Leuze electronic MSI-TRMB User manual

MSI-TRMB
Safety relays
SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
EN 2019/03/19 - 50128273 We reserve the right to make technical changes

Leuze electronic MSI-TRMB 2
© 2019
Leuze electronic GmbH + Co. KG
In der Braike 1
D-73277 Owen / Germany
Phone: [phone]
Fax: [phone]
http://www.leuze.com
[email protected]

Leuze electronic MSI-TRMB 3
1 About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Used symbols and signal words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended use and foreseeable misuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.2 Foreseeable misuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Competent persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Responsibility for safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Exemption of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Device connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Error display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Operating mode 1 AOPD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Operating mode 2 AOPD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Operating mode ES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Operating mode SG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5 Testing with operating mode 1 AOPD and 2 AOPDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Testing with operating mode ES and SG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7 Start/restart interlock and contactor monitoring (EDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.8 Error state FAIL SAFE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8.1 Software reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Access guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 Arrangement of the protective device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1.1 Calculating the safety distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1.2 Multi-axis arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1.3 Minimum distance to reflective surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1.4 Checklist – mounting the protective sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.1 Terminal assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8 Starting up the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.1 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.2 Start/restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.2.1 Unlocking start/restart interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
9 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1 Before the initial start-up and following modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1.1 Checklist – initial start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.2 To be performed periodically by a competent person . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.3 To be performed daily by the operating personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
9.3.1 Check list – daily or at change of shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Leuze electronic MSI-TRMB 4
10 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
11.1 What to do in case of failure? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
12 Disposing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
13 Service and support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
14 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
14.1 General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
14.2 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
15 Order guide and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
16 Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

About this document
Leuze electronic MSI-TRMB 5
1 About this document
1.1 Used symbols and signal words
Table 1.1: Warning symbols and signal words
Table 1.2: Other symbols
Table 1.3: Terms and abbreviations
Symbol indicating dangers to persons
NOTE Signal word for property damage
Indicates dangers that may result in property damage if the measures for danger
avoidance are not followed.
CAUTION Signal word for minor injuries
Indicates dangers that may result in minor injury if the measures for danger avoid-
ance are not followed.
WARNING Signal word for serious injury
Indicates dangers that may result in severe or fatal injury if the measures for danger
avoidance are not followed.
DANGER Signal word for life-threatening danger
Indicates dangers with which serious or fatal injury is imminent if the measures for
danger avoidance are not followed.
Symbol for tips
Text passages with this symbol provide you with further information.
ªSymbol for action steps
Text passages with this symbol instruct you to perform actions.
AOPD Active Optoelectronic Protective Device
Active Optoelectronic Protective Device
EDM External Device Monitoring
OSSD Output Signal Switching Device
SSD Secondary Switching Device
RES Start/REStart interlock
PFH Probability of a dangerous failure per hour
Probability of dangerous Failure per Hour
MTTF Mean time to dangerous failure
Mean Time To Failure
PL Performance Level
ES Emergency Stop
SG Safety Gate
Optical short-cir-
cuit
Short-circuit of one or more series-connected photoelectric sensors caused by opti-
cal signals

About this document
Leuze electronic MSI-TRMB 6
1.2 Checklists
The checklists (see chapter 9 "Testing") serve as a reference for the machine manufacturer or supplier.
They replace neither testing of the complete machine or system prior to the initial start-up nor their periodic
testing by a competent person. The checklists contain minimum testing requirements. Depending on the
application, other tests may be necessary.

Safety
Leuze electronic MSI-TRMB 7
2 Safety
Before using the safety relay, a risk assessment must be performed according to valid standards (e.g.
ISO 14121, ISO 12100-1, ISO 13849-1, IEC 61508, IEC 62061). The result of the risk assessment deter-
mines the required safety level of the safety relay (see table 14.1). For mounting, operating and testing,
this document as well as all applicable national and international standards, regulations, rules and direc-
tives must be observed. Relevant and supplied documents must be observed and handed to the affected
personnel.
ªBefore working with the safety relay, completely read and understand the documents applicable to your
task.
In particular, the following national and international legal regulations apply for the start-up, technical
inspections and work with safety relays:
• Machinery directive 2006/42/EC
• Low voltage directive 2014/35/EU
• Electromagnetic compatibility 2014/30/EU
• Use of work equipment directive 2009/104/EC
• OSHA 1910 Subpart 0
• Safety regulations
• Accident-prevention regulations and safety rules
• Ordinance on Industrial Safety and Health and employment protection act
• Device Safety Act
2.1 Intended use and foreseeable misuse
2.1.1 Intended use
Only if the safety relay is correctly connected and correctly started up is the protective function of the
protective device ensured. To prevent misuse and resulting dangers, the following must be observed:
• These operating instructions are included in the documentation of the system on which the protective
device is mounted and are available to the operating personnel at all times.
• The safety relay is used as follows:
• as a safety monitoring device in combination with one or more protective sensors for safeguarding
danger zones or points of operation on machines and systems.
For safety-related information you may also contact local authorities (e.g., industrial inspector-
ate, employer's liability insurance association, labor inspectorate, occupational safety and health
authority).
DANGER
Electrically live systems pose a risk of electric shock!
ªDuring all conversions, maintenance work and inspections, make certain that the voltage supply is
interrupted and protected against being restarted again.
ªOnly have work on the electrical system and electronics performed by a competent person.
ªMake certain that the safety relay is installed in a switch cabinet or housing (IP54 or higher).
WARNING
A running machine may result in serious injury!
ªMake certain that the safety relay is correctly connected and that the protective function of the protec-
tive device is ensured.
ªMake certain that, during all conversions, maintenance work and inspections, the system is securely
shut down and protected against being restarted.

Safety
Leuze electronic MSI-TRMB 8
• as a safety sequential device for 2-channel E-Stop and safety door monitoring.
• The safety relay must only be used after it has been selected in accordance with the respectively
applicable instructions and relevant standards, rules and regulations regarding labor protection and
safety at work, and after it has been installed, connected, checked and commissioned by a compe-
tent person.
• The safety relay must only be connected and commissioned in accordance with its specifications
(technical data, environmental conditions, etc.).
• The “Reset” acknowledgment button for unlocking the start/restart interlock must be located outside
of the danger zone.
• The entire danger zone must be visible from the installation site of the acknowledgment button.
• The safety relay must be selected so that its safety-related capability meets or exceeds the required
Performance Level PL ascertained in the risk assessment (see table 14.1).
• The machine or system control must be electrically influenceable so that a switch command sent by
the safety relay results in the immediate shutdown of the dangerous movement.
• The construction of the safety relay must not be altered. When manipulating the safety relay, the pro-
tective function is no longer guaranteed. Manipulating the safety relay also voids all warranty claims
against the manufacturer of the safety relay.
• The safety relay must be tested by a qualified person at regular intervals, i.e. at least every 6 months
or during regular maintenance of the machine.
• The safety relay must be exchanged after a maximum of 20 years. Repairs or the exchange of wear
parts do not extend the mission time.
2.1.2 Foreseeable misuse
Any use other than that defined under the “Approved purpose” or which goes beyond that use is consid-
ered improper use.
Alone, the safety relay is not a complete protective device. It is not suitable for use in the following cases:
• in explosive or easily flammable atmospheres.
• on machines or systems with long stopping times.
2.2 Competent persons
Prerequisites for competent persons:
• They have a suitable technical education.
• They know the rules and regulations for labor protection, safety at work and safety technology and
can assess the safety of the machine.
• They know the instructions for the safety relay and the machine.
• They have been instructed by the responsible person on the mounting and operation of the machine
and of the safety relay.
2.3 Responsibility for safety
Manufacturer and operating company must ensure that the machine and implemented safety relay func-
tion properly and that all affected persons are adequately informed and trained.
The type and content of all imparted information must not lead to unsafe actions by users.
The manufacturer of the machine is responsible for:
• Safe machine construction.
• Safe implementation of the safety relay.
• Imparting all relevant information to the operating company.
• Adhering to all regulations and directives for the safe starting-up of the machine.

Safety
Leuze electronic MSI-TRMB 9
The operator of the machine is responsible for:
• Instructing the operating personnel.
• Maintaining the safe operation of the machine.
• Adhering to all regulations and directives for labor protection and safety at work.
• Regular testing by competent persons.
2.4 Exemption of liability
Leuze electronic GmbH + Co. KG is not liable in the following cases:
• Safety relay is not used as intended.
• Safety notices are not adhered to.
• Reasonably foreseeable misuse is not taken into account.
• Mounting and electrical connection are not properly performed.
• Proper function is not tested (see chapter 9 "Testing").
• Changes (e.g., constructional) are made to the safety relay.

Device description
Leuze electronic MSI-TRMB 10
3Device description
The MSI-TRMB safety relays can be used as follows:
• Safety monitoring devices for electro-sensitive protective equipment (ESPE) on machines which
pose a risk of injury (according to IEC 61496-1),
• Safety sequential device for 2-channel E-Stop monitoring, safety sequential device for 2-channel
safety door monitoring.
As part of the electrical equipment, they enable machines or systems to achieve a safe state before
persons can be endangered.
The safety relay is intended for DIN rail mounting and is wired via 16 terminals. It must be installed in a
housing or switch cabinet (IP54 or higher).
The complete safety system consists of a safety relay and safety sensors connected to it.
a Reset / device reset (if software reset using start button as described under 4.8 is not desired)
b Active
c Transmitter
d Receiver
e Start application see chapter 4.1 "Operating mode 1 AOPD", (here: operation with start/restart inter-
lock)
f Operating mode: safety monitoring device with one or more protective sensors connected in series
g EDM (contactor monitoring / external device monitoring circuit)
h OSSD safety switching output (cross-circuit protection of both outputs by means of polarity reversal
to i)
i OSSD safety switching output (cross-circuit protection of both outputs by means of polarity reversal
to h)
j “Error”
Figure 3.1: Structure of the complete safety system
0V
Var. B
Var. A
+24V
St at e
Err or
MSI-TRMB
active
Receiver
0V + 24V
Betriebsart
-K1
-K2
-A3
6
S11 S22 S12 S36 S35
S31 14 24
13 23S21
-K2-K1
-K1
-K2
A1
A2
-K1 A1
A2
-K2
1
2
1
2
44
3
-A2 1A1
0V
+24V
PE
L- L+
+ 24V
0V
PE
L+ L-
3
1
Transmitter
-A1
a
b
dc
f e
g i
i
h
h
j
+24V
0V
Reset
Start
Start-
Applikation:
Überwachter
Start

Device description
Leuze electronic MSI-TRMB 11
3.1 Device connection
Figure 3.2: MSI-TRMB
3.2 Display elements
The display elements of the safety relay simplify start-up and fault analysis.
1“OUT1”
2“OUT2”
3“IN1”
4“IN2”
5“PWR”
6“Fault”
Figure 3.3: Display elements of the MSI-TRMB
Table 3.1: Meaning of the LEDs
S11 S12 S21 S22
S31 S32 S33 S34
A1 S35 S36 A2
13 14 23 24
OUT1 IN1 PWR
OUT2 IN2 Fault
13 14 23 24
MSI-TRMB
LED 1, 3, 5
LED 2, 4, 6
S11 S12 S21 S22
S31 S32 S33 S34
A1 S35 S36 A2
13 14 23 24
OUT1 IN1 PWR
OUT2 IN2 Fault
13 14 23 24
MSI-TRMB
LED Color Description
OUT1 Green Channel 1 relay actuated
OUT2 Green Channel 2 relay actuated
OUT1 and OUT2 Green, flashing Optical short-circuit in the case of ESPE applica-
tions
IN1 Yellow Input 1 active
IN2 Yellow Input 2 active
IN1 and IN2 Yellow flashing Single-channel switch-off – waiting for second
channel (in the case of E-Stop/safety door applica-
tion)

Device description
Leuze electronic MSI-TRMB 12
3.3 Error display
Table 3.2: Error display via LEDs
PWR Green Power on
PWR Green, flashing Supply voltage not correct (see chapter 14.1 "Gen-
eral specifications")
Fault Red Internal or external fault (see chapter 3.3 "Error
display")
LED Color Description
LED indicator Errors and possible causes Remedial measures
Fault IN1, IN2 OUT1, OUT2
On Flashing Off Start button / bridge is (with
automatic, non-monitored
start) not connected to S21
Disconnect device from
power supply, check for wir-
ing faults, replace device if
defective
Change of start condition
during operation
On Off Flashing
alternately
Output S11/S21 short-circuit
to GND
Disconnect device from
power supply, check wiring,
replace device if defective or
check connected ESPE
Output S11/S21 short-circuit
to VCC
Incorrect input signals, incor-
rect operating mode
Reaction time of ESPE is
longer than 8.5 ms
Cross-circuit between S11
and S21 or S12 and S22
Short-circuit of triggering ele-
ments in the case of ESPE
applications
On Off Flashing Error during relay test –
internal relay defective /
fused together
Disconnect device from
power supply, check con-
nections at relay contacts,
check max. output capability
(see chapter 14.1 "General
specifications"), replace
device if defective

Device description
Leuze electronic MSI-TRMB 13
On Flashing
alternately
Off With E-Stop/protective door
application: When switching
on power supply, signals at
S12 and S22 have different
values
Disconnect device from
power supply, check for wir-
ing faults, replace device if
defective or check con-
nected ESPE
Problems with detection of
operating mode:
Signal at S32 cannot be
clearly allocated
Problems with detection of
operating mode:
Bridge / signal at S12 cannot
be clearly allocated
Application - connection of
ESPE: Bridge S21-S12 was
removed during operation
Wiring at S32 was changed
during operation or S32 has
short-circuited to VCC/GND
during operation
On Flashing
alternately
Flashing
alternately
Optical short-circuit existed
during teach-in and was
removed later
Disconnect device from
power supply, check wiring
and connected ESPE
LED indicator Errors and possible causes Remedial measures
Fault IN1, IN2 OUT1, OUT2

Functions
Leuze electronic MSI-TRMB 14
4 Functions
After the safety relay is switched on, the device performs a self test. During this test, the operating mode
in which the safety relay is to function is determined on the basis of the wiring. The basic wiring configu-
rations of the individual operating modes are given below.
4.1 Operating mode 1 AOPD
Safety monitoring device with one or more protective sensors connected in series used for safeguarding
danger zones or points of operation on machines and systems.
AOPD = one or more protective sensors connected in series
Figure 4.1: Basic wiring for operating mode 1 AOPD (one protective sensor)
4.2 Operating mode 2 AOPD
Safety monitoring device with two protective sensors or two series connections consisting of multiple
protective sensors used for safeguarding danger zones or points of operation on machines and systems.
AOPD = one or more protective sensors connected in series
Figure 4.2: Basic wiring for operating mode 2 AOPDs (two protective sensors)
4.3 Operating mode ES
Safety sequential device for 2-channel E-Stop monitoring with NC contacts.
ES = mechanical E-Stop switch (2-channel)
Figure 4.3: Basic wiring of operating mode ES (E-Stop)
If protective sensors are linked together in the way shown in the connection examples (see
figure 7.3 and see figure 7.4), the total delay time (0.5 ms to 8.5 ms) should be noted.
AOPD
S11 S12 S21 S22 S32
If protective sensors are linked together in the way shown in the connection examples (see
figure 7.7 and see figure 7.8), the total delay time (0.5 ms to 8.5 ms) should be noted.
AOPD AOPD
S11 S12 S21 S22 S32
Automatic start is not approved for E-Stop applications.
ES
S11 S12 S21 S22 S32
ES

Functions
Leuze electronic MSI-TRMB 15
4.4 Operating mode SG
Safety sequential device for 2-channel safety door monitoring.
SG = mechanical safety door switch (2-channel)
Figure 4.4: Basic wiring for operating mode SG (safety door)
4.5 Testing with operating mode 1 AOPD and 2 AOPDs
The protective sensors (AOPDs) are monitored for
• Short-circuit with operating voltage (Vcc or GND)
• Electrical cross-circuit
• Optical cross-circuit or short-circuit
For this purpose, control outputs S11 and (after a delay) S21 are clocked.
4.6 Testing with operating mode ES and SG
The E-Stop and safety door switch is monitored for
• Short-circuit with operating voltage (Vcc or GND)
• Electrical cross-circuit
For this purpose, control outputs S11 and (after a delay) S21 are clocked as shown in the diagram below:
a Test signal of MSI-TRMB at S11 and S21
Figure 4.5: Diagram showing clocking of control outputs S11 and S21
4.7 Start/restart interlock and contactor monitoring (EDM)
The start/restart interlock prevents automatic start-up of the system (e.g. if the protective field is again clear
or if an interruption in the voltage supply is restored). The operating personnel must make certain that no
people are present in the danger zone before the system is manually re-enabled.
The restart interlock is configured via the wiring.
The safety door monitoring switches must be closed so that the safety switching outputs (OSSD)
can close.
SG
S11 S12 S21 S22 S32
SG
The total delay time for a linked series of photoelectric sensors must be in the range from 0.5 ms
to 6.5 ms.
a
1 ms 200 ms

Functions
Leuze electronic MSI-TRMB 16
Figure 4.6: Start/restart interlock and contactor monitoring (EDM)
Figure 4.7: Automatic start with EDM
A feedback contact of an external contact extension (Kext) can be connected in series with the start button.
Changing between the two start configurations is not allowed during operation. If a change is detected, the
device enters the error state and indicates this via the LEDs (see chapter 3.3 "Error display"). The specific
wiring of the external relays is shown in the application examples (see figure 7.1 – see figure 7.11). With
a monitored start, the device reacts to the falling edge of the start button; with a non-monitored start, it
reacts to the rising edge or the static signal.
4.8 Error state FAIL SAFE
If the device is in an error state (FAIL SAFE), this is indicated by the LEDs (see chapter 3.3 "Error display").
In the error state, the OSSD safety switching outputs (relay outputs) and control outputs S11 and S21 are
switched off. The device no longer reacts to input actuation, e.g. pressing of the start button.
The error state can be reset by means of a software reset (see chapter 4.8.1 "Software reset") or by briefly
switching off the voltage supply at A1, e.g. using a reset button connected in series to the supply voltage
at A1.
4.8.1 Software reset
If the safety relay indicates a fault, it can be reset as follows:
• With monitored start: press the start button for at least 4 s.
• Between S35 and S36: press a button connected for the reset, for at least 4 s.
NOTICE
Operation of the device in the E-Stop application with automatic start (without restart interlock) is not
allowed.
NOTICE
With monitored start, Kext. must be connected between the start button and S35.
Start
S36 S35
K
ext
Start
S33 S34
K
ext

Applications
Leuze electronic MSI-TRMB 17
5 Applications
5.1 Access guarding
Safety relays are used together with single- or multiple light beam safety devices, e.g. as access guarding
for danger zones. Because protective sensors only detect persons upon entry into the danger zone, and
not whether a person is present in the danger zone, the safety relay only triggers the switch command
upon entry of a person into a danger zone. Access guarding may therefore only be operated with activated
start/restart interlock or additional safety measures must be taken.
Figure 5.1: Intervention control on packaging machinery

Applications
Leuze electronic MSI-TRMB 18
Figure 5.2: Access guarding / intervention control on sawing machines
Figure 5.3: Foot-space protection on side-tracking shelves

Mounting
Leuze electronic MSI-TRMB 19
6 Mounting
The safety relay is intended for mounting on a DIN rail in the switch cabinet.
Prerequisites for mounting:
• Switch cabinet with appropriate degree of protection (at least IP54).
• Sufficient space on the DIN rail.
• Arrangement of the protective device acc. to ISO 13855 see chapter 6.1 "Arrangement of the protec-
tive device".
ªSnap the safety relay onto the DIN rail.
The safety relay can be connected to the protective sensor.
6.1 Arrangement of the protective device
Optical protective devices can only perform their protective function if they are mounted with adequate
safety distance. When mounting, all delay times must be taken into account, e.g. the response times of
the protective sensor and control elements as well as the stopping time of the machine.
The following standards specify calculation formulas:
• ISO 13855, "The positioning of protective devices in respect of approach speeds of parts of the
human body": mounting situation and safety distances.
• IEC 61496-2, "Active optoelectronic protective devices": distance of the reflecting surfaces/deflecting
mirrors.
Table 6.1: Beam heights and distances
6.1.1 Calculating the safety distance
General formula for calculating the safety distance S of an Optoelectronic Protective Device acc. to
ISO 13855:
S [mm] = Safety distance
K [mm/s] = 1600 mm/s (approach speed for access guarding)
T [s] = Total time of the delay
C [mm] = 850 mm (default value for arm length)
ªCalculate safety distance S for access guarding using the formula acc. to ISO 13855:
WARNING
Improper mounting may result in serious injury!
The protective function of the safety relay is only ensured if appropriately and professionally mounted for
the respective, intended area of application.
ªOnly allow competent persons to install the safety relay.
ªObserve the relevant standards, regulations and these instructions.
Number of beams/beam distance [mm] Beam heights in accordance with ISO 13855 [mm]
2 / 500 400, 900
3 / 400 300, 700, 1100
4 / 300 300, 600, 900, 1200
SKTC+=

Mounting
Leuze electronic MSI-TRMB 20
S [mm] = Safety distance
ta[s] = Response time of the protective device
ti[s] = Response time of the safety relay
tm[s] = Machine stopping time
6.1.2 Multi-axis arrangement
With multi-axis installation, the light beams must run parallel to the reference plane (e.g. floor) and must
be aligned mutually parallel.
When mounting multiple protective sensors, no transmitter may be directed any receiver within the series
connection other than that which is intended. Note that the operating ranges of photoelectric sensors may
be larger than the specified maximum ranges. Correct mounting of the protective sensors must be checked
by means of tests and secured against misalignment.
a Transmitter
b Receiver
Figure 6.1: Multi-axis arrangement
6.1.3 Minimum distance to reflective surfaces
a Required minimum distance to reflective surfaces [mm]
b Protective field width [m]
c Reflective surface
Figure 6.2: Minimum distance to reflective surfaces depending on protective field width
If longer stopping times are determined during regular inspections, an appropriate additional time
must be added to tm.
S 1600 mm tatitm ++850 mm+=
a
a
a
b
b
b
WARNING
Failure to maintain minimum distances to reflective surfaces may result in serious injury!
Reflective surfaces can indirectly deflect the transmitter beams to the receiver. In this case, interruption
of the protective field is not detected.
ªMake certain that all reflective surfaces are the necessary minimum distance away from the protective
field.
a
b
4° 4°
c