Technical data
Power supply
24 Vdc ±10%, 2 W, Class 2
24 Vac -15/+10% 50-60 Hz, 4.5 VA, Class 2
Overvoltage category III
Short circuit protection internal PTC
Rated insulation voltage 4 kV
Input current
Typical 5mA
Output type
Voltage free contact output, relays with forcibly
guided contacts
Max current rating -
single output
@ 60°C (140°F) operating temperature:
AC 1: 250V / 6A / 2000 VA - AC 15: 230V / 3A
DC 1: 24V / 6A - DC 13: 24V / 2.5A / 0.1 Hz
Pilot duty: B300 / R300
Max. total current
Σ
Ith²
Spacing between modules ≥100mm: 72A² @40°C
(104°F) ambient temperature
Modules mounted stacked: 26A² @25°C (77°F)
ambient temperature
Please refer to the derating curves in chapter 12**
Protection grade
IP40 on frontal part of the housing, IP20 on the
terminals. The device has to been installed in a
cabinet with protection degree of IP54.
Operating temperature
-25 ÷ +60°C (-13 ÷ 140°F), UL: +40°C (104°F)
Storage temperature
-30 ÷ +70°C (-22 ÷ 158°F)
LED information
LED
Color
Status
Meaning
Power
Green
ON
SM is powered
Input 1
Input 2
Yellow
Input 1 OFF
Input 2 OFF
The safety devices connected to the inputs 1 and
2 are not active (e.g. contacts open); the safety
module cannot enable the safety outputs
Input 1 ON
Input 2 OFF
The safety device connected to the input 1 is
active (e.g. contact closed), while the input 2 is
not active (e.g. contact open); the safety module
cannot enable the safety outputs
Input 1 OFF
Input 2 ON
The safety device connected to the input 2 is
active (e.g. contact closed), while the input 1 is
not active (e.g. contact open); the safety module
cannot enable the safety outputs
Input 1 ON
Input 2 ON
The safety devices connected to the inputs 1 and
2 are active (e.g. contacts closed); the safety
module can enable the safety outputs
Channels
Green
OFF
The NO safety outputs are open and the NC auxi-
liary output is closed
ON
The NO safety outputs are closed and the NC
auxiliary output is open
Wiring information
Max. terminal tightening torque: 0.5Nm (for all connections)
To prevent contact welding, a fuse should be connected on the output contacts.
Sufficient fuse protection must be provided on all output contacts with capacitive and inductive
loads. Ensure the wiring and EMC requirements of IEC 60204-1 are met.
It is good practice to separate the power supply of the control unit from that of other electrical
devices (e.g. frequency drives, electric motors, inverters) or other sources of disturbance.
Use conductors with section: 0,2 - 2,5 mm² (24 - 14 AWG)
EN
Safety parameters
SMS20
SMS31
SMSA31
SM2H21
SME41
ISO 13849-1
Safety Category
Cat. 4
Cat. 4
Cat. 4
Cat. 4***
ISO 13849-1
Performance Level
PL e
PL e
PL e
PL e***
DIN EN 81-20
Certified
DIN EN 81-50
Certified
MTTF
D
[a]
420,8
420,8
422,1
363,4
PFH
D
[1/h]
1,85 E-10
1,85 E-10
1,35 E-10
1,59 E-10
DCavg
99%
99%
99%
99%***
ß
5,00 E-02
5,00 E-02
5,00 E-02
5,00 E-02
ß
D
2,00 E-02
2,00 E-02
2,00 E-02
2,00 E-02
***The SME41 is an expansion module with no internal diagnostics. To attain Cat 4, PL e
according to EN ISO 13849-1, the SME41 must be used with a Cat 4, PL e master module
and the NC feedback output of SME41 (contacts 51-52) must be connected in series with
the start signal of the master module (as shown in sections 10.2.2 and 10.2.3)**. This
must be done to prevent any start/restart of the system if an internal failure in the SME41
has occurred.