CS1D-CPU
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System Configuration Section 1-2<br />

The Two Modes in a <strong>CS1D</strong> Duplex <strong>CPU</strong> System<br />

A <strong>CS1D</strong> Duplex <strong>CPU</strong> System can be operated in either Duplex Mode or Simplex<br />

Mode.<br />

Duplex Mode<br />

In Duplex Mode, the <strong>CPU</strong> Units are placed in duplex system status. If a<br />

fatal error occurs in the active <strong>CPU</strong> Unit, control is switched to the standby<br />

<strong>CPU</strong> Unit and operation continues.<br />

Simplex Mode<br />

In Simplex Mode, a single <strong>CPU</strong> Unit controls operation.<br />

System Configuration<br />

<strong>CS1D</strong> <strong>CPU</strong> Rack for a Duplex <strong>CPU</strong>, Dual I/O Expansion System<br />

8<br />

4) <strong>CS1D</strong>-BC042D <strong>CPU</strong> Backplane<br />

for Duplex <strong>CPU</strong> Systems<br />

5) <strong>CS1D</strong>-IC102D<br />

I/O Control Units<br />

Duplex Connecting<br />

Cables<br />

1) <strong>CS1D</strong>-DPL02D<br />

Duplex (DPL) Unit<br />

2) <strong>CS1D</strong>-<strong>CPU</strong>65H/67H/65P/67P<br />

<strong>CPU</strong> Units with unit version 1.3 or later,<br />

for Duplex <strong>CPU</strong> Systems (See note 3.)<br />

Up to 3 to 5 Units can Duplex<br />

be mounted. (See note 2.) <strong>CPU</strong> Units<br />

CS-series Basic I/O Units, Special<br />

I/O Units, and <strong>CPU</strong> Bus Units.<br />

Duplex Power<br />

Supply Units<br />

3) <strong>CS1D</strong>-PA207R or<br />

<strong>CS1D</strong>-PD024/025<br />

Power Supply Units<br />

<strong>CS1D</strong> <strong>CPU</strong> Rack<br />

Note 1. C200H-series Units cannot be mounted.<br />

2. The maximum number of Units depends on the number of <strong>CS1D</strong> I/O Control<br />

Units that are mounted.<br />

3. The only <strong>CPU</strong> Units that can be mounted are <strong>CPU</strong> Units for a <strong>CS1D</strong> Duplex<br />

System with a unit version 1.3 or later. If a <strong>CPU</strong> Unit with unit version<br />

1.2 or earlier is mounted, an I/O bus error will occur and the system will not<br />

operate.<br />

Name Model number Contents<br />

1 Duplex Unit<br />

(Especially for a<br />

Duplex <strong>CPU</strong>, Dual I/O<br />

Expansion System)<br />

2 <strong>CPU</strong> Units for Duplex<br />

<strong>CPU</strong> Systems (Unit<br />

version 1.3 or later)<br />

<strong>CS1D</strong>-DPL02D The Duplex Unit is the Unit that controls duplex system operation. It<br />

monitors for errors and switches operation when an error occurs.<br />

This Duplex Unit can be replaced online.<br />

This Duplex Unit cannot be used in a Duplex <strong>CPU</strong>, Single I/O<br />

Expansion System.<br />

<strong>CS1D</strong>-<strong>CPU</strong>65H<br />

<strong>CS1D</strong>-<strong>CPU</strong>67H<br />

<strong>CS1D</strong>-<strong>CPU</strong>65P<br />

<strong>CS1D</strong>-<strong>CPU</strong>67P<br />

<strong>CPU</strong> Units for Duplex <strong>CPU</strong> System are designed especially for a<br />

Duplex <strong>CPU</strong> System. Two <strong>CPU</strong> Units of the identical model are<br />

mounted.<br />

<strong>CPU</strong> Units with unit version 1.3 or later are required.<br />

These <strong>CPU</strong> Units cannot be used in a Single <strong>CPU</strong> System.

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