CPU Overview

Programmable Controller

CS1

C--31

CS1D Duplex CPU Specifications

J System Configuration and Basic Functions

Item

Specification

Functional equivalence of

existing CS1-H CPUs

The following CPUs are equivalent in terms of basic functions (I/O points, program capacity, DM

capacity, and instruction execution speed).

CS1D-CPU67H: Equivalent to CS1H-CPU67H.

CS1D-CPU65H: Equivalent to CS1H-CPU65H.

Mountable Modules

CS1-Series Basic I/O Modules, CS1-Series Special I/O Modules, CS1-Series CPU Bus Modules

C200H Basic I/O Modules C200H Group-2 Multipoint I/O Modules, and C200H Special I/O Modules

cannot be mounted.

Mountable Inner Boards

Non-duplex Inner Boards cannot be used in either Duplex Mode or Simplex Mode.

System configuration

These system configurations are possible:

Duplex System

In a Duplex System, two CS1D CPUs, two (or one) CS1D Power Supply Units, and one Duplex Unit are

mounted to a CS1D Backplane.

Simplex System

In a Simplex System, one CS1D CPU, two (or one) CS1D Power Supply Units, and one Duplex Unit are

mounted to a CS1D Backplane.

Duplex Mode

A Duplex System can be operated in either of the following two modes:

Duplex Mode

The system operates with CS1D CPUs and CS1D Power Supply Units in duplex status.

Simplex Mode

The system operates with just a single CS1D CPU. In a Simplex System, only the Simplex Mode is

possible.

Duplex CS1D CPUs

(Supported only in Duplex

Mode in a Duplex System)

Operation of the two

CS1D CPUs in

Duplex

Operation of the two CS1D CPU in Duplex Mode Hot standby method:

One of the two CS1D CPUs actually controls operations, and the other is on

standby as a backup. The two CS1D CPUs have the same I/O memory, and

parameters (PLC Setup, I/O tables, etc.), and both run the same user’s program.

Their operations differ in the following points:

The active CPU executes I/O refreshing and all event servicing.

The standby CPU handles file accessing (read only) and FINS command

execution event servicing (read only).

Operation switching

errors

Power interruptions

(CPU operation setting

switch: NO USE), CPU

errors, memory errors,

program errors, cycle

time overrun errors,

FALS executions

If any of the errors listed on the left occur in the active

CPU, stopping operation, the standby CPU

automatically switches to active status and takes over

control. At the same time, the mode is switched to

Simplex Mode. The CPU where the error occurred

can be replaced without stopping system operation.

Duplex errors

Duplex bus errors

Duplex verification

errors

If either of the errors listed on the left occurs in Duplex

Mode, the active CPU remains the same and

operation is switched to Simplex Mode.

Automatic recovery

to duplex operation

After operation has been switched from Duplex Mode to Simplex Mode as a

result of any of the operation switching errors listed above, operation is

automatically returned to Duplex Mode when it is determined that the cause of

the error has been cleared. Automatic recovery to duplex operation must first be

enabled in the PLC Setup. (The recovery can be repeated up to ten times.)

Hardware conditions

for the two CS1D

CPUs in Duplex

Mode

Identical models must be used for the two CS1D CPUs.

Software conditions

for the two CS1D

CPUs in Duplex

Mode

The same user program areas must be used.The same parameter areas (PLC

Setup, etc.) must be used.

CS1D CPU online

replacement

The CS1D CPU where the error occurred can be replaced online by turning OFF

the power to only that Unit (i.e., setting the CPU operation switch to NO USE).

(This table continues on the next page.)