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Before installation, operation, maintenance or inspection of this product, thoroughly read through and
understand this manual and all of the associated manuals. Also, take care to handle the module properly and
safely.
This manual classifies the safety precautions into two categories:
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 taken out and read whenever necessary. Always forward it
to the end user.
1. DESIGN PRECAUTIONS
•
Make sure to have the following safety circuits outside of the PLC to ensure safe system operation even during
external power supply problems or PLC failure.
Otherwise, malfunctions may cause serious accidents.
1) Most importantly, have the following: an emergency stop circuit, a protection circuit, an interlock circuit for
opposite movements (such as normal vs. reverse rotation), and an interlock circuit (to prevent damage to the
equipment at the upper and lower positioning limits).
2) 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 machinery operation in such a case.
•
For the operating status of each node in the case of a communication error, see the FX
the product manual of each node.
Erroneous output or malfunctions may cause an accident.
•
When executing control (data changes) to an operating PLC, construct an interlock circuit in the sequence program
so that the entire system operates safely. In addition, when executing control such as program changes and
operation status changes (status control) to an operating PLC, carefully read the manual and sufficiently confirm
safety in advance. Especially in control from external equipment to a PLC in a remote place, problems in the PLC
may not be able to be handled promptly due to abnormality in data transfer. Construct an interlock circuit in the
sequence program. At the same time, determine the actions in the system between the external equipment and the
PLC for protection against abnormalities in data transfer.
[Precautions for using products in a UL/cUL Class , Division 2 environment]
*1
with the Cl., DIV.2 mark on the rating plate are suitable for use in Class , Division 2, Groups A, B, C
•
Products
and D hazardous locations, or nonhazardous locations only.
This mark indicates that the product is certified for use in the Class , Division 2 environment where flammable
gases, vapors, or liquids exist under abnormal conditions. When using the products in the Class , Division 2
environment, observe the following to reduce the risk of explosion.
-
This device is open-type and is to be installed in an enclosure suitable for the environment and require a tool or
key to open.
Warning - Explosion Hazard - Substitution of any component may impair suitability for Class , Division 2.
-
-
Warning - Explosion Hazard - Do not disconnect equipment while the circuit is live or unless the area is known to
be free of ignitable concentrations.
-
Do not open the cover of the PLC main unit and remove the battery unless the area is known to be
nonhazardous.
*1.
For details of the products confirming to the UL explosion-proof standard, refer to the following
manuals.
*2.
Only when connecting to FX5CPU module, FX
Groups A, B, C, and D.
Safety Precautions
(Read these precautions before use.)
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.
*2
MELSEC iQ-F FX5UC User's Manual (Hardware)
3U
(1)
and
may also cause severe injury.
-J1939 user's manual and
3U
MELSEC iQ-F FX5U User's Manual (Hardware)
-J1939 are suitable for use in Class , Division 2
.
Reference
20
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