Rockwell Automation Samsung NX70 User manual

NX70/NX700 Serial Communications Unit (SCU)
User Manual
www.DataSheet4U.com
( DataSheet : www.DataSheet4U.com )

Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Because of these differences, and also because of the
wide variety of uses for solid state equipment, all persons responsible for applying
this equipment must satisfy themselves that each intended application of this
equipment is acceptable.
In no event will Rockwell Samsung Automation be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative
purposes. Because of the many variables and requirements associated with any
particular installation, Rockwell Samsung Automation cannot assume responsibility
or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Samsung Automation. with respect to use
of information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written
permission of Rockwell Samsung Automation. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
WARNING Identifies information about practices or circumstances which may
lead to serious personal injury or death, property damage, or
economic loss.
IMPORTANT Identifies information that is critical for successful application and
understanding of the product.
ATTENTION Identifies information about practices or circumstances that can lead
to minor personal injury, property damage, economic loss, or
product malfunction. However, depending on circumstances, failure
to follow the directions accompanying this symbol may also lead to
serious consequences.

3
Contents
1. Specifications and Components ................................. 9
SCU Features .................................................................................................. 9
System Configuration................................................................................... 10
Specifications ................................................................................................ 11
Unit Diagram ................................................................................................. 12
Operation Status Display and Functions .................................................... 13
DIP Switch Settings ...................................................................................... 14
2. Wiring........................................................................ 17
Wiring ............................................................................................................ 17
3. Operations and Programming Examples................... 19
Basic Operations ........................................................................................... 19
Precautions for SCU Operation ................................................................... 20
Programming ................................................................................................ 22
NX70, NX700 PLC Installation Example...................................................... 33
PLC Programming Examples....................................................................... 34
Troubleshooting............................................................................................ 47
4. Product Dimensions and Installation........................ 51
NX700 PLC Product Dimensions ................................................................. 51
NX70 PLC Product Dimensions ................................................................... 53
Power Unit Dimensions(mm) ...................................................................... 54

4

5
Safety Instructions
Please read this manual and the related documentation thoroughly
and familiarize yourself with product information, safety instructions
and other directions before installing, operating, performing
inspection and preventive maintenance. Make sure to follow the
directions correctly to ensure normal operation of the product and
your safety. Otherwise it may cause overheating and product
WARNING • If this product is used in a situation that may cause
personal injury and/or significant product damage,
implement safe measures such as use of fault-safe
equipment.
• Do not use this product under any conditions exposed
to explosive gases. It may cause an explosion.
ATTENTION • Make sure to use an external device when configuring
the protective circuit breakers for emergencies or
interlock circuits.
• Fasten the terminal screws tightly to ensure that the
cable connection is secure. Incorrect cable connection
may cause overheating and product malfunction.
• Operate and keep the product under the allowed
conditions directed in product specifications.
Otherwise it may cause overheating and product
malfunction.
• Do not disassemble or remodel the product.
Otherwise it may cause an electric shock or
malfunction.
• Do not touch the terminals when the power is on.
Otherwise it may cause an electric shock.

6
Installation Environment for SCU (Serial
Communication Unit)
ATTENTION Do not install your analog conversion modules if any of
the following conditions are present:
• Ambient temperature outside the range of 0 to 55 °C
(32 to 131 °F).
• Direct sunlight.
• Humidity outside the range of 30% to 85% (Non-
condensing).
• Chemicals that may affect electronic parts.
• Excessive or conductive dust, or salinity.
• High voltage, strong magnetic fields, or strong
electromagnetic influences.
• Direct impact and excessive vibration.
ATTENTION Installing the SCU Module on the System
1. Connect a communication cable to the SCU module.
2. Turn on the power to the external device connected
to the SCU module.
3. Turn on the main PLC power.
ATTENTION Removing the SCU Module from the System
1. Turn off the main PLC power.
2. Turn off the power to the external device connected
to the SCU module.
3. Remove the communication cable.

7
ATTENTION Preventing SCU Module Malfunctions
• Be sure to power off the PLC system before installing
or removing an SCU module.
• Ensure that the SCU module is secured onto the
backplane before operating it.
• Be cautious of metal chips when wiring for the SCU
module. Metal chips and debris that fall into the
module can cause damage.
• Do not touch with your hand the connector on the
bottom of the module which is used to connect to the
backplane . Otherwise, it can cause connection fault
and static electrical discharges.
• Do not drop or impose impact to the SCU module. It
can cause damage because the housing is made of
injection-molded plastics.
ATTENTION Preventing PLC System Malfunctions
• Use an isolation transformer and line filter on the
incoming power to the PLC when there is equipment
using or producing high current, high voltage, or
large magnetic fields in the vicinity.
• Use analog sensor that meets the rated specifications
for module connection. Otherwise,
it may cause operation errors.
• Separate the main PLC power line ground from all
other power grounds. Always use class 3 grounding.
• Do not exceed the current and power rating of the
external 24 VDC provided by the PLC power supply.
• Avoid system faults due to programming errors by
reading and fully understanding this system manual
and the PLC instruction set.
• Perform regular preventive maintenance on installed
systems, checking devices and wiring for potential
breakdowns and failures.

8

9
1
Specifications and Components
Exchange data with RS232C or RS485 communication devices, such as
barcode reader (RS232C) and network inverter (RS458). ASCII and HEX
(Binary) data transfer is enabled with ladder program. (SCU unit = the
existing features of SDU unit + 485 communication)
SCU Features
1. Two channels are implemented on a single unit (RS232C, RS485
selectable).
2. Data input/output with simple sequence instructions.
Use PLC advanced instruction READ to read data from the SCU, and
WRITE to write data to the SCU. CPU unit and SCU will handle the
task with shared memory, so there is no need for writing
complicated programs.
3. SCU unit is equipped with RS-485 network feature, added to the
existing N-series SDU module features, expanding its scope of
usage.
4. RS232C or RS485 communication network is available.
Data input/output with RS232 devices:
Connect to and exchange data with devices like IDX display,
measurement instrument, barcode reader, and printer. Data input/
output with RS485 devices:
Connect through network to temperature controller, network
inverter, and network servo.
5. Unlimited mounting in PLC slots, 500 byte transmission capability.
NX70 PCL SCU Unit
(NX70-SCU)
NX700 PCL SCU Unit
(NX-SCU)
Read data with the advanced instruction, READ
Write data with the advanced instruction,

10
6. Both ASCII and HEX (binary) can be used as transmission code.
7. End code can be configured freely with PLC ladder instructions.
System Configuration
Using RS232C Communication
Using RS485C Communication
You can connect RS232C device/RS485 network device to each
RS232C/RS485 (CH1, CH2) channel.
NX series SCU can be mounted anywhere you want regardless of
whether the backplane is base or expansion. The number of SCU
mounting is not limited.
In addition to this Manual, please refer to System Manual and Programming
Manual for the PLC when using SCU.
NOTE
Barcode Reader
ID Card
Printer
Measurement
instrument
RS-232C Cable
RS-485 communication
Inverter
network
RS-485 communication
Temperature
controller network

11
Specifications
General Specifications
Performance Specifications
Item Specifications
Tem p eratu re Operating 0 °C to +55 °C (32 °F to 131 °F)
Storage -25 °C to +70 °C (-13 °F to 158 °F)
Humidity Operating 30 to 85% RH (Non-condensing)
Storage 30 to 85% RH (Non-condensing)
Withstand voltage 500 V ac for 1 minute between I/O terminal (dc) and frame ground (power unit)
Insulation resistance 100 MΩor more at 500 mega V dc between I/O terminal (dc) and frame ground
(power unit)
Vibration immunity 10 to 55Hz, 1 cycle/minute: double amplitude of 0.75 mm, 10 minutes on 3 axis
(X,Y, Z)
Shock immunity Peak acceleration and duration 15g/11 ms, 3 times in each X, Y, Z direction
Noise immunity 1500 Vp-p with 50ns to 1µs pulse width (generated by noise simulator)
Ambience No corrosive gas, no excessive dust
Occupied I/O points 32 points (16 points input, 16 points output)
Max. number of unit Unlimited
Item Specifications
Interface RS232C/RS485 2 ports
Transmission speed
Configured with DSW1 and DSW2
1) Using RS232C: 300/600/1200/4800/9600/19200/38400bps
2) Using RS485: 4800/9600/19200/38400bps
Communication method Half duplex
Synchronization method Start-stop method
Transmission distance Using RS232C: 15m (MAX), Using RS485: 1.2 Km
Transmission code ASCII or HEX (Binary)
Transmission data
format
STOP bit 1bit/2bit
Parity (even/odd)
Data length 7bit/8bit
Data transmission order From bit 0, by each character
Transmission unit A message, to the end code (length adjustable)
Max. message length MAX. 500 Byte/frame (including end and start codes)
Interface with
CPU unit
Shared memory type:
N-series: Read and write data with advanced instructions F150 (READ) and F151
(WRITE).
Read and write data with advanced instructions READ and WRITE.
I/O allocation 16 points input and 16 points output allocated.
End code setting Select from three types of ccr dcr+LF eETX or set arbitrary code from shared
memory.
Start code Start code
Other special controls
End code cut transmission mode (control by sequence instruction),
Convenient for printing out.
Soft reset (control by sequence instruction)
SCU module is configured as 32 points I/O module with 16 points input and 16 points output.
(For N-series, I/O is allocated by WinFPST S/W and registered as 16SX and 16SY.)
NOTE

12
Unit Diagram
Front View
Inside View
NX700 SCU (NX-SCU)
Operation status display
Reset switch
Forced reset on
the SCU.
RS-232C/485
Interface (CH1)
RS-232C/485
Interface (CH1)
NX700 SCU (NX-SCU) NX70 SCU (NX70-SCU)
Dip Switch (for CH1, CH2)
DSW1 DSW2 DSW3
ON ON ON
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Dip switch is located on the bottom of NX70 SCU (NX70-SCU).
NOTE

13
Operation Status Display and Functions
SCU operation and communication status is displayed on the LED on
the top of the front panel.
SCU front display window
Implications
LED items Function
Power (PWR)
●(On): Unit in operation
○(Off): Power turned off
Operation error (ALARM)
●(On): Operation error
Turned on when watchdog timer identifies an
error. (Press the Reset switch to turn off.)
○(Off): Normal operation
CH.1
Sending data monitor
(SD 1)
◎(Flickering): Sending data
○(Off): No sending data.
Receiving data
monitor (RD 1)
◎(Flickering): Receiving data
○(Off): No receiving data.
Communication error
(ERR 1)
●(On): Communication error
○(Off): Normal communication
CH.2
Sending data monitor
(SD 2)
◎(Flickering): Sending data
○(Off): No sending data.
Receiving data
monitor (RD 2)
◎(Flickering): Receiving data
○(Off): No receiving data.
Communication error
(ERR 2)
●(On): Communication error
○(Off): Normal communication
NX-SCU
PWR
SD1
RD1
ERR1
ALARM
SD2
RD2
ERR2
SCU
NX70-SCU
SCU
NX700 SCU
(NX-SCU)
NX70 SCU
(NX70-SCU)
PWR
SD1
RD1
ERR1
ALARM
SD2
RD2
ERR2
• Communication error LED (ERROR LED) turns on when parity or framing error
occurs.
Receiving: Parity, framing ERROR
Sending: No end code
• Communication error LED turns off when normal frame is received or sent
(writing to shared memory).
NOTE

14
DIP Switch Settings
CH1 Setting
Baud-
Rate
Data
length
Parity
Check
Stop
bit End
code
X-
para
-meter
Baud-
Rate
Data
length
Control
code
Parity
Check
Parity
setting
Stop
bit
Start
code
X-
para
-meter
CH1 setting
Parity
setting
Start
code
End
code
DSW1 DSW2 DSW3
NO NO
NO
DIP Switch is located inside the SCU.
Control
code
Bit location1)
Function
123456781234
DSW1
0 0 0 38400 Bps
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
0
1
1
1
1
Transmission speed
(BAUD RATE) (see below)
19200 Bps
9600 Bps
4800 Bps
2400 Bps
1200 Bps
600 Bps
300 Bps
0
1Data length 7 BIT 8 BIT
0
1Parity check (see below) Invalid Valid
0
1Parity setting Odd parity (ODD) Even parity (EVEN)
0
1STOP bit length 1 STOP Bit 2 STOP Bit
0
1
Control signal (see below)
(CTS, CD)
Not used
Used
DSW2
0
1
0
1
0
0
1
1
End code (see below)
Set to shared memory (1 byte)
CR (0DH) code
CR (0DH), LF (0AH) code
ETX (03H) code
0
1Start code (see below) STX (02H) not used STX (02H) used
0
1X-Parameter Not support
1) “0”stands for OFF. “1” stands for ON.
• When using RS485, the available baud rates are
38,400/19,200/9,600/4,800bps.
• When parity check is set to Invalid, the parity settings
are not applied.
• For control signal, the CTS and CD settings can be
selected, but set it to Not Applicable when using
[3-wire method without flow control]. (using RS232C
communication)
• Start and end codes determine the start and end of a
communication frame.
AT T EN T I ON

15
CH2 Setting
Baud-
Rate
Data
length
Parity
Check
Stop
bit End
code
X-
para
-meter
Baud-
Rate
Data
length
Control
code
Parity
Check
Parity
setting
Stop
bit
Start
code
X-
para
-meter
CH2 Setting
Parity
setting
Start
code
End
code
DSW1 DSW2 DSW3
NO NO
NO
Control
code
Bit location1)
Function
123456781234
DSW2
0 0 0 38400 Bps
1
0
1
0
1
0
1
0
1
1
0
0
1
1
0
0
0
1
1
1
1
Transmission speed
(BAUD RATE) (see below)
19200 Bps
9600 Bps
4800 Bps
2400 Bps
1200 Bps
600 Bps
300 Bps
0
1Data length 7 BIT 8 BIT
0
1Parity check (see below) Invalid Valid
0
1Parity setting Odd parity (ODD) Even parity (EVEN)
0
1Stop bit length 1 Stop Bit 2 Stop Bits
0
1
Control signal (see below)
(CTS, CD)
Not used
Used
DSW3
0
1
0
1
0
0
1
1
End code (see below)
Set to shared memory (1 byte)
CR(0DH) code
CR(0DH), LF(0AH) code
ETX (03H) code
0
1Start code (see below) STX (02h) not used STX (02h) used
0
1X-Parameter Not support
1) “0”stands for OFF. “1” stands for ON.
• When using RS485, the available baud rates are
38,400/19,200/9,600/4,800bps.
• When parity check is set to Invalid, the parity settings
are not applied.
• For control signal, the CTS and CD settings can be
selected, but set it to Not Applicable when using
[3-wire method without flow control]. (using RS232C
communication)
• Start and end codes determine the start and end of a
communication frame.
AT T EN T I ON

16
EXAMPLE (DSW Settings)
Transmission speed: 9600 bps
Data length: 8 bit
Parity Check: Valid
Parity Bit: Odd
Stop Bit: 1 Bit
Control signal: Not applicable
End code: CR
Start code: Not used
X-Parameter: Disabled
CH1 setting
Transmission speed: 9600 bps
Data length: 8 bit
Parity Check : Valid
Parity Bit: Odd
Stop Bit: 1 Bit
Control signal: Not used
End code: CR
Start code: Not used
X-Parameter: Disabled
CH2 setting
Baud-
Rate
Data
length
Parity
Check
Stop
bit End
code
X-
para
-meter
Baud-
Rate
Data
length
Control
code
Parity
Check
Parity
setting
Stop
bit
Start
code
X-
para
-meter
CH2 Setting
Parity
setting
Start
code
End
code
DSW1 DSW2 DSW3
NO
NO
NO
CH1 Setting
Control
code

17
2
Wiring
Wiring
RS232C/RS485 INTERFACE
SCU Connection Signal
●External device referred above means a variety of RS232
and RS485 devices.
●Typical wiring methods are as follows:
1. RS232 Wiring: 3-wire method without flow control
(common wiring method)
2. RS485 Wiring: End termination resistance is built-in.
PIN NO Signal Name Mnemonic Direction
SCU External device
1 FRAME GROUND FG
2SENDDATA SD
3 RECEIVE DATA RD
4
5 SIGNAL GROUND GND
6 485 TRANSIVER- 485-
7 485 TRANSIVER+ 485+
8
9POWER +5V
12345
6789
Connector (9P)

18
RS232 Wiring Diagram
3-wire method without flow control (RS232 device - 9 pin)
3-wire method without flow control (RS232 device-25 pin)
RS485 Wiring Diagram
SCU (9P)
PIN NO Mnemonic
1
2SD
3RD
4
5SG
6 RS485-
7 RS485+
8
9
RS-232 device (9P)
PIN NO Mnemonic
1FG
2RD
3SD
4DTR
5SG
6DSR
7RTS
8CTS
9RI
Turn off the DSW1 No. 8 or DSW3 No.4 which are the
control codes.
AT T EN T I ON
SCU (9P)
PIN NO Mnemonic
1
2SD
3RD
4
5SG
6 RS485-
7 RS485+
8
9
RS-232 device (25P)
PIN NO Mnemonic
1FG
2SD
3RD
4RTS
5CTS
6DSR
7SG
8CD
20 DTR
SCU (9P)
PIN NO Mnemonic
1
2
3
4
5
6 485+
7 485-
8
9
RS-485 device
Mnemonic
485+
485-

19
3
Operations and Programming Examples
Basic Operations
●You need ladder program to operate the SCU.
●Data exchanges between this unit and CPU unit is transmitted via
shared memory.
●Data input from external devices is stored in shared memory only
when there is an end code in the data.
●Data is automatically output when written to shared memory.
The following diagram shows the data flow in each case of barcode
reader connected or printer connected.
Connector (9P)
Barcode Reader
Printer
RS232C (RS485)
Drive Receiver
Data
Shared
memory and I/O
CPU
Data
Memory
RS232C (RS485)
Drive Receiver
C
H
1
C
H
2
Connector (9P)
9788940200278
h
d
e
*1 Shared memory of
SCU enables READ/
WRITE at both the
CPU (processor) of
the SCU and the
CPU(processor) of
the CPU unit.
Data
Memory
CPU
f
g
CPU Unit
SCU Unit
c
Backplane connector (50p)

20
Precautions for SCU Operation
For ASCll communication of Rs232C/RS485
●Errors of transmission processing are reflected at contacts
(NX series: X4 to XD, NX plus series: R0.4 to R0.13) so resending
with ladder program is recommended. (See below)
If an error occurs while the frame is receiving, the frame will be
cleared and error LED turns on. But if the next frame is a normal
frame, the error LED turns off and the frame is processed as the
received frame.
●When the start code is effective, the frame will start at the last
receiving start code and end at the end code.
1. When the end code is not received due to communication
trouble, the SCU stands by until the end code is received.
2. You can prevent a prolonged stand-by as follows:
Request resending to the external RS232C (RS485) device.
If resending is not available at the other RS232C (RS485) device,
perform time-up process with ladder program and request
resending to the external device.
Barcode
Reader
Shared
memory CPU
Memory
Input to the SCU
from external
devices
Memory
CPU
SCU (unit processing) CPU unit (ladder program)
Output from
inside the SCU Shared
memory CPU
Memory MemoryCPU
Printer
cdefg
hde fg
SCU (unit processing) CPU unit (ladder program)
Products like ID-X, where I/O (sending/receiving)
passes through only one channel, can be operated as
half duplex.
The SCU performs communications regardless of
PROG/RUN mode, but data transmission is available
only in RUN mode.
AT T EN T I ON
[Ex] STX: Start code
ETX: End code
Start code is effective: 1 frame
Start code is not effective
STX STX ETX