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Identifies information about practices or
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!
ATTENTION
Identifies information about practices or
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!
IMPORTANT
Identifies information that is critical for successful
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Preface
Purpose of This Manual
Who Should Use
This Manual
This manual describes how to install, configure, and troubleshoot
your POINT I/O 1734-232ASC module (for the RS-232 network) or
1734-485ASC module (for the RS-485 or RS-422 network).
For Information onSee
Chapter/
Appendix
Installing the ASCII Module1
Configuring Your ASCII Module2
Diagnostics3
SpecificationsA
You must be able to use RSNetWorx for DeviceNet software or similar
configuration software to set this module. You must have the
capability to download and use Electronic Data Sheet (EDS) files.
We assume you know how to do this in this manual. If you do not,
refer to your software user manuals or online help before attempting
to use this module.
1Publication 1734-UM009B-EN-P - July 2003
Preface 2
Related Products and
Documentation
The following table lists related POINT I/O products and
documentation.
Catalog NumberDescriptionRelated Publications
Communication
Adapter
Communication
Interface
1734D Series1734D Series 24V dc 8 In/8 Out Combo Module (Cat. No. 1734D-IB8XOB8E,
1734D Series 24V dc 8 In/8 N.O. Relay Combo Module (Cat. No.
1734D Series 120V ac 8 In/8 Out Combo Module (Cat. No. 1734D-IA8XOA8,
1734D Series 120V ac 8 In/8 N.O. Relay Combo Module (Cat. No.
Wiring Base
Assemblies
AC Modules120V ac 2 Input Module (Cat. No. 1734-IA2)Installation Instructions1734-IN010
Wiring Base Assembly with 8 Screw-Clamp or Spring-Clamp Removable
Wiring Base Assembly with 12 Screw-Clamp or Spring-Clamp Removable
Installing the Mounting
Base/ Wiring Base
Assembly
The ASCII modules provide a flexible DeviceNet interface to a wide
variety of RS-232, RS-485, and RS-422 ASCII devices. The modules
provide the communication connections to the ASCII device.
The 1734-232ASC module connects to the RS-232 network while the
1734-485ASC module connects to the RS-485 or RS-422 network.
The wiring base assembly (1734-TB or -TBS) consists of a mounting
base (cat. no. 1734-MB) and a removable terminal block (cat. no.
1734-RTB or -RTBS). You can install the assembly, or just the
mounting base. To install the mounting base/wiring base assembly on
the DIN rail, proceed as follows.
ATTENTION
!
POINT I/O is grounded through the DIN rail to
chassis ground. Use zinc-plated, yellow-chromated
steel DIN rail to assure proper grounding. Using
other DIN rail materials (e.g. aluminum, plastic, etc.)
which can corrode, oxidize or are poor conductors,
can result in improper or intermittent platform
grounding.
WARNING
!
1Publication 1734-UM009B-EN-P - July 2003
When you connect or disconnect the Removable
Terminal Block (RTB) with field side power applied,
an electrical arc can occur. This could cause an
explosion in hazardous location installations.
Be sure that power is removed or the area is
nonhazardous before proceeding.
1-2 Installing the ASCII Module
1. Position the mounting base/wiring base assembly vertically
above the installed units (adapter, power supply or existing
module).
2. Slide the mounting base down allowing the interlocking side
pieces to engage the adjacent module or adapter.
Slide-in Writable Label
1734
232ASC
Module Locking Mechanism
Insertable I/O Module
Module Wiring Diagram
Module
Status
Network
:
Status
E
D
O
N
TX
RX
Mechanical Keying
(orange)
DIN Rail Locking Screw
(orange)
RTB Removing Handle
Removable Terminal Block (RTB)
Interlocking Side Pieces
Mounting Base
3. Press firmly to seat the mounting base on the DIN rail. The
mounting base will snap into place.
4. To remove the mounting base from the DIN rail, remove any
installed module (and any module immediately to the right), and
use a small bladed screwdriver to rotate the DIN rail locking
screw to a vertical position. This releases the locking
mechanism. Then lift straight up to remove the mounting base.
Publication 1734-UM009B-EN-P - July 2003
5. Repeat this procedure for the next mounting base assembly.
Installing the ASCII Module 1-3
Installing an I/O Module
The module can be installed before, or after base installation. Make
sure that the mounting base is correctly keyed before installing the
module into the mounting base. In addition, make sure the mounting
base locking screw is positioned horizontal referenced to the base.
WARNING
When you insert or remove the module while
backplane power is on, an electrical arc can occur.
This could cause an explosion in hazardous location
installations.
!
Be sure that power is removed or the area is
nonhazardous before proceeding.
1. Using a bladed screwdriver, rotate the keyswitch on the
mounting base clockwise till the number required for the type of
module being installed aligns with the notch in the base.
Turn the keyswitch to align
the number with the notch.
Position 2
Notch
(position 3 shown)
2. Make certain the DIN rail
locking screw is in the
horizontal position. (You
cannot insert the module if
the locking mechanism is
unlocked.)
3. Insert the module straight down into
the mounting base and press to
secure. The module will lock into
place.
Make sure the DIN rail
locking screw is in the
horizontal position.
ule
s
od
M
tatu
S
Network
:
Status
E
D
O
N
24VDC
Source
Output
0
1
2
3
1734
OB4E
Publication 1734-UM009B-EN-P - July 2003
1-4 Installing the ASCII Module
Installing the Removable
Terminal Block
A removable terminal block is supplied with your mounting base
assembly. To remove, pull up on the RTB handle. This allows the base
to be removed and replaced as necessary without removing any of the
wiring. To reinsert the removable terminal block, proceed as follows.
1. Insert the RTB end opposite the handle into the base unit. This
end has a curved section that engages with the mounting base.
Hook the RTB end into
the mounting base end,
and rotate until it locks
into place.
WARNING
When you connect or disconnect the Removable
Terminal Block (RTB) with field side power applied,
an electrical arc can occur. This could cause an
explosion in hazardous location installations.
!
2. Rotate the terminal block into the mounting base until it locks
itself in place.
3. If an I/O module is installed, snap the RTB handle into place on
the module.
Be sure that power is removed or the area is
nonhazardous before proceeding.
Publication 1734-UM009B-EN-P - July 2003
Installing the ASCII Module 1-5
Removing a Mounting Base
To remove a mounting base, you must remove any installed module,
and remove the removable terminal block (if wired).
1. Unlatch the RTB handle on the I/O module.
2. Pull on the RTB handle to remove the removable terminal block.
WARNING
!
3. Press in on the module lock on the top of the module and pull
up on the I/O module to remove from the base.
WARNING
When you connect or disconnect the Removable
Terminal Block (RTB) with field side power applied,
an electrical arc can occur. This could cause an
explosion in hazardous location installations.
Be sure that power is removed or the area is
nonhazardous before proceeding.
When you insert or remove the module while
backplane power is on, an electrical arc can occur.
This could cause an explosion in hazardous location
installations.
!
4. Remove the module to the right of the base you are removing.
(The interlocking portion of the base sits under the adjacent
module.)
5. Use a small bladed screwdriver to rotate the orange DIN rail
locking screw on the mounting base to a vertical position. This
releases the locking mechanism.
6. Then lift the mounting base straight up to remove.
Be sure that power is removed or the area is
nonhazardous before proceeding.
Publication 1734-UM009B-EN-P - July 2003
1-6 Installing the ASCII Module
Wiring the
1734-232ASC Module
RS-232
Module Status
Network Status
Module
Status
Network
Status
NODE:
1734
232ASC
1734
232ASC
TxD
RxD
Tx
NC
NC
NC
Tx = TransmitRx = Receive
NC = No ConnectionSG = Signal Ground
Shielded Cable: The 1734-232ASC module
requires shielded cable to help reduce the
effects of electrical noise coupling. Ground
each shield at one end only. A shield grounded
at both ends forms a ground loop, which can
cause module communications to fault. Never
connect a shield to the common side of a logic
circuit (this would introduce noise into the
logic circuit).
Connect the shield directly to a chassis ground.
This chassis ground connection is not available
on the 1734-232ASC RTB (Removable Terminal
Block). On a POINT I/O system, the chassis
ground connection can be made at the DIN
Rail, at the metal panel the DIN Rail is
mounted to, or at the user’s I/O device.
Rx
NC
NC
SG
43123
Wiring the
1734-485ASC Module
RS-485
Module
Status
Network
Status
S+
S-
NC
CG
S+ = TransmitS- = Receive
CG = Chassis GroundNC = No Connection
SG = Signal Ground
Shielded Cable: The 1734-485ASC module requires
shielded cable to help reduce the effects of electrical
noise coupling. Ground each shield at one end only. A
shield grounded at both ends forms a ground loop, which
can cause module communications to fault. Never connect
a shield to the common side of a logic circuit (this would
introduce noise into the logic circuit).
Connect the shield directly to a chassis ground. This
chassis ground connection is not available on the
1734-485ASC RTB (Removable Terminal Block). On a
POINT I/O system, the chassis ground connection can be
made at the DIN Rail, at the metal panel the DIN Rail is
mounted to, or at the user’s I/O device.
NC
NC
NC
SG
RS-422
Module
Status
Network
Status
Tx+
Tx-
NC
CG
Tx = TransmitRx = Receive
CG = Chassis GroundNC = No Connection
SG = Signal Ground
Rx+
Rx-
NC
SG
4348743487
Publication 1734-UM009B-EN-P - July 2003
Installing the ASCII Module 1-7
Module Terminations
TerminalRS-232RS-485RS-422
0Tx
1
1Rx2NCRx+
2NCS-2Tx3NCNCRx-
S+
1
Tx+
1
1
2
2
4 NCNCNC
5 NCNCNC
6NCCGCG
7SGSGSC
1 S+ and Tx+ are transmit from the module
2 S- and Rx- are receive into the module
RS-422RS-485RS-232
1
0
Tx
Rx
1
0
S+
NC
1
0
Tx+
Rx+
23
NC
NC
45
6
NC
NC
NC
7
SG
23
S-
NC
45
6
43124
Tx, S+ = TransmitRx, S- = Receive
NC = No ConnectionSG = Signal Ground
CG = Chassis Ground
NC
CG
NC
7
SG
43488
23
Tx-
Rx-
45
6
NC
CG
NC
7
SG
43489
Publication 1734-UM009B-EN-P - July 2003
1-8 Installing the ASCII Module
Cable Pinouts for
Standard DB Connectors
How to Install a Serial
Network
Table 1.1 ASCII Functions
Pin Number
FunctionDB-25DB-9
Transmit Data (TXD)23
Receive Data (RXD)32
Signal Ground (SG)75
The communication between your serial device(s) and the:
· 1734-232ASC is an RS-232 3-wire network.
· 1734-485ASC is an RS-485 2-wire network
or RS-422 4-wire network
1. Connect an appropriate cable to your device.
2. Connect the other end of the cable to the ASCII module using
the designated positions on the 1734-TB terminal block.
Notice the terminal markings on the ASCII module case.
3. Turn on power to the serial device and the ASCII module.
4. Set up the ASCII buffer sizes on the ASCII module.
The defaults are 20 and 20. If more than 20 bytes are required
for the transmit or receive buffers, set the appropriate
parameters in your configuration file to the buffer size you need
for your ASCII data.
This will modify the I/O message size. You will need to
reconfigure the poll/COS/cyclic transmit and receive data sizes if
you modify the ASCII buffer size from the default value.
In many configuration tools, this will unmap the data in your
scanner’s scan list. They must be remapped in order to process
the data in your PLC or PC software. These values are displayed
in the Parameter Object, Class 15 (F
hex
).
Publication 1734-UM009B-EN-P - July 2003
Installing the ASCII Module 1-9
5. The ASCII module produces and consumes the number of ASCII
characters selected plus four.
These produce and consume sizes are presented for your
information in parameters 13 and 23, respectively.
How to Read Serial Device
Input Data from the
ASCII Module
TIP
1. Connect to the ASCII module from your configuration tool.
2. Connect the serial side of the ASCII module to your computer’s
serial port or another serial device.
3. Go to the device configuration screen in the configuration tool.
4. Make sure that the ASCII module is in the default factory
configuration.
5. Set the baud rate and framing format of the serial port to the
baud rate and framing format of the serial device that you are
using.
6. Put the configuration tool in monitor mode.
7. Direct the device that you are communicating with to send data.
Make sure that you set up your scanner to the
correct sizes using this data.
For example, if you are connected to a computer terminal
program, type a message into the terminal. When you hit enter,
the module will update the data with the message that you
typed, and increment the transaction ID.
The default assembly of the poll response message is shown
below.
Table 1.2 Default Receive Data Assembly Format (Default Mode)
Byte 1Byte 2Byte 3Byte 4Byte 5-23Byte 24
RX Transaction ID
Byte
Status ByteReservedLengthASCII Data<CR>
Publication 1734-UM009B-EN-P - July 2003
(Terminator)
1-10 Installing the ASCII Module
How to Write Serial Output
Data to the ASCII Module
1. Connect to the ASCII module from your configuration tool.
2. Connect the serial side of the ASCII module to your computer’s
serial port or another serial device.
3. Go to the device configuration screen in the configuration tool.
4. Make sure that the ASCII module is in the default factory
configuration.
5. Set the baud rate and framing format of the serial port to the
baud rate and framing format of the serial device that you are
using.
6. Enter the serial data that you wish to send in the transmit data
parameter and choose apply.
7. Change the length of the data in the length byte to reflect the
length you wish to send and choose apply.
8. Change the transmit transaction ID and choose apply.
The ASCII module will generate the characters you typed on the
computer screen.
Poll messages work in the same manner as the parameter object
interface.
Table 1.3 Default Transmit Data Assembly Format (Default Mode)
Byte 1Byte 2Byte 3Byte 4Byte 5-23Byte 24
Reserved TX Transaction ID
Byte
ReservedLengthASCII Data<CR>
(Terminator)
Publication 1734-UM009B-EN-P - July 2003
Installing the ASCII Module 1-11
Setting Up DeviceNet
Communications
The ASCII module supports 4 modes of data transfer of the serial
buffer:
· Polled I/O
· Change of State I/O
· Cyclic I/O
· Explicit Message
Polled I/O
The ASCII module monitors the transaction ID for a change in the
transaction ID. If the transaction ID changes, then the ASCII module
transmits the data buffer on its serial link. If the transaction ID does
not change, then the device does not transmit the data buffer.
After the device has transmitted its data out to the serial link, the ASCII
module then takes any information that is stored in its current serial
input buffer and sends this data to the DeviceNet master. It sends all
characters up to and including the received delimiter, including pad
characters if not deselected.
When the ASCII module receives a new message (either with a
delimiter or with an overflow condition without a delimiter) the
device then increments the receive record, updates the length byte,
and copies the new information from the last receive delimiter into
the buffer. If an overflow occurs, the ASCII module indicates so in its
receive status bit. The receive status byte also reflects parity errors in
the device.
Publication 1734-UM009B-EN-P - July 2003
1-12 Installing the ASCII Module
Cyclic and Change of State I/O
The Cyclic and Change of State (COS) connections initiate a
DeviceNet message (production) every time the connection timer
(EPR) expires. They report the most current data in the ASCII
module’s serial port receive buffer. In addition, the COS sends a data
string each time a new serial input is received from the external serial
device. This initiates the data transfer upon receipt of the delimiter or
an overflow at its serial port.
The format of the message is the same as for a Poll response. Each
message is handled in the same fashion, with respect to string
delimiters, overflows, etc., regardless of which connection mechanism
is used.
The purpose of these connections is to send data from the ASCII
modules to the scanner without a direct command from the Master,
thus conserving network bandwidth. The COS connection provides
the Master with the current data as fast (or faster) than a Poll
connection. The COS/Cyclic mechanism automatically activates when
the connection is created.
The COS and Cyclic connections are mutually exclusive per DeviceNet
definition - that is, you cannot use both of them at the same time. You
can use each one, however, in conjunction with a Poll connection.
Setting Up the DeviceNet I/O Connections
It is useful to first set up your serial link before setting up your
connection. To set up the communications with your network
configuration tool, it is necessary to know the connection input and
output sizes. Instructions for setting up your serial connection are
provided above. See Table 2.3 for receive and transmit sizes.
The input and output sizes are computed from the transmit size and
the receive sizes plus selected options. These sizes are defined in the
parameter object of your device.
Publication 1734-UM009B-EN-P - July 2003
Installing the ASCII Module 1-13
The transmit and receive sizes of the I/O connection are automatically
computed for you by the ASCII module. You must set the maximum
RX and TX sizes first and then choose apply. Upload the data to the
ASCII module by clicking Upload. The scanner’s I/O connection TX
field should be set to the value of "Consume Assembly Size"
parameter 23.
The RX size of the scanner should be set to the value of "Produce
Assembly Size" parameter 13. If you are in the COS I/O connection
and do not wish to transmit data out of the ASCII module, you may
set the scanner’s TX size to 0. This will only work with the COS/cyclic
connection. You will see the best results if you do not allocate the poll
and COS connections at the same time (you will conserve bandwidth).
The best selection in regards to bandwidth conservation is the COS
connection.
IMPORTANT
Remember to re-map the data (if necessary) after you
set the sizes, because many configuration tools will
automatically unmap your data when you change the
connection sizes. If you are not using such a
software package, it is probably not necessary to set
up the transmit and receive sizes.
Setting Up the Connection Timer (EPR)
EPR stands for Expected Packet Rate. This is the timer value that the
ASCII module uses for the cyclic and polled connection. This is also
the value it uses in the connections to calculate the time the device
should wait before signaling a timeout. If you have a scanner or
scanning software, you must configure it with the EPR that you want
the ASCII module to be scanned with.
The scanner configures the EPR in the ASCII module at the
beginning of communications. Consult your scanner’s manuals on
how to configure the EPR.
TIP
EPR is automatically set via RSNetWorx for
DeviceNet. However, if you need to set up the EPR
manually, perform a set (Service 10
connection class (Class 5
) attribute 9. The polled
hex
) on the
hex
connection uses instance 2, where as the COS and
cyclic connections use instance 4. This must be done
after allocating the connection.
Publication 1734-UM009B-EN-P - July 2003
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