Chapter 5 Procedure For Starting Up A Redundant System; Overview; Starting Up Both Systems Simultaneously - Mitsubishi Electric MELSEC iQ-R Series User Manual

5
PROCEDURE FOR STARTING UP A
REDUNDANT SYSTEM
This chapter describes the procedures for starting up a redundant system starting from the start-up procedure of CPU
modules to execution of programs.
5.1

Overview

There are two ways to start up a redundant system.
Start-up procedure
Starting up both systems
simultaneously
Starting up the systems one by one

Starting up both systems simultaneously

1.
Installing a battery
Install a battery to the CPU module of each system. ( Page 38 Installing a Battery)
2.
Inserting an extended SRAM cassette or an SD memory card
Insert an extended SRAM cassette or an SD memory card into the CPU module of each system as needed. ( Page 39
Inserting or Removing an Extended SRAM Cassette, Page 40 Inserting and Removing an SD Memory Card)
Do not power off or reset the CPU module, or remove an SD memory card during an access to the SD memory card. (
Page 162 When an SD memory card is used)
3.
Mounting modules and connecting cables
Mount modules on the base unit of each system, and connect cables. Use modules of the same model, and mount them on
the same slots on each base unit. ( MELSEC iQ-R Module Configuration Manual,  Page 62 Wiring)
4.
Powering on the redundant system
Check the following on each system, and supply power to the main base unit and extension base units of both systems.
• A cable is correctly connected to the power supply.
• The power supply voltage is within the range of the specifications.
• The CPU module is in the STOP state.
Check that the following LEDs turn on after the system is powered on.
• Power supply module on the main base unit and extension base units: POWER LED
• CPU module: READY LED
• Redundant function module: RUN LED
In step 4, the ERROR LED of each CPU module flashes and the ERR LED of each redundant function module turns on.
Proceed to the next step.
5.
Connecting a personal computer to the CPU module
Start up the engineering tool installed on a personal computer. ( Page 64 Creating a Project)
Connect the personal computer to the CPU module of one system. ( Page 64 Connecting a Personal Computer and the
CPU Module)
6.
Initializing the CPU module
Initialize the CPU module using the engineering tool. ( Page 43 Initializing the CPU Module)
After initialing the CPU module of one system, connect the engineering tool to the CPU module of the other system. (
Page 64 Connecting a Personal Computer and the CPU Module)
Initialize the CPU module in the same way.
5 PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
54
5.1 Overview
Description
Configure two systems, and follow this procedure to start up both systems as a redundant system when the systems
are powered on.
In a redundant system without extension base units, follow this procedure to start up a control system first to perform
control, and then start up a standby system to configure a redundant system.
• Debugging before operation can be performed with only one system.
• One system has failed and the redundant system is powered off before the failed module is replaced. In this case,
only one system can be started up when the redundant system is powered on next time.
In a redundant system with redundant extension base unit, the system that is started up first will be the control system.