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CES-AR-CL2-AH
User Manual
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EUCHNER CES-AR-CL2-AH User Manual

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Operating Instructions
Non-Contact Safety Switch
CES-AR-CR2-AH (Unicode)
CES-AR-CL2-AH (Unicode)
More than safety.
Operating Instructions Safety Switches CES-AR-C.2-AH
Contents
2
Operating Instructions Safety Switches CES-AR-C.2-AH
Correct use
The Coded Electronic Safety switches series CES are safety devices for monitor­ing movable safety guards.
In combination with a separating safety guard and the machine control, this safety  component  prevents dangerous machine movements from  occurring  while  the  safety guard is open. A stop command is triggered if the safety guard is opened  during the dangerous machine function. 
Before safety switches are used, a risk assessment must be performed on the  machine, e.g., in accordance with:
 Ì EN ISO 13849-1, Safety of machinery. Safety related parts of control systems. 
General principles for design
 Ì EN ISO 12100, Safety of machinery – General principles for design – Risk as-
sessment and risk reduction
 Ì IEC 62061, Safety of machinery. Functional safety of safety-related electrical, 
electronic and programmable electronic control systems.
Correct use  includes  compliance  with  the relevant requirements for installation  and operation, for example
Important!
 Ì EN ISO 13849-1, Safety of machinery. Safety related parts of control systems. 
General principles for design
 Ì EN 1088, Safety of machinery. Interlocking devices associated with guards. 
Principles for design and selection
 Ì EN 60204-1, Safety of machinery. Electrical equipment of machines. General 
requirements
 Ì EN 60947-5-3, Specification for low-voltage switchgear and controlgear. Con-
trol circuit devices and switching elements. Requirements for proximity devices  with defined behaviour under fault conditions
The safety switch must be used only in conjunction with the designated CES ac­tuators from EUCHNER. On the use of different actuators, EUCHNER provides no  warranty for safe function.
Several devices are only allowed to be connected in series using devices intended  for  series  connection  with  the  CES-AR.  Check  the  operating  instructions  for  the  related device. A combination of other CES devices or devices from other manu­facturers is not allowed.
A maximum of 20 safety switches are allowed to be operated in a switch chain. 
 Ì The user is responsible for the integration of the device into a safe overall 
system. For this purpose, the overall system must be validated, e.g. in ac­cordance with EN ISO 13849-2.
 Ì Correct use requires observing the permissible operating parameters (see 
Technical data).
 Ì If a product data sheet is included with the product, the information on the 
data sheet applies in case of discrepancies with the operating instructions.
 Ì In the estimation of the PL for the overall system, a maximum value of 
100 years can be assumed for the MTTFd according to the limit value in  EN ISO 13849-1:2008, section 4.5.2. This corresponds to a minimum value  for the PFHd of 2.47x10-8/h. 
 Ì When up to 11 devices are connected in series, these limit values can be 
assumed for the entire switch chain as a subsystem. As a subsystem, this  switch chain achieves PL e. 
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Operating Instructions Safety Switches CES-AR-C.2-AH
Important!
Safety switch
Door hinge right
CES-AR-CR2-AH
Door hinge left
CES-AR-CL2-CH
 Ì In the case of series connection of more than 11 devices, the PFH
calculated according to one of the stated methods in EN ISO 13849-1:2008,  Section 4.5.1. 
 Ì If the simplified method according to Section 6.3 of EN ISO 13849:2008-12 
is used for validation, the Performance Level (PL) might be reduced when  more than 11 devices are connected in series.
 Ì It is only allowed to use components that are permissible in accordance with 
the table below.
Possible combinations for CES components
Actuator
Door hinge right
CES-A-BLN-R2-100776
100776
Door hinge left
CES-A-BLN-L2-104510
104510
Usage independent of position of door hinge
CES-A-BLN-U2-103450
103450
Usage independent of position of door hinge
CES-A-BDN-06-104730
104730
 can be 
d
Key to symbols
Combination possible
Note!
Devices with version number V 1.1.2 or higher can be operated on an AR evalua­tion unit. Please refer to the operating instructions for the relevant AR evaluation  unit for more information.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Exclusion of liability and warranty
In case of failure to comply with the conditions for correct use stated above, or  if the safety instructions are not followed, or if any servicing is not performed as  required, liability will be excluded and the warranty void.
General safety instructions
Safety switches fulfill personal protection functions. Incorrect installation or tamper­ing can lead to fatal injuries to personnel.
Check the safe function of the safety guard particularly
 Ì after any setup work  Ì after the replacement of a CES component  Ì after an extended period without use  Ì after every fault
Independent  of  these  checks, the safe function of the safety guard should be  checked at suitable intervals as part of the maintenance schedule.
Warning!
Important!
Danger of fatal injury in the event of incorrect connection or incorrect use. 
 Ì Safety switches must not be bypassed (bridging of contacts), turned away, 
removed or otherwise rendered ineffective. On this topic pay attention in particular to the measures for reducing the pos­sibility of bypassing from EN 1088:1995+A2:2008, Section 5.7.
The device is only allowed to be installed and placed in operation by authorized  personnel 
 Ì who are familiar with the correct handling of safety components    Ì who are familiar with the applicable EMC regulations  Ì who are familiar with the applicable regulations on health and safety and ac-
cident prevention   
 Ì who have read and understood the operating instructions.
Prior to use,  read the  operating instructions  and  keep these  in  a safe  place.  Ensure that the operating instructions are always available during  mounting,  setup and servicing work. EUCHNER cannot provide any warranty in relation to  the readability of the CD  for the  storage period required. For this reason you  should archive a printed copy of the operating instructions. You can download  the operating instructions from www.EUCHNER.de.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Function
The device meets the following safety requirements:
 Ì Category 4, PLe according to EN ISO 13849-1  Ì Redundant design of the circuit in the unit with self-monitoring  Ì This means that the safety system still functions even if an internal component 
fails
 Ì The switch state of the semiconductor outputs is continuously monitored inter-
nally
 Ì Short circuit detection at the safety outputs by pulsed signals
The following switch-on condition applies  to safety outputs OA and OB (see also  System status table and the section Typical system times):
 Ì Safety guard closed  Ì Both safety outputs (IA and IB) must be on
The system consists of the following components: coded actuator (transponder)  and switch.
Each actuator has a unique electronic coding and is therefore a unique element.  The code in an actuator cannot be reprogrammed.
The actuator must be assigned to the safety switch by a teach-in process so that  it is detected by the system. This unambiguous assignment ensures a particularly  high level of protection against tampering.
The safety switch is fastened to the fixed part of the safety guard. 
The actuator attached to the movable part of the safety guard is moved towards  the read head fitted in the safety switch by closing the door. When the switch-on  distance is reached, power is supplied to the actuator by the read head by induc­tion and data can be transferred.
The bit pattern read is compared with the code saved in the safety switch. If the  data match, the safety outputs are enabled.
Due to the combination of dynamic polling of the actuator and  the  redundant,  diverse design of the safety electronics with the two feedback safety outputs, the  safety switch will enter the safe state with every detectable fault. 
When the safety guard is opened, the safety outputs switch off the safety circuit  and the monitoring output OUT is switched off. The state of the safety outputs is  monitored internally by two microprocessors. 
If faults are detected, the safety circuit is switched off and the DIA LED illuminates.  In case of devices with a DIA monitoring output, the output is switched on.
The safety switch has a redundant circuit design with self-monitoring. This means  that the safety system is still effective even if a component fails.
The system is designed so that failures will not result in the loss of the safety func­tion. The occurrence of failures is detected by cyclic self-monitoring at the latest  on the next demand to close the safety contacts (e.g. on starting). 
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Operating Instructions Safety Switches CES-AR-C.2-AH
If the safety door with the actuator should settle over time, the actuator can drift  out of the read head operating distance. The device recognizes this and indicates  that the actuator is in the boundary area (function available for V 1.1.2 and higher).  This allows the safety door to be readjusted in time.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Mounting
Caution!
Safety  switches  must  not  be  bypassed  (bridging  of  contacts),  turned  away,  removed or otherwise rendered ineffective.
 Ì On this topic pay attention in particular to the measures for reducing the pos-
sibility of bypassing according to EN 1088:1995.A2:2008, sec. 5.7.
Caution!
Risk of damage to equipment as a result of incorrect installation. Safety switches  must not be used as a mechanical end stop. 
 Ì Fit an additional end stop for the movable part of the safety guard.
Important!
 Ì From the assured switch-off distance S
down.
, the safety outputs are safely shut 
ar
 Ì When mounting several safety switches, observe the stipulated minimum 
distance to avoid mutual interference.
min. 120 mm
 Ì The operating distance changes during the mounting of the actuator as a 
function of the material used for the safety guard.
Note the following points:
 Ì Actuator and safety switch must be easily accessible for inspection and re-
placement.
 Ì The switching operation must only be triggered by the specific actuator desig-
nated for this purpose. For permissible combinations please see the Table Pos- sible combinations for CES components on page 4.
 Ì Actuator and safety switch must be fitted so that
 Ì the front faces are at the minimum switch-on distance 0.8 x S
when the safety guard is closed (see section Operating distances). A mini­mum distance dependent on the actuator must be maintained for a side ap­proach direction:    - For CES-A-BLN-R2    6 mm 
        - For CES-A-BLN-L2    6 mm 
        - For CES-A-BLN-U2    6 mm 
        - For CES-A-BDN-06    8 mm
 Ì when the safety guard is open up to the distance S
tance), a hazard is excluded.
 (assured switch-off dis-
ar
 or closer 
ao
 Ì the actuator is positively mounted on the safety guard, e.g. by using the 
safety screws included.
 Ì they cannot be removed or tampered with using simple means.  Ì Pay attention to the maximum tightening torque for the safety switch and 
actuator mountings of 1 Nm.
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Operating Instructions Safety Switches CES-AR-C.2-AH
Electrical connection
The following connection options are available:
 Ì Separate operation  Ì Series connection with Y-distributors from EUCHNER (only with M12 plug con-
nector)
 Ì Series connection, e. g. with wiring in the control cabinet  Ì Operation on an AR evaluation unit.
Warning!
In case of an error, loss of the safety function through incorrect connection.
 Ì To ensure safety, both safety outputs (OA and OB) must always be evaluated.  Ì The monitoring output OUT must not be used as a safety output.  Ì Lay the connection cables with protection to prevent the risk of short cir-
cuits.
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connection.
 Ì Do not use a control system with pulsing or switch off the pulsing function in 
your control system. The device generates its own pulse signal on the out­put lines OA/OB. A downstream control system must tolerate these pulses,  which may have a length of up to 1 ms.  The pulses are also output when the safety outputs are switched off.   Depending on the inertia of the connected device (control system, relay,  etc.), this can lead to short switching processes.
 Ì The inputs on an evaluation unit connected must be positive-switching, as the 
two outputs on the safety switch deliver a level of +24 V in the switched-on  state.
 Ì All the electrical connections must either be isolated from the mains supply by 
a safety transformer according to IEC 61558-2-6 with limited output voltage in  the event of a fault, or by other equivalent isolation measures (PELV).
 Ì For use and operation as per the   requirements, a power supply with the 
feature "for use in class 2 circuits" must be used. The same requirement ap­plies to the safety outputs. Alternative solutions must comply with the following requirements: a) Electrically isolated power supply unit with a max. open-circuit voltage of 30 
V/DC and a limited current of max. 8 A.
b) Electrically isolated power supply unit in combination with fuse as per UL248. 
This fuse should be designed for max. 3.3 A and should be integrated into  the 30 V/DC voltage section.
 Ì For use and applications as per the requirements of  , a connection cable 
listed under the UL category code CYJV2 must be used and the following  requirements met: The connection cables of EUCHNER meet these require­ments. The same requirement applies to the safety outputs.
 Ì All electrical outputs must have an adequate protective circuit for inductive 
loads. The outputs must be protected with a free-wheeling diode for this pur­pose. RC interference suppression units must not be used.
* Note on the scope of the UL approval: Only for applications as per NFPA 79 (Industrial Machinery) The devices are tested according to the requirements of UL508 (protection against electric shock and fire).
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Operating Instructions Safety Switches CES-AR-C.2-AH
Caution!
 Ì Power devices which are a powerful source of interference must be installed 
in a separate location away from the input and output circuits for signal pro­cessing. The cable routing for safety circuits should be as far away as pos­sible from the cables of the power circuits.
 Ì In order to avoid EMC interference, the physical environmental and operating 
conditions at the installation site of the device must comply with the require­ments according to the standard EN 60204-1:2006, section 4.4.2 (EMC).
 Ì Please pay attention to any interference fields in case of devices such as 
frequency converters or induction heating systems. Observe the EMC in­structions in the manuals from the respective manufacturer.
Important!
If the device does not appear to function when operating voltage is applied (e.g.  green STATE LED does not flash), the safety switch must be returned unopened  to the manufacturer.
Safety in case of faults
 Ì The operating voltage U
 is reverse polarity protected. 
B
 Ì The contacts OA/OB are short circuit-proof  Ì A short circuit between OA and OB is detected by the switch.   Ì A short circuit in the cable can be excluded by laying the cable with protection. 
Fuse protection for power supply
The power supply must be provided with fuse protection depending on the number  of switches and current required for the outputs. The following rules apply:
Max. current consumption of an individual switch I
I
   = IUB + I
max
   = Switch operating current (50 mA)
I
UB
   = Monitoring output load current (max. 50 mA)
I
OUT
 = Load current of safety outputs OA + OB (2 x max. 200 mA)
I
OA+OB
OUT
 + I
OA+OB
Max. current consumption of a switch chain Σ I
Σ I
max
 = I
 + n x (IUB + I
OA+OB
OUT
)
n  = Number of connected switches
max
max
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Operating Instructions Safety Switches CES-AR-C.2-AH
Requirements for connection cables
Caution!
Risk of damage to equipment or malfunctions as a result of incorrect connec­tion cables.
 Ì Use connection components and connection cables from EUCHNER  Ì On the usage of other connection components, the requirements in the fol-
lowing table apply. EUCHNER provides no warranty for safe function in case  of failure to comply with these requirements. 
Observe the following requirements with respect to the connection cables:
Parameter Value Unit
Conductor cross-section min. 0.34 mm² R max. 60 W/km C max. 120 nF/km L max. 0.65 mH/km Recommended cable type LIYY 8x or 5x 0.34 mm²
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Operating Instructions Safety Switches CES-AR-C.2-AH
Maximum cable lengths
Switch chains are permitted up to a maximum overall cable length of 200 m taking  into account the voltage drop as a result of the cable resistance (see table below  with example data and case example).
l
=200 m
max
l
SPS PLC
u
= 24 V -10%
min
l
1
l
n
i
out
2
un = 24 V -20%
5 x 0,34 mm
oder
5 x 0,14 mm
n
Max. number of
switches
5
6
10
2
2
5 x 0,34 mm
DIA STATE
2
DIA STATE
5 x 0,34 mm
CES-AR # n CES-AR # n-1 CES-AR # 1
l1 (m)
I
(mA)
out
Possible output current per channel
OA/OB
10 70 140 25 50 110
50 35 80 100 25 50 200 13 25
10 60 120
25 50 90
50 35 70 100 20 50 200 13 25
10 35 70
25 30 60
50 25 50 100 15 35 200 10 20
Max. cable length from the last switch
to the control system with conductor
cross-section
0.14 mm² 0.34 mm²
2
DIA STATE
Important!
The cables between the Y-distributors must have a conductor cross-section of 
0.34 mm².
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Operating Instructions Safety Switches CES-AR-C.2-AH
Determining cable lengths using the example table
Example: 6  switches are to be used in series. Cabling with a length of 40 m is  routed from a safety relay in the control cabinet to the last switch (#6) (conduc­tor cross-section 0.34 mm²). Cables with a length of 20 m each are connected  between the individual CES-AR safety switches. 
= 140 m
l
max
l
= 5 x 20 m
2
Sicherheits­relais
Safety Relay
l1 = 40 m
i
= min. 75 mA
out
l
= 20 m
n
un = min. 19,2 V
CES-AR # 6
DIA STATE
DIA STATE
CES-AR # 5 CES-AR # 4 CES-AR # 3
DIA STATE
DIA STATE
DIA STATE
CES-AR # 2 CES-AR # 1
DIA STATE
Fig. 1: Circuit example with six CES-AR
A safety relay is connected downstream which consumes 75 mA at each of the  two safety inputs. This operates over the whole temperature range with a voltage  of 19.2 V (corresponds to 24 V -20%).
All the relevant values can now be determined using the example table:
1.  Select the corresponding section in the column n (max. number of switches).  Here: 6 switches.
1.  In column I
 (possible output current per channel OA/OB), find a current 
out
greater than or equal to 75 mA. Here: 100 mA.
 ¨ It is then possible to determine the maximum cable length from the last switch 
(#6) to the control system from column l
. Here: a length of 50 m is permissible 
1
with a conductor cross-section of 0.34 mm². 
Result: The desired cable length l table. The overall length of the switch chain l
 of 40 m is below the permitted value from the 
1
 of 140 m is less than the maximum 
max
value of 200 m.
13
Operating Instructions Safety Switches CES-AR-C.2-AH
1
7
6
5
4
3
2
8
8 2 7 6 1 3 4 5
UB
0V
IA
IB
OA
OB
OUT
RST
Connector assignment of safety switch CES-AR
Coding lug
View on the connection side of the safety switch
Fig. 2: Connector assignment of safety switch CES-AR
Pin Designation Description Wire color
1 IB Enable input for channel 2 white 2 UB Power supply, DC 24 V  brown 3 OA Safety output, channel 1 green 4 OB Safety output, channel 2 yellow 5 OUT Door monitoring output gray 6 IA Enable input for channel 1 pink 7 0V Ground, DC 0 V blue 8 RST Reset input red
14
Operating Instructions Safety Switches CES-AR-C.2-AH
Connection of a single CES-AR-C
If a single CES-AR-C is used, connect the switch as shown in Figure 3. The OUT  output can also be connected here to a control system as a monitoring output.
The switch can be reset via the RST input. To do this, a voltage of 24 V is applied  to the RST input for at least 3 seconds. The RST input must be connected to 0 V  if it is not used.
Important!
The subsystem CES-AR complies with PL e in accordance with EN 13849-1. To  integrate the subsystem in a category 3 or 4 structure, it is necessary to monitor  the downstream load (the feedback loop must be monitored). These examples show only an excerpt that is relevant for connection of the CES  system. The example illustrated here does not show complete system planning.  The user is responsible for safe integration in the overall system.
DC 24 V
IB1
WH
UB2
BN
OA3
GN
OB4
YE
OUT5
GY
IA6
PK
0V7
BU
RST8
RD
-K1
Plug connector (8-pin)
CES-AR-C #1
GND
Fig. 3: Connection example for a single CES-AR-C
A1
A2
-K2
13
14
A1
13
A2
14
M
-M1
15
Operating Instructions Safety Switches CES-AR-C.2-AH
Warning!
In case of an error, loss of the safety function through incorrect connection.
 Ì To ensure safety, both safety outputs (OA and OB) must always be evaluated. 
Single-channel use of the safety outputs leads to a loss of the category in  accordance with EN ISO 13849-1.
DC 24 V
IB1
WH
UB2
BN
OA3
GN
OB4
YE
OUT5
GY
IA6
PK
0V7
BU
RST8
RD
-K1
Plug connector (8-pin)
CES-AR-C #1
GND
Fig. 4: Example of incorrect connection.
A1
A2
-K2
13
14
A1
A2
M M
-M1 -M2
13
14
16
Operating Instructions Safety Switches CES-AR-C.2-AH
Connection of several CES-AR-C in a switch chain
Important!
 Ì An AR switch chain may contain a maximum of 20 safety switches.  Ì In the estimation of the PL for the overall system, a maximum value of 100 
years can be assumed for the MTTF 13849-1:2008, section 4.5.2. This corresponds to a minimum value for the  PFHd of 2.47x10-8/h. 
 Ì When up to 11 devices are connected in series, these limit values can be 
assumed for the entire switch chain as a subsystem. As a subsystem, this  switch chain achieves PL e. 
 Ì In the case of series connection of more than 11 devices, the PFH
calculated according to one of the stated methods in EN ISO 13849-1:2008,  Section 4.5.1. 
 Ì If the simplified method according to Section 6.3 of EN ISO 13849:2008-12 
is used for validation, the Performance Level (PL) might be reduced when  more than 11 devices are connected in series.
The series connection is shown here based on the example of the version with plug  connectors M12. The switches are connected one behind the other with the aid  of pre-assembled connection cables and Y-distributors. If a safety door is opened  or if a fault occurs on one of the switches, the system shuts down the machine. A  higher level control system cannot, however, detect which safety door is open or  on which switch a fault has occurred with this connection technology. A special AR  evaluation unit is required for this purpose (see section Information on operation on an AR evaluation unit).
 according to the limit value in EN ISO 
d
 can be 
d
The series connection  can also be  realized via additional terminals in a control  cabinet.
The safety outputs are permanently assigned to the respective safety inputs of the  downstream switch. OA must be connected to IA and OB to IB. If the connections  are interchanged (e.g. OA to IB), the unit will switch to fault state
Always use input RST in series connections. All switches in a chain can be reset at  the same time with this reset input. To do this, a voltage of 24 V must be applied  to the RST input for at least 3 seconds. If input RST is not used in your application,  it should be connected to 0 V.
Note the following on this aspect:
 Ì A common signal must be used for all switches in the chain. This can be a 
changeover switch or the output of a control system. A button is not suitable  because Reset must always be connected to GND during operation (see switch  S11 in Figure 5).
 Ì Reset must always be performed simultaneously for all switches of the chain.
Information on operation on an AR evaluation unit
Devices with version number V 1.1.2 or higher can be operated on an AR evalua­tion unit. Please refer to the operating instructions for the relevant AR evaluation  unit for more information.
17
Operating Instructions Safety Switches CES-AR-C.2-AH
0V
24V
12
-S1
11 14
Eval Unit
OB
4
OA
3
Safety Outputs
OUT
5
0V
7
UB
2
RST
8
IA
6
IB
1
Safety Inputs
Read Head
Y-distributor
RST
5
RST
UB
1
135
UBOA0V
IA0VIB
OB
2
4
3
OB OA
OUT
Y-distributor Y-distributor
0V UB
RST IA IB
1 6 2 78 5 3 4
2
4
OB
Y-distributor
OA
OUT
0V
UB
RST
IA
IB
OB
OA
OUT
0V
UB
RST
IA
IB
4
3
Safety Outputs
5
7
2
8
6
1
Safety InputsSafety Inputs
4
3
Safety Outputs
5
7
2
8
6
1
Read Head
CES CES CES
Read Head
Terminating plug
2
4
1UB
Terminating plug
IA
IB
Fig. 5: Connection example for series connection with reset and changeover switch
18
Operating Instructions Safety Switches CES-AR-C.2-AH
Notes for operation with safe control systems
Important!
Devices with start button and feedback loop are not suitable for connection to  safe control systems.
Please observe the following requirements for connection to safe control systems:
 Ì Use a common power supply for the control system and the connected safety 
switches. 
 Ì A clocked power supply must not be used for UB. Tap the supply voltage 
directly from the power supply unit. If the supply voltage is connected to a  terminal of a safe control system, this output must provide sufficient electrical  current.
 Ì Always connect inputs IA and IB directly to a power supply unit or to outputs 
OA and OB of another EUCHNER AR device (series connection). Pulsed signals  must not be present at inputs IA and IB.
 Ì Outputs OA and OB can be connected to the safe inputs of a control system. 
Prerequisite: The input must be suitable for pulsed safety signals (OSSD sig­nals, e.g. from light curtains). The control system must tolerate pulses on the  input signals. This normally can be set up by parameter assignment in the  control system. Observe the notes of the control system manufacturer. For the  pulse duration of your safety switch, please refer to the section Typical system times on page 26.
A  detailed  example  of  connecting  and  setting the  parameters  of  the control  system is available for many  devices at www.euchner.de in the download area »  Applikationen » CES. The features of the respective device are dealt with there in  greater detail. 
19
Operating Instructions Safety Switches CES-AR-C.2-AH
24V
0V
M
3
DC24V
2
PWR
Supply of
the control
DI4 DI0DO..M DO..P DO
4/8 F-DI4 F-DO
Digital
Output
-X1 -X1
ET200
0V(UCM)
X2:1
J
X2:5
UCM
X2:4
LED1
X2:3
OB
4
OA
3
Safety Output
OUT
5
0V
7
UB
2
RST
8
IA
6
Safety Inputs
IB
1
OB
4
OA
3
Safety Output
OUT
5
0V
7
UB
Y-distributor Y-distributor
2
RST
8
IA
6
IB
Safety InputsSafety Inputs
1
CET
CES
Read Head
OB
4
OA
3
Safety Output
OUT
Y-distributor
Terminating plug
5
0V
7
UB
2
RST
8
IA
6
IB
1
CES
Read Head
Fig. 6: Connection example for mixed series connection (2 x CES and 1 x CET)
on ET200
20
Operating Instructions Safety Switches CES-AR-C.2-AH
Setup
LED indicators
LED Color State Significance
Important!
illumi­nated
STATE
DIA
green
red
flashing
illumi­nated
Teach-in function for actuator
The actuator must be allocated to the safety switch using a teach-in function before  the system forms a functional unit.
During a teach-in operation, the safety outputs and the monitoring output OUT are  in a high-resistance state, i.e. the system is in the safe state.
Normal operation
- Teach-in operation or Power Up 
- Actuator in boundary area (V. 1.1.2 or higher (further signal functions: see status table)
- Internal electronics fault
- Fault at the inputs/outputs
 Ì The safety switch disables the code of the previous actuator if teach-in is 
carried out for a new actuator. Teach-in is not possible again immediately for  this actuator if a new teach-in operation is carried out. The disabled code is  released again in the safety switch only after a third code has been taught.
 Ì The safety switch can only be operated with the last actuator taught.  Ì If the switch detects the actuator that was most recently taught when in 
teach-in standby state, this state is ended immediately and the switch chang­es to normal state.
 Ì The actuator being taught is not activated if it is within the operating dis-
tance for less than 60 s. 
Actuator teach-in
1.  Apply operating voltage to the safety switch.
 ¨ The green LED flashes quickly (approx. 10 Hz). 
A self-test is performed during this time (approx. 8 s). After this, the LED  flashes cyclically three times and signals that it is in standby state for teach­in.   Standby state for teach-in remains active for approx. 3 minutes.
2.  Move new actuator to the read head (observe distance < S
 ¨ Teach-in operation starts, green LED flashes (approx. 1 Hz). During teach-in, 
the safety switch checks whether the actuator is a disabled actuator. If this is  not the case, the teach-in operation is completed after approx. 60 seconds,  the green LED goes out. The new code has been saved, the old code disabled.
).
ao
3.  To activate the new actuator code from the teach-in operation in the safety  switch, the operating voltage to the safety switch must then be switched off  for min. 3 seconds. 
21
Operating Instructions Safety Switches CES-AR-C.2-AH
Teach-in function for series connection
It is recommended not to teach in the actuators in the series connection but to  teach them in one by one instead.  Teach-in in a series connection works analo­gously to individual operation in principle. All switches in the chain can be taught  in at the  same time. The  prerequisite is  that the switch  chain functions without  errors and the following
steps are complied with. Further steps might have to observed for mixed switch  chains (e.g. for chains with CES and safety switches with guard locking). Observe  the operating instructions for the other devices in the chain for this purpose.
Proceed as follows:
1.  Mount the switches and actuators and fully connect them (see e. g. Figure 5  or Figure 6)
2.  Close all safety doors in the chain.
3.  Switch on the power supply.
 ¨ The green LED STATE flashes at approx. 1 Hz on the safety switches and  the 
associated actuators are taught in. This happens for approx. 1 minute. Do not  switch off during this time and do not actuate reset! The teach-in operation has  ended when all LEDs on the safety switches are off.
4.  Actuate the reset for at least 3 s (24 V on RST)
 ¨ The system restarts and then functions in normal operation.
Replacing and teaching-in device
Work on the wiring (e.g. during device replacement) generally should be performed  in a de-energized state. On certain systems, it is nevertheless necessary to perform  this work and subsequent teach-in during ongoing operation.
Input RST must be connected as shown in Figure 5 to permit this.
Proceed as follows:
1.  Open the safety door on which the switch or actuator is to be replaced.
2.  Mount the new switch or actuator and fully connect them.
3.  Close all safety doors in the chain.
4.  Actuate the reset for at least 3 s (24 V on RST).
 ¨ On the safety switch that is positioned at a new actuator, the green LED flashes 
at approx. 1 Hz and the actuator is taught-in. This happens for approx. 1 min­ute - do not switch off during this time and do not actuate reset! The teach-in  operation has ended when all LEDs on the device are off.
5.  Actuate the reset for at least 3 s (24 V on RST).
 ¨ The system restarts and then continues to function in normal operation.
22
Operating Instructions Safety Switches CES-AR-C.2-AH
Functional check
After installation and any fault, the safety function must be fully checked. Proceed  as follows:
Warning!
Danger of fatal injury as a result of faults in installation and functional check.
 Ì Before carrying out the functional check, make sure that there are no per-
sons in the danger area.
 Ì Observe the valid accident prevention regulations.
1.  Switch on operating voltage.
 Ì The safety switch carries out a self-test.  
The green LED STATE flashes for 8 s with 10 Hz.  The STATE LED then flashes at regular intervals.
2.  Close all safety guards.
 Ì The machine must not start automatically.  Ì The green STATE LED illuminates continuously.
3.  Enable operation in the control system.
4.  Open the safety guard.
 Ì The machine must switch off and it must not be possible to start it as long as 
the safety guard is open.
 Ì The green LED STATE flashes at regular intervals.
Repeat steps 2-4 for each safety guard.
23
Operating Instructions Safety Switches CES-AR-C.2-AH
System status table
LED indicator
output
Operating mode
Self-test
Normal operation
Teach-in standby
Setup
Fault display
Actuator/
door position
Safety outputs
OA and OB
X off off
closed On On
closed On On
closed off On
open off off
open off off
open off off
closed off off
X off off
X off off
X off off
X off off
Monitoring output
OUT
STATE (green)
10 Hz 
(8 s)
flashes  quickly
2 Hz
1 x 
inverse
1 x Normal operation, door open
2 x Normal operation, door open, no actuator taught
3 x Door open, unit is ready for teach-in for another actuator (only short time after power-up)
1 Hz Teach-in operation
2 x
4 x Output fault (e. g. short circuits, loss of switching ability)
5 x Internal fault (e.g. component faulty, data error)
State
DIA (red)
Self-test after power up
Normal operation, door closed
Normal operation, door closed, actuator in the boundary area ¨ Re-adjust door (V. 1.1.2  or higher)
Normal operation, door closed, preceding device in the switch chain signals "door open"  (only with series connection)
Positive acknowledgment after completion of teach-in operation
Input fault (e. g. missing test pulses, illogical switch state from previous switch in the  switch chain)
Key to symbols
X off off X X Internal fault with door fault
LED not illuminated
LED illuminated
10 Hz (8 s)
3 x
X Any state
LED flashes for 8 seconds at 10 Hz
LED flashes three times, and this is then repeated
After the cause has been remedied, faults can generally be reset by opening and  closing the door. If the fault is still displayed afterward, use the reset function or  briefly interrupt the power supply. Please contact the manufacturer if the fault could  not be reset after restarting.
Important!
If you do not find the displayed device status in the System status table, this indi­cates an internal device fault. In this case, you should contact the manufacturer.
24
Operating Instructions Safety Switches CES-AR-C.2-AH
Technical data
Note!
If a product data sheet is included with the product, the information on the data  sheet applies in case of discrepancies with the operating instructions.
Technical data for safety switch CES-AR-CR2-AH/CES-AR-CL2-AH
Parameter Value Unit
min. typ. max. Housing material PBT V0 GF30 Dimensions 95 x 30 x 12 mm Weight 0.04 kg Ambient temperature at U
24 V Storage temperature - 40 - + 70 Degree of protection IP 69K
Safety class III Degree of contamination 3 Installation position Any Connection Plug connector or connection cable Operating voltage U
ity protected, regulated, residual  ripple < 5%)
For the approval according to  the following applies
Current consumption 50 mA Switching load according to  External fuse (operating voltage) 0.25 - 1.5 A Safety outputs OA/OB Semiconductor outputs, p-switching, short circuit-proof
- Output voltage U(OA)/U(OB) 
  HIGH
  HIGH
  LOW
Switching current per safety output 1 - 200 mA Utilization category according to 
EN IEC 60947-5-2
Off-state current I Monitoring output OUT 
- Output voltage 0.8 x U
- Max. load - - 50 mA Rated insulation voltage U Rated impulse withstand voltage 
U
imp
Resilience to vibration Switching frequency - - 1 Hz Repeat accuracy R ≤ 10 % EMC protection requirements In acc. with EN IEC 60947-5-3
Reliability values according to EN ISO 13849-1
Category 4 Performance Level PL e PFH
d
Mission time 20 years
1)  Values at a switching current of 50 mA without taking into account the cable lengths.
2)  Applying the limit value from EN ISO 13849-1:2008, Section 4.5.2 (MTTF
-8
x 10
.
 = DC 
B
- 30 - + 65
(IP 67 for version with M12 plug connector)
 (reverse polar-
B
Operation only with UL Class 2 power supply, or equivalent 
24 ± 15% (PELV) V DC
measures
DC 24 V, class 2
1)
U(OA)
U(OB)
-1.5 - U
U
B
U(OA)/U(OB) 0 1
DC-13  24 V  200 mA 
Caution: outputs must be protected with a free-wheeling diode in 
case of inductive loads.
r
1)
i
p-switching, short circuit-proof
B
- - 75 V
≤ 0.25 mA
- U
- - 1.5 kV
As per EN IEC 60947-5-2
1.9 x 10
 = max. 100 years), BG certifies a PFHd of max. 2.47 
d
°C
B
B
 -9
2)
 / h 
V DC
V DC
25
Operating Instructions Safety Switches CES-AR-C.2-AH
Typical system times
The  specified  times  are maximum values for AR switch chains with 20 devices.  Individual devices have shorter system times.
Ready delay: After switching on, the unit carries out a self-test for 8 s. The system  is ready for operation only after this time.
Switch-on time of safety outputs: The max. reaction time from the moment when  the actuator is at the operating distance (safety door closed) to the moment when  the safety outputs switch on T
Simultaneity monitoring, safety inputs IA/IB: If the safety inputs have differ­ent switching states  for longer than  150 ms, the  safety outputs OA/OB will be  switched off.
Risk time according to EN 60947-5-3: If an actuator moves outside the op­erating distance, the safety outputs OA and OB are deactivated after a maximum  of 360 ms.
Difference time: The safety outputs OA and OB switch with a slight time offset.  They have the same signal state at the latest after a difference time of 10 ms.
Pulses on the safety outputs: The device generates its own pulse signal on the  output lines OA/OB.  A downstream control system must tolerate  these pulses,  which may have a length of up to 1 ms. 
 is 300 ms (400 ms for switch chains).
on
This can usually  be  set up in  the  control systems by  parameter assignment. If  parameter assignment is not possible for your control system or if shor ter pulses  are required, please contact our support organization.
The pulses are also output when the safety outputs are switched off.
26
Operating Instructions Safety Switches CES-AR-C.2-AH
30
Dimension drawings and connector assignments
Connection cable  
with M12 plug connector
Length of cable piece:
1,000 mm or 2,000 mm
Safety switch CES-AR-CL2-AH...
23
4,4
connection cable
Active face
95
+0,5
85
With  
LEDs
3
4,25
12
M8x1
Safety switch CES-AR-CR2-AH...
Active face
6
3
4,25
LEDs
11
19,5
5,5
12
6
Active face
DIA
75,5
95
+0,5
85
STATE
With  
connection cable
with M12 plug connector
23
Connection cable  
Fastening lug  
with reinforcement plate
4,4
30
Fastening lug with rein-
forcement plate
DIA
STATE
Active face
75,5
11
19,5
5,5
M8x1
Length of cable piece:
1,000 mm or 2,000 mm
27
Operating Instructions Safety Switches CES-AR-C.2-AH
4
85
3
12
Connector assignment
Y-distributor (8-pin, socket)
Safety switch CES-AR
(8-pin plug)
and
Pin Function
1 IB
2 U
3 OA
4 OB
5 OUT
6 IA
7 0 V
8 RST
B
Bridging plug 097645
4-pin , plug
Y-distributor  
with connection cable
Y-distributor 
097627
111696 or 112395
15,1
M x1
12
Socket
6
7
( )
45°
097627
M x1
12
Ø 14,6
2
2
1
Pin Function
3 5
4
1 U
2 IA
3 0 V
4 IB
5 RST
B
3
5
4
1
20,5
35,1
B
Socket
485
3
max. 45
2
1
M12x1
15 15
41
M12x1
Ø 14,5
6
7
M12x1
45
Order No.
Length
l [mm]
111696 200
Length l
33
A
B
112395 1000
44
Plug Socket
M12x1
15
2
Plug Socket
3
5
4
Pin Function
1 U
2 OA
3 0 V
4 OB
5 RST
2
3
5
4
1
1
Pin Function
1 U
Pin Function
B
1 U
B
2 IA
3 0 V
2 OA
3 0 V
4 OB
5 RST
4 IB
5 RST
28
Operating Instructions Safety Switches CES-AR-C.2-AH
19,5
12
Technical data for actuator CES-A-BLN-...
Parameter Value Unit
min. typ. max.
Housing material Plastic PBT Dimensions
Fastening lug  
with reinforcement plate
- CES-A-BLN-R2/CES-A-BLN-L2
- CES-A-BLN-U2
Weight
- CES-A-BLN-R2/CES-A-BLN-L2
- CES-A-BLN-U2
Ambient temperature - 40 - + 70 °C
Degree of protection acc. to EN  IEC 60529
Installation position Active face opposite read head
Power supply Inductive via read head
Dimension drawing
CES-A-BLN-R2 CES-A-BLN-U2
75,5
Active face
Active face
95 x 30 x 12 55 x 30 x 12
0.04
0.02
IP 69K
4,25
mm
kg
4,4
11
19,5
+0,5
4,25
3
12
85 95
30
4,4
11
35
45
3,5
55
Active face
30
Fastening lug  
with reinforcement plate
Active  face
CES-A-BLN-L2
30
4,4
75,5
Active face
+0,5
85
95
Active face
Fastening lug  
with reinforcement plate
11
19,5
4,25
3
12
29
Operating Instructions Safety Switches CES-AR-C.2-AH
Switching distances
Operating distance for center offset m = 0
(only in combination with actuator CES-A-BLN-...)
Parameter Value Unit
min. typ. max.
Switch-on distance - 15 -
Assured switch-on distance s
Switching hysteresis 
Assured switch-off distance s
- in x/z direction
1)
ao 
1)
ar
- in x direction
Typical operating distance
(only in combination with actuator CES-A-BLN-...)
10 - -
1 2 -
-
-
-30
-25
5
10
15
20
X
-
-
Y 40
35
30
25
20
15
10
-10
5
-5
5
10
-5
-10
-15
-20
-25
-30
-35
-40
mm
40 60
-20
-15
15
20
25
30
Z
For a side approach direction for the actuator and safety switch, a minimum distance of s = 6 mm 
must be maintained so that the operating distance of the side lobes is not entered.
Fig. 7: Typical operating distance
30
Operating Instructions Safety Switches CES-AR-C.2-AH
Technical data for actuator CES-A-BDN-06
Parameter Value Unit
min. typ. max.
Housing material Macromelt PA-based plastic Dimensions 26 x ∅ 6 mm
Weight 0.005 kg
Ambient temperature - 40 - + 70 °C
Degree of protection acc. to EN  IEC 60529
Installation position Active face opposite read head
Power supply Inductive via read head
1) With flush installation
IP 67 / IP 69K 
1)
Caution!
Dimension drawing
Operating distance
* min. 30 Ø
+
0,1
6,1
0
+
0,5
26
30
*
0
* metal-free zone
Do not mount at temperatures below 0 °C. The actuator can be damaged during mounting.
30
*
Installation options
6
x
y
z
Switching distances
Operating distance for center offset m = 0
(only in combination with actuator CES-A-BDN-...)
Parameter Value Unit
min. typ. max.
Switch-on distance - 19 -
Assured switch-on distance s
Switching hysteresis 
1)
Assured switch-off distance s
- in x/z direction
- in y direction
31
1)
ao 
ar
14 - -
- 2 -
-
-
-
-
40 60
mm
Operating Instructions Safety Switches CES-AR-C.2-AH
Ordering information and accessories
Designation Version Order
CES-AR-CR2-AH-SG-105751 unicode, door hinge right, plug connector M8, 8-pin 105751 CES-AR-CL2-AH-SG-105753 unicode, door hinge left, plug connector M8, 8-pin 105753 CES-AR-CR2-AH-SA-105746 unicode, door hinge right, connection cable PUR, length 1 m, 
CES-AR-CL2-AH-SA-105748 unicode, door hinge left, connection cable PUR, length 1 m, 
CES-AR-CR2-AH-L05-109046 unicode, door hinge right, connection cable PUR, length 5 m 109046 CES-AR-CL2-AH-L05-109047 unicode, door hinge left, connection cable PUR, length 5 m 109047 CES-AR-CR2-AH-L10-109050 unicode, door hinge right, connection cable PUR, length 10 m 109050 CES-AR-CL2-AH-L10-109051 unicode, door hinge left, connection cable PUR, length 10 m 109051 CES-AR-CR2-AH-L20-109054 unicode, door hinge right, connection cable PUR, length 20 m 109054 CES-AR-CL2-AH-L20-109055 unicode, door hinge left, connection cable PUR, length 20 m 109055 Bridging plug M12, 4-pin, plug 097645 Y-distributor M12, 1x8-pin, 2x5-pin 097627 Y-distributor with connection cable M12, 1x8-pin, 2x5-pin 111696 Connection cable M12, 8-pin, PVC, 
open cable end, conductor cross­section 0.25 mm² 
Connection cable M8, 8-pin, PUR,  open cable end, conductor cross­section 0.14 mm² 
Connection cable M8, 8-pin, PVC,  open cable end, conductor cross­section 0.14 mm²
Actuator CES-A-BLN-R2 95 mm x 30 mm x 12 mm, door hinge right 100776
Actuator CES-A-BLN-L2 95 mm x 30 mm x 12 mm, door hinge left 104510
Actuator CES-A-BLN-U2 55 mm x 30 mm x 12 mm 103450
Actuator CES-A-BDN-06 26 mm x ∅ 6 mm 104730
with plug connector M12, 8-pin
with plug connector M12, 8-pin
M12, 8-pin, 5 m 100177
M12, 8-pin, 10 m 100178
M12, 8-pin, 20 m 100179
M8, 8-pin, 5 m 106671
M8, 8-pin, 10 m 106672
M8, 8-pin, 20 m 106673
M8, 8-pin, 5 m 110933
M8, 8-pin, 10 m 110934
M8, 8-pin, 15 m 110935
M8, 8-pin, 20 m 111603
No.
105746
105748
Tip!
You will find further connection material, in particular for series connection, in the  current Non-Contact Safety System CES catalog at www.euchner.de.
32
Operating Instructions Safety Switches CES-AR-C.2-AH
Inspection and service
Warning!
Loss of the safety function because of damage to the system. In case of damage, the related component must be replaced completely.  Only accessories  or spare parts that can be ordered from EUCHNER may be  replaced.
Regular inspection of the following is necessary to ensure trouble-free long-term  operation:
 Ì Check the switching function (see section Functional check)  Ì Check the secure fastening of the devices and the connections  Ì Check for soiling
No servicing is required, repairs to the device are only allowed to be made by the  manufacturer.
Note!
The year of manufacture can be seen in the lower right corner of the rating plate.  The current version number in the format (V X.X.X) can also be found on the device.
Service
The safety door must be re-adjusted when the device indicates that the actuator  is in the boundary area.
If service support is required, please contact:
EUCHNER GmbH + Co. KG
Kohlhammerstraße 16
D-70771 Leinfelden-Echterdingen
Service telephone:
+49 711 7597-500
E-mail:
info@euchner.de
Internet:
www.euchner.de
33
Operating Instructions Safety Switches CES-AR-C.2-AH
Declaration of conformity
34
Operating Instructions Safety Switches CES-AR-C.2-AH
35
More than safety.
Euchner GmbH + Co. KG Kohlhammerstraße 16 D-70771 Leinfelden-Echterdingen
info@euchner.de www.euchner.de
Edition: 109309-05-05/13 Title:  Operating Instructions Safety Switches CES-AR-C.2-AH (translation of the original operating instructions) Copyright: © EUCHNER GmbH + Co. KG, 05/2013
Subject to technical modifications,  no responsibility is accepted for the accuracy of this informa­tion.
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