Product Features

DCS style features in a cost-efficient automation control system

The specialized CPU inherits its high performance from the MELSEC iQ-R Series when used together with the centralized programming suite GX Works3 and iQ Works. The process control system incorporates a dedicated process instruction set (such as two-degree-of-freedom PID, sample PI, and auto-tuning), realizing algorithmic PID and highly reliable features such as being able to interchange (hot-swap) I/O modules while the system is still online and large-scale process control with a maximum of 300 loops, closely bringing it in line with DCS capabilities without the financial burden.

Redundant system remote location and high-speed switching

Optical-fiber tracking cables enable the standby system to be installed in a remote location up to 550 m from the control (primary) system. The tracking cables are immune to noise interference and support fast data transfer rates. System switching speed from the control system to standby system has also been improved to speeds of 10 ms or less, further improving system reliability.

Improve reliability with reduced single-point failure

A multi-level redundant system can be realized by installing dual control systems consisting of the control (primary) and standby CPUs. Combined with a dual extension cable topology for both the redundant extension base units and network cabling of the CC-Link IE Field networks together with dual remote stations, minimizes the risk of singe-point failure. Online replacement of cables and modules (hot-swapping) is possible without stopping the operating control system when an error occurs.

Efficient engineering through extensive compatibility between software

An efficient and highly-scalable engineering environment can be realized by the extensive compatibility between GX Works3 together with SCADA software GENESIS64™, monitoring software GT SoftGOT and GT Works3 [GOT (HMI)].

■ Highly scalable process control visualization
Process tag labels (variables) can be shared between GX Works3, SCADA software GENESIS64™, GT SoftGOT2000, and GOT2000, realizing an efficient engineering environment that makes screen creation easier. In addition, a scalable SCADA control system can be realized combining these products.

■ Integrated engineering software realizing easy programming and maintenance
GX Works3 is a centralized programming environment supporting various programming, debug and maintenance features, thereby enabling efficient engineering. Multiple programming languages can be used within the same GX Works3 project, including function block diagram (process control programming), ladder, structured text and sequential function chart.

Process CPU module specifications

 : Ladder diagram  : Structured text  : Function block diagram  : Sequential function chart

Item	R08PCPU	R16PCPU	R32PCPU	R120PCPU
Control method	Stored program cyclic operation
I/O control mode	Refresh mode (Direct access I/O is available by specifying direct access I/O (DX, DY) )
Programming language	LD ST FBD SFC
Extended programming language	Function block (FB), label programming (system/local/global)
Program execution type	Initial, scan, fixed scan, interrupt, standby
Number of I/O points [X/Y] (point)	4096	4096	4096	4096
Constant scan (ms) (Function for keeping regular scan time)	0.2...2000 (Setting available in 0.1 ms increments)
Memory capacity
Program capacity (step)	80K	160K	320K	1200K
Program memory (byte)	320K	640K	1280K	4800K
Device/label memory (ECC type)*1 (byte)	1188K	1720K	2316K	3380K
Data memory (byte)	5M	10M	20M	40M
Instruction processing time
LD instruction (ns)	0.98	0.98	0.98	0.98
MOV instruction (ns)	1.96	1.96	1.96	1.96
E + instruction (floating-point addition) (ns)	9.8	9.8	9.8	9.8
Structured text IF instruction*2 (ns)	1.96	1.96	1.96	1.96
Structured text FOR instruction*2 (ns)	1.96	1.96	1.96	1.96
PC MIX value*3 (instructions/μs)	419	419	419	419
Interface connection port
High-speed USB2.0 (miniB	●	●	●	●
Ethernet (100BASE-TX/10BASE-T)	●	●	●	●
Memory interface*4
SD memory card	●	●	●	●
Extended SRAM cassette	●	●	●	●
Function*5
Multiple interrupt	●	●	●	●
Standard PID control	●	●	●	●
Process control	●	●	●	●
Data logging	●	●	●	●
Security function	●	●	●	●
Inter-module synchronization*6	●	●	●	●
SLMP communication	●	●	●	●
Online module change	●	●	●	●
Firmware update*7	●	●	●	●

*1. Extended SRAM cassette expands the device/label memory area. (NZ2MC-8MBSE expands the device/label memory area conforming to ECC type memory.)
*2. The IF or FOR sentence of the structured text consists of several instructions, which may increase the processing time period.
*3. Average number of instructions such as for basic instructions and data processing executed in 1 µs. The larger the value, the faster the processing speed.
*4. For more information please refer to the SD memory card and SRAM cassette specifications on “SD memory card specifications”.
*5. Memory dump and real-time monitor are not supported.
*6. Inter-module synchronization is not supported when used in redundant mode.
*7.Depends on supported CPU firmware version, for more information please refer to the relevant product manual.

Redundant function module specifications