schmersal RSS 36-D-R-ST5 User manual

INSTRUCTIONS FOR OPERATION AND
ASSEMBLY
ELECTRONIC SAFETY-SENSOR RSS 36-
D-R-ST5
Table of Contents
1 About this document
1.1 Function
1.2 Target group of the operating instructions: authorised qualified personnel
1.3 Explanation of the symbols used
1.4 Appropriate use
1.5 General safety instructions
2 Product description
2.1 Ordering code
2.2 Special versions
2.3 Purpose
2.4 Warning about misuse
2.5 Exclusion of liability
3 Technical Data
4 Mounting
4.1 General mounting instructions
4.2 Dimensions
4.3 Accessories
4.4 Switch distance
4.5 Adjustment
5 Electrical connection
5.1 General information for electrical connection
5.2 Serial diagnostic -SD
5.3 Wiring examples for series-wiring
5.4 Wiring configuration and connector accessories
6 Actuator coding
7 Working principle and diagnostic function
7.1 Mode of operation of the safety outputs
7.2 Diagnostic-LEDs
7.3 Operating principle of the electronic diagnostic output
7.4 Safety-sensors with serial diagnostic function
8 Set-up and maintenance
9 Disassembly and disposal
9.1 Disassembly
9.2 Disposal
1 About this document

1.1 Function
This document provides all the information you need for the mounting, set-up and commissioning to ensure the safe
operation and disassembly of the switchgear. The operating instructions enclosed with the device must always be
kept in a legible condition and accessible.
1.2 Target group of the operating instructions: authorised qualified
personnel
All operations described in the 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.
The information contained in this operating instructions manual is provided without liability and is subject to
technical modifications.
1.3 Explanation of the symbols used
FInformation, hint, note: This symbol is used for identifying useful additional information.
2
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
Products in Schmersal's range are not intended to be used by private end consumers.
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 switchgear 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.

FFurther technical information can be found in the Schmersal catalogues or in the online catalogue on the Internet:
products.schmersal.com.
2 Product description
2.1 Ordering code
Product type description:
RSS 36 (1)-(2)-(3)-(4)
(1)
without Standard coding
I1 Individual coding
I2 Individual coding, re-teaching enabled
(2)
without without diagnostic function (only on request for ST5)
DWith diagnostic output
SD with serial diagnostics (only for ST)
(3)
without without latching
Rwith latching, latching force approx. 18 N
(4)
ST Connector plug M12, 8-pole
ST5 Connector plug M12, 5-pole
2.2 Special versions
For special versions, which are not listed in the ordering code, these specifications apply accordingly, provided that
they correspond to the standard version.
2.3 Purpose
This non-contact, electronic safety sensor is designed for application in safety circuits and is used for monitoring the
position of movable safety guards. In this application, the safety sensor monitors the position of hinged, sliding or
removable safety guards by means of the coded electronic actuator.

The safety function consists of safely switching off the safety outputs when the safety guard is opened and
maintaining the safe switched off condition of the safety outputs for as long as the safety guard is open.
F
The safety switchgears are classified according to ISO 14119 as type 4 interlocking devices. Designs with individual coding are classified
as highly coded.
Safety sensors and actuators with latching (ordering suffix 'R') always must be used in pairs. The latching force
(approx. 18 N) exercised by the permanent magnet keeps hatches and small guards closed, also in a de-energised
condition.
The system can be used as a door end stop up to 5 kg at 0.25 m/s.
The diagnostic output of the safety sensor alternatively can be used as a conventional output or as a “serial output“
with input and output channel.
Series-wiring
Series-wiring can be set up. In the case of a series connection, the risk time remains unchanged and the reaction
time increases by the sum of the reaction time of the inputs per additional unit specified in the technical data. The
quantity of devices is only limited by the cable drops and the external cable fuse protection, according to the
technical data. Up to 31 device variants with serial diagnostics can be wired in series.
2The user must evaluate and design the safety chain in accordance with the relevant standards and the required safety
level. If multiple safety sensors are involved in the same safety function, the PFH values of the individual components must
be added.
2The entire concept of the control system, in which the safety component is integrated, must be validated to the relevant
standards.
2.4 Warning about misuse
2In case of improper use or manipulation of the safety switchgear, personal hazards or damages to machinery or plant
components cannot be excluded. There are no residual risks, provided that the safety instructions as well as the
instructions regarding mounting, commissioning, operation and maintenance are observed.
2.5 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from defective mounting or failure to comply
with the 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.
3 Technical Data
Approvals - Standards

Certificates TÜV
cULus
ECOLAB
FCC
IC
General data
Standards EN ISO 13849-1
EN IEC 60947-5-3
EN IEC 61508
Coding Universal coding
Coding level according to EN ISO 14119 Low
Working principle RFID
Frequency band RFID 125 kHz
Transmitter output RFID, maximum -6 dB/m
Housing construction form Block
Installation conditions (mechanical) not flush
Sensor topology Individual sensor or end sensor in a series
Enclosure material Plastic, glass-fibre reinforced thermoplastic, self-extinguishing
Active area Glass-fibre, reinforced thermoplastic
Gross weight 100 g
Time to readiness, maximum 2,000 ms
Reaction time, maximum 100 ms
Duration of risk, maximum 200 ms
Reaction time, switching off safety outputs via actuator, maximum 100 ms
Reaction time, switching off safety outputs via safety inputs,
maximum
0.5 ms
General data - Features
Diagnostic output Yes
Short circuit detection Yes
Cross-circuit detection Yes
Safety functions Yes
Cascadable Yes
Integral system diagnostics, status Yes
Number of LEDs 3
Number of semi-conductor outputs with signaling function 1
Number of fail-safe digital outputs 2
Safety classification

Standards EN ISO 13849-1
EN IEC 61508
Performance Level, up to e
Category 4
PFH value 2.70 x 10⁻¹⁰ /h
PFD value 2.10 x 10⁻⁵
Safety Integrity Level (SIL), suitable for applications in 3
Mission time 20 Year(s)
Mechanical data
Actuating panels lateral
Active area lateral
Hysteresis (Switching distance), maximum 2 mm
Repeat accuracy R 0.5 mm
Note (Repeat accuracy R) Axial offset: The long side allows for a maximum height
misalignment (x) of sensor and actuator of 8 mm (e.g. mounting
tolerance or due to guard door sagging). The axial misalignment (y)
is max. ± 18 mm (see figure: Operating principle). Minimum
clearance between two sensor systems 100 mm.
Latching force, approx. 18 N
Mounting A screw length of 25 mm is sufficient for sensor mounting and for
side mounting of the actuators. 30 mm long screws are
recommended when the actuator is mounted upright and/or when
the sealing discs are used.
Type of the fixing screws 2x M4 (cylinder head screws with washers DIN 125A / form A)
Tightening torque of the fixing screws, minimum 2.2 Nm
Tightening torque of the fixing screws, maximum 2.5 Nm
Mechanical data - Switching distances according EN IEC 60947-5-3
Assured switching distance "ON" Sao 10 mm
Assured switching distance "OFF" Sar 20 mm
Switch distance, typical 12 mm
Mechanical data - Connection technique
Termination Connector M12, 5-pole, A-coded
Note (length of the sensor chain) Cable length and cross-section change the voltage drop dependiing
on the output current
Mechanical data - Dimensions
Length of sensor 22 mm

Width of sensor 106.3 mm
Height of sensor 25 mm
Ambient conditions
Degree of protection IP65
IP67
IP69
Ambient temperature, minimum -25 °C
Ambient temperature, maximum +70 °C
Storage and transport temperature, minimum -25 °C
Storage and transport temperature, maximum +85 °C
Relative humidity, maximum 93 %
Note (Relative humidity) non-condensing
non-icing
Resistance to vibrations 10 … 55 Hz, amplitude 1 mm
Restistance to shock 30 g / 11 ms
Protection class III
Permissible installation altitude above sea level, maximum 2,000 m
Storage and transport temperature -25 ... +85 °C
Ambient conditions - Insulation values
Rated insulation voltage Ui32 VDC
Rated impulse withstand voltage Uimp 0.8 kV
Overvoltage category III
Degree of pollution 3
Electrical data
Operating voltage 24 VDC -15 % / +10 %
Note (Power supply, general) stabilised PELV power supply
Operating current, minimum 0.5 mA
No-load supply current I0, maximum 35 mA
Rated operating voltage 24 VDC
Operating current 600 mA
Required rated short-circuit current 100 A
Switching frequency, maximum 1 Hz
Electrical data - Safety digital outputs
Designation, Safety outputs Y1 and Y2

Rated operating current (safety outputs) 250 mA
Output current, (fail-safe output), maximum 0.25 A
Design of control elements short-circuit proof, p-type
Voltage drop Ud, maximum 1 V
Leakage current Ir, maximum 0.5 mA
Voltage, Utilisation category DC-12 24 VDC
Current, Utilisation category DC-12 0.25 A
Voltage, Utilisation category DC-13 24 VDC
Current, Utilisation category DC-13 0.25 A
Test pulse duration, maximum 0.3 ms
Test pulse interval, typical 1000 ms
Classification ZVEI CB24I, Source C2
Classification ZVEI CB24I, Sink C1
C2
Electrical data - Diagnostic outputs
Designation, Diagnostic outputs OUT
Design of control elements short-circuit proof, p-type
Voltage drop Ud, maximum 2 V
Voltage, Utilisation category DC-12 24 VDC
Current, Utilisation category DC-12 0.05 A
Voltage, Utilisation category DC-13 24 VDC
Current, Utilisation category DC-13 0.05 A
Electrical data - Electromagnetic compatibility (EMC)
Interfering radiation IEC 61000-6-4
EMC rating IEC 60947-3
Status indication
Note (LED switching conditions display) LED yellow: Operating condition
LED green: Supply voltage
LED red: Fault
Pin assignment
PIN 1 1A1 Ue: (1)
PIN 2 Y2 safety output 2: White
PIN 3 A2 GND Blue
PIN 4 Y1 Safety output 1 Black

PIN 5 OUT Diagnostic output OUT Grey
UL notice
]Max. environmental temperature 69 °C.
FCC/IC - Note
This device complies with Part 15 of the FCC Rules and contains licence-exempt transmitter/receivers that are
compliant with ISED (Innovation, Science and Economic Development) Canada licence-exempt RSS standard(s).
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference signals, and
(2) This device must be able to tolerate interference signals. These also include interference signals that could
cause the device to function improperly.
This device complies with the nerve stimulation limits (ISED SPR-002) when operated at a minimum distance of 100
mm. Changes or modifications not expressly approved by K.A. Schmersal GmbH & Co. KG could void the user's
authority to operate the equipment.
The licence-free transmitter/receiver contained in this device satisfies the requirements of the "Radio Standards
Specification" of the Innovation, Science and Economic Development Canada (ISED) authority that apply to licence-
free radio equipment. Operation is permissible under the following two conditions:
(1) The device must not create disturbances.
(2) The device must tolerate received radio frequency interference, even if this could impair its functionality.
This device complies with the nerve stimulation limits (ISED CNR-102) when operated at a minimum distance of 100
mm.
In the event of changes or modifications that have not been expressly approved by K.A. Schmersal GmbH & Co. KG,
the user's authorisation to use the device may become ineffective.
4 Mounting
4.1 General mounting instructions
2Please observe the relevant requirements of the standards ISO 12100, ISO 14119 and ISO 14120.
Ensure the safety sensor and actuator is mounted on a flat surface. The component can be mounted in any position.
The universal mounting holes provide for a variable mounting by means of M4 screws. Mounting: a screw length of
25 mm is sufficient for sensor mounting and for side mounting of the actuators. 30 mm long screws are
recommended when the actuator is mounted upright and/or when the sealing discs are used. (Tightening torque
2,2...2,5 Nm). The labelled surfaces of the safety sensor and the actuator have to be opposite. The safety sensor
must only be used within the assured switching distances ≤ sao and ≥ sar.
To avoid any interference inherent to this kind of system and any reduction of the switching distances, please
observe the following guidelines:
The presence of metal chips in the vicinity of the sensor is liable to modify the switching distance.
Keep away from metal chips
Minimum distance 100 mm between two safety sensors as well as other systems with same frequency (125
kHz)

2The actuator must be permanently fitted to the safety guards and protected against displacement by suitable measures
(tamperproof screws, gluing, drilling of the screw heads).
4.2 Dimensions
All measurements in mm.
Safety sensor
Actuator
FAlternative suitable actuators with different design: refer to products.schmersal.com.
4.3 Accessories

Set of disposable screws (order separately)
- 4x M4x25 incl. washers, order number 101217746
- 4x M4x30 incl. washers, Bestellnummer 101217747
Sealing kit (order separately)
- Order number 101215048
- 8 plugs and 4 under seals
- To seal the mounting holes and as a spacer (approx. 3 mm) to facilitate cleaning below the mounting surface
- Also suitable as tamper protection for the screw attachment
4.4 Switch distance
Switching distances in mm to IEC 60947-5-3
Typical switching distance styp: 12
Assured switching distance sao: 10
Assured switch-off distance sar: 20
2There are new switch distances as per the table below owing to the necessity of technical modifications (V2).
Please check the design of your guard system following installation to ensure adherence to the secured switch distances (≤
sao and ≥ sar) in accordance with the specified values and adjust the guard system accordingly.
The positions of the designations V2 should be gleaned from the dimensional drawings.

Switching distances in mm to IEC 60947-5-3 Actuator RST Actuator RST V2
Sensor RSS styp 12 12
sao 10 8
sar 16 16
Sensor RSS V2 styp 12 12
sao 10 10
sar 20 20
FWith the combination of "old sensor - new actuator (V2)" there may be limitations in availability owing to the reduced sao
(8 mm). This change has no affect on the performance level.
The side allows for a maximum height misalignment (X) of sensor and actuator of ± 8 mm (e.g. mounting tolerance
or due to guard door sagging). The axial misalignment (y) is max. ± 18 mm.
FLatching versions X ± 5 mm, Y ± 3 mm.
The latching force will be reduced by misalignment.
Actuating curves
The actuating curves represent the typical switching distance of the safety sensor during the approach of the
actuator subject to the actuating direction
Transverse misalignment Height misalignment
 
FPreferred actuation directions: from front or from side
4.5 Adjustment
The continuous signal of the yellow LED signals the actuator detection; the flashing of the yellow LED signals that
the safety sensor is actuated in the hysteresis area.

FRecommended Adjustment
Align the safety sensor and actuator at a distance of 0.5 x sao.
The correct functionality of both safety channels must be checked by means of the connected safety-monitoring
module.
5 Electrical connection
5.1 General information for electrical connection
2The electrical connection may only be carried out by authorised personnel in a de-energised condition.
The safety outputs can be integrated into the safety circuit of the control system. For applications of PL e / category
4 to EN ISO 13849-1, the safety outputs of the safety sensor or of the sensor chain must be wired to a safety
monitoring-module of the same category.
The required electrical cable fuse protection must be integrated in the installation.
Protection is not required when pilot wires are laid. The cables however must be separated from the supply and
energy cables. The max. fuse rate for a sensor chain depends on the section of the connecting cable of the sensor.
Requirements for the connected safety-monitoring module:
dual-channel safety input, suitable for p-type sensors with NO function
FInformation for the selection of suitable safety-monitoring modules can be found in the Schmersal catalogues or in the
online catalogue on the Internet: products.schmersal.com.
As an alternative to a safety-monitoring module, the safety sensors of the CSS 34F0 or CSS 34F1 series can also be
used as first sensor of a series-wired chain for the direct control and monitoring of safety contactors (refer to
operating manual of CSS 34F0 / CSS 34F1).
If the safety sensor is wired to relays or to non-safety relevant control components, a new risk analysis must be
carried out.
The sensors cyclically switch off the safety output to test them. The safety-monitoring module therefore does not
need to be equipped with a cross-wire short detection. The switch-off times must be tolerated by the safety-
monitoring module. The switch -off time of the safety sensor is additionally extended depending on the cable length
and the capacity of the cable used. Typically, a switch-off time of 250 μs is reached with a 30-m connecting cable.
FConfiguration of the safety-monitoring module
If the safety sensor is connected to electronic safety-monitoring modules, we recommend that you set a discrepancy time
of min. 100 ms. The safety inputs of the safety-monitoring module must be able blanking a test impulse of approx. 1 ms.
The safety-monitoring module does not need to have a cross-wire short monitoring function, if necessary, the cross-wire
short monitoring function must be disabled.
5.2 Serial diagnostic -SD

Cable design
The wiring capacitance of the connecting cable of the safety sensor must not exceed 50 nF.
Depending on the strand structure, normal unshielded 200 m long control cables LIYY 0.25 mm² to 1.5 mm² have a
wiring capacitance of approx. 20 … 50 nF
FOn wiring SD devices, please pay attention to the voltage drop on the cables and the current carrying capacity of the
individual components.
FAccessories for the series-wiring
For convenient wiring and series-wiring of SD components, the SD junction boxes PFB-SD-4M12-SD (variant for the field)
and PDM-SD-4CC-SD (variant for control cabinet on carrier rail) are available along with additional comprehensive
accessories. Detailed information is available on the Internet, products.schmersal.com.
5.3 Wiring examples for series-wiring
Series-wiring can be set up. In the case of a series connection, the risk time remains unchanged and the reaction
time increases by the sum of the reaction time of the inputs per additional unit specified in the technical data. The
number of components is only limited by the external cable protection according to the technical data and the line
loss. Series-wiring of up to 31 RSS 36 … SD components with serial diagnostics is possible.
The application examples shown are suggestions. They however do not release the user from carefully checking
whether the switchgear and its set-up are suitable for the individual application. The application examples shown
are suggestions.
Wiring example 1: Series-wiring of the RSS 36 with conventional diagnostic output
The voltage is supplied to both safety inputs of the last safety sensor of the chain (considered from the safety-
monitoring module).
The safety outputs of the first safety sensor are wired to the safety-monitoring module. The diagnostic output can
be connected for instance to a PLC.
Y1 and Y2 = Safety outputs → Safety monitoring module
Wiring example 2: series-wiring of the RSS 36 with serial diagnostic function
In devices with the serial diagnostics function (ordering suffix -SD), the serial diagnostics connections are wired in
series and connected to a SD-Gateway for evaluation purposes. The voltage is supplied to both safety inputs of the
last safety sensor of the chain (considered from the safety-monitoring module).
The safety outputs of the first safety sensor are wired to the safety-monitoring module. The serial Diagnostic
Gateway is connected to the serial diagnostic input of the first safety sensor.

Y1 and Y2 = Safety outputs → Safety monitoring module
SD-IN → Gateway → Field bus
5.4 Wiring configuration and connector accessories
Function safety switchgear Pin configuration of the
connector
Colour codes of the Schmersal
connectors
Poss.
colour
codes of
other
customary
connectors
8-pin
version ST
5-pin
version ST
8-pin version ST 5-pin
version ST
to IEC
60947-5-2:
2007
with
convention
al
diagnostic
outpu
with serial
diagnostic
function  
IP67 / IP69
(PUR)
IP69 (PVC) IP67 / IP69
(PUR)
A1 Ue 1 1 WH BN BN BN
X1 Safety input 1 2  BN WH  WH
A2 GND 3 3 GN BU BU BU
Y1 Safety output 1 4 4 YE BK BK BK
OUT Diagnoseaus
gang
SD-output 5 5 GY GY GY GY
X2 Safety input 2 6  PK VT  PK
Y2 Safety output 2 7 2 BU RD WH VT
IN without
function
SD-input 8  RD PK  OR
Connecting cables with coupling (female) IP67 / IP69, M12, 8-pole - 8 x 0.25 mm² to DIN 47100
Cable length Ordering code
2,5 m 103011415
5,0 m 103007358
10,0 m 103007359
15,0 m 103011414

Connecting cables with coupling (female) IP69K, M12, 8-pole - 8 x 0,21 mm²
Cable length Ordering code
5,0 m 101210560
5,0 m, angled 101210561
10,0 m 103001389
15,0 m 103014823
Connecting cables (PUR) with coupling (female) IP67 / IP69, M12, 5-pole - 5 x 0.34 mm² to EN 60947-5-2
Cable length Ordering code
5.0 m 103010816
10.0 m 103010818
15.0 m 103010820
6 Actuator coding
Safety sensors with standard coding are ready to use upon delivery.
Individually coded safety sensors and actuators will require the following "teach-in" procedure:
1. Energise the safety sensor.
2. Introduce the actuator in the detection range. The teach-in procedure is signalled at the safety sensor, red
LED on, yellow LED flashes (1 Hz).
3. After 10 seconds, brief yellow cyclic flashes (3 Hz) request the switch-off of the operating voltage of the
solenoid interlock. (If the voltage is not switched off within 5 minutes, the safety sensor cancels the "teach-
in" procedure and signals a false actuator by 5 red flashes).
4. Once the operating voltage is switched back on, the actuator must be detected once more in order to
activate the actuator code that has been taught in. In this way, the activated code is definitively saved!
For ordering suffix -I1, the executed allocation of safety switchgear and actuator is irreversible.
For ordering suffix -I2, the "teach-in" procedure for a new actuator can be repeated an unlimited number of times.
When a new actuator is taught, the code, which was applicable until that moment, becomes invalid. Subsequent to
that, an enabling inhibit will be active for ten minutes, thus providing for an increased protection against tampering.
The green LED will flash until the expiration of the time of the enabling inhibit and the detection of the new
actuator. In case of power failure during the lapse of time, the 10-minutes tampering protection time will restart.
7 Working principle and diagnostic function
7.1 Mode of operation of the safety outputs
The safety outputs can be integrated into the safety circuit of the control system.
The opening of a safety guard, i.e. the actuator is removed out of the active zone of the sensor, will immediately
disable the safety outputs of the sensor.
7.2 Diagnostic-LEDs

The safety sensor indicates the operating condition and faults by means of three-colour LEDs located in the lateral
surfaces of the sensor.
FThe following LED indicators are the same for safety sensors with conventional diagnostic output as for those with a serial
diagnostic function.
The green LED indicates that the safety sensor is ready for operation. The supply voltage is on and all safety inputs
are present.
Flashing (1Hz) of the green LED signals that a voltage is missing on one or both of the safety inputs (X1 and/or X2).
The yellow LED always signals the presence of an actuator within range. If the actuator is operating in the limit area
of the sensor switching distance, it will be indicated by flashing.
The flashing can be used to prematurely detect variations in the clearance between the sensor and the actuator
(e.g. sagging of a safety guard). The sensor must be adjusted before the distance to the actuator increases and
before the safety outputs are disabled, thus stopping the machine. If an error is detected, the red LED will be
activated.
LED indication (red)  Error cause
1 flash pulse  Error output Y1
2 flash pulses  Error output Y2
3 flash pulses  Cross-wire Y1/Y2
4 flash pulses  ambient temperature too high
5 flash pulses  Wrong or defective actuator
Continuous red  Internal fault, with yellow flashing teaching
procedure
7.3 Operating principle of the electronic diagnostic output
A diagnostic output additionally indicates the switching condition of the safety switchgear. These signals can be
used in a downstream control.
The short-circuit proof diagnostic output OUT can be used for central visualisation or control tasks, e.g. in a PLC.
The diagnostic output is not a safety-related output.
Error
Errors which no longer guarantee the function of the safety switchgear (internal errors) cause the safety outputs to
be disabled within the duration of risk. After fault rectification, the error message is reset by opening and re-closing
the corresponding safety guard.
Error warning
A fault that does not immediately endanger the safety function of the safety switchgear (e.g. too high ambient
temperature, safety output at external potential, cross-circuit) leads to delayed shutdown. This signal combination,
diagnostic output disabled and safety channels still enabled, can be used to stop the production process in a
controlled manner.
An error warning is deleted when the cause of error is eliminated.
If the fault warning remains on for 30 minutes, the safety outputs are also switched off (red LED flashes).

Table 1: Examples of the diagnostic function of the safety-sensor with conventional diagnostic output
Sensor function LED's Diagnostic-
output
Safety
outputs
Comments
green red yellow  Y1, Y2 
I. Supply voltage On Off Off 0 V 0 V Voltage on, no
evaluation of
the voltage
quality
II. actuated Off Off On 24 V 24 V The yellow LED
always signals
the presence
of an actuator
within range.
III. Actuated,
actuator in
limit area
Off Off Flashes
(1Hz)
24 V
pulsed
24 V The sensor
must be
adjusted
before the
distance to the
actuator
increases and
before the
safety outputs
are disabled,
thus stopping
the machine.
IV. Error warning,
sensor
actuated
Off Flashes Off 0 V 24 V After 30
minutes if the
error is not
rectified
V. Error Off Flashes Off 0 V 0 V Refer to table
with flash
codes
VI. Teach actuator Off On Flashes 0 V 0 V Sensor in
teaching mode
VII. Protection time Flashes Off Off 0 V 0 V 10 minutes
pause after re-
teaching
VIII. Error in input
circuit X1
and/or X2
Flashes
(1Hz)
Off Off 0 V 0 V Example: door
open; a door in
the safety
circuit
upstream is
also open.
IX. Error in input
circuit X1
and/or X2
Flashes
(1Hz)
Off On 24 V 0 V Example: door
closed, a door
in the safety
circuit
upstream is
open.
7.4 Safety-sensors with serial diagnostic function
Safety sensors with serial diagnostic cable have a serial input and output instead of the conventional diagnostic
output. If RSS / CSS safety sensors are wired in series, the safety channels as well as the inputs and outputs of the

diagnostic channels are wired in series.
Up to 31 safety switchgear devices can be connected in series with serial diagnostics. For the evaluation of the
serial diagnostics line either the PROFIBUS-Gateway SD-I-DP-V0-2 or the Universal-Gateway SD-I-U-… are used. This
SD-Gateway is integrated as a slave in an existing field bus system. In this way, the diagnostic signals can be
evaluated by means of a PLC. The necessary software for the integration of the SD-Gateway is available for
download at products.schmersal.com.
The response data and the diagnostic data are automatically and permanently written in the assigned input byte of
the PLC for each safety sensor in the series-wired chain.
The request data for each safety sensor are transmitted to the device through an output byte of the PLC.
In the event of a communication error between the SD-Gateway and the safety sensor, the switching condition of
the safety output of the safety sensor is maintained.
Bit 0: safety outputs enabled
Bit 1: safety sensor actuated, actuator identified
Bit 4: both safety inputs live
Bit 5: safety sensor actuated in hysteresis area
Bit 6: error warning, switch-off delay activated
Bit 7: error, safety outputs switched off
Error
Errors which no longer guarantee the function of the safety switchgear (internal errors) cause the safety outputs to
be disabled within the duration of risk. The fault is reset, when the cause is eliminated and bit 7 of the request byte
changes from 1 to 0 or the safety guard is opened. Faults at the safety outputs are only deleted upon the next
release, as the fault rectification cannot be detected sooner.
Error warning
A fault that does not immediately endanger the safety function of the safety switchgear (e.g. too high ambient
temperature, safety output at external potential, cross-circuit) leads to delayed shutdown. This signal combination,
diagnostic output disabled and safety channels still enabled, can be used to stop the production process in a
controlled manner.
An error warning is deleted when the cause of error is eliminated.
If the fault warning remains on for 30 minutes, the safety outputs are also switched off (red LED flashes).
Diagnostic error (warning)
If an error (warning) is signalled in the response byte, detailed fault information can be read out.

Table 2: Function of the visual diagnostic LEDs, the serial status signals and the safety outputs by means of an example
System
conditi
on
LED's Safety
outputs
Status signals serial diagnostic byte Bit n°
green red yellow Y1, Y2 76543210
Non-
actaute
d, inputs
X1 and
X2
enabled
On Off Off 0 V 0 0 0 1 0 0 0 0
Actuate
d, safety
outputs
enabled
Off Off On 24 V 0 0 0 1 0 0 1 1
Actuate
d in limit
area
Off Off Flashes
(1Hz)
24 V 0 0 1 1 0 0 1 1
Actuate
d,
warning
Off On/flash
es
Off 24 V 0 1 0 1 0 0 1 1
Actuate
d, fault
Off On/flash
es
Off 0 V 1 1 0 1 0 0 1 0
The shown bit order of the diagnostic byte is an example. A different combination of the operational conditions will lead to a change of
the bit order.