Safety engineering
Device modules
Safety module SM100
1
14
EDS94AYAB EN 2.1
1.2.4 Safety module SM100
1.2.4.1 Overview
The type designation of the safety module is E94AYAB.
Function
ƒ Safe torque off
(up to now: Safe standstill, protection against unexpected start−up)
Danger!
If the request for the safety function is cancelled, the drive will restart
automatically.
You must provide external measures which ensure that the drive only restarts
after a confirmation (EN 60204).
SM 100
SIA
SIB
GI
24O
DO1
GO
PWM
µC
-
~
-
-
SSP94S1010
Fig. 1−2 Function overview SM100
SM100 Safety module
SIA, SIB, GI Two−channel sensor signal connections, supply through safely separated power
supply unit (SELV/PELV)
(old labelling up to HW version VB: SI1, SI2, GI)
24O, DO1, GO Non−safe feedback connections, supply through safely separated power supply
unit (SELV/PELV)
mC Microcontroller
PWM Pulse width modulation
1.2.4.2 Safety category
The functions of the SM100 safety module for the Servo Drives 9400 controllers meet the
requirements of the following standards:
ƒ Category 4 and Performance Level e (PL e) according to ISO 13849−1 (formerly
EN 954−1)
– In order to comply with category 4/PL e, the external wiring and cable monitoring
must also meet the requirements of category 4/PL e.
– Ensure that short circuits cannot occur in the external wiring.
ƒ SIL 3 according to IEC 61508
– The SM100 safety module does not contribute to the probability of failure on
demand (PFD) and probability of failure per hour (PFH) of IEC 61508.
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