overview
Approvals WAGO-I/O-SYSTEM 750", which you can find on the CD-ROM
"AUTOMATION Tools and Docs" (Item-No.: 0888-0412)
or in the internet under: http://www.wago.com Documentation 
WAGO-I/O-SYSTEM 750 System Description
2.1.1.7 Functional description
The interface module is designed to operate with all WAGO I/O fieldbus
couplers. The TTY interface module allows the connection of TTY-Interface
devices to the WAGO I/O SYSTEM. The TTY Interface module can provide
gateways within the fieldbus protocol. This allows serial equipment such as
printers, barcode readers, and links to local operator interfaces to
communicate directly by the fieldbus protocol with the PLC or PC Master.
This module supports no higher level of protocol. Communication is made
completely transparent to the fieldbus allowing flexibility in further
applications of the serial interface module. The communication protocols are
configured at the Master PLC or PC.
The 128 byte input buffer provides for high rates of data transmission. When
using lower rates of transmission speed you can collect the received data, with
less priority, without loosing data.
The 16 byte output buffer provides for faster transmission of larger data
strings.

16 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Functional description
WAGO-I/O-SYSTEM 750
Busklemmen
Attention
The data transmission takes place at 9600 baud (default value). 1 startbit, 8
databits and 1 stopbit will be transmitted. No parity is available. The drivers
are high ohmic. The control of data is made by the user software.
Attention
The TTY Interface is passive in sending and receiving , thus having no
current sources. For data conversion an active partner is needed or an
additional current source has to be connected.
Point to point connection
with active partners
Point to point connection with passive
partners and additional current sources
Bus connection with a current source
and a passive module
Receiver Receiver
Transmitter Transmitter
Receiver with
Transmitter with
current source
Current source Current source
Current source
current source
20 mA
20 mA
20 mA
20 mA
20 mA
TxD
RxD
13 14
C
D
B
A
750-651
TxD
RxD
__
__
TxD
RxD
13 14
C
D
B
A
750-651
TxD
RxD
__
__
TxD
RxD
13 14
C
D
B
A
750-651
TxD
RxD
__
__
Fig. 2.1.1-4: Employment of the TTY interface module g065102e

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 17
Process Image
WAGO-I/O-SYSTEM 750
Busklemmen
2.1.1.8 Process Image
Using the module 750-651, a 6 byte input and output process image can be
transferred to the fieldbus coupler / controller via one logical channel. The
transfer of the data to be transmitted and the received data is made via 5
output and 5 input bytes (D0 ... D4). 1 Control byte (C) and 1 Status byte (S)
are used to control the floating data..
Attention
The representation of the process data of some I/O modules or their variations
in the process image depends on the fieldbus coupler/-controller used. Please
take this information as well as the particular design of the respective
control/status bytes from the section "Fieldbus Specific Design of the Process
Data" included in the description concerning the process image of the
corresponding coupler/controller.
Up to 5 characters which have been received via interface can be stored in the
input bytes. The output bytes will contain the characters to be sent.
Input data Output data
S Status byte C Control byte
D0 Input byte 0 D0 Output byte 0
D1 Input byte 1 D1 Output byte 1
D2 Input byte 2 D2 Output byte 2
D3 Input byte 3 *), **) D3 Output byte 3 *), **)
D4 Input byte 4 **) D4 Output byte 4 **)
*) with variations with 4 Data bytes, **) with variations with 5 Data bytes
Control byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 OL 2 OL 1 OL 0 0 IR RA TR
TR Transmit request
RA Receive acknowledge
IR Initialization request
OL 0,
OL 1,
OL 2
Output length (number of characters to be sent, which have been stored in the
output bytes)
0 Constant value must always be 0.

18 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Datatransfer
WAGO-I/O-SYSTEM 750
Busklemmen
Status byte
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 IL 2 IL 1 IL 0 BUF_F IA RR TA
TA Transmit acknowledge
RR Receive request
IA Initialization acknowledge
BUF_F Buffer full
IL 0,
IL 1,
IL 2
Input length (number of received characters , which have been stored in the
input data)
0 Constant value must always be 0.
2.1.1.9 Datatransfer
With the control and status byte the controlling of the sending and receive
mode takes place. Requests are indicated by a bit change of state. An assigned
bit indicates execution by adopting the value of the request bit.
Initialization of the module:
Set IR bit in the control byte
Initialization of the module
Transmit/receive functions are blocked
Output/input buffers are erased
Serial interface module will load its configuration data
Transmitting data:
TRTA: put characters into output bytes
Amount of characters is specified in OL0 to OL2
TR is inverted and read out
Characters are put into output buffer if TR=TA
Receiving data:
RRRA: data in input bytes characters are available
Amount of characters is specified in IL0 to IL2
Characters in IL0 to IL2 are read out
RA is inverted and read out
All characters are read when RR=RA

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 19
Datatransfer
WAGO-I/O-SYSTEM 750
Busklemmen
The transmitting and receiving of data can be done simultaneously. The
initialization request has priority and will stop transmitting and receiving of
data immediately.
Attention
Resetting the initialization bit can be performed with the following message.
Message: input buffer full (Bit 3)
Input buffer is full. Data which is being currently received is now lost.
2.1.1.9.1 Example
The module is initialized.
The initialization bit in the control byte is set.
Output byte 0 Control byte Output byte 2 Output byte 1
0x00 '0000.0100' 0x00 0x00
After the initialization has been executed, the status byte will give back
000.0100.
Input byte 0 Statusbyte Input byte 2 Input byte 1
XX '0XXX. X0XX' XX XX Module is still being
reset.
XX '0XXX. X1XX' XX XX Initialization
completed.
Sending of the data string "Hello”
The first 3 characters and the buffer length of 3 are transmitted.
Output byte 0 Control byte Output byte 2 Output byte 1
"H" (0x48) '0011.0000' "1" (0x6C) "a" (0x60)
The transmission request bit (TR) is inverted.
Output byte 0 Control byte Output byte 2 Output byte 1
"H" '0011.0001' "1" "a"

20 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Datatransfer
WAGO-I/O-SYSTEM 750
Busklemmen
As soon as TR=TA, the rest of the data can be sent.
Input byte 0 Statusbyte Input byte 2 Input byte 1
XX '0XXX.XXX0' XX XX The data is still
being transferred.
XX '0XXX.XXX1' XX XX Data transfer
completed.
The last 2 characters and the buffer length of 2 are transmitted.
Output byte 0 Control byte Output byte 2 Output byte 1
"1" '0010.0001' XX "o" (0x6F)
The transmission request bit (TR) is inverted.
Output byte 0 Control byte Output byte 2 Output byte 1
"1" '0010.0000' XX "o"
As soon as TA = TR, the data has been transferred to the output buffer.
Input byte 0 Statusbyte Input byte 2 Input byte 1
XX '0XXX. XXX1' XX XX The data is still
being transferred.
XX '0XXX. XXX0' XX XX Data transfer
completed.
Receiving the character chain "WAGO”
As soon as RARR, the input bytes contain data.
Output byte 0 Control byte Output byte 2 Output byte 1
XX '0XXX.000X' XX XX
Input byte 0 Statusbyte Input byte 2 Input byte 1
XX '0XXX. 0X0X' XX XX No received data
available..
"W" '0011.0X1X' "G" "A" The information is in
the input bytes.