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CSM_PLC Process_TG_E_1_1
Technical Guide for PLC-based Process Control
What is the OMRON PLC-based Process Control?
OMRON PLC-based Process Control system is based on the SYSMAC CS/CJ PLC Series. By adding PLC-based Process Control units to the
basic system configuration, PLC process control functions can be simply added on to the basic functions already installed in the PLC.
Thus, it can be used for devices that it is compatible with such process control system in which DCS was used before or devices in which several
controllers were used combined.
With the PLC Installation System, analog processing is carried out by the loop control section or the loop control unit/board (hereafter "loop
controller"), and ladder processing is handled by the CPU. Communication between the two sections is made using bits of memory. Since the
analog processing and ladder processing can be completely separated and the program is more simple than a ladder only program, the
engineering process to construct the system is facilitated.
System configuration of PLC-based process control
The loop controller does not have an external analog I/O or an external contact I/O function.
It is used together with such a unit that has the interface function including an analogue I/O unit, as shown in the diagram below.
Also, when programming, in addition to the programming software for the CPU Unit (CX-Programmer, additional programming software (CX-
Process) will be required to create Function block data. And in order to monitor and alter settings during operation, a HMI section will also be
required, in combination with the application in use.
Program Creation Section
Operation/Display Screen Creation
Control Block/Sequence Creation
CX-Process Tool
CX-Programmer
HMI Section
Application Section
Batch management, brand management, remote
surveillance (Web)
Data gathering, data analysis
Third Party Products etc
Operation/Display
Section
Meter screen, graphics screen, trends,
Warning history, operational history, operational guide
CX-Process Monitor Plus
NS Series etc.
Control
Section
Loop Control Section
Function Block (FBD), Sequence Table, Step ladder
Loop Controller
Loop Control Board/Unit
or Process CPU/Loop CPU
(
Loop Control Section
)
Sequence Control
Section
Ladder, FB (Ladder/ST Language)
CS/CJ Series CPU
Signal I/O Section
Analog I/O, Digital I/O, Pulse Input
Process/Analog I/O Unit
Digital I/O Unit etc.
Signal Conversion (Signal Conditioner)
Temperature, Current/Voltage, Isolator, Pulse,
Distributor
Field Device
Sensor, Actuator
Proce
ss
4 to 20 mA
4 to 20 mA
4 to 20 mA
4 to 20 mA
4 to 20 mA
Thermo
Co
u
ple
Compen
sa
ting
Le
a
dwire
S
en
s
or
PT or HMI
S
oftw
a
re
PLC
C
a
p
a
citive
Flow R
a
te
S
en
s
or
Flow r
a
te
S
en
s
or
Progr
a
mming
/Monitor PC