Mitsubishi Electric MELSEC-L02SCPU User manual

MELSEC-L CPU Module User's Manual

(Built-In I/O Function)

-L02SCPU

-L02SCPU-P

-L02CPU

-L02CPU-P

-L06CPU

-L06CPU-P

-L26CPU

-L26CPU-P

-L26CPU-BT

-L26CPU-PBT

SAFETY PRECAUTIONS

(Read these precautions before using this product.)

Before using this product, please read this manual and the relevant manuals carefully and pay full attention

to safety to handle the product correctly.

In this manual, the safety precautions are classified into two levels: " WARNING" and " CAUTION".

Under some circumstances, failure to observe the precautions given under " CAUTION" may lead to

serious consequences.

Observe the precautions of both levels because they are important for personal and system safety.

Make sure that the end users read this manual and then keep the manual in a safe place for future

reference.

WARNING

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 minor or moderate injury or property damage.

[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) Emergency stop circuits, protection circuits, and protective interlock circuits for conflicting

operations (such as forward/reverse rotations or upper/lower limit positioning) must be configured

external to the programmable controller.

(2) Machine OPR (Original Point Return) of the positioning function is controlled by two kinds of data:

an OPR direction and an OPR speed. Deceleration starts when the near-point dog signal turns on.

If an incorrect OPR direction is set, motion control may continue without deceleration. To prevent

machine damage caused by this, configure an interlock circuit external to the programmable

controller.

(3) When the CPU module detects an error during control by the positioning function, the motion

slows down and stops.

(4) When the programmable controller detects an abnormal condition, it stops the operation and all

outputs are:

• Turned off if the overcurrent or overvoltage protection of the power supply module is activated.

• Held or turned off according to the parameter setting if the self-diagnostic function of the CPU

module detects an error such as a watchdog timer error.

(5) All outputs may be turned on if an error occurs in a part, such as an 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 "General Safety Requirements" in the MELSEC-L CPU Module User's Manual

(Hardware Design, Maintenance and Inspection).

(6) Outputs may remain on or off due to a failure of a component such as a transistor in an output

circuit. Configure an external circuit for monitoring output signals that could cause a serious

accident.

●In an output circuit, when a load current exceeding the rated current or an overcurrent caused by a

load short-circuit flows for a long time, it may cause smoke and fire. To prevent this, configure an

external safety circuit, such as a fuse.

●Configure a circuit so that the programmable controller is turned on first and then the external power

supply. If the external power supply is turned on first, an accident may occur due to an incorrect output

or malfunction.

●For the operating status of each station after a communication failure, refer to relevant manuals for

each network. Incorrect output or malfunction due to a communication failure may result in an

accident.

[Design Precautions]

WARNING

●When changing data from a peripheral device connected to the CPU module during operation,

configure an interlock circuit in the program to ensure that the entire system will always operate safely.

For other forms of control (such as program modification or operating status change) of a running

programmable controller, read the relevant manuals carefully and ensure that the operation is safe

before proceeding. Especially, when a remote programmable controller is controlled by an external

device, immediate action cannot be taken if a problem occurs in the programmable controller due to a

communication failure. To prevent this, configure an interlock circuit in the program, and determine

corrective actions to be taken between the external device and CPU module in case of a

communication failure.

●An absolute position restoration by the positioning function may turn off the servo-on signal (servo off)

for approximately 20ms, and the motor may run unexpectedly. If this causes a problem, provide an

electromagnetic brake to lock the motor during absolute position restoration.

CAUTION

●Do not install the control lines or communication cables together with the main circuit lines or power

cables. Keep a distance of 100mm or more between them. Failure to do so may result in malfunction

due to noise.

●During control of an inductive load such as a lamp, heater, or solenoid valve, a large current

(approximately ten times greater than normal) may flow when the output is turned from off to on.

Therefore, use a module that has a sufficient current rating.

●After the CPU module is powered on or is reset, the time taken to enter the RUN status varies

depending on the system configuration, parameter settings, and/or program size. Design circuits so

that the entire system will always operate safely, regardless of the time.

[Installation Precautions]

[Wiring Precautions]

WARNING

●Shut off the external power supply (all phases) used in the system before mounting or removing a

module. Failure to do so may result in electric shock or cause the module to fail or malfunction.

CAUTION

●Use the programmable controller in an environment that meets the general specifications in the

MELSEC-L CPU Module User's Manual (Hardware Design, Maintenance and Inspection). Failure to

do so may result in electric shock, fire, malfunction, or damage to or deterioration of the product.

●To interconnect modules, engage the respective connectors and securely lock the module joint levers

until they click. Incorrect interconnection may cause malfunction, failure, or drop of the module.

●Do not directly touch any conductive parts and electronic components of the module. Doing so can

cause malfunction or failure of the module.

●Securely connect an extension cable to the connectors of a branch module and an extension module.

After connections, check that the cable is inserted completely. Poor contact may cause malfunction.

●When using an SD memory card, fully insert it into the SD memory card slot. Check that it is inserted

completely. Poor contact may cause malfunction.

●Do not directly touch any conductive parts and electronic components of the module or SD memory

card. Doing so can cause malfunction or failure of the module.

WARNING

●Shut off the external power supply (all phases) used in the system before wiring. Failure to do so may

result in electric shock or cause the module to fail or malfunction.

●After installation and wiring, attach the included terminal cover to the module before turning it on for

operation. Failure to do so may result in electric shock.

[Wiring Precautions]

CAUTION

●Individually ground the FG terminal of the programmable controller with a ground resistance of 100

or less. Failure to do so may result in electric shock or malfunction.

●Use applicable solderless terminals and tighten them within the specified torque range. If any spade

solderless terminal is used, it may be disconnected when a terminal block screw comes loose,

resulting in failure.

●Check the rated voltage and terminal layout before wiring to the module, and connect the cables

correctly. Connecting a power supply with a different voltage rating or incorrect wiring may cause a fire

or failure.

●Connectors for external devices must be crimped or pressed with the tool specified by the

manufacturer, or must be correctly soldered. Incomplete connections may cause short circuit, fire, or

malfunction.

●Securely connect the connector to the module.

●Do not install the control lines or communication cables together with the main circuit lines or power

cables. Failure to do so may result in malfunction due to noise.

●Place the cables in a duct or clamp them. If not, dangling cable may swing or inadvertently be pulled,

resulting in damage to the module or cables or malfunction due to poor contact.

●Check the interface type and correctly connect the cable. Incorrect wiring (connecting the cable to an

incorrect interface) may cause failure of the module and external device.

●Tighten the terminal block screws within the specified torque range. Undertightening can cause short

circuit, fire, or malfunction. Overtightening can damage the screw and/or module, resulting in drop,

short circuit, or malfunction.

●When disconnecting the cable from the module, do not pull the cable by the cable part. For the cable

with connector, hold the connector part of the cable. For the cable connected to the terminal block,

loosen the terminal screw. Pulling the cable connected to the module may result in malfunction or

damage to the module or cable.

●Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can

cause a fire, failure, or malfunction.

●A protective film is attached to the top of the module to prevent foreign matter, such as wire chips,

from entering the module during wiring. Do not remove the film during wiring. Remove it for heat

dissipation before system operation.

●To use the high-speed counter function, ground the shield cable on the encoder side (relay box).

Always ground the FG and LG terminals to the protective ground conductor. Failure to do so may

cause malfunction.

●Mitsubishi programmable controllers must be installed in control panels. Connect the main power

supply to the power supply module in the control panel through a relay terminal block.

Wiring and replacement of a power supply module must be performed by qualified maintenance

personnel with knowledge of protection against electric shock.

For wiring methods, refer to the MELSEC-L CPU Module User's Manual (Hardware Design,

Maintenance and Inspection).

[Startup and Maintenance Precautions]

WARNING

●Do not touch any terminal while power is on. Doing so will cause electric shock or malfunction.

●Correctly connect the battery connector. Do not charge, disassemble, heat, short-circuit, solder, or

throw the battery into the fire. Also, do not expose it to liquid or strong shock.

Doing so will cause the battery to produce heat, explode, ignite, or leak, resulting in injury and fire.

●Shut off the external power supply (all phases) used in the system before cleaning the module or

retightening the terminal block screws. Failure to do so may result in electric shock.

CAUTION

●Before performing online operations (especially, program modification, forced output, and operating

status change) for the running CPU module from the peripheral device connected, read relevant

manuals carefully and ensure the safety. Improper operation may damage machines or cause

accidents.

●Do not disassemble or modify the module. Doing so may cause failure, malfunction, injury, or a fire.

●Use any radio communication device such as a cellular phone or PHS (Personal Handy-phone

System) more than 25cm away in all directions from the programmable controller. Failure to do so

may cause malfunction.

●Shut off the external power supply (all phases) used in the system before mounting or removing a

module. Failure to do so may cause the module to fail or malfunction.

●Tighten the terminal block screws within the specified torque range. Undertightening can cause drop

of the component or wire, short circuit, or malfunction. Overtightening can damage the screw and/or

module, resulting in drop, short circuit, or malfunction.

●After the first use of the product (module, display unit, and terminal block), the number of

connections/disconnections is limited to 50 times (in accordance with IEC 61131-2). Exceeding the

limit may cause malfunction.

●After the first use of the SD memory card, do not insert/remove the memory card more than 500 times.

Exceeding the limit may cause malfunction.

●Do not drop or apply shock to the battery to be installed in the module. Doing so may damage the

battery, causing the battery fluid to leak inside the battery. If the battery is dropped or any shock is

applied to it, dispose of it without using.

●Before handling the module, touch a conducting object such as a grounded metal to discharge the

static electricity from the human body. Failure to do so may cause the module to fail or malfunction.

●Before testing the operation by the positioning function, set a low speed value for the speed limit

parameter so that the operation can be stopped immediately upon occurrence of a hazardous

condition.

[Disposal Precautions]

[Transportation Precautions]

CAUTION

●When disposing of this product, treat it as industrial waste. When disposing of batteries, separate

them from other wastes according to the local regulations. (For details on battery regulations in EU

member states, refer to the MELSEC-L CPU Module User's Manual (Hardware Design, Maintenance

and Inspection).)

CAUTION

●When transporting lithium batteries, follow the transportation regulations. (For details on the regulated

models, refer to the MELSEC-L CPU Module User's Manual (Hardware Design, Maintenance and

Inspection).)

CONDITIONS OF USE FOR THE PRODUCT

(1) Mitsubishi programmable controller ("the PRODUCT") shall be used in conditions;

i) where any problem, fault or failure occurring in the PRODUCT, if any, shall not lead to any major or serious accident;

and

ii) where the backup and fail-safe function are systematically or automatically provided outside of the PRODUCT for the

case of any problem, fault or failure occurring in the PRODUCT.

(2) The PRODUCT has been designed and manufactured for the purpose of being used in general industries.

MITSUBISHI SHALL HAVE NO RESPONSIBILITY OR LIABILITY (INCLUDING, BUT NOT LIMITED TO ANY AND ALL

RESPONSIBILITY OR LIABILITY BASED ON CONTRACT, WARRANTY, TORT, PRODUCT LIABILITY) FOR ANY

INJURY OR DEATH TO PERSONS OR LOSS OR DAMAGE TO PROPERTY CAUSED BY the PRODUCT THAT ARE

OPERATED OR USED IN APPLICATION NOT INTENDED OR EXCLUDED BY INSTRUCTIONS, PRECAUTIONS, OR

WARNING CONTAINED IN MITSUBISHI'S USER, INSTRUCTION AND/OR SAFETY MANUALS, TECHNICAL

BULLETINS AND GUIDELINES FOR the PRODUCT.

("Prohibited Application")

Prohibited Applications include, but not limited to, the use of the PRODUCT in;

• Nuclear Power Plants and any other power plants operated by Power companies, and/or any other cases in which the

public could be affected if any problem or fault occurs in the PRODUCT.

• Railway companies or Public service purposes, and/or any other cases in which establishment of a special quality

assurance system is required by the Purchaser or End User.

• Aircraft or Aerospace, Medical applications, Train equipment, transport equipment such as Elevator and Escalator,

Incineration and Fuel devices, Vehicles, Manned transportation, Equipment for Recreation and Amusement, and

Safety devices, handling of Nuclear or Hazardous Materials or Chemicals, Mining and Drilling, and/or other

applications where there is a significant risk of injury to the public or property.

Notwithstanding the above restrictions, Mitsubishi may in its sole discretion, authorize use of the PRODUCT in one or

more of the Prohibited Applications, provided that the usage of the PRODUCT is limited only for the specific

applications agreed to by Mitsubishi and provided further that no special quality assurance or fail-safe, redundant or

other safety features which exceed the general specifications of the PRODUCTs are required. For details, please

contact the Mitsubishi representative in your region.

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