SMC Networks CEP1 Series User manual

Doc. no. CE*-OMB0075-F
PRODUCT NAME
Precision MONOSASHI-KUN
(High Precision Stroke Reading Cylinder)
MODEL / Series / Product Number
CEP1* Series

1
Contents
1. Safety Instructions ·······································································2~6
2. Product Summary
2-1. System Configuration·································································7
2-2. How to Order············································································7
2-2-1. Precision MONOSASHI-KUN··············································7
2-2-2. Applicable Auto-Switch Models ···········································7
2-2-3. Options ··········································································8
2-3. Precautions on Selection······················································8
3. Specifications
3-1. Cylinder Specifications·······························································9
3-2. Sensor Specifications ································································9
4. Wiring
4-1. Connector Wiring Table···························································· 10
4-2. Wiring for CEU5······································································ 10
4-3. Noise countermeasures···························································· 10
5. Structure and Measuring Principle
5-1. Structure ··············································································· 11
5-2. Measuring Principle································································· 12
5-3. Relationship Between Pulse and Count······································· 12
6. Troubleshooting
6-1. Troubleshooting for Measuring Function································· 13~14
6-2. Troubleshooting for Cylinder Operation ······································· 14
Data: Outside dimensions of CEP1B12·············································· 15
Outside dimensions of CEP1B20·············································· 16

2
1.Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage. These
instructions indicate the level of potential hazard with the labels of “Caution,” “Warning” or “Danger.” They are all
important notes for safety and must be followed in addition to International Standards (ISO/IEC)*1), and other safety
regulations.
1) ISO 4414: Pneumatic fluid power - General rules and safety requirements for systems and their components
ISO 4413: Hydraulic fluid power - General rules and safety requirements for systems and their components
IEC 60204-1: Safety of machinery - Electrical equipment of machines - Part 1: General requirements
ISO 10218-1: Robots and robotic devices - Safety requirements for industrial robots - Part 1:Robots
etc.
Danger
Danger indicates a hazard with a high level of risk which, if not avoided, will result
in death or serious injury.
Warning
Warning indicates a hazard with a medium level of risk which, if not avoided, could
result in death or serious injury.
Caution
Caution indicates a hazard with a low level of risk which, if not avoided, could result
in minor or moderate injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the equipment or
decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific
equipment must be decided by the person who designs the equipment or decides its specifications based on
necessary analysis and test results. The expected performance and safety assurance of the equipment will be
the responsibility of the person who has determined its compatibility with the product. This person should also
continuously review all specifications of the product referring to its latest catalog information, with a view to
giving due consideration to any possibility of equipment failure when configuring the equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly. The assembly, operation and
maintenance of machines or equipment including our products must be performed by an operator who is
appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
1. The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent falling or runaway of the driven objects have been confirmed.
2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented
and the power from any appropriate source is cut, and read and understand the specific product precautions
of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Our products cannot be used beyond their specifications. Our products are not developed,
designed, and manufactured to be used under the following conditions or environments. Use
under such conditions or environments is not covered.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to
direct sunlight.
2. Use for nuclear power, railways, aviation, space equipment, ships, vehicles, military application, equipment
affecting human life, body, and property, fuel equipment, entertainment equipment, emergency shut-off
circuits, press clutches, brake circuits, safety equipment, etc., and use for applications that do not conform
to standard specifications such as catalogs and operation manuals.
3. Use for interlock circuits, except for use with double interlock such as installing a mechanical protection
function in case of failure. Please periodically inspect the product to confirm that the product is operating
properly.

3
1.Safety Instructions
Caution
We develop, design, and manufacture our products to be used for automatic control equipment, and
provide them for peaceful use in manufacturing industries.
Use in non-manufacturing industries is not covered.
Products we manufacture and sell cannot be used for the purpose of transactions or certification specified in the
Measurement Act.
The new Measurement Act prohibits use of any unit other than SI units in Japan.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance Requirements”.
Read and accept them before using the product.
Limited warranty and Disclaimer
1. The warranty period of the product is 1 year in service or 1.5 years after the product is delivered, whichever is
first.∗2)
Also, the product may have specified durability, running distance or replacement parts. Please consult your
nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our responsibility, a replacement
product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage incurred due to
the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and disclaimers noted in the
specified catalog for the particular products.
*2) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum pad or failure due to
the deterioration of rubber material are not covered by the limited warranty
Compliance Requirements
1. The use of SMC products with production equipment for the manufacture of weapons of mass destruction
(WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the relevant security
laws and regulations of the countries involved in the transaction. Prior to the shipment of a SMC product to
another country, assure that all local rules governing that export are known and followed.

4
Operating and Storage Environments
Warning
1. Envionments to avoid
Avoid using or storing the products in the
following environments which may cause failures.
If the products need to be used or stored in
those environments, take necessary measures.
a. Place where ambient temperature exceeds
the range of 0℃to 50℃.
b. Place where ambient humidity exceeds the
range of 35% to 85% RH.
c. Place where condensation occurs due to
sudden temperature change.
d. Place where atmosphere containing corrosive
gas, flammable gas or organic solvent.
e. Place where atmosphere containing
con-ductive powder such as dust and iron
chips, oil mist, salt, or organic solvent, or
splashing cutting chips, dust and cutting oil
(water , liquid) over the products.
f. Place where the products are exposed to
direct sunlight or radiated heat.
g. Place where strong electromagnetic noise is
generated (place where strong electric field,
strong magnetic field or surge is generated).
h. Place where static electricity is discharged or
condition that the products have electrostatic
discharge.
i. Place where strong high frequency is
gene-rated.
j. Place where damages of thunder are
expected.
k. Place where vibration or impact is directly
given to the products.
l. Condition that the products are deformed by
force or weight applied.
2. Do not close any objects which are affected
by magnets.
Since magnets are built in cylinders, do not close
magnetic disks, magnetic cards or magnetic
tapes. The data may be destroyed.
Precautions on Design
Warning
1. There is a possibility of dangerous sudden
action by cylinders if sliding parts of
machi-nery are twisted due to external forces,
etc.
In such cases, human injury may occur; e. g., by
catching hands or feet in the machinery, or
damage to the machinery itself may occur.
2. Provide a cover to minimize the risk of human
injury.
When a driven object or moving parts of a
cylinder may cause the risk of human injury,
design a structure to avoid contact with human
body.
3. Securely tighten all stationary parts and
connected parts of cylinders so that they will
not become loose.
Tighten cylinders securely especially when they
are used in high frequency or in locations where
direct vibration or impact shock, etc. will be
applied to the body of the cylinder.
4. Deceleration circuits or shock absorbers are
needed in some cases.
If a driven object travels at a high speed or is
heavy, impact will not be sufficiently absorbed
only with the cylinder cushion. In such cases, use
a circuit to decelerate the cylinder speed before
the cushion becomes effective or use external
shock absorbers to reduce impact. At this time,
take the rigidity of machinery into account.
5. Consider possible drop of pressure in circuit
due to power outage.
For cylinders used in clamping mechanism, a
work may become loose due to less clamping
force by pressure drop in circuit at the time of
power outage. Install safety devices to prevent
human injury and machinery damage. Measures
should be taken to prevent drop of hanging or
lifing equipment.
6. Consider possible loss of power sources.
Measures should be taken to protect against
human injury and machinery damage in the event
that there is a loss of air pressure, electricity or
hydraulic power.
7. Design circuit to prevent shooting out of a
driven object.
A driven object is quickly shot out when pressure
is supplied from one side of the piston after air in
the cylinder is exhausted in such cases that
cylinder is actuated by exhaust center type of
directional control valve or started after residual
air is exhausted from the circuit. At this time,
human injury may occur; e.g., by catching hands
or feet in the machinery, or damage to the
machinery itself may occur. Therefore, the
machine should be designed and constructed to
prevent shooting out.
8. Consider emergency stops.
Design the machinery so that human injury
and/or damage to machinery and equipment will
not be caused when machinery is stopped by a
safety device under abnormal conditions, a power
outage or a manual emergency stop.
9. Consider actions when operation is restarted
after an emergency stop or abnormal stop.
Design the machinery so that human injury or
equipment damage will not occur upon restart of
operation. When the cylinder is required to return
to the initial position, provide the equipment with
a safe override.
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5
Selection
Warning
1. Confirm the specifications.
The product in this manual is designed to be
used only in industrial compressed air system.
The product should not be used with pressures
or temperatures outside the range of the
specifications, as this may cause damage or
malfunction, etc.
2. Intermediate stop
When cylinder piston is stopped intermediately
by 3-position closed center type of directional
control valve, intermediate stop positions may
not be as precise and exact as hydraulic
operation due to compressibility of air. Valves
and cylinders are not guaranteed for zero air
leakage, and stop position may not be held in a
long period of time. Consult SMC for long term
holding of stop positions.
Caution
1. Mount speed controller and adjust cylinder
operation speed gradually from low speed to
a desired speed.
Air Supply
Warning
1. Do not use the product out of the specified
ranges for pressure and temperature to
pre-vent equipment damage and mal-function.
①Operating pressure:
12: 0.15 to 1.0 MPa
20: 0.1 to 1.0 MPa
②Fluid & ambient temperature: 0 to 60C
2. Use clean air.
Do not use the product with compressed air
includes chemicals, synthetic materials (including
organic solvents), salinity, corrosive gases, etc.,
as this may cause damage or malfunction.
Caution
1. Install air filter.
Install air filter before and in vicinity of valve. The
filter should be able to collect particles of 5
microns or smaller. A large quantity of drain may
cause malfunction of pneumatic components.
2. Install after cooler, air dryer, auto drain, etc.
Compressed air that includes excessive
condensate may cause malfunction of valve and
other pneumatic equipment. To prevent this,
install after cooler, air dryer, auto drain, etc.
Installation
Warning
1. Do not give torque to the piston rod.
Giving torque to the piston rod may cause
damage and malfunction.
2. Ensure that the equipment operates properly
before the use.
3. Operation manual
Do not install the products unless the safety
instruction have been read and understood.
Keep this operation manual on file for future
reference.
Caution
1. Maintenance space
When installing the products, allow space for
maintenance.
2. Installation of attachment
When hardware and nuts are screwed into the
piston rod end, the piston rod should be fully
retracted.
Use double nuts to fix a work since Precision
MONOSASHI-KUN (Stroke Reading Cylinder)
does not have any parallel parts at the rod.
3. Do not give strong impact and/or excessive
moment when work is mounted.
External force other than allowable moment may
cause rattle at guide part and/or increase in
sliding resistance.
4. Use the product in such a condition that load
is always applied in the axial direction of the
piston rod.
When load is applied in other directions than
cylinder axial direction, regulate the load itself by
the guide.
Perform a complete centering when cylinder is
mounted.
5. Avoid the use where torque is always applied
to the piston rod or excessive impact acts on.
6. Do not give any damage and gouge on the
sliding part of the piston rod.
Wiring
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6
Warning
1. Preparation for wiring
Shut off the power before wiring (including
insertion and removal of connectors). Mount a
protective cover on the terminal block after
wiring.
2. Check the power
Make sure the power has sufficient capacity and
voltages are within the specified range before
wiring.
3. Grounding
Ground terminal block F.G. (Frame Ground).
Do not ground it with devices generating strong
electromagnetic noise.
4. Check wiring
Incorrect wiring may cause damage or
malfunction of the products. Make sure the
wiring is correct before operation.
Caution
1. Separation of signal wires from power wire
Avoid common or parallel wiring of signal and
power wires to prevent malfunction due to noise.
2. Wiring arrangement and fixation
Avoid bending cables sharply at connector part
or electrical entry in wiring arrangement.
Inproper arrangement may cause disconnection
which in turn causes malfunction. Fix cables
close enough not to give excessive force to the
connector. Piping
Caution
1. Before piping
Remove cutting chips, cutting oil, dust, etc. in
piping by flushing or cleaning before piping. Care
should be taken especially that any cutting chips,
cutting oil, dust, etc. do not exist after a filter.
2. At piping
①Foreign matter should not enter. Entering of
foreign matter will cause malfunction.
②Cutting chips and sealing materials at piping
threads should not enter valves when piping
and fittings are screwed in. Leave 1.5 to 2
threads when seal tape is used.
Lubrication
Caution
1. Lubrication of cylinder
①This cylinder is pre-lubricated and can be used
without lubrication.
②In case of lubrication, use a equivalent of the
turbine oil type 1 ISO VG32. Once lubrication
is performed, it should be continued since the
initial lubricant flows out causing malfunction.
Sensor Unit
Caution
1. Do not remove the sensor unit.
The position and sensitivity of the sensor is
adjusted properly. Removing or replacing the
sensor may cause malfunction.
2. External magnetic field should be 14.5mT or
less.
Strong magnetic field in the vicinity may cause
malfunction since CEP1 sensor is magnetic type.
3. Do not pull sensor cable strongly.
Such action may cause failure.
4. Power supply line
Do not mount any switch or relay to power
supply line (12 VDC to 24 VDC).
Measurement
SMC products are not intended for use as
instruments for legal metrology.
Measurement instruments that SMC manufactures
or sells have not been qualified by type approval
tests relevant to the metrology (measurement) laws
of each country. Therefore, SMC products cannot
be used for business or certification ordained by the
metrology (measurement) laws of each country.
Maintenance and Check
Caution
1. Performing regular check
Check regularly that the products do not operate
with failures unsolved. Check should be done
by trained and experienced operators.
2. Dismantling of product and supply/exhaust
of compressed air.
Before dismantling, ensure that drop preventing
and runaway preventing treatments are properly
provided, shut the power source of air supplied,
and exhausts compressed air in the system.
When starting operation again, operate the
product with care after ensuring that a treatment
for preventing extrusion is properly provided.
3. Prohibition of disassembly and modification
To prevent accidents such as failures and
electric shocks, do not remove the cover to
perform disassembly or modification. If the
cover has to be removed, shut off the power
before removal.
4. Disposal
Request a special agent for handling industrial
waste to dispose the products.
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7
2. Product Summary
Precision MONOSASHI-KUN is a cylinder that has a built-in linear encoder.
The scale of the magnetic rod and magnetic sensor detects change in piston position, and pulse
signal is outputted with A/B quadrature pulse (90 ﾟnominal phase relationship). Position detection in
0.01 mm resolution is possible by inputting this signal to Multi-counter CEU5.
2-1 System Configuration
Precision MONOSASHI-KUN
ＣＥＰ１ Series
Multi-counter
ＣＥＵ５ Series
Extension Cable
ＣＥ１－Ｒ※※
2-2 How to Order
2-2-1 Precision MONOSASHI-KUN
ＣＥＰ１Ｂ１２－２５※※－Ａ９３※
Base part
number
Tube I. D.
Nil 0.5 m
L 3 m
B Directmounttype
L Foot type
F Rod side flange
12 φ12 equivalent
20 φ20 equivalent
Cable length
Mounting type
25, 50, 75, 100
Stroke(mm)
Nil w/ connector
Z w/o connector
Connector
Auto-switch type
(See below)
Auto-switch additional mark
《Made To Order》
Fluoro rubber packing：－ＸＣ２２ (Ex.) ＣＥＰ１Ｂ１２－５０－Ｆ９Ｎ－ＸＣ２２
2-2-2 Applicable Auto-Switch Models
Mark
Auto-Switch Model
Mark
Auto-Switch Model
Mark
Auto-Switch Model
A90
D-A90
M9N
D-M9N
M9NW
D-M9NW
A93
D-A93
M9P
D-M9P
M9PW
2-color
D-M9PW
A96
Reed
D-A96
M9B
Solid State
D-M9B
M9BW
Indication
Solid State
D-M9BW
A90V
Auto-Switch
D-A90V
M9NV
Auto-Switch
D-M9NV
M9NWV
Auto-Switch
D-M9NWV
A93V
D-A93V
M9PV
D-M9PV
M9PWV
D-M9PWV
A96V
D-A96V
M9BV
D-M9BV
M9BWV
D-M9BWV
M9NA
Waterproof
D-M9NA
M9PA
Waterproof
D-M9PA
M9BA
Waterproof
D-M9BA
M9NAV
D-M9NAV
M9PAV
D-M9PAV
M9BAV
D-M9BAV
See separate catalog for the details of Auto-switch.

8
2-2-3 Options
Multi Counter
ＣＥ１－Ｒ※※
Cable Length
Connector *1
Nil Without connector
C With connector
05 5m
10 10m
15 15m
20 20m
Extension Cable
*1) Connector (Female) is mounted on one side of
extension cable. Connector (Male) to be enclosed
with the mark “C” is the same type as that
mounted to standard CEP1.
ＣＥＵ５※※－※
Base part
number
Output to PC/ PLC
Output transistor type
Supply voltage
Nil 100 to 240 VAC
D 24VDC
Nil RS-232C
B RS-232C + BCD
Nil NPN
P PNP
2-3 Precautions on Selection
●Use Precision MONOSASHI-KUN CEP1 with Multi-Counter CEU5.
Stroke position is not indicated correctly with 3-Point Preset Counter CEU1.
●For SMC CEP1 series and SMC CEU5 series, operation check was performed with SMC
extension cable CE1-R※※ for the maximum wire length of 23m. Since operation check was not
performed with other counters and cables, a system designer who selects equipment should
check the operation.
(See “Countermeasures for Noise” on page 8.)
●When CEP1 with connector is used, extension cable CE1-R※is necessary. For this extension
cable, receptacle connector (female) for CEP1 connector (male) is attached.
●When extension cable is connected to CEP1 without connector, it is necessary to mount male
connector on cylinder side. Use CE1-R※C extension cable. For connector with mark “C”, one
piece of cylinder side connector (male) is enclosed.
●CEP1 without connector can be directly connected to terminal block of counter.
CE1-R00C
CE1-R05
CE1-R10
CE1-R15
CE1-R20
CE1-R*C

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3. Specifications
3-1 Cylinder Specifications
Model
CEP1B12
CEP1B20
Action
Double acting, single rod (Non-rotating piston rod)
Fluid
Air
Proof pressure
1.5MPa
Max. operating pressure
1.0MPa
Min. operating pressure
0.15 MPa
0.1 MPa
Operating piston speed
50~300mm/s
Ambient & fluid temperature
0~60゜（No freezing）
Humidity
25~85%RH（No dew condensation）
Lubrication
Non-lube.
Stroke tolerance range
0 ~ +1.0
Cushion
None
Rod non-rotating accuracy
±2°
±3°
Mounting
Rod side tapping, rod cover through-hole
Thread tolerance
JSI B0209
3-2 Sensor Specifications
Cable
φ7，6-core twisted pair shielding wire
(Heat resistance, oil resistance, flameproof)
Maximum wire length
23m＊１
Position detection method
Incremental encoder (rod with magnetic scale, magnetic sensor)
Magnetic field resistance
14.5mT
Power supply
12 VDC～24VDC (±10%) ［Power ripple: 1% or less］
Current consumption
50mA
Resolution
0.01mm （at four times multiplier）
Accuracy(20℃)
±0.02mm＊２
Output type
NPN Open collector （Max. 24 VDC, 40 mA or less）
Output signal
A/B quadrature pulse (90 ﾟnominal phase relationship)
Insulation resistance
500 VDC, 50MΩor more （Case: Between 12E）
Vibration proof
33.3 Hz, 6.8G, two hours each in X and Y directions, four hours
in Z direction, Conforming to JIS D1601
Impact resistance
30G, three times each in X, Y and Z directions
Enclosure
IP-67 （IEC standard）＊３
＊１） When SMC cable and SMC CEU5 counter are used.
＊２） Including error due to digital indication at Counter CEU5.
The overall measurement accuracy after being mounted to the equipment may vary depending
on the mounting state and environment. When accuracy of the equipment as a whole is required,
calibration should be performed by the end users.
＊３） Waterproof for that with cylinder except connector part.

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4. Wiring
4-1 Connector Wiring Table
The table below shows combinations of contact mark and wire core color. The connector pin layout
shows the layout of CEP1 with connector.
Combinations of contact mark and core color
Contact Mark
Core Color
Signal
Ａ
White
A-phase
Ｂ
Yellow
B-phase
Ｃ
Brown
ＣＯＭ(OV)
Ｄ
Blue
ＣＯＭ(OV)
Ｅ
Red
１２ VＤＣ
～２４ＶＤＣ
Ｆ
Black
０V
Ｇ
Shield
Shield
Ｈ
－
－
4-2 Wiring for CEU5
Monosashi-kun series
White
Blue
Yellow
Brown
n
Red
Black
Ａ
Ｂ
COM
COM
+12V
ＧＮＤ
Ｆ.Ｇ.
CEU5 sensor input part
Built-in sensor power
supply
12VDC, 60 mA
１ｋΩ
+12V
+12V
６８０Ω
１ｋΩ
+12V
+12V
６８０Ω
4-3 Noise countermeasures
Follow the instructions below to prevent malfunction due to noise.
1. Use SMC extension cable CE1-R** for wiring of MONOSASHI-KUN and CEU5.
2. Keep signal wires away from the power cables in wiring.
3. Mount a ferrite core to signal cables for possible radiated noise effects of cable.
4. Use stable power source for CEP1 power supply.
5. Mount a noise filter for possible noise effects of power source.
＊EMC Directive is satisfied by connecting the multi-counter(CEU5＊＊-D).
Please refer to the operation manual of the multi-counter for details.
The wiring for CEU5 and MONOSASHI-KUN
uses three twisted-pair cables.
Cable with shield
Ａ
Ｂ
Ｃ
Ｄ
Ｅ
Ｆ
Ｇ
Ｈ
Connector Pin Layout

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5. Structure and Measuring Principle
5-1 Structure
Sensor head
Rod cover
Boss cut ring
Piston rod
Scraper
Rod packing
Bush
Through-hole for mounting
Bush
Gasket
Rod packing
Ellipse piston
・A part of the piston rod has scale (magnetic scale). In order to maintain the relative position of the
scale and the sensor head, ellipse piston is used to have a structure of non-rotating cylinder.
Caution For the use of CEP1, care should be taken for the followings due to the structural
characteristics.
●Do not give torque to the piston rod.
Giving torque to the piston rod may cause sensor detection failure and cylinder malfunction.
●Use the product in such a condition that load is always applied in the axial direction of
the piston rod.
Offset load may cause abrasion of bearing and packing. In addition, measuring accuracy
may deteriorate.
●Do not remove the sensor.
The position and sensitivity of the sensor is adjusted properly. Removing or replacing the
sensor may cause malfunction.
●Do not pull sensor cable strongly.
Such action may cause detection failure and other failures.
●External magnetic field should be 14.5mT or less.
Strong magnetic field in the vicinity may cause malfunction since CEP1 sensor is magnetic
type.
This is equivalent to a field in a radius of about 18 cm from a welding part using
welding current of about 15000 amperes. When the product is used in stronger
magnetic filed, take some measures for shield by covering the sensor part with
magnetic material.
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5-2 Measuring Principle
Precision MONOSASHI-KUN is an air cylinder that has a function to output piston stroke movement
as pulse signal in 0.01 mm resolution (at four times multiplier). Measuring Principle is as follows.
Pitch
Magnetism part
Non-magnetism
part
Piston rod
Magnet
Magnetic resistive element
Amplification
& Interpolation
Circuit
Counter
①
②
0.00
0.08
0.04
A-phase
B-phase
Movement
Signal①
Signal②
Pitch
（１）Piston rod has scale consisting of magnetism layer and non-magnetism layer in 0.8 mm
pitch.
（２）Magnetic resistive element receives 2-phase signal(Signal①) of sin. and cos. by piston rod
movement. For this waveform, 1 pitch (0.8 mm) is equal to one cycle.
（３）This is amplified and divided into 1/20. As a result, 90phase difference pulse signal
(Signal②) is outputted, which is 0.04 mm per pulse.
（４）By counting this pulse by counter with four-quadrant multiplier, piston position can be
detected in 0.01 mm resolution.
5-3 Relationship Between Pulse and Count
CEP1 output is A/B quadrature pulse.
A-phase pulse
B-phase pulse
Count
11
12
multiplier
×４
５
９
10
８
０
１
２
３
４
６
７
５
11
10
９
８
７
６
４
Inversion
Traveling direction
of cylinder
①Rod extending
②Rod retracting
①In rod extending direction, A-phase turns on first, then B-phase turns on with the delay of
approximately 90phase difference.
②In rod retracting direction, B-phase turns on first, then A-phase turns on with the delay of
approximately 90phase difference. Counter performs addition in ①and does subtraction in ②.
When addition in rod retracting direction is needed, switch wiring of A-phase with B-phase.

13
6. Troubleshooting
6-1 Troubleshooting for Measuring Function
Failure
Cause
Countermeasure
Page of
reference
Does not
count.
Isn’t the wiring removed, or is it
correct?
Check the wiring and connector
loosening.
１０
Is 12VDC or 24VDC supplied to
the sensor?
Supply the rated power
(12VDC-24VDC) to the sensor.
Power other than the rated may
cause failure.
１０
(When CEU5 is used)
Is CEU5 in count mode?
Count values are indicated only in the
count mode.
Press the MODE key to change to
the count mode.
See the CEU5
operation
manual
(When other counter is used)
Counter setting is wrong.
If input mode switching is available
with the counter, check the setting.
Set the counter input to adding
/subtraction mode, 2-phase input (90
phase difference input).
See the operation
manual of the
counter.
Short-circuit of the sensor due to
entering of liquid or moisture.
Replacement of sensor unit is
necessary if the circuit is corroded. In
addition, take some countermeasures
to prevent liquid or moisture from
entering.
４
Sensor output circuit will
short-circuit if it is improperly wired
and current larger than the rated is
supplied.
If it failed, repair will be necessary.
Consult SMC or the shop.
９,１０
Measured
value does
not have
repro-ducibilit
y.
Counting speed of the counter is
slow or it does not meet the
requirements of the input
waveform.
(Depending on counter, counting
speed may slow down due to pulse
rise speed and duty conditions.)
CEU5 is recommended.
When a counter from other company
is used, check the requirements on
specifications.
１２
and
the operation
manual of the
counter.
Wiring distance is too long and
signal is attenuated.
(When counter and cable from
other companies are used, wiring
distance of 23 m is not
guaranteed.)
If the wiring is longer than 23m,
provide transducer of differential
input/output.
９
and
the operation
manual of the
counter.
Is there any noise source such as
large motor, AC type solenoid
valve, relay, inverter power and
others in the vicinity?
Take appropriate measures by
referring to “Countermeasures for
Noise”.
１０

14
Failure
Cause
Countermeasure
Page of
reference
Measured
value does
not have
repro-ducibilit
y.
Isn’t cylinder speed out of the
specified range?
When cylinder speed is too fast,
counting error may occur.
Knocking or bounding may also
cause temporal high speed.
Cylinder speed should be in the range
of 50 mm/s to 300 mm/s. In addition,
prevent knocking and bounding.
９
Is torque given to the piston rod?
If the relative position of the
sensor head and the scale is
displaced, detection failure may
be the result.
Do not give torque to the piston rod.
５,１１
6-2 Troubleshooting for Cylinder Operation
Failure
Cause
Countermeasure
Page of
reference
Cylinder
does not
operate.
Is air piping correct?
Check the piping.
Perform it after thoroughly reading the
precautions in Chapter 1.
５,６
Isn’t the orifice closed completely?
If the orifice is closed completely,
open it gradually until it is adjusted
properly.
５
Is torque given to the piston rod?
It causes malfunction due to
torsion of ellipse piston and the
sliding face.
Do not give torque to the piston rod.
When operation returns to normal,
repair will be required.
５,１１
Knocking
occurs.
Is cylinder speed within the
specified range?
Cylinder speed should be in the range
of 50 mm/s to 300 mm/s.
９
When it is connected to the guide
and other equipment, are they
centered completely?
Perform centering completely for the
connection of other equipment and
attachment.
５,１１
Is torque given to the piston rod?
It causes malfunction due to
torsion of ellipse piston and the
sliding face.
Do not give torque to the piston rod.
５,１１
Was lubrication once applied and
stopped afterward?
Use the product without lubrication.
Once lubrication is performed, it
should be continued since the initial
grease flows out.
６
Is the cylinder splashed with
solvents and chemicals?
Solvents and chemicals may
make grease flow out and affect
packing.
Do not use in an environment where
the product is splashed with solvents
and chemicals.
４,５

Revision history
First edition: March 1998
A: Revised in May 1999
B: Revised in July 2011
C: Revised in May 2013
D: Revised in March 2014
E: Revised in March 2023
F: Revised in February 2024
Tel: + 81 3 5207 8249 Fax: [phone]
URL https://www.smcworld.com
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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