User`s manual

1
OVERVIEW
1.1 Features
1 - 3
1
Overview
2
Performance Specification
3
Sequence Program Configuration and Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files Handled by CPU Module
6
Functions
7
Communication with Intelligent Function Module
8
Parameters
1.1 Features
The QS series CPU module has the following new features:
(1) Safety PLC system can be constructed
The QS series PLCs have obtained the highest safety level (IEC61508 SIL3, EN954-
1/ISO13849-1 Category 4) applicable to PLCs.
(2) The safety CPU operation mode is equipped for safe system operation
The CPU module is equipped with two safety CPU operation modes. "SAFETY
MODE" for safe system operation and "TEST MODE" for system construction and
maintenance.
These two modes prevent the user's erroneous operations for safe system operation.
(a) SAFETY MODE
SAFETY MODE is a mode for safe system operation. This mode prohibits the
write operation from a programming tool and the device test operation during the
system operation.
(b) TEST MODE
TEST MODE is a mode for maintenance. This mode enables the write operation
from a programming tool and the device test operation to debug or maintain the
sequence program.
Figure 1.1 Safety PLC system
Power supply/CPU/CC-Link Safety master module
CC-Link Safety remote I/O station
GX Developer
(Version 8.40S or later)
CC-Link Safety
Emergency stop switch
Light curtain