Safety Precautions - Mitsubishi Electric MELSEC iQ-F Series FX5 User Manual

SAFETY PRECAUTIONS

(Read these precautions before use.)
Before using this product, please read this manual and the relevant manuals introduced in this manual carefully and pay full
attention to safety in order to handle the product correctly.
This manual classifies the safety precautions into two categories: [
WARNING
CAUTION
Depending on the circumstances, procedures indicated by [
It is important to follow all precautions for personal safety.
Store this manual in a safe place so that it can be read whenever necessary. Always forward it to the end user.
[DESIGN PRECAUTIONS]
WARNING
● Make sure to set up the following safety circuits outside the PLC to ensure safe system operation
even during external power supply problems or PLC failure. Otherwise, malfunctions may cause
serious accidents.
(1) Note that when the PLC CPU detects an error, such as a watchdog timer error, during self-
diagnosis, all outputs are turned off. Also, when an error that cannot be detected by the PLC CPU
occurs in an input/output control block, output control may be disabled. External circuits and
mechanisms should be designed to ensure safe machine operation in such a case.
● Do not write any data into the "system area" of the buffer memory in the intelligent function module.
Executing data writing to the "system area" may cause malfunction of the programmable controller
alarm.
● When executing control (data change) to a running other station programmable controller by
connecting the external device to the SLMP compatible device, configure interlock circuits in the
program of the other station programmable controller to ensure that the entire system operates safely
at any time.
For other controls to a running other station programmable controller (such as program modification or
operating status change), read relevant manuals carefully and ensure the safety before the operation.
Especially, in the case of a control from an external device to a remote other station programmable
controller, immediate action cannot be taken for a problem on the programmable controller due to a
communication failure.
Determine the handling method as a system when communication failure occurs along with
configuration of interlock circuit on other station PLC program, by considering external equipment and
other station PLC.
● Do not write any data into the "system area" or "write protect area" of the buffer memory in the SLMP
compatible device or intelligent function module. Also, do not output (ON) any "use prohibited" signals
among the signals which are output to the SLMP compatible device and intelligent function device.
Executing data writing to the "system area" or "write protect area", or outputting "use prohibited"
signals may cause malfunction of the programmable controller alarm.
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.
WARNING] and [
CAUTION] may also cause severe injury.
CAUTION].
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