Mitsubishi Electric MELSEC Q Series User manual

MELSEC-Q C Controller Module User's Manual
-Q24DHCCPU-V
-Q24DHCCPU-VG
-Q24DHCCPU-LS
-Q26DHCCPU-LS
-Q12DCCPU-V(Extended mode)

1
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.
Make sure that the end users read this manual and then keep the manual in a safe place for future
reference.
[Design Precautions]
WARNING
●Configure safety circuits external to the C Controller module to ensure that the entire system
operates safely even when a fault occurs in the external power supply or the C Controller module.
Failure to do so may result in an accident due to an incorrect output or malfunction.
(1) Configure external safety circuits, such as an emergency stop circuit, protection circuit, and
protective interlock circuit for forward/reverse operation or upper/lower limit positioning.
(2) If the following status (a) or (b) occurs, the system will behave accordingly.
(a)When overcurrent or overvoltage protection of the power supply module is activated, the
outputs (Y) from the user program and writing to the buffer memory are disabled, and all
outputs are turned off.
(b)When the C Controller module detects an error such as a watchdog timer error by the
selfdiagnostic function, the outputs (Y) from the user program and writing to the buffer
memory are disabled. Whether to hold or turn off all outputs can be set by parameters.
All outputs may turn on when an error occurs in the part, such as I/O control part, where the C
Controller 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 C Controller module. For a fail-safe circuit
example, refer to "Page 493, Appendix 11".
(3) Outputs may remain on or off due to a failure of an output module relay or transistor. Configure
an external circuit for monitoring output signals that could cause a serious accident.
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.

2
[Design Precautions]
WARNING
●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 C Controller system 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.
●When there are communication problems with the data link, refer to the corresponding data link
manual for the operating status of each station. Incorrect output or malfunction may result in an
accident.
●When connecting a peripheral device to the CPU module or connecting a personal computer or the
like to the intelligent function module to exercise control (data change) on the running C Controller
module, configure up an interlock circuit in the user program to ensure that the whole system will
always operate safely. Also before exercising other control (program change, operating status
change (status control)) on the running C Controller module, read the manual carefully and fully
confirm safety. Especially for the above control on the remote C Controller module from an external
device, an immediate action may not be taken for C Controller module trouble due to a data
communication fault. In addition to configuring up the interlock circuit in the user program, corrective
and other actions to be taken as a system for the occurrence of a data communication fault should
be predetermined between the external device and CPU module.
●Do not write data into the write-protected area within the intelligent function module buffer memory.
Further, do not output (ON) prohibited signals in the output signals from the CPU module to the
intelligent function module. Writing data to the write-protected area or output of prohibited signals
may cause malfunction of the C Controller system.
●For the write-protected area and prohibited signals, refer to the User's Manual for each intelligent
function module.
●If the communication cable is disconnected, the line becomes unstable and any communication
problem may occur in multiple stations of the network. Even if any network communication problem
occurs in the multiple stations, configure up an interlock circuit in the user program to ensure safe
operation of the system. Failure to do so may result in an accident due to an incorrect output or
malfunction.
●In the refresh parameter settings, "Y" cannot be specified for link output (LY) refresh device and
remote output (RY) refresh device. Therefore, the device prior to STOP remains in the event of CPU
STOP.

3
[Design Precautions]
[Security Precautions]
CAUTION
●Do not install the control lines or communication cables together with the main circuit lines or power
cables. Keep a distance of 100mm (3.94 inches) or more between them. Failure to do so may result
in malfunction due to noise.
● When a device such as a lamp, heater, or solenoid valve is controlled through an output module, a
large current (approximately ten times greater than normal) may flow when the output is turned from
off to on. Take measures such as replacing the module with one having 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 setting, and/or program size. Design circuits so
that the entire system will always operate safely, regardless of the time.
●While registering various settings, do not power OFF the station with a module installed, and reset
the CPU module. Powering off the station with a module installed and registering the CPU module
during registration make the internal ROM setting data uncertain and re-setting and re-registration
are required. Moreover, it will result in module fault and malfunction.
●When the CPU module or remote I/O module parameters are modified, be sure to reset the CPU
module. Previous data remaining in the module may cause the module to fail or malfunction.
WARNING
●To maintain the security (confidentiality, integrity, and availability) of the programmable controller and
the system against unauthorized access, denial-of-service (DoS) attacks, computer viruses, and
other cyberattacks from external devices via the network, take appropriate measures such as
firewalls, virtual private networks (VPNs), and antivirus solutions.

4
[Installation Precautions]
CAUTION
●Use the C Controller module in an environment that meets the general specifications in this manual.
Failure to do so may result in an electric shock, fire, malfunction, or damage to or deterioration of the
product.
●To mount the module, while pressing the module mounting lever located in the lower part of the
module, fully insert the module fixing projection(s) into the hole(s) in the base unit and press the
module until it snaps into place.Incorrect mounting may cause malfunction, failure or drop of the
module.When using the module in an environment of frequent vibrations, fix the module with a
screw.
For any module with module fitting(s), place each module on the base unit first and then fix it with the
module fitting(s).
●Tighten the screw within the specified torque range. Undertightening can cause drop of the screw,
short circuit or malfunction. Overtightening can damage the screw and/or module, resulting in drop,
short circuit, or malfunction.
●When using an extension cable, connect it to the connector of the base unit or module securely.
Check the connection for looseness. Poor contact may cause incorrect input or output.
●When using a SD memory card, fully insert it into the slot. Check that it is inserted completely. Poor
contact may cause malfunction.
●When using a CompactFlash card, fully insert it into the CompactFlash card slot. Check that it is
inserted completely. Poor contact may cause malfunction.
●Shut off the external power supply for the system in all phases before mounting or removing the
module. Failure to do so may result in damage to the product. The system using a CPU module
ready for the online module change, and the MELSECNET/H remote I/O station are exchangeable in
the online state (while power is on). However, there are limited number of modules that are
exchangeable in the online state (while power is on) and a replacement procedures is defined for
each module. For details, refer to the QCPU User's Manual (Hardware Design, Maintenance and
Inspection) and the online module change section in the respective manual for each online
exchangeable module.
●Do not directly touch any conductive part of the module. Doing so can cause malfunction or failure of
the module.
●When using the Motion CPU module and the Motion module, be sure to check if the module
combination is correct before powering up. Use of improper combination may result in damage to the
product. For details, refer to the User's Manual for the module used.

5
[Wiring Precautions]
WARNING
●Shut off the external power supply for the system in all phases before installation and wiring. Failure
to do so may result in electric shock or damage to the product.
●After wiring, attach the included terminal cover to the module before turning it on for operation.
Failure to do so may result in electric shock.
CAUTION
●Ground the FG and LG terminals to the protective ground conductor dedicated to the C controller
module. Failure to do so may result in electric shock or malfunction.
●Use compatible solderless terminals and tighten them to the specified torque. Use of lead-type
solderless terminals may cause the terminal screws be loosened, leading to a 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.
●Crimp, weld or properly solder the external connectors and co-axial cable connectors with tools
specified by the manufacturer. Incomplete connections could result in short circuit, fire or
malfunction.
●Do not install the control lines or the communication cables together with the main circuit lines or
power cables.
It should be at least 100 mm apart.Doing so may result in malfunction due to noise.
●Be sure to place in a duct or fix by clamps the power cords and cables connected to the module. If
not, dangling cable may swing or inadvertently be pulled, resulting in damage to the module or
cables or malfunctions due to poor contact.
●Tightening torque for the terminal screws should be in the specified range. Undertightening the
terminal screws can cause short circuit, fire or malfunction. Overtightening can damage the terminal
screw and/or module, resulting in drop, short circuit, or malfunction.

6
[Wiring Precautions]
[Startup and Maintenance Precautions]
CAUTION
●Tightening torque for the connector mounting screws should be in the specified range.
Undertightening the screws can cause short circuit, fire or malfunction. Overtightening can damage
the screw and/or module, resulting in drop, short circuit, fire or malfunction.
●Securely install connectors to the module. Improper installation can cause malfunction.
●When disconnecting a cable from the module, do not hold and pull the cable part.For a cable with
connector, hold the connected connector by hand to disconnect the cable. For terminal block cables,
loosen the terminal block terminal screws first. Pulling the cable while being connected to the module
will result in malfunction or damage to the module or the cable.
●Check the type of interface to connect in advance in order to properly connect cables. Connection or
wiring to wrong interface can cause a failure of the module and external device.
●Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can
cause a fire, failure, or malfunction.
●To prevent foreign matters such as wire chips from entering into the module during wiring, a sealing
label is attached to the top of the module. During wiring, do not remove this label. During system
operation, be sure to remove this label to release the heat.
●Use the C Controller module as being installed in the control panel. Let the main power wiring
through the relay terminal block to the PLC power supply unit installed in the control panel. Further,
replacement and wiring of the power supply module must be performed by maintenance personnel
fully trained for electric shock protection. For wiring procedures, refer to the QCPU User's Manual
(Hardware Design, Maintenance and Inspection).
WARNING
●Do not touch any terminal while power is on. Doing so will cause electric shock.
●Correctly connect the battery connector. Do not charge, disassemble, heat, short-circuit, solder, or
throw the battery into the fire. Doing so will cause the battery to produce heat, explode, or ignite,
resulting in injury and fire.
●Shut off the external power supply for the system in all phases before cleaning the module or
retightening the terminal screws or module fixing screws. Failure to do so may result in electric
shock, module failure or malfunction. Undertightening the terminal screws can cause resulting in
drop, short circuit or malfunction. Overtightening can damage the screw and/or module, resulting in
drop, short circuit, or malfunction.

7
[Startup and Maintenance Precautions]
CAUTION
●When connecting a peripheral device to the CPU module or connecting a personal computer or the
like to the intelligent function module to exercise control (data change) on the running C Controller
module, configure up an interlock circuit in the user program to ensure that the whole system will
always operate safely. Also before exercising other control (program change, operating status
change (status control)) on the running C Controller module, read the manual carefully and fully
confirm safety. Especially for the above control on the remote C Controller module from an external
device, an immediate action may not be taken for C Controller module trouble due to a data
communication fault. In addition to configuring up the interlock circuit in the user program, corrective
and other actions to be taken as a system for the occurrence of a data communication fault should
be predetermined between the external device and CPU module.
●Do not disassemble or modify the modules. 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 (9.85 inches) away in all directions from the C Controller module. Failure to
do so may cause malfunction.
●Shut off the external power supply for the system in all phases before mounting or removing the
module. Failure to do so may cause the module to fail or malfunction. The system using a CPU
module ready for the online module change, and the MELSECNET/H remote I/O station are
exchangeable in the online state (while power is on). However, there are limited number of modules
that are exchangeable in the online state (while power is on) and a replacement procedures is
defined for each module. For details, refer to the QCPU User's Manual (Hardware Design,
Maintenance and Inspection) and the online module change section in the respective manual for
each online exchangeable module.
●After the first use of the product, 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, the number of insertions/removals is limited to 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.
●Startup and maintenance inside the control panel must be performed by maintenance personnel fully
trained for electric shock protection. Further, take measures to prevent any person other than
maintenance personnel from operating the control panel, e.g. locking the control panel.
●Before handling the module, touch a grounded metal object to discharge the static electricity from
the human body. Failure to do so may cause the module to fail or malfunction.
●After first use of the product, do not install or remove the SD memory card more than 500 times.
Exceeding the limit of 500 times may cause malfunction.

8
[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 of battery regulations in the EU countries, refer to the QCPU User's Manual (Hardware
Design, Maintenance and Inspection).)
CAUTION
●When transporting lithium batteries, follow the transportation regulations. (For details of subject
models, refer to the QCPU User's Manual (Hardware Design, Maintenance and Inspection).)