WAGO 750-651 User manual

Fieldbus Independent
I/O Modules
TTY-Interface 20mA Current Loop
750-651 (/xxx-xxx)
Manual
Version 1.0.2

ii • General
WAGO-I/O-SYSTEM 750
I/O Modules
Copyright 2006 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 Comments ................................................................................. 4
1.1 Legal Principles........................................................................................4
1.1.1 Copyright ............................................................................................. 4
1.1.2 Personnel Qualification ....................................................................... 4
1.1.3 Intended Use ........................................................................................ 4
1.2 Symbols .................................................................................................... 5
1.3 Number Notation...................................................................................... 5
1.4 Safety Notes ............................................................................................. 6
1.5 Scope ........................................................................................................ 6
2I/O Modules ................................................................................................. 7
2.1 Special Modules ....................................................................................... 7
2.1.1 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] ................ 7
2.1.1.1 View................................................................................................ 7
2.1.1.2 Variations........................................................................................ 7
2.1.1.3 Description...................................................................................... 8
2.1.1.4 Display Elements ............................................................................ 9
2.1.1.5 Schematic Diagram......................................................................... 9
2.1.1.6 Technical Data .............................................................................. 10
2.1.1.7 Functional description................................................................... 11
2.1.1.8 Process Image ...............................................................................13
2.1.1.9 Datatransfer................................................................................... 14
2.1.1.9.1 Example....................................................................................15

4 •Important Comments
Legal Principles
WAGO-I/O-SYSTEM 750
I/O Modules
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 explanations are
carefully read and abided by.
1.1 Legal Principles
1.1.1 Copyright
This manual is copyrighted, together with all figures and illustrations
contained 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 & Co. KG. Non-observance will
entail the right of claims for damages.
WAGO Kontakttechnik GmbH & Co. KG reserves the right to perform
modifications allowed by technical progress. In case of grant of a patent or
legal protection of utility patents all rights are reserved by WAGO
Kontakttechnik GmbH & Co. KG. Products of other manufacturers are always
named without referring to patent rights. The existence of such rights can
therefore not be ruled out.
1.1.2 Personnel Qualification
The use of the product detailed in this manual is exclusively geared to
specialists having qualifications in PLC programming, electrical specialists or
persons instructed by electrical specialists who are also familiar with the valid
standards. WAGO Kontakttechnik GmbH & Co. KG 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
permitted 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 Kontakttechnik GmbH & Co. KG.
Please direct any requirements pertaining to a modified and/or new hardware
or software configuration directly to WAGO Kontakttechnik GmbH & Co.
KG.

Important Comments •5
Symbols
WAGO-I/O-SYSTEM 750
I/O Modules
1.2 Symbols
Danger
Always abide by this information to protect persons from injury.
Warning
Always abide by this information to prevent damage to the device.
Attention
Marginal conditions must always be observed to ensure smooth operation.
ESD (Electrostatic Discharge)
Warning of damage to the components by electrostatic discharge. Observe
the precautionary measure for handling components at risk.
Note
Routines or advice for efficient use of the device and software optimization.
More information
References on additional literature, manuals, data sheets and INTERNET
pages
1.3 Number Notation
Number Code Example Note
Decimal 100 normal notation
Hexadecimal 0x64 C notation
Binary '100'
'0110.0100'
Within ',
Nibble separated with dots

6 •Important Comments
Safety Notes
WAGO-I/O-SYSTEM 750
I/O Modules
1.4 Safety Notes
Warning
Switch off the system prior to working on bus modules!
In the event of deformed contacts, the module in question is to be replaced, as
its functionality can no longer be ensured on a long-term basis.
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 additional measures are to be taken:
- installation of the components into an appropriate enclosure
- handling of the components only with clean tools and materials.
Attention
Cleaning of soiled contacts may only be done with ethyl alcohol and leather
cloths. Thereby, the ESD information is to be regarded.
Do not use any contact spray. The spray may impair the functioning of the
contact area.
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 must only be given via a key or tool to authorized qualified
personnel.
The relevant valid and applicable standards and guidelines concerning the
installation of switch boxes are to be observed.
ESD (Electrostatic Discharge)
The modules are equipped with electronic components that may be destroyed
by electrostatic discharge. When handling the modules, ensure that the
environment (persons, workplace and packing) is well grounded. Avoid
touching conductive components, e.g. gold contacts.
1.5 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] • 7
View
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 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: TTY-Interface 750-651 g065100e
2.1.1.2 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

8 • 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] • 9
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
green
Function
on Operational readiness and trouble-
free internal data bus
communication
off Loop current ≤2 mA( SPACE)B
green
TxD
on Loop current ≥12 mA (MARK)
off Loop current ≤2 mA( SPACE)
Fig. 2.1.1-2: Display
Elements g065002x
D
green
RxD
on 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: TTY-Interface 750-651 g065101e

10 • 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 50082-2 (96)
EMC-Emission of interference (CE) acc. to EN 50081-1 (93)
Approvals (cf. Chapter 2.2 of the Coupler/Controller Manual)
CULUS (UL508)
ABS (American Bureau of Shipping)
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)
RINA (Registro Italiano Navale) (only for 750-651)
CULUS (UL1604) Class I Div2 ABCD T4A
KEMA II 3 G EEx nA II T4
Conformity Marking

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 11
Functional description
WAGO-I/O-SYSTEM 750
Busklemmen
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
ELECTRONICC Tools and Docs (Item-No.: 0888-0412)
or in the internet under:
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.
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.

12 • 750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop]
Functional description
WAGO-I/O-SYSTEM 750
Busklemmen
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] • 13
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.

14 • 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] • 15
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"

16 • 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.

750-651 (/xxx-xxx) [TTY-Interface 20mA Current Loop] • 17
Datatransfer
WAGO-I/O-SYSTEM 750
Busklemmen
After the 3 characters have been processed, RA is inverted.
Output byte 0 Control byte Output byte 2 Output byte 1
XX '0XXX.001X' XX XX
If RA≠RR, the receiving of additional characters will continue.
Input byte 0 Statusbyte Input byte 2 Input byte 1
XX '0XXX. 0X1X' XX XX No received data
available.
'O' '0001.0X0X' XX XX The information is in
the input bytes.
After the characters have been processed, RA is inverted.
Output byte 0 Control byte Output byte 2 Output byte 1
XX '0XXX.000X' XX XX
Note
An X indicates that this particular value has no importance.
XX indicates that the whole value has no importance.

WAGO Kontakttechnik GmbH & Co. KG
Postfach 2880 • D-32385 Minden
Hansastraße 27 • D-32423 Minden
Phone: [phone] – 0
Fax: [phone] – 1 69
E-Mail: [email protected]
Internet: http://www.wago.com