schmersal SRB 324ST V.3 User manual

SRB 324ST V.3
Operating instructions
Safety-monitoring module
EN 1
1. About this document
1.1 Function
This operating instructions manual provides all the information you
need for the mounting, set-up and commissioning to ensure the safe
operation and disassembly of the safety-monitoring module. The
operating instructions must be available in a legible condition and a
complete version in the vicinity of the device.
1.2 Target group: authorised qualified personnel
All operations described in this operating instructions manual must
be carried out by trained specialist personnel, authorised by the plant
operator only.
Please make sure that you have read and understood these operating
instructions and that you know all applicable legislations regarding
occupational safety and accident prevention prior to installation and
putting the component into operation.
The machine builder must carefully select the harmonised standards
to be complied with as well as other technical specifications for the
selection, mounting and integration of the components.
1.3 Explanation of the symbols used
Information, hint, note:
This symbol is used for identifying useful additional
information.
Caution: Failure to comply with this warning notice could
lead to failures or malfunctions.
Warning: Failure to comply with this warning notice could
lead to physical injury and/or damage to the machine.
1.4 Appropriate use
The products described in these operating instructions are developed to
execute safety-related functions as part of an entire plant or machine. It
is the responsibility of the manufacturer of a machine or plant to ensure
the correct functionality of the entire machine or plant.
The safety-monitoring module must be exclusively used in accordance
with the versions listed below or for the applications authorised by the
manufacturer. Detailed information regarding the range of applications
can be found in the chapter "Product description".
1.5 General safety instructions
The user must observe the safety instructions in this operating
instructions manual, the country specific installation standards as well
as all prevailing safety regulations and accident prevention rules.
Further technical information can be found in the Schmersal
catalogues or in the online catalogue on the Internet:
www.schmersal.net.
The information contained in this operating instructions manual is
provided without liability and is subject to technical modifications.
There are no residual risks, provided that the safety instructions as well
as the instructions regarding mounting, commissioning, operation and
maintenance are observed.
Content
1 About this document
1.1 Function ..............................................1
1.2 Target group: authorised qualied personnel..................1
1.3 Explanation of the symbols used ...........................1
1.4 Appropriate use ........................................1
1.5 General safety instructions ...............................1
1.6 Warning about misuse ...................................2
1.7 Exclusion of liability .....................................2
2 Product description
2.1 Ordering code .........................................2
2.2 Special versions........................................2
2.3 Purpose ..............................................2
2.4 Technical data .........................................2
2.5 Classication ..........................................3
3 Mounting
3.1 General mounting instructions .............................3
3.2 Dimensions ...........................................3
4 Electrical connection
4.1 General information for electrical connection..................3
5 Operating principle and settings
5.1 LED functions..........................................3
5.2 Description of the terminals ...............................4
5.3 Notes ................................................5
5.4 Setting report SRB 324ST V.3 .............................5
6 Set-up and maintenance
6.1 Functional testing.......................................5
6.2 Maintenance ..........................................5
7 Disassembly and disposal
7.1 Disassembly...........................................5
7.2 Disposal ..............................................5
8 Appendix
8.1 Wiring examples .......................................5
8.2 Start conguration ......................................6
8.3 Sensor conguration ....................................6
8.4 Actuator conguration ...................................7
9 EU Declaration of conformity
x.000 / 07.2019 / v.A. - 101194424-EN / G / 2019-03-29 / AE-Nr. 10763
EN Operating instructions. . . . . . . . . . . . .pages 1 to 8
Original

2
Operating instructions
Safety-monitoring module SRB 324ST V.3
EN
1.6 Warning about misuse
In case of inadequate or improper use or manipulations of
the safety-monitoring module, personal hazards or damage
to machinery or plant components cannot be excluded.
The relevant requirements of the standards ISO 14119 and
ISO 13850 must be observed.
1.7 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from
defective mounting or failure to comply with this operating instructions
manual. The manufacturer shall accept no liability for damages
resulting from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary
repairs, conversions and modifications to the device are strictly
forbidden; the manufacturer shall accept no liability for damages
resulting from such invasive work, arbitrary repairs, conversions and/or
modifications to the device.
The safety-monitoring module must only be used when the enclosure is
closed, i.e. with the front cover fitted.
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
SRB 324ST V.3
Only if the information described in this operating instructions
manual are realised correctly, the safety function and
therefore the compliance with the Machinery Directive is
maintained.
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Purpose
The safety-monitoring modules for integration in safety circuits are
designed for fitting in control cabinets. They are used for the safe
evaluation of the signals of positive break position switches for safety
functions or magnetic safety sensors on sliding, hinged and removable
safety guards as well as emergency stop control devices and AOPDs
(safety light barriers).
The safety function is defined as the opening of the enabling
circuits13-14, 23-24 and 33-34 and the delayed opening of the enabling
circuits 47-48 and 57-58 when the inputs S11-S12 and/or S21-S22 are
opened. The safety-relevant current paths with the outputs contacts
13-14, 23-24 and 33-34 meet the following requirements under
observation of a PFH value assessment (also refer to chapter 2.5
"Safety classification"):
– Control category 4 – PL e to ISO 13849-1
– SIL 3 to IEC 61508-2
– corresponds to SILCL 3 to EN 62061
The safety-relevant current paths with the outputs contacts 47-48 and
57-58 meet the following requirements under observation of a PFH
value assessment (also refer to chapter 2.5 "Safety classification"):
– Control category 3 - PL d to ISO 13849-1
– SIL 2 to IEC 61508-2
– SILCL 2 to EN 62061
To determine the Performance Level (PL) to ISO 13849-1 of the entire
safety function (e.g. sensor, logic, actuator), an assessment of all
relevant components is required.
The entire concept of the control system, in which the safety
component is integrated, must be validated to the relevant
standards.
2.4 Technical data
General data:
Standards: EN 60204-1, IEC 60947-5-1,
ISO 13849-1, IEC 61508
Climate resistance: EN 60068-2-78
Mounting: snaps onto standard DIN rail to EN 60715
Terminal designations: IEC 60947-1
Material of the housings: Plastic, glass-fibre reinforced
thermoplastic, ventilated
Material of the contacts: AgSnO, AgNi, self-cleaning, positive drive
Weight: 420 g
Start conditions: Automatic or start button (monitored)
Feedback circuit available: yes
Pull-in delay for automatic start: typ. 250 ms
Pull-in delay with reset button: typ. 20 ms
Drop-out delay in case of emergency stop: typ. 30 ms / max. 36 ms
Drop-out delay on "supply failure": typ. 80 ms
Mechanical data:
Connection type: Screw connection
Cable sections: 0.25 … 2.5 mm²
Connecting cable: rigid or flexible
Tightening torque for the terminals: 0.6 Nm
With removable terminals: yes
Mechanical life: 10 million operations
Resistance to shock: 10 g / 11 ms
Resistance to vibration: 10 … 150 Hz, Amplitude 0.35 mm
Ambient temperature: –25 °C … +60 °C
Storage and transport temperature: –40 °C … +85 °C
Protection class: Enclosure: IP40
Terminals: IP20
Clearance: IP54
Air clearances and creepage distances to IEC 60664-1: 4 kV/2
(basic insulation)
EMC rating: to EMC Directive
Electrical data:
Contact resistance in new state: max. 100 mΩ
Power consumption: max. 3.2 W / 7.1 VA,
plus signalling outputs
Rated operating voltage Ue:24 VDC: –15% / +20%,
residual ripple max. 10%,
24 VAC: –15% / +10%
Frequency range: 50 / 60 Hz
Fuse rating for the operating voltage: Internal electronic trip,
tripping current F1: > 2.5 A,
tripping current F2: > 50 mA (S11-S31) /
> 800 mA (X4)
Current and voltage at the control circuits:
- S11, S12, S21, S22, S31, S32: 24 VDC, 10 mA
- X1, X2: 24 VDC, start impulse, 350 mA / 15 ms
- X3, X4: 24 VDC, start impulse, 130 mA / 80 ms
- X4, X5: 24 VDC, start impulse 140 mA / 15 ms
Monitored inputs:
Cross-wire detection: optional
Wire breakage detection: yes
Earth connection detection: yes
Number of NO contacts: 0
Number of NC contacts: 2
Cable length: 850 m with 1.5 mm²,
1,400 m with 2.5 mm²
Conduction resistance: max. 40 Ω
Outputs:
Number of safety contacts: 5
Number of auxiliary contacts: 1
Number of signalling outputs: 3

3
SRB 324ST V.3
Operating instructions
Safety-monitoring module
EN
Switching capacity of the safety contacts:
- 13-14, 23-24, 33-34 (STOP 0): max. 250 V, 8 A ohmic (inductive in
case of appropriate protective wiring),
AC-15: 230 VAC / 6 A, DC-13: 24 VDC / 6 A,
Residual current at ambient temperature up to 45°C:
18 A / 55°C: 15 A / 60°C: 12 A
- 47-48, 57-58 (STOP 1): max. 250 V, 6 A ohmic (inductive in case of
appropriate protective wiring),
AC-15: 230 VAC / 3 A, DC-13: 24 VDC / 2 A,
Residual current at ambient temperature up to 45°C:
12 A / 55°C: 10 A / 60°C: 8 A
Switching capacity of the signalling outputs: Y1-Y3: 24 VDC /
100 mA, residual current: 200 mA
Switching capacity of the auxiliary contacts: 61-62: 24 VDC / 2 A
Fuse rating of the safety contacts:
- 13-14, 23-24, 33-34 (STOP 0): external (Ik= 1000 A) to IEC 60947-5-1
Safety fuse 10 A quick blow, 8 A slow blow,
- 47-48, 57-58 (STOP 1): external (Ik= 1000 A) to IEC 60947-5-1
Safety fuse 8 A quick blow, 6.3 A slow blow
Fuse rating for the auxiliary contacts: external (Ik= 1000 A)
to IEC 60947-5-1
Safety fuse 2.5 A quick blow, 2 A slow blow
Utilisation category to IEC 60947-5-1: AC-15: 230 V / 3 A
DC-13: 24 V / 2 A
Dimensions H x W x D: 100 mm × 45 mm × 121 mm
The data specified in this manual are applicable when the component is
operated with rated operating voltage Ue±0%.
Use copper conductors only.
Use 60°C/75°C conductors
Use No. 28-12 AWG wire size only
Tightening torque: 5 lb in.
Use 60/75°C wire only
2.5 Classification
Standards: ISO 13849-1, IEC 61508
PL: STOP 0: up to e,
STOP 1: up to d
Category: STOP 0: up to 4,
STOP 1: up to 3
PFH: STOP 0: ≤ 2.0 x 10-8/h,
STOP 1: ≤ 2.0 x 10-7/h
DC: STOP 0: 99% (high),
STOP 1: > 60% (low)
CCF: > 65 points
SIL: STOP 0: suitable for SIL 3 applications
STOP 1: suitable for SIL 2 applications
Mission time: 20 years
B10D value (for one channel of the relay output): 20%: 20,000,000
40%: 7,500,000
60%: 2,500,000
80%: 1,000,000
100%: 400,000
MT
TF
Bdxx
hs/h3600
D
10Dopop
op
n
0,1 x nop tcycle
For an average annual demand rate of nop = 126,720 cycles per year,
Performance Level PL e can be obtained at maximum load.
nop = average number of activations per year
dop = average number of operating days per year
hop = average number of operating hours per day
tcycle = average demand rate of the safety function in s
(e.g. 4 × per hour = 1 × per 15 min. = 900 s)
(Determined values can vary depending on the application-specific
parameters hop, dop and tcycle as well as the load.)
The PFH values of 2.0 x 10-8/h and 2.0 × 10-7/h applies to the
combinations of contact load (current through enabling contacts) and
number of switching cycles (nop/y) mentioned in the table below. At 365
operating days per year and a 24-hours operation, this results in the
below-mentioned switching cycle times (tcycle) for the relay contacts.
Diverging applications upon request.
Contact load nop/y tcycle
20 % 525,600 1.0 min
40 % 210,240 2.5 min
60 % 75,087 7.0 min
80 % 30,918 17.0 min
100 % 12,223 43.0 min
3. Mounting
3.1 General mounting instructions
Mounting: snaps onto standard DIN rails to EN 60715.
Snap the bottom of the enclosure slightly tilted forwards in the DIN rail
and push up until it latches in position.
To avoid EMC disturbances, the physical ambient and
operational conditions at the place where the product
is installed, must meet the provisions laid down in the
paragraph "Electromagnetic Compatibility (EMC)" of
EN 60204-1.
3.2 Dimensions
All measurements in mm.
Device dimensions (H/W/D): 100 x 45 x 121 mm
with plugged-in terminals: 120 × 45 × 121 mm
4. Electrical connection
4.1 General information for electrical connection
As far as the electrical safety is concerned, the protection
against unintentional contact of the connected and therefore
electrically interconnected apparatus and the insulation of the
feed cables must be designed for the highest voltage, which
can occur in the device.
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
Wiring examples: see appendix
5. Operating principle and settings
5.1 LED functions
• K1: Status channel 1
• K2: Status channel 2
• K3/K4: Status delayed enabling circuit (LED is ON, when the delayed
enabling circuits 47-48, 57-58 are closed)
• UB: Status operating voltage (LED is on, when the operating voltage
on the terminals A1-A2 is ON)
• Ui: Status internal operating voltage (LED is on, when the operating
voltage on the terminals A1-A2 is ON and the fuse has not been
triggered).

4
Operating instructions
Safety-monitoring module SRB 324ST V.3
EN
5.2 Description of the terminals
(see Fig. 1)
Voltages: A1
A1.1
A2
+24 VDC / 24 VAC
+24 VDC / 24 VAC
0 VDC / 24 VAC
Inputs: S11-S12
S21-
S22
S31-
S32
Input channel 1 (+)
Input channel 2 (–) (with cross-wire short
detection)
Input channel 2 (+) (without cross-wire short
detection)
Outputs: 13-14
23-24
33-34
47-48
57-58
61-62
First safety enabling circuit (STOP 0)
Second safety enabling circuit (STOP 0)
Third safety enabling circuit (STOP 0)
Fourth safety enabling circuit (STOP 1)
Fifth safety enabling circuit (STOP 1)
Auxiliary NC contact
Start: X1-X2
X3-X4
X4-X5
Y1 + Y2
Y3
RT
Feedback circuit
Feedback circuit and external reset (monitored)
Automatic start
Signalling output channel 1 and 2
Fuse F3
Reset timer
Signalling outputs must not be used in safety circuits.
Opening the front cover (see Fig. 2)
• To open the front cover, insert a slotted screwdriver in the top and
bottom cover notch and gently lift it.
• When the front cover is open, the electrostatic discharge requirements
must be respected and observed.
• After setting, the front cover must be fitted back in position.
• The set drop-out delay must be entered on the front cover.
Only touch the components after electrical discharge!
UB
Ui
K1
K2
K3
K4
13 23 33 61
A1 S11S12 X5
A2 S21A1.1S22
14 24 34 62
47 57 Y1
X3 X1
S32
X2 Y2
X4 S32
X3
S3
1R
T
48 58 Y3
SRB 324ST
V.3
t: ………… s
UB
Ui
K1
K2
K3
K4
13 23 33 61
A1 S11 S12 X5
A2 S21 A1.1 S22
14 24 34 62
47 57 Y1
X3 X1
S32
X2 Y2
X4 S32
X3
S31 RT
48 58 Y3
SRB 324ST
V.3
t: ………… s
Fig. 1 Fig. 2
Time setting (see Fig. 3 and 4)
DIP switch settings:
• The DIP switches are located underneath the front cover of
the safety-monitoring module (see Fig. 3 and 4).
• Both DIP switches SW 1 (channel 1) and SW 2 (channel 2)
must be set identically.
• The DIP switches can be set when the operating voltage
is on; however, in order for the setting to be saved in the
SRB, the voltage supply must be interrupted for approx. 3
seconds.
• The functionality of the setting must be checked.
ONON
SW1
SW2
11 22 3
34
4
S1
Fig. 3
DIP switch
setting
Drop-out delay DIP switch
setting
Drop-out delay
ON
1234
<0,1 s
ON
1234
5.0 s
ON
1234
0.5 s
ON
1234
8.5 s
ON
1234
1.0 s
ON
1234
10.0 s
ON
12
34
1.5 s
ON
12
34
12.0 s
ON
1234
2.0 s
ON
1234
15.0 s
ON
1234
2.5 s
ON
1234
20.0 s
ON
1234
3.0 s
ON
1234
25.0 s
ON
1234
4.0 s
ON
1234
30.0 s
Fig. 4 (Tolerance ± 2%)
Resetting the hybrid fuse
• The hybrid fuse of the safety-monitoring module can be reset by
switching the operating voltage off and back on or by actuating
button S1.
• Button S1 is located underneath the front cover of the safety-
monitoring module (see Fig. 2 and 3).

5
SRB 324ST V.3
Operating instructions
Safety-monitoring module
EN
5.3 Notes
Reduction of the delay time (see Fig. 5)
• The drop-out delay time can be terminated prematurely via the
input RT.
• The drop-out delay can be prematurely terminated by supplying
terminal RT with +24 V (rising edge).
• The +24V is made available either at the terminals S11, S31, X4 or
A1.1.
Delayed enabling circuits (see Fig. 6)
• The drop-out delay of the safety enabling circuits 47-48 and 57-58 can
be set within the range of 0...30 seconds by means of DIP switches.
The DIP switches are located underneath the front cover of the safety-
monitoring module.
• The safety enabling circuits 47-48 and 57-58 meet STOP category 1
to EN 60204-1.
• The safety enabling circuits 13-14, 23-24 and 33-34 meet STOP
category 0 to EN 60204-1.
Signalling outputs (see Fig. 7)
• The input circuits are signalled through the signalling outputs Y1
(channel 1) and Y2 (channel 2).
• The hybrid fuse of the safety-monitoring module can be reset by
switching the operating voltage off and back on or by actuating
button S1.
• Button S1 is located underneath the front cover of the safety-
monitoring module.
• The status of the hybrid fuse is signalled through signalling output
Y3. If the hybrid fuse is not activated, Y3 is supplied with operating
voltage.
RT
S11
48
47
58
57 +24 V
F3
Y3Y2Y1
Fig. 5 Fig. 6 Fig. 7
5.4 Setting report SRB 324ST V.3
This report regarding the setting of the device must be completed
accordingly by the customer, enclosed in the technical manual of the
machine and indicated on the front cover.
The setting report must be available whenever a safety check is
performed.
Company:
The safety-monitoring module is used in the following machine:
Machine n° Machine type Module n°
Set drop-out delay:
Set on (date) Signature of the responsible person
6. Set-up and maintenance
6.1 Functional testing
The safety function of the safety-monitoring module must be tested.
The following conditions must be previously checked and met:
1. Correct fixing
2. Check the integrity of the cable entry and connections
3. Check the safety-monitoring module's enclosure for damage.
4. Check the electrical function of the connected sensors and their
influence on the safety-monitoring module and the downstream
actuators
6.2 Maintenance
A regular visual inspection and functional test, including the following
steps, is recommended:
1. Check the correct fixing of the safety-monitoring module
2. Check the cable for damages
3. Check electrical function
4. Check drop-out delay
The device has to be integrated into the periodic check-ups
according to the Ordinance on Industrial Safety and Health,
however at least 1 × year.
Damaged or defective components must be replaced.
7. Disassembly and disposal
7.1 Disassembly
The safety-monitoring module must be disassembled in a de-energised
condition only.
Push up the bottom of the enclosure and hang out slightly tilted
forwards.
7.2 Disposal
The safety-monitoring module must be disposed of in an appropriate
manner in accordance with the national prescriptions and legislations.
8. Appendix
8.1 Wiring examples
Dual-channel control, shownfora guard door monitor; with two
contacts A and B, where at least one is a positive break contact;
with external reset button J
• Relay outputs: Suitable for 2-channel control, for increase in capacity
or number of contacts by means of contactors or relays with positive-
guided contacts.
• The control system recognises wire breakage, earth faults and cross-
wire shorts in the monitoring circuit.
• F2 = hybrid fuse 50 mA / 800 mA
•
S
= feedback circuit
A1 A1.1 S21 S22 S11 X5
J
X3 X4 S12 X1 X2 S32 S31 13 23 33 47
L1
57
K2
K1
K4
K
A
K
B
K3
K
B
K
A
K2
K1
61
A2 14 24 34 48RT Y3 Y2 Y1 58 62
S
Timer Timer
K4K2
K2
a)
K3
K4
K3
K1
K1
F2
F1
Fig. 8 a) channel control

6
Operating instructions
Safety-monitoring module SRB 324ST V.3
EN
8.2 Start configuration
External reset button (with edge detection) (see Fig. 9)
• The external reset button is integrated as shown.
• The safety-monitoring module is activated by the reset (after release)
of the reset button (= detection of the trailing edge). Faults in the reset
button, e.g. welded contacts or manipulations which could lead to an
inadvertent restart, are detected in this configuration and will result in
an inhibition of the operation.
• An output with 24 V / 250 mA must be made available by the control
system. This output must be connected to X3. X3 must be switched on
for at least 100 ms (HIGH). The safety-monitoring module is activated
by switching the output off (LOW).
Automatic start (see Fig. 10)
• The automatic start is programmed by connecting the feedback circuit
to the terminals. If the feedback circuit is not required, establish a
bridge.
Not admitted without additional measure due to the risk of
gaining access by stepping behind!
Caution: When the 324ST V.3 safety-monitoring module is
used with the operating mode "Automatic start", an automatic
restart after a shutdown in case of emergency must be
prevented by the upstream control to EN 60204-1 paragraph
9.2.5.4.2.
X4
J
S
X3
OR
X2
X1
S
X3
24 V/250 mA
>100 ms
a)
X2
X1
K
B
K
A
X2
S
X1
K
B
K
A
X5
X4
Fig. 9 a) Controller Fig. 10
8.3 Sensor configuration
Dual-channel control of a safety-related electronic
(microprocessor-based) safety guard with p-type transistor
outputs e.g. AOPDs to IEC 61496 (see Fig. 13)
• Wire breakage and earth leakage in the control circuits are detected.
• The safety-monitoring module therefore is not equipped with a cross-
wire short detection here. The safety-monitoring module therefore is
not equipped with a cross-wire short detection here.
• If cross-wire shorts in the control circuits are detected by the safety
guard:
Control category 4 – PL e to ISO 13849-1 possible.
Single-channel emergency stop circuit with command devices to
ISO 13850 and IEC 60947-5-5 (see Fig. 12)
• Wire breakage and earth leakage in the control circuits are detected.
• Category 1 – PL c to ISO 13849-1 possible.
Dual-channel emergency stop circuit with command devices to
ISO 13850 and IEC 60947-5-5 (see Fig. 13)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are not detected.
• Control category 4 – PL e to ISO 13849-1 possible
(with protective wiring)
S12
+24V
S32
+24V
S22
S21
S12
S11
S32
S12
S22
S21
S12
S11
S32
S31
S22
S21
Fig. 11 Fig. 12 Fig. 13
Dual-channel emergency stop circuit with command devices to
ISO 13850 and IEC 60947-5-5 (see Fig. 14)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are detected.
• Category 4 – PL e to ISO 13849-1 possible.
Single-channel guard door monitoring circuit with interlocking
devices to ISO 14119 (see Fig. 15)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Category 1 – PL c to ISO 13849-1 possible.
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (see Fig. 16)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the monitoring circuits are not detected.
• Control category 4 – PL e to ISO 13849-1 possible
(with protective wiring)
S12
S11
S22
S21
S32
S31
S12
S11
S32
S12
S22
S21
S12
S11
S32
S31
S22
S21
Fig. 14 Fig. 15 Fig. 16
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (see Fig. 17)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the guard monitoring circuits are detected.
• Category 4 – PL e to ISO 13849-1 possible.
Dual-channel control of magnetic safety switches according to
IEC 60947-5-3 (see Fig. 18)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are not detected.
• Category 3 – PL e to ISO 13849-1 possible.
Dual-channel control of magnetic safety switches according to
IEC 60947-5-3 (see Fig. 19)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are detected.
• Category 4 – PL e to ISO 13849-1 possible.

7
SRB 324ST V.3
Operating instructions
Safety-monitoring module
EN
S12
S11
S22
S21
S32
S31
S32
S31
S12
S11
S22
S21
S22
S21
S12
S11
S32
S31
Fig. 17 Fig. 18 Fig. 19
The connection of magnetic safety switches to the
SRB 324ST V.3 safety-monitoring module is only admitted
when the requirements of the standard IEC 60947-5-3 are
observed.
As the technical data are regarded, the following minimum
requirements must be met:
– switching capacity: min. 240 mW
– switching voltage: min. 24 VDC
– switching current: min. 10 mA
For example, the following safety sensors meet the
requirements:
– BNS 33-02Z-2187, BNS 33-02ZG-2187
– BNS 260-02Z, BNS 260-02ZG
– BNS 260-02-01Z, BNS 260-02-01ZG
When sensors with LED are wired in the control circuit
(protective circuit), the following rated operating voltage must
be observed and respected:
– 24 VDC with a max. tolerance of –5 %/+ +20 %
– 24 VAC with a max. tolerance of –5 %/+ +10 %
Otherwise availability problems could occur, especially in
series-wired sensors, where a voltage drop in the control
circuit is triggered by LEDs for instance.
8.4 Actuator configuration
Single-channel control with feedback circuit (see Fig. 20)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
•
S
= feedback circuit:
If the feedback circuit is not required, establish a bridge.
Dual-channel control with feedback circuit (see Fig. 21)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
• S= feedback circuit:
If the feedback circuit is not required, establish a bridge.
X1 X2 4713
4814
K
B
K
AS
L1
N
K
A
K
C
X1 X2 4713
4814
K
B
K
C
K
D
K
A
K
B
L1
N
K
A
K
D
K
C
S
Fig. 20 Fig. 21
Differential control with feedback circuit (see Fig. 22)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
•
S
= feedback circuit:
If the feedback circuit is not required, establish a bridge. If the enabling
circuit of the controller must be equipped with its own feedback circuit,
this circuit must be integrated as shown in the wiring example "dual-
channel control with feedback circuit" (see there).
X1 X2 4713
4814
K
A
L1
N
K
A
S
a)
Fig. 22 a) Enabling signal controller

8EN
SRB324ST-V3-E-DE
Operating instructions
Safety-monitoring module SRB 324ST V.3
Name of the component: SRB324ST V.3
Description of the component: Safety-monitoring module for emergency stop circuits,
guard door monitoring, magnetic safety switches and
AOPDs
Relevant Directives: Machinery Directive
EMC-Directive
RoHS-Directive
2006/42/EC
2014/30/EU
2011/65/EU
Applied standards: EN 60947-5-1:2004 + AC:2005 + A1:2009,
EN 60947-5-3:2013 (in extracts),
ISO 13850:2015,
ISO 13849-1:2015,
ISO 13849-2:2012
Notied body for the prototype test: TÜV Rheinland Industrie Service GmbH
Alboinstr. 56, 12103 Berlin
ID n°: 0035
EC-prototype test certicate: 01/205/5222.01/17
Person authorised for the compilation
of the technical documentation:
Oliver Wacker
Möddinghofe 30
42279 Wuppertal
9. EU Declaration of conformity
K.A. Schmersal GmbH & Co. KG
Möddinghofe 30, 42279 Wuppertal
Germany
Phone: [phone]
Telefax: [phone]
E-Mail: [email protected]
Internet: www.schmersal.com
Place and date of issue: Wuppertal, March 27, 2019
Authorised signature
Philip Schmersal
Managing Director
EU Declaration of conformity
Original K.A. Schmersal GmbH & Co. KG
Möddinghofe 30
42279 Wuppertal
Germany
Internet: www.schmersal.com
We hereby certify that the hereafter described components both in their basic design and construction conform
to the applicable European Directives.
The currently valid declaration of conformity can be
downloaded from the internet at www.schmersal.net.