Omron SYSMAC PLC Basic Technical Manual page 4

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.
Programming
/Monitor PC
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
Application Section
HMI Section
Operation/Display
Section
Loop Control Section
Control
Section
Sequence Control
Section
Signal I/O Section
Signal Conversion (Signal Conditioner)
Field Device
PLC
4 to 20 mA 4 to 20 mA 4 to 20 mA
Sensor Flow rate Sensor
Operation/Display Screen Creation
Control Block/Sequence Creation
Batch management, brand management, remote
surveillance (Web)
Data gathering, data analysis
Meter screen, graphics screen, trends,
Warning history, operational history, operational guide
Function Block (FBD), Sequence Table, Step ladder
Ladder, FB (Ladder/ST Language)
Analog I/O, Digital I/O, Pulse Input
Temperature, Current/Voltage, Isolator, Pulse,
Distributor
Sensor, Actuator
Compensating
4 to 20 mA Leadwire
Thermo
Couple
Capacitive
Flow Rate
Process
Sensor
CX-Process Tool
CX-Programmer
Third Party Products etc
CX-Process Monitor Plus
NS Series etc.
Loop Controller
Loop Control Board/Unit
(
or Process CPU/Loop CPU
Loop Control Section
CS/CJ Series CPU
Process/Analog I/O Unit
Digital I/O Unit etc.
CSM_PLC Process_TG_E_1_1
PT or HMI
Software
4 to 20 mA
)
1