Precautions For System Configuration; Precautions For Using Redundant Cpu - Mitsubishi Electric Melsec Q Series User Manual

2
SYSTEM CONFIGURATION

2.6 Precautions for System Configuration

This section describes precautions for system configuration.

2.6.1 Precautions for using Redundant CPU

The following describes the precautions for using the Redundant CPU.
(1) Mountable base unit
When using the MES interface module in a redundant system, be sure to mount the
MES interface module to the extension base unit for CPU or redundant power supply.
The MES interface module cannot be mounted to the main base unit in a redundant
system.
(2) [Access target CPU setting]
(3) [Device Tag setting]
(4) [Job setting]
When accessing the Redundant CPU, it is recommended to select [Handshake
operation] for the trigger condition of a job.
When other than [Handshake operation] is selected for the trigger condition, the
following phenomenon may occur at system switching of a redundant system.
• When the MES interface module is mounted to the Redundant CPU, it can
access the CPU of host station only.
It cannot access the CPU of other station.
• When the MES interface module is mounted to other than the Redundant CPU, it
cannot access the Redundant CPU of other station.
• When a system switching occurs to the Redundant CPU, collection of device tag
may stop for about 15 seconds.
• When selecting [High-speed sampling] from Sampling settings of Device Tag
setting, be sure to create system area for the user setting to the Redundant CPU
of both systems in the same capacity.
Section 7.8.1
REMARKS
• Data separation
• The write data is not reflected to the programmable controller CPU.
Section 7.10.2 (8) Handshake operation
(1) Creating a user-specified system area
2.6 Precautions for System Configuration
2.6.1 Precautions for using Redundant CPU
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