Справочник Пользователя для Mitsubishi Electronics Q25HCPU

 

 

 

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 SAFETY PRECAUTIONS   

(Read these precautions before using.) 

 

When using Mitsubishi equipment, thoroughly read this manual and the associated manuals introduced in 

this manual. Also pay careful attention to safety and handle the module properly. 

These SAFETY PRECAUTIONS classify the safety precautions into two categories: "DANGER" and 

"CAUTION". 

!

DANGER

CAUTION

!

Indicates that incorrect handling may cause hazardous conditions,
resulting in death or severe injury.

Indicates that incorrect handling may cause hazardous conditions, 
resulting in medium or slight personal injury or physical damage.

 

Depending on circumstances, procedures indicated by 

!

 CAUTION may also be linked to serious 

results. 

In any case, it is important to follow the directions for usage. 

 

Store this manual in a safe place so that you can take it out and read it whenever necessary. Always 

forward it to the end user. 

 

[DESIGN PRECAUTIONS] 

!

 DANGER 

 Install a safety circuit external to the PLC that keeps the entire system safe even when there 

are problems with the external power supply or the PLC module. Otherwise, trouble could result 

from erroneous output or erroneous operation. 

(1) Outside the PLC, construct mechanical damage preventing interlock circuits such as 

emergency stop, protective circuits, positioning upper and lower limits switches and 

interlocking forward/reverse operations. 

(2) When the PLC detects the following problems, it will stop calculation and turn off all output 

in the case of (a). In the case of (b), it will stop calculation and hold or turn off all output 

according to the parameter setting. 

Note that the AnS series module will turn off the output in either of cases (a) and (b). 

 

(a) The power supply module has over current protection equipment and over voltage 

protection equipment. 

(b) The PLC CPUs self-diagnosis functions, such as the watch dog timer error, detect 

problems. 

In addition, all output will be turned on when there are problems that the PLC CPU cannot 

detect, such as in the I/O controller. Build a fail safe circuit exterior to the PLC that will make 

sure the equipment operates safely at such times. See section 9.1 of this manual for 

example fail safe circuits. 

(3) Output could be left on or off when there is trouble in the outputs module relay or transistor. 

So build an external monitoring circuit that will monitor any single outputs that could cause 

serious trouble.