Notes Switch travel diagram
  Contact closed
  Contact open
  Setting range
  Break point
  Positive opening sequence/- angle
VS  adjustable range of NO contact
  adjustable range of NC contact
N   after travel
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Solenoid interlock  ->  MZM 120  ->  MZM 120 BM ST2-SD2PRE-A
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• Guard locking monitored
• Thermoplastic enclosure
• Safety switches must be used as end stop
• 40 mm x 179 mm x 40 mm
• Electronic contact-free, coded system
• Variably adjustable latching
• 3 LEDs to show operating conditions
• Sensor technology permits an offset between actuator and interlock of ± 5 mm vertically and ± 3 mm horizontally
• Intelligent diagnosis
• Self-monitoring series-wiring of 31 sensors
• connector plug M12, 8-pole
• Power to lock
• serial diagnostic output
• enabling signal, when safety guard closed and locked (without force monitoring)

Ordering details
Product type descriptionMZM 120 BM ST2-SD2PRE-A
Article number101215717
EAN Code4030661419343
Approval USA/CAN
StandardsEN ISO 13849-1, IEC 61508, IEC 60947-5-3
PLup e
Control categoryup 4
PFH4.3 x 10-9/h
SILup 3
Mission time20 Years
Global Properties
Permanent lightMZM 120
StandardsIEC 61508, IEC 60947-5-3, EN ISO 13849-1
Compliance with the Directives (Y/N) Yes
Suitable for safety functions (Y/N)Yes
Series-wiringup to 31 components
Length of the sensor chainmax. 200 m
− without detriment to the category to EN ISO 13849-1
Active principleinductive
Duty cycle ED100 %
- Material of the housingsPlastic, glass-fibre reinforced thermoplastic
Housing coatingNone
Guard locking monitored (Y/N)Yes
Actuator monitored (Y/N)Yes
Idle assignable pushbutton and LED (Y/N)No
Reaction time< 150
Duration of risk< 150
Time to readiness< 4000
Recommended actuatorMZM 120-B1.1
Mechanical data
Design of electrical connectionconnector plug M12, 8-pole
Mechanical life≥ 1.000.000 operations
notice - Mechanical lifeoperations for guards ≥ 5 kg;
actuating speed
≥ 0,5 m/s
noticeThe latching force can be set in steps within a range of approx. 30 N (factory setting) to approx. 80 N. To this end, the adjustment target MZM 120 TARGET is used.
restistance to shock30 g / 11 ms
Resistance to vibration10 … 150 HZ, Amplitude 0,35 mm
Emergency unlocking device (Y/N)No
Manual release (Y/N)No
Emergency release (Y/N)No
Latching (Y/N)Yes
electrically adjustable latching force30 … 80
Clamping force F500 N
Ambient conditions
Ambient temperature
- Min. environmental temperature−25
- Max. environmental temperature+55
Storage and transport temperature
- Min. Storage and transport temperature−25
- Max. Storage and transport temperature+85
Relative humidity30… 95
- non-condensing
- non-icing
Protection classIP67, IP69K
Protection ratingII,
Air clearances and creepage distances To IEC/EN 60664-1
- Rated impulse withstand voltage Uimp0,8 kV
- Overvoltage categoryIII
- Degree of pollution3
Electrical data
Number of auxiliary contacts0
Number of safety contacts2
Cross circuit/short circuit recognition possible (Y/N)Yes
Power to unlockNo
Power to lockYes
Supply voltage UB (stabilised PELV)24 VDC −15% / +10%
Switch frequency1
Rated insulation voltage Ui32 VDC
Operating current Ie1 A
Utilisation categoryDC-12, DC-13
No-load current I0max. 0,6 A
Device insulation≤ 2 A
- to UL 508; depending on the number of devices and loads (Y1, Y2 and OUT)
noticeCable length and cable section alter the voltage drop depending on the output current
Electrical data - Safety inputs
Safety inputsX1 and X2
Rated operating voltage Ue−3 V … 5 V ( Low)
15 V … 30 V ( High)
Operating current Ie> 2 mA / 24 V
Electrical data - Safety outputs
Safety outputsY1 and Y2
Fuse ratingshort-circuit proof, p-type
Rated operating voltage0 V … 4 V under Supply voltage UB
Residual current Ir≤ 0,5 mA
Operating current Ie0,25 A
Utilisation categoryDC-12, DC-13
Electrical data - Diagnostic output
Serial diagnostics (Y/N)Yes
Wiring capacitance for serial diagnostics50
diagnostic signalsguard door closed and interlocking device locked
Operating principle of the diagnostic outputThe short-circuit proof diagnostic output OUT can be used for central visualisation or control tasks, e.g. in a PLC.
noticeThe diagnostic output is not a safety-relevant output!
Electrical data - Solenoid control IN
Control commandInterlocking the solenoid interlock
LED switching conditions display
LED switching conditions display (Y/N)Yes
LED switching conditions display
- Supply voltage UB availablegreen LED
- switching conditionyellow LED
- Error functional defectred LED
Explosion protection categories for gasesNone
Explosion protected category for dustsNone
Dimensions of the sensor
- Width of sensor40
- Height of sensor177.5
- Length of sensor40
Pin assignment
1A1 Supply voltage UB
2X1 Safety input 1
4Y1 Safety output 1
5OUT serial diagnostic output
6X2 Safety input 2
7Y2 Safety output 2
8IN serial diagnostic input
9without function
As long as the safety guard remains closed, the unlocked safety guard can be relocked. In this case, the safety outputs are re-enabled, so that the safety guard must not be opened.
Included in delivery
Actuators must be ordered separately.

K.A. Schmersal GmbH & Co. KG, Möddinghofe 30, D-42279 Wuppertal
The data and values have been checked throroughly. Technical modifications and errors excepted.
Generiert am 17.09.2019 - 16:26:30h Kasbase 3.3.0.F.64I