bihl+Wiedemann BWU2236 User manual

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
User Manual
Revision date: 2011-05-30
...supports the requirements for AS-i Safety up to SIL3

Subject to modifications without notice.
Generally, this manual refers to products
without mentioning existing patents,
utility models, or trademarks.
The absence of any such references does
not indicate that a product is patent-free.
© Bihl+Wiedemann GmbH
Flosswoerthstr. 41
D-68199 Mannheim

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Table of Contents
Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH 3
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
Issue date: 30.5.2011
Table of Contents
AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
EC Declaration of Conformity
1 Symbol Catalog ....................................................................................6
1.1 Abbreviations ................................................................................................... 6
2 General Remarks ..................................................................................7
2.1 Product information......................................................................................... 7
2.2 Function of this manual .................................................................................. 7
2.3 Target group..................................................................................................... 7
2.4 AS-i specifikation 3.0....................................................................................... 7
3 Safety.....................................................................................................8
3.1 Experienced staff ............................................................................................. 8
3.2 Application area of the device ........................................................................ 8
3.3 Correct use ....................................................................................................... 9
3.3.1 Disposal ........................................................................................................................... 9
4 Product Description ........................................................................... 10
4.1 AS-i Safety at Work........................................................................................ 10
4.1.1 Special characteristics of the AS-i Safety Output...................................................... 10
4.2 Technical data ................................................................................................ 11
4.3 Safety relevant data ....................................................................................... 12
4.3.1 Overwiev of the safe input parameter ......................................................................... 12
4.3.2 Overwiev of the safe output parameter....................................................................... 13
4.4 Electrical connection ..................................................................................... 14
4.5 Operating interface ........................................................................................ 15
4.6 LEDs................................................................................................................ 16
5 Maintenance........................................................................................ 17
5.1 Controlling safe shutdowns.......................................................................... 17
6 Address Assignment.......................................................................... 18
6.1 Programming the AS-i address of the safety output .................................. 18

Issue date: 30.5.2011
4Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Table of Contents
6.2 Programming the AS-i address of the safety input slave........................... 19
6.3 Programming of the AS-i address of the diagnostics slave
(AB Address) ............................................................................................ 19
7 Safety Requirements ......................................................................... 20
7.1 Requirements for use in a Safety Category 4 environment ....................... 20
7.2 Recommendation for improved availability of the function....................... 20

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
EC Declaration of Conformity
Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH 5
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
Issue date: 30.5.2011
EC Declaration of Conf ormity

Issue date: 30.5.2011
6Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Symbol Catalog
1. Symbol Catalog
1.1 Abbreviations
Information!
This symbol indicates important information.
Attention!
This symbol warns of a potential failure. Non-compliance may lead to interruptions of
the device, the connected peripheral systems, or plant, potentially leading to total mal-
functioning.
Warning!
This symbol warns of an imminent danger. Non-compliance may lead to personal inju-
ries that could be fatal or result in material damages and destruction.
AS-i AS-interface (actuator sensor interface)
AOPD Active opto-electronic protective device
CRC Cyclic redundancy check
I/O Input/output
EDM External device monitoring
EMC Electromagnetic compliance
ESD Electrostatic discharge
PELV Protective extra-low voltage
PFD Probability of failure on demand
PLC Programmable logic control
SaW Safety at Work, safety technic

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
General Remarks
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Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
Issue date: 30.5.2011
2. General Remarks
Please read this chapter carefully before working with the documentation and the
"AS-i Safety Relay Output Module with Diagnostic Slave".
2.1 Product information
This user manual is valid for the following Bihl+Wiedemann GmbH devices:
2.2 Function of this manual
This manual instructs for the safe assembly, electrical installation, addressing,
start-up as well as for the operation and for the maintenance of the AS-i Safety
Relay Output.
This manual does not provide instructions for operating machines, on which this
module is built in. Please view the appropriate machine manual for corresponding
information.
2.3 Target group
This manual is intended for designers, developers and operators of systems that
will be safeguarded by one or more AS-i Safety Relay Outputs. The manual is
also targeted to people integrating AS-i Safety Relay Outputs into machinery, per-
forming the initial start-up, or maintaining them.
2.4 AS-i specifikation 3.0
The "AS-i Safety Relay Output Module with Diagnostic Slave" is designed ac-
cording to the AS-i specification 3.0.
Earlier specifications (2.1 and 2.0) continue to be fully supported.
AS-i Safety Relay Output Module with Diagnos-
tic Slave
BWU2236
for all special versions, derived from the basic "AS-i Safety Relay Output Module with Diagnostic Slave".
Information!
Additional information concerning the technical data as well as the parameterization of
the AS-i Safety Relay Output can be found in data sheet BWU2236 that can be loca-
ted at http://www.bihl-wiedemann.de.

Issue date: 30.5.2011
8Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Safety
3. Safety
This chapter contains user safety information.
3.1 Experienced staff
The AS-i Safety Relay Output Module with Diagnostic Slave must only be in-
stalled, operated, and maintained by qualified staff.
Qualified is a person who
• has a suitable technical education
• has been instructed in operating the machinery and has been informed about
the valid safety guidelines by the machinery operator
• has access to the user manual.
3.2 Application area of the device
The module BWU2236 is a decentralized output-module that safely controls ac-
tuators on the AS-i Safety at Work (SaW) safety bus system.
In this set-up, a Safety Monitor or a Gateway with integrated Safety Monitor, re-
spectively, controls the BWU2236.
A special characteristic of this module is its three different kinds of AS-i address-
es:
• safety output
BWU2236 listens to the communication on the safe address and switches
based on these data.
• safety input slave
One safety input slave which monitors the two contacts S1 and S2.
• diagnostic slave
The standard AS-i slave (AB slave) is used for diagnostic purposes and for
switching under normal operating conditions.
All SaW output modules with the same safe AS-I address switch at the same
time.
The module BWU2236 is certified according to EN 62 061, SIL 3, and
EN 13 849, performance level "e".
Warning!
Please read this chapter carefully before using the AS-i Safety Relay Output in combi-
nation with other machine safeguarding components on protected machinery.
Attention!
For protective operation of the module the switches must be in the ON/RUN position.

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Safety
Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH 9
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
Issue date: 30.5.2011
3.3 Correct use
The AS-i Safety Relay Output Module with Diagnostic Slave must only be used
as defined in chap. Application area of the device. The AS-i Safety Relay Output
Module with Diagnostic Slave must only be used on the system, at which it was
installed in accordance with this manual by adept personnel.
3.3.1 Disposal
Information!
If used in a way differing from this description or if the device has been changed in any
way – even during installation – any warranty claims with respect to Bihl+Wiedemann
GmbH are invalid.
Information!
Electronic waste is hazardous waste. Please comply with all local ordinances when
disposing this product!
The device does not contain batteries that need to be removed before disposing it.

Issue date: 30.5.2011
10 Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
4. Product Description
This chapter is intended to inform the reader about the special characteristics of
the AS-i Safety Relay Output Module with Diagnostic Slave. It describes the de-
sign and the functionality of the devices.
4.1 AS-i Safety at Work
AS-i Safety at Work combines safe and non-safe data on a bus system. The clas-
sification AS-i Safety at Work identifies the safe data transfer that enables the in-
tegration of safety procedures in an AS-i network.
The components of AS-i Safety at Work conform to EN 50295 and are compatible
with all other AS-i components. Therefore, existing AS-i applications can easily
be extended with safety-relevant functions.
AS-i Safety at Work always requires a Safety Monitor (as a stand-alone device or
integrated into a Gateway), that evaluates the safe signals on the bus, and a safe
AS-Interface bus connection, that enables the transfer of safe signals from safe-
ty-relevant components (AS-i SaW input).
Additionally, decentralized safe AS-I SaW outputs can be added. Controlled by
the Safety Monitor these outputs can be used to safely switch off safe actuators.
Several Safety Monitors and safe input and output slaves can be used on an
AS-i system. At the same time, the Safety Monitors can be parameterized and,
thus, be checked through AS-i and the configuration software.
In order to satisfy the requirements of these safety categories, all peripheral com-
ponents, for instance the Safety Monitors, all safe bus connections, and all con-
nected sensors must satisfy these standards.
4.1.1 Special characteristics of the AS-i Safety Output
• 2 series connected positive-opening relays
• 2 parallel connected galvanically isolated contacts sets
• Connection option for 2 safety potential-free contacts. The contacts are mon-
itored for cross-connections
• Inputs supplied by 24 V auxiliary voltage
• Programming jack
• 2 switches for mode selection
Warning!
This chapter must be read before installation and operation of the device in conjunction
with other safety components on protected machinery.
Information!
By utilizing AS-i Safety at Work safety requirements up to category 4 according to
EN 954-1 and additionally performance level "e" according to EN 13 849 as well as SIL
3 according to EN 62 061 can be satisfied.

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH 11
Internet: www.bihl-wiedemann.de • Flosswoerthstr. 41 • D-68199 Mannheim phone: [phone] • fax: [phone]
Issue date: 30.5.2011
4.2 Technical data
Article no. BWU2236
Tab. 4-1.
Inputs 1 EDM, diagnostic,
2 / 1 safety inputs (Cat. 4/SIL 3)
Outputs 1 relay
3 A, 24 V, DC-13 or 3 A, 230 V, AC-15
Max. resistance
betweenS11-S12;S21-S22
150 Ohm
AS-i profile diagnostic AB slave S-7.A.E
ID1 Code diagnostic AB slave 5hex (default), value modifiable
AS-i profile safety input S-7.B.0
ID1 Code safety input Fhex (default), value modifiable
External device monitoring (EDM) reference potential over I+, I-
Indicators
2 x LED yellow (S 1, S 2) state of safety inputs
(S11-S12,S21-S22)
1 x LED yellow (R) release status
1 x LED yellow (1.Y1) state of EDM input 1.Y1
LED green (PWR) AS-i voltage ON
LED red (FAULT) AS-i Fault
LED yellow (OUT) for definition see table "device colors"
LED red (ALARM) PLC inidicates alarm
Current input out of AS-i < 200 mA
Operating voltage AS-i (30 VDC)
AUXext. in voltage supply 24 VDC (± 20%)
Voltage of insulation
(relay contact for AS-i resp. AUXext. in)
t6kV
Current input out of AUX ext. in <30mA
Voltage of insulation AS-i to AUXext. in t500 V
Current capacity max. I+ max. 100 mA
Applied standards EN 954-1 Cat 4
IEC61508SIL3
EN 13 849-1/PLe Cat 4
EN IEC 62 061 SIL 3
Housing din-rail mounting
Ambient operating temperature 0°C ... +55 °C
Storage temperature -25°C ... +85 °C
Dimensions (L / W / H in mm) 114 / 22,5 / 99
Protection class DIN EN 60 529 IP20 (only for use in electrical service
rooms / cabinets with minimum IP54
protection suitable)

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AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
4.3 Safety relevant data
4.3.1 Overwiev of the safe input parameter
Diagnostic (device colors)
Value color description state change LED "Out"
0 green output on on
1 green flashing – –
2 yellow restart inhibit auxillary signal 2 1 Hz
3 yellow flashing – –
4 red output off off
5 red flashing waiting for "reset of error condition" auxillary signal 1 8 Hz
6 grey internal error, such as "fatal error" only via "Power On" on device all LEDs flashing
7 green/yellow output released, but not switched on switching-on by setting of A1 off
Tab. 4-2.
Identification data value standard
Safety category 4 EN 954-1
Safety category 4 EN 13849-1:2006/PLe Cat 4
Performance level (PL) e
Safety Integrity Level (SIL) 3 IEC 61 508
Usage time (TM) in years 20 EN 13849-1:2006/PLe Cat 4
Max. power-on time in months 12 IEC 61 508
Tab. 4-3.
Identification data Value Standard
Turn-off time 11 ms IEC 61 508
Tab. 4-4.
Fault rate Standard
MTTFd= 156 years (~ high) EN ISO 13849-1:2008
PFHD= 5,94 * 10-9 1/h EN 62061:2005
PFH = 3,30 * 10-9 1/h; PFD = 4,55 * 10-6 (by T1= 1 year) EN 61508:2001
Tab. 4-5.

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
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Issue date: 30.5.2011
4.3.2 Overwiev of the safe output parameter
Identification data Value Standard
Turn-off time 50 ms IEC 61 508
Tab. 4-6.
Switching intervals
tcycle [s]
electronics
MTTFd[years]
electromechanics
MTTFd[years]
total
MTTFdG [years]
standard
60 156 15 13,6 EN ISO 13849-1:
2008
600 148 75,9
3600 890 132,7
electronics
PFH [1 / h]
electromechanics
PFH [1 / h]
PFHtotal [1 / h]
60 5,94 * 10-9 1,98 * 10-7 2,05 * 10-7 EN 62061:2005
600 3,88 * 10-9 1,50 * 10-8
3600 1,27 * 10-9 7,61 * 10-9
electronics
PFH [1 / h]
electromechanics
PFH [1 / h]
PFHtotal [1 / h]
60 3,30 * 10-9 3,89 * 10-8 4,25 * 10-8 EN 61508:2001
600 3,88 * 10-9 7,54 * 10-9
3600 6,47 * 10-10 4,30 * 10-9
Tab. 4-7.

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AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
4.4 Electrical connection
Clamps description
S11, S12, S21, S22 safety input clamps
1.13, 1.14 safety output contact set 1
1.23, 1.24 safety output contact set 2
I- ext.out
I+ext.out
reference potential for EDM-/start input (1.Y1)
1.Y1 EDM / start input
AS-i+, AS-i– AS-i network connection
AUX+ext.in
AUX -ext.in
voltage supply for safety input (24 VDC ext.)
Tab. 4-8.
S1R
1.Y1S2
S 12
S
11
1.13
ASI
+
S 22
S 21
1.14
ASI
–
I –
ext out
NC
ext.In
1.23
AUX+
I +
ext.out
1.Y1
ext.In
1.24
AUX-
ADDR
RUN
ON
PRG
SEL
FAULT ALARM
PWR OUT
+
N
K2
K1
L1 L2 L3
Motor
1.Y1
1.141.13
I+
L
ASI
–+–
AUX
(24 VDC)
Attention!
The AS-I power supply for the AS-I components must have isolation per IEC 60 742
and be able to handle momentary power interruptions of up to 20 ms. The power sup-
ply for the 24 V supply must also have isolation per IEC 60 742 and be able to handle
momentary power interruptions of up to 20 ms. The maximum output voltage of the
power supply must also be less than 42 V in case of a fault.

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
Subject to technical modififications; no responsibility is accepted for the accuracy of this information © Bihl+Wiedemann GmbH 15
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Issue date: 30.5.2011
4.5 Operating interface
Switches to select the operational mode:
Normal operationing state
addressing: safety slave (single address)
addressing: safety input slave (single address)
addressing: diagnostic slave (AB address)
Addressing jack (ADDR)
S1R
1.Y1S2
S 12
S11
1.13
ASI +
S 22
S 21
1.14
ASI –
I–
ext out
NC
ext.In
1.23
AUX+
I+
ext.out
1.Y1
ext.In
1.24
AUX-
ADDR
RUN
ON
PRG
SEL
FAULT ALARM
PWR OUT
SEL
PRG
ON
RUN
SEL
PRG
ON
RUN
SEL
PRG
ON
RUN
SEL
PRG
ON
RUN

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AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Product Description
4.6 LEDs
LEDs Status Signal // Description
PWR green No supply power
1Hz
Supply power is on, safety-relevant address and/or AS-i AB address is “0” or no 24 V
ext. in (auxiliary power)
Supply power on
FAULT red AS-i communication OK
no 24 V ext. in (auxiliary power)
no data exchange with the AB slave and/or safety-related AS-i address
OUT yellow Output relay switched off
1Hz
Error lock state, waiting for start signal, after transmission of start signal Output Relay
switches on
8Hz
The device is in an un-lockable error state. The devices resumes regular operation after
the Monitor sent the signal “error unlock”.
Output Relay switched on
ALARM red AS-i output bit O 0 is not set
AS-i output bit O 0 is set
S1, S2,
1.Y1
yellow Corresponding input not switched on
Corresponding input switched
S1, S2 cross-connection at the safety inputs
Rrelease not issued
release issued
S1, S2, R,
1.Y1
(running light)Switch is set to ON/PRG
FAULT,
OUT
(alternating)
Periphery fault
LED LED flashing LED off
Tab. 4-9.

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Maintenance
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5. Maintenance
5.1 Controlling safe shutdowns
The plant safety engineer is responsible for verifying that the AS-i Safety Relay
Output Module with Diagnostic Slave works correctly as part of the safety system.
At least once a year it is necessary to verify the safe shutdown by initiating asso-
ciated safety-related sensors or switchs:
Attention!
Press each safety-related AS-i slave and watch the reaction of the output circuits of the
AS-i Safety Monitor.
Attention!
Check the maximum activated time and the total operating time. These values depend
on the PFD value chosen for the total failure probability. Please refer to the information
in chap. Safety relevant data.
After reaching the projected maximum operating time (three, six, or twelve months) the
entire safety system must be checked for proper operation.
After reaching the projected total usage time (20 years) the device must be checked by
the manufacturer concerning its proper operation.

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AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Address Assignment
6. Address Assignment
The device offers three different types of AS-i addresses:
6.1 Programming the AS-i address of the safety output
2. Set desired address by using the hand-held addressing device or AS-i Mas-
ter.
3. Check programmed address by using the hand-held addressing device or
AS-i Master.
4. Check slave’s ID code by using the hand-held addressing device or AS-i
Master. The code should be set to “F”.
5. Check slave’s ID1 code by using the hand-held addressing device or AS-i
Master. Code should be the same as the tens-digit of the address.
Safety output
BWU2236 monitors communication on the safety address and switches based on the
monitored data.
This address can only be programmed if the switches are set to ON /
PRG.
SEL
PRG
ON
RUN
Information!
The address must be tested as described in Section Programming the AS-i address of
the safety output.
Safety input slave
One safety input slave which monitors the two contacts S1 and S2.
This address can only be programmed if the switches are set to SEL /
PRG.
Diagnostic slave
One standard-AS-i-Slave (AB-Slave) for diagnostics and switching under normal
operating conditions.
This address can only be programmed if the switches are set to SEL /
RUN.
SEL
PRG
ON
RUN
SEL
PRG
ON
RUN
Basic position
Programming and monitoring of the address of the safety output is done
as described here:
1. Set the switches of the device to ON/PRG.
SEL
PRG
ON
RUN
SEL
PRG
ON
RUN

AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Address Assignment
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6. Check slave’s ID2 code by using the hand-held addressing device or AS-i
Master. The code should be the same as the ones-digit of the address.
7. Check slave’s IO code by using the hand-held addressing device or AS-i
Master. The code should be “7”.
6.2 Programming the AS-i address of the safety input slave
2. The desired address can be programmed by using the hand-held address-
ing device or AS-i Master.
6.3 Programming of the AS-i address of the diagnostics slave
(AB Address)
2. The desired AB address can be programmed by using the hand-held
addressing device or AS-i Master.
Warning!
The correct safety function of the device must be verified once installed within the pro-
tected machinery!
Programming of the safety address (safety input slave):
1. Set the swiches of the device to SEL / PRG.
SEL
PRG
ON
RUN
Programming of the AS-i address of the diagnostics slave (AB address):
1. Set the swiches of the device to SEL / RUN.
SEL
PRG
ON
RUN

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AS-i Safety Relay Output Module with Diagnostic Slave
1 EDM- and 2/1 safety inputs
Safety Requirements
7. Safety Requirements
• The device uses two redundant, force-guided relays.
• The module recognizes if one of the relays does not switch (for instance if the
contacts are welded).
• The contact sets 1.13/1.23 and 1.14/1.24 use the same relay; they do not
operate independently.
• The contacts 1.13, 1.23, 1.14, 1.24 are potential-free. A cross-short check is
not available.
• If the device is set up to control two independent safety contactors, the con-
nection between the safety contactors and the device must never be sub-
jected to another potential as this could result in the inadvertent activation of
the safety contactors.
• Input 1.Y1 is a standard AS-i input.
• The external 24 V supply must be provided by a PELV power supply.
• Normally open switches must be connected to S1 and S2
7.1 Requirements for use in a Safety Category 4 environment
Safe turn-off must be checked at regular intervals (a recommended value is
3 months).
Use of a mechanically positive-opening switch together with a protected cable
routing requires no cyclical test of the input functionality according to EN 954-1,
cat. 4.
7.2 Recommendation for improved availability of the function
The switching contacts should be turned off for at least 41 ms, since the safety
monitor (depending on the set monitoring component) must recognize the INPUT
OFF for a minimum number of AS-i telegrams. IF the minimum off time of 41 ms
(depending on the number of slaves on the AS-i bus and the set monitoring com-
ponent) is maintained, correct recognition of the input state is assured. Non-ob-
servance of this time may limit the availability of the AS-i Safety Monitor as fol-
lows:
• A setting of TWO-CHANNEL POSITIVE OPENING can cause the Safety
Monitor to go into the error state; to eliminate the error state, the supply volt-
age for the Safety Monitor must be disconnected.
• A setting of TWO-CHANNEL DEPENDENT means the Safety Monitor allows
release only after a sufficient off-time; the release can be achieved if the
switching contacts are turned off for at least 41 ms .