422
27 PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
27.1 Overview
27 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.
27.1 Overview
The following table lists two procedures for starting up a redundant system.
Starting up both systems at a time
1. Installing batteries
Install a battery to the CPU module of each system. ( MELSEC iQ-R CPU Module User's Manual (Startup))
2. Mounting extended SRAM cassettes and inserting SD memory cards
Mount an extended SRAM cassette and insert an SD memory card to the CPU module of each system as needed. (
MELSEC iQ-R CPU Module User's Manual (Startup))
Do not power off or reset the CPU module, or remove an SD memory card during an access to the SD memory card. (
Page 411 Using an SD memory card)
3. Mounting modules and wiring each device
Mount modules on the base unit of each system and wire each device. Use modules of the same model, and mount them on
the same slots on each base unit. ( MELSEC iQ-R Module Configuration Manual, Page 428 Wiring)
4. Powering on the systems
Check each system for the following and power on the systems.
• Wiring to the power supply module is correct.
• The power supply voltage is within the range of 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: 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 and a CPU module
Start an engineering tool installed on a personal computer. ( Page 430 Creating a Project)
Connect the personal computer on which the engineering tool has been installed and a CPU module. ( Page 430
Connecting a Personal Computer and a CPU Module)
6. Initializing the CPU module
Initialize the CPU module with the engineering tool. ( MELSEC iQ-R CPU Module User's Manual (Startup))
After initialing the CPU module, connect the other CPU module and the personal computer. ( Page 430 Connecting a
Personal Computer and a CPU Module)
Initialize the CPU module in the same way.
Start-up procedure Description
Starting up both systems at a time Prepare both systems and follow this procedure to start up both systems as a redundant system
when the systems are powered on.
Starting up the systems one by one Follow this procedure to start up a control system first to perform controls, and then start up a
standby system to build a redundant system.
• Debugging before operation can be performed with only one system.
• If one system has failed and the system is powered off before module replacement, powering on
this system again starts up only this system.
To Next Page
Loading...
