EUCHNER – More than safety.
EUCHNER – More than safety.

CKS2-K-BP-CC-FLX-F00-USI-168631 (Order no. 168631)

Key adapter CKS2-K-BP with FlexFunction

  • Key adapter with integrated evaluation electronics
  • Suitable for separate operation (no series connection)
  • 2 safety outputs (semiconductor outputs)
  • Short circuit monitoring
  • Category 4/PL e according to EN ISO 13849-1
  • LED indicator, multicolor RGB
  • M12 plug connector, 5-pin, with connecting cable 15 cm
  • Direct connection to IP67 field modules
  • Pushbutton for teach-in operation
  • Mechanical detent mechanism for inserted key
CKS2-K-BP-CC-FLX-F00-USI-168631 (Order no. 168631)


Category according to EN 13849-1

Due to two redundantly designed semiconductor outputs (safety outputs) with internal monitoring suitable for:

  • Category 4/PL e according to EN 13849-1

Important: To achieve the stated category according to EN ISO 13849-1, both safety outputs (FO1A and FO1B) must be evaluated.

Key evaluation

A teach-in operation to configure the device is required when setting up EUCHNER FlexFunction products. The device function depends on the type of key taught-in.

Important:Keys must be ordered separately!

Terminal assignment

1UBPower supply, DC 24 V
2FO1ASafety output, channel A
30VGround, DC 0 V
4FO1BSafety output, channel B
Dimension drawing
Dimension drawing

Dimension drawings

Dimension drawings

Connection examples

Connection examples

Technical data



Electrical connection ratings

Current consumption 40 mA
external (operating voltage UB) 0.25 ... 8 A
rated conditional short-circuit current 100 A
Rated insulation voltage Ui 300 V
Rated impulse withstand voltage Uimp 1.5 kV
Operating voltage DC
UB 24 V DC -15% ... +20% reverse polarity protected, regulated, residual ripple < 5%, PELV
Turn-on time
Safety outputs max. 100 ms
EMC protection requirements according to EN IEC 60947-5-3
Utilization category
DC-13 24 V 150 mA (Caution: outputs must be protected with a free-wheeling diode in case of inductive loads.)
Off-state current Ir max. 0.25 mA
Risk time according to EN 60947-5-3
Single device max. 125 ms
Safety class III
Degree of contamination (external, according to EN 60947-1) 2
Safety outputs FO1A/FO1B
Output type Semiconductor outputs, p-switching, short circuit-proof
Discrepancy time max. 10 ms
Output voltage
HIGH U(FO1A) / U(FO1B) UB-4V ... UB V DC
LOW U(FO1A) / U(FO1B) 0 ... 1 V DC
Switching current
per safety output 1 ... 150 mA
Test pulses 0.3 ms
Test pulse interval 97 ... 105 ms

Mechanical values and environment

Degree of protection
in mounted condition (only access side) IP65/IP67 (on installation in flat metal plate, thickness = 2 mm)
Ready delay 2 s
Housing Plastic PA6-GF30 black
Connecting cable PUR
Installation orientation on the front
Storage temperature -25 ... +70 °C
Mounting cut-out according to DIN IEC 61554 33x68 mm
Shock and vibration resistance according to EN IEC 60947-5-3
Ambient temperature
at UB = 24V DC -25 ... -55 °C
Connection X1
Connection Connector cable with plug connector M12
Static bending radius 5x cable diameter
Cable outlet straight
Cable length 0.15 m
Number of pins 5

Reliability values acc. to EN ISO 13849-1

Safe key detection
Mission time 20 y
Category 4
Performance Level PL e
PFHD 6 x 10-10
acc. EN 62061:2005/A2:2015 3



Complete package

Download all important documents with a single click.


  • The operating instructions and any additions to the operating instructions or brief instructions
  • Any data sheets to supplement the operating instructions
  • The declaration of conformity
Download Complete Package (ZIP, 2,8 MB)

Single Documents

Other Documents

Ordering data

Ordernumber 168631
Item designation CKS2-K-BP-CC-FLX-F00-USI-168631
Gross weight 0,19kg
Customs tariff number 85389099

Technical support

Technical support
Do you have technical questions about our products, their possible use or applications? Our experts will be happy to help.

+1 315 701-0315