[Design Precautions]
WARNING
Configure safety circuits external to the programmable controller to ensure that the entire system
operates safely even when a fault occurs in the external power supply or the programmable
controller. Failure to do so may result in an accident due to an incorrect output or malfunction.
(1) Configure external safety circuits, such as an emergency stop circuit, protection circuit, and
protective interlock circuit for forward/reverse operation or upper/lower limit positioning.
(2) The programmable controller stops its operation upon detection of the following status, and the
output status of the system will be as shown below.
All outputs may turn on when an error occurs in the part, such as I/O control part, where the CPU
module cannot detect any error. To ensure safety operation in such a case, provide a safety
mechanism or a fail-safe circuit external to the programmable controller. For a fail-safe circuit
example, refer to Chapter 10 LOADING AND INSTALLATION in the QCPU User's Manual
(Hardware Design, Maintenance and Inspection).
(3) Outputs may remain on or off due to a failure of an output module relay or transistor. Configure
an external circuit for monitoring output signals that could cause a serious accident.
Output
All outputs are turned off.
All outputs are held or turned off according to
the parameter setting.
Overcurrent or overvoltage protection of the power supply module
is activated.
The CPU module detects an error such as a watchdog timer error
by the self-diagnostic function.
Status
速型电压/电流输入模拟量模块 Q64ADH
主基板 Q312B
MELSECNET/H模块 QJ71LP21-25
Q系列PLC线性快闪存储卡 Q2MEM-2MBF
晶体管输出模块(弹簧夹接线端子) QY80-TS
铂电阻型温度调节模块(升级版) Q64TCRTN
温度输入模块 Q64RD，Q64RD-G
串行通信模块 AJ71QC24N-R4
TTL CMOS输出模块 QY70
差动输出定位模块 QD75D4
继电器输出模块 QY10
通道间隔离脉冲输入 QD60P8-G
定位模块(升级版) QD75P4N
过程CPU Q12PHCPU，Q25PHCPU
带以太网类型的Q系列CPU Q03UDECPU
GI-62.5/125光缆型模块 QJ72LP25GE
薄型电源模块 Q61SP
电压/电流输出模拟量模块 Q64DAN
电源模块 Q61P
晶体管输出模块(源型) QY80
QCPU（Q模式）用总线连接电缆 GT15-QC30B
Ethernet模块 AJ71QE71N-T
性能型QCPU Q25HCPU
A模式Q系列CPU Q06HCPU-A
更换用大容量电池模块 Q8BAT
带以太网类型的Q系列CPU Q04UDEHCPU
性能型CPU Q02CPU，Q06HCPU，Q25HCPU
处理速度更快的CPU Q04UDHCPU
TTL CMOS输出模块 QY71
GT11触摸屏 GT1150-QLBD