RKC COM-B Instruction Manual
Communication level conversion module
1. MODEL
(1) COM-A : For conversion between RS-232C and RS-422A
(2) COM-B : For conversion between RS-232C and RS-485
COM-A/
FEB. 2007
NOTE
Ì
Make sure that this Instruction Manual is always readily available to personnel who use the SR Mini SYSTEM.
The contents of the Instruction Manual are subject to change without notice.
If only have any question regarding the manual, contact one of our sales
people, our nearest sales office, or the place whrere you have purchased this
SYSTEM. Also keep this manual with much care for future reference.
MARKING CAUTIONS
Ì
＜Signal wards＞
WARNING ：
Where there are possible dangers such as electric shock, fire (burns),
etc. which could cause loss of life or injury, precautions to avoid such
dangers are described.
CAUTION ：
These describe precautions to be taken if unit damage may result if
operating procedures are not strictly followed.
NOTE ：
Extra notes or precautions are added to operating procedures and
explanations.
＜Symbol Marks＞
Ï
：This mark is used when great care is needed especially
！
＊ ：This mark is used to add extra notes, precautions or
for safety.
supplementary explanations to table and figures.
COM-B
Ï
moduIe
WARNING
● Wiring precaution
・If failure or error of this instrument could result in a critical accident
of the system, install an external protection circuit to prevent such
an accident.
・In order to prevent instrument damage or failure, protect the power line
and the input/output lines from high currents by using fuses
with appropriate ratings.
● Power supply
・In order to prevent instrument damage or failure, supply power of
the specified rating.
・In order to prevent electric shock or instrument failure, do not turn on
the power supply until all of the wiring is completed.
● Never use the instrument near inflammable gases
・In order to prevent fire, explosion or instrument damage, never use
this instrument at a location where inflammable or explosive gases
or vapour exist.
● Never touch the inside of the instrument.
・In order to prevent electric shock or burns, never touch the inside of
the instrument. Only RKC service engineers can touch the inside
of the instrument to check the circuit or to replace parts.
High voltage and high temperature sections inside the instrument
are extremely dangerous.
● Never modify the instrument.
・In order to prevent accident or instrument failure, never modify
the instrument.
● Maintenance
・In order to prevent electric shock, burns or instrument failure, only
RKC service engineers may replace parts.
・In order to use this instrument continuously and safely, conduct periodic
maintenance. Some parts used in this instrument have a limited service
life and may deteriorate over time.
2. MOUNTING
！
In order to prevent electric shock or instrument failure,
always turn off the power before mounting or removing
the module.
In order to prevent electric shock o r instrument failure,
do not turn on the power before all the wiring is finished.
In order to prevent electric shock o r instrument failure,
do not touch the inside of the module or connector pins.
２.１ 設置環境
2.1 Mounting environment
Avoid the following when selecting the mounting location:
● Ambient temperature of less than 0℃ or more than 50℃.
●
Ambient humidity of less than 45% or more than 85% RH.
● Rapid changes in ambient temperature which may cause
condensation.
● Corrosive or inflammable gases .
●
Direct vibration or shock to the mainframe.
● Water, oil, chemicals, vapor or steam splashes.
●
Excessive dust, salt or iron particles.
● Excessive induction noise, static electricity, magnetic fields
or noise.
● Direct air flow from an air conditioner.
●
Should be used indoors where the system is not exposed to
direct sunlight.
2.2 Mounting considerations
Temperature considerations
●
Allow enough ventilation space.
● Do not mount this instrument directly above equipment which
generates heat (heaters, transformers, large resisters, etc.).
● If the ambient temperature rises above 50 ℃, cool the panel
inside using a forced fan or cooler. However, do not expose
the control unit directly to the air.
Humidity considerations
●
Condensation may from in the instrument due to rapid changes
in temperatures by turning the air conditioner ON or OFF.
Such condensation can cause instrument malfunctions due to
insulation deterioration or shorting.
To prevent the risk of codensation, always turn ON the power
or pre-heat the system using space heaters.
Panel vibration or shock considerations
●
Isolate the panel from external vibration or shock using rubber
vibration insulators.
●
If the electromagnetic switches cause vibration when they operate
within the panel, isolate the switches using rubber vibration
insulators.
Environment considerations
● If dust, steam, soot or poisonous gas exists, purge the panel
inside using clean air and create a slight positive pressure inside
the panel to keep out the harmful gases.
Operations and maintenance considerations
●
To ensure safety for maintenance and operation, separate the in-
strument from high-voltage equipment or rotating machinery
where possible.
Anti-noise considerations
● Do not install the instrument in a panel where high-voltage
equipment is installed.
● Separate the instrument from rotating machinery lines by more
than 200 mm.
(1)
！
！
！
2.3 Control unit mounting
(1) External dimensions
(Unit：mm）
(4) Direct mounting within panel
CAUTION
● If the COM module is mounted together with other modules,
always mount it at the left or right end of the control unit.
if it is mounted halfway at any position of the control unit,
other modules do not operate normally.
① Secure the mother block mounting space by referring to the mount-
ing dimension diagram.
② Separte the mother block from the module itself.
Mother block
(2) Dimensions for mounting within panel
2-M 3
77
Single type module
24 24 24 24 2424
77
(Unit：mm）
Module
Mother block
Upper sec tion
Module
Lower section
If the section marked with (removal lever) is lifted centering
around the upper module engagement while pressing the above section,
the module is separated from the mother block.
③ Before fixing the mother block to the mounting position,connect
each mother block. (Customer must provide the setscrews.)
Ｍ３×１０
Tightening torque (Recommended value) :
0.3N·m(3kgf·cm)
Dimensions for closely connected mounting
(3) Module mounting depth
Each module mounting depth is 108 mm from the mounting surface to
themodulefrontwhenthemoduleismountedontheDINrail.
However, if a connection cable (modular connector cable) is connected,
a longer mounting depth is required. Allow as much depth as possible
in consideration of each of operation and safety.
Approximately 50
108
(Unit：mm）
Mother block
④ Mount the module on the mother block.
After mounting the mother block, (1) insert the projection at the top
of the mother block into the hole at the top of module, (2) next, insert
the lower part of module into the mother block centering around the
section already inserted in item (1).
*Correctlyclipthemodulemainunitthemotherblocksurelysothat
a click sound is heard.
(1)
Top of module main unit
Single type module
Mother block
Module
(2)
Mother block
(2)
(5) Mounting on DIN rail
CAUTION
● If the COM module is mounted together with other modules,
always mount it at the left or right end of the control unit.
if it is mounted halfway at any position of the control unit,
other modules do not operate normally.
① Separate the mother block from the module itself.
② Lower the detaching lever at the part of the mother block. (1)
③ Insert the recess at the rear of the mother block into the upper
DIN rail. (2)
④ Lift the detaching lever. (3)
Confirm that the mother block is firmly inserted into the DIN
rails.
⑤ Slide the mother block, then connect each mother block using
a connector. (4)
(2)
(1)
(3) (3) (3)
Lever
⑥ Mount the module on the mother block.
⑦ Fix the control units using fixtures. (5) to (8)
(4)
(6)
4. WIRING
！
In order to prevent electric shock or instrument failure,
do not turn on the power before all the wiring is finished.
Wiring is necessary to be performed by personnel who
have a fundamental knowledge of electricity and also
experience in wiring.
4.1 Cautions for wiring
Wiring of input/output signal wire
● In order to avoid the effect of noise on the input/output signal
wires, use a separate power supply for electric equipment and
motors.
Wiring of power supply wire
● Separate each of the instrument power supply line, input/output
circuit power supply line, equipment and motor power supply line,
and operating circuit power supply line.
● Use the power supply within the power supply voltage variation
range.
● Use twisted power supply wire with a cross section of 1.25 mm
or more and a low voltage drop.
Wiring of grounding wire
● Do not ground the instrument together with other equipment.
● Do not mix this grounding wire with other grounding wires.
Ground this grounding wire to a grounding resistance of less
than 100 Ω.
● Usegroundingwirewithacrosssectionof2.0mm ormore.
4.2 wiring
① Modular connector 1 (COM.PORT1)
This is a connector for connection with the RS-232C interface.
！
2
2
(5)
Fixtures
(5)Attach the fixture on the DIN rail from the bottom as shown.
(6)Then fit the top of the fixture on the DIN rail .
(7)After the fit the top of the fixture is snugly attached to the top of the
DIN rail.
(8)Tighten the screw with a screwdriver.
(8)
3. NAME OF PARTS
3.1 Name of parts
④
⑤
① Modular connector 1 (COM.PORT1)
⑥
①
②
For RS-232C communication.
② Modular connector 2 (COM.PORT2)
For RS-422A/RS-485 communication.
③ Power connector
④ Data correctly received indicator lamp (Yellow)
Lights when data is correctly received.
③
⑤ Data correctly sent indicator lamp (Yellow)
Lights when data is correctly sent.
⑥ Power indicator lamp (Green)
Lights when module is turned on.
(7)
② Modular connector 2 (COM.PORT2)
This is a connector for connection with the RS-422A/RS-485
interface.
● For details on how to connect the modular connector,
See "5. CONNECTION METHODS ".
③ Power connector
1
100 to 240V AC
2
3
4
5
Grounding termina
(Grounding resistance : Less than 100 Ω)
！
Power
terminals
l
Power supply
● power supply : 100 to 240V AC
● Power supply voltage variation : 90 to 264V AC
● Power consumption : 5 VA or less (at 264V AC)
NOTE
● Recommended cable size : AWG 24 to 12
10 mm (Stripping length)
● Recommended torque : 0.5 to 0.6 N･m(5to6kgf･cm)
(3)