Safety Precautions - Mitsubishi MELESEC-ST User Manual

Table of Contents

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.

The precautions given in this manual are concerned with this product. Refer to the user's manual of the

network system to use for a description of the network system safety precautions.

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

"CAUTION".

DANGER

CAUTION

Depending on circumstances, procedures indicated by

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]

Create an interlock circuit on the program so that the system will operate safety based on the

communication status information. Failure to so may cause an accident due to an erroneous

output or malfunction.

When an error occurs, all outputs are turned OFF in the MELSEC-ST system (at default).

However, I/O operations of the head module and respective slice modules can be selected for

the errors described below.

Select the status for each module for the entire system safety.

(1) Communication error (Head Module User's Manual)

(2) Slice module error

The output status for the case of an error can be set to Clear, Hold or Preset with a

command parameter of each slice module. (For setting availability, refer to the manual for

each slice module.)

Since the parameter is defaulted to Clear, outputs will be turned off if an error occurs.

This parameter setting can be changed to Hold or Preset when the system safety is more

ensured by holding or presetting the output.

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