In addition to duplexed CPU units and power supply units, the customer can duplex other components, such as communications units (Controller link or Ethernet) and expansion cables, to match the system requirements and provide a diverse range of duplex system configurations.

Ethernet can be duplexed as well as controller link, which both have a proven track record in FA applications.
In addition, a variety of networks are available for lower-level I/O, including DeviceNet, CompoNet, and the MECHATROLINK-II motion controller network. Both DeviceNet and CompoNet are open networks that boast a proven track record with the CS1 Series.

Of course, the standard CS-series PLC resources can be used as-is, and a CS1D duplex system can be set up and used easily, even by users setting up a duplex system for the first time.

• If an error occurs in the active CPU unit, a switching program is not needed in the standby CPU unit!
• CPU unit operation switches smoothly. Switching time is short, so operation can continue without bumps.

Since the active and standby CPU units always operate synchronously, control continues automatically and continuously in the standby CPU unit if an error occurs in the active CPU unit.

The standby CPU unit is normally stopped. If an error occurs in the active CPU unit, the standby CPU unit becomes the active CPU unit. The transfer between CPU units is limited and control is discontinuous due to initialization during the switch-over.

• When an error occurs, it is not necessary to use a complex switching program or special data link area for Duplexing!

Note : The figure shows Duplexing controller link units. For details on wiring optical fiber cables, refer to the CS1W-CLK12-V1/CLK13/CLK52-V1/CLK53, CVM1-CLK12/CLK52 optical ring controller link units Operation Manual (Cat. No. W370)

The newly released duplex CPU, dual I/O expansion system draws attention in the maintenance field! This system answers the needs of users who want to make improvements and add functions without stopping the equipment. This strengthens the proven CS1D duplex system even more.
The functions in this section are supported only in a duplex CPU, dual I/O expansion system .

• A computer is not needed for onsite operations!
• units can be replaced without knowing programming device procedures!

• Functions can be added easily after the system has started operating, even if the system cannot be turned OFF or stopped.
• Adjustments and improvements can be easily made when setting up new systems without turning OFF the power.

While online, a unit can be added easily to an empty slot. (This function is supported in duplex CPU singleI/O expansion system s and duplex CPU dual I/O expansion systems.)

In addition, an expansion backplane as well as its mounted units can be added easily.

By Duplexing the expansion units and expansion cables, the expansion cables are duplexed and can be replaced during operation. In addition, cable disconnections are monitored so failures can be located easily.

A variety of system configurations can be created, such as a duplex CPU system using a CS1D process-control CPU unit with a built-in loop control board (LCB) function or a singleCPU system using a loop control board mounted in the CS1D CPU unit's Inner Board slot. You can retain the openness and cost performance of a general-purpose PLC base while expanding the possible range of PLC control with process control functions and reliability that are equivalent to some of the functions and performance of DCS.

Initial costs are high because a large-scale system must be used.

[Down-sizing]
Using the PLC base saves cost, space, and time.