Bosch Rexroth 4WRPD User manual

Operating instructions
RE 29391-B/05.2021
Replaces: 08.2020
English
High-response/proportional
valves with Multi-Ethernet
interface
4WRPD(H)
4WRPQ(H)
4WRPF(H)
4WRLD
4WRLF
4WRLQ
5WRPF10
5WRPQ10

The data specified only serve to describe
the product. If information on the use of the
product is given, it is only to be regarded as
application examples and recommendations.
Catalog specifications do not constitute
assured characteristics. The information given
does not release the user from the obligation
of own judgment and verification. It must be
remembered that our products are subject to
a natural process of wear and aging.
© This document, as well as the data,
specifications and other information set forth
in it, are the exclusive property of Bosch
Rexroth AG. It may not be reproduced or given
to third parties without its consent.
The cover shows an example configuration.
The product supplied may differ from the
solution shown here.
The original operating instructions were
prepared in German.

RE 29391-B/05.2021; 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10, Bosch Rexroth AG
3/48Content
Content
1 About this documentation 5
1.1 Validity of the documentation 5
1.2 Required and supplementary documentation 5
1.3 Representation of information 6
2 Safety instructions 8
2.1 About this chapter 8
2.2 Intended use 8
2.3 Improper use 9
2.4 Qualification of personnel 9
2.5 General safety instructions 10
2.6 Product-specific safety instructions 11
2.7 Safety equipment 14
2.8 Personal protective equipment 23
2.9 Obligations of the machine end-user 23
3 General information on damage to property anddamage to the product 24
4 Scope of delivery 25
5 About this product 26
5.1 Performance description 26
5.2 Product description 26
5.3 Identification of the product 27
6 Transport and storage 30
6.1 Storage of the valve on Multi-Ethernet basis 30
7 Installation 31
7.1 Unpacking 31
7.2 Installation conditions 31
7.3 Required tools 31
7.4 Recommended accessories 31
7.5 Before the installation 32
7.6 Place of installation 32
7.7 Mounting of the valve on Multi-Ethernet basis 32
8 Commissioning 37
8.1 Initial commissioning 37
8.2 Installation requirements 38
9 Operation 38
10 Maintenance and repair 39
10.1 Cleaning and care 39
10.2 Inspection and maintenance 40
10.3 Repair 40
11 Demounting and replacement 41
11.1 Required tools 41
11.2 Preparing demounting 41
11.3 Demounting 41
11.4 Preparations for storage and further use 42
12 Disposal 43
12.1 Environmental protection 43
12.2 Return to Bosch Rexroth AG 43

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12.3 Packaging 43
12.4 Materials used 43
12.5 Recycling 43
13 Extension and modification 44
14 Troubleshooting 44
14.1 How to proceed for troubleshooting 44
14.2 Fault table 45
15 Technical data 45
16 Annex 46
16.1 List of addresses 46
17 Alphabetical index 47

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1 About this documentation
1.1 Validity of the documentation
This documentation applies to the following valves with Multi-Ethernet interface:
• 4WRPD(H) (direct operated high-response valve with Ethernet interface and axis
control function, IAC Multi-Ethernet)
• 4WRLD (pilot-operated high-response valve with Ethernet interface and axis
control function, IAC Multi-Ethernet)
• 4/5 WRPQ... (direct operated high-response valve with Ethernet interface and
integrated electronic pressure compensator, IAC Multi-Ethernet and IFB Multi-
Ethernet)
• 4/5 WRPF... (direct operated high-response valve with Ethernet interface, IAC-
Multi-Ethernet and IFB Multi-Ethernet)
• 4WRLF (pilot-operated high-response valve with Ethernet interface, IFB Multi-
Ethernet)
• 4WRLQ (direct operated high-response valve with Ethernet interface and
integrated electronic pressure compensator, IAC Multi-Ethernet and IFB Multi-
Ethernet)
This documentation is intended for fitters, operators, service technicians and plant
operators.
This documentation contains important information on the safe and proper
mounting, transport, commissioning, operation, use, maintenance, demounting and
simple troubleshooting of the product.
 Read this documentation thoroughly and in particular chapter 2 “Safety
instructions“ and chapter 3 “General information on damage to property
anddamage to the product“, before working with the product.
1.2 Required and supplementary documentation
 The product must not be commissioned until you have been provided with the
documentation marked with the book symbol and you have understood and
observed it. Bosch Rexroth data sheets are available online at
www.boschrexroth.com/mediadirectory
Table 1: Required and supplementary documentation
Title Document
number
Document type
System documentation from the system manufacturer
Directional control valve, direct operated, with integrated digital axis controller (IAC
Multi-Ethernet), type 4WRPDH
29391 Data sheet
Directional control valve, direct operated, with integrated digital axis controller (IAC-
Multi-Ethernet), type 4WRPQ
29133 Data sheet
Directional control valve, direct operated, with integrated fieldbus (IFB Multi-
Ethernet), type 4WRPFH
29395 Data sheet
Directional control valves, direct operated, with electrical position feedback and
integrated fieldbus (IFB Multi-Ethernet), type 4WRPF
29131 Data sheet
Directional control valve, pilot operated, with integrated digital axis controller (IAC
Multi-Ethernet), type 4WRLD
29289 Data sheet

6/48 About this documentation
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
Title Document
number
Document type
Directional control valve, pilot operated, with integrated fieldbus (IFB Multi-Ethernet),
type 4WRLF
29293 Data sheet
Rexroth HydraulicDrive HDS-16, HDx17 to HDx-20 Parameters 30330-PA Reference book
Rexroth HydraulicDrive HDS-16, HDx17 to HDx-20 Diagnostic Messages 30330-WA Reference book
Rexroth HydraulicDrive HDx-20 Functions 30338-FK Application manual
Declaration of conformity of the complete valves on Multi-Ethernet basis Available from Bosch
Rexroth on request
General product information on hydraulic products 07008
Hydraulic valves for industrial applications 07600-B Operating instructions
Reliability characteristics MTTFDregarding functional safety according to EN ISO
13849
08012 Data sheet
1.3 Representation of information
Consistent safety instructions, symbols, terms and abbreviations are used in this
documentation so that you can quickly and safely work with the valve described.
For a better understanding, they are explained in the following sections.
1.3.1 Safety instructions
In this documentation, safety instructions are included in chapter2.6 “Product-
specific safety instructions“ and in chapter3 “General information on damage
to property anddamage to the product“ and whenever sequences of actions or
instructions are explained which bear the risk of personal injury or damage to
property. The described hazard avoidance measures must always be observed.
Safety instructions are structured as follows:
SIGNAL WORD
Type and source of danger!
Consequences in case of non-compliance
 Hazard avoidance measures
 <Enumeration>
•Warning symbol: draws attention to a hazard
•Signal word: identifies the degree of hazard
•Type and source of danger: Specifies the type and source of danger
•Consequences: describes the consequences in case of non-observance
•Precaution: specifies how the hazardous situation can be prevented

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Table 2: Hazard Classifications according to ANSI Z535.6-2011
Warning sign, signal word Meaning
DANGER Indicates a hazardous situation which, if not avoided, will
certainly result in death or serious injury.
WARNING Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE Damage to property: The product or the environment could
be damaged.
1.3.2 Symbols
The following symbols indicate notices which are not safety-relevant but increase
the comprehensibility of the documentation.
Table 3: Meaning of the symbols
Symbol Meaning
If this information is disregarded, the product cannot be used or operated
in an optimum manner.
 Individual, independent action
1.
2.
3.
Numbered instruction:
The numbers indicate that the actions must be carried out one after the
other.
1.3.3 Designations
The following terms are used in this documentation:
Table 4: Designations
Designation Meaning
IAC Multi-Ethernet Integrated axis controller based on a high-response valve
IndraWorks Operating software
RE xxxxx Rexroth document in English language
Sercos Interface for motion control applications
1.3.4 Abbreviations
The following abbreviations are used in this documentation:
Table 5: Abbreviations
Abbreviation Meaning
CCF Common Cause Failure
DCavg Average Diagnostic Coverage according to EN ISO 13849-1
FC Frequency converter
IAC Integrated Axis Controller
IFB Integrated Field Bus
I/O Inputs/outputs
MTTFdMean time to dangerous failure
PC Personal Computer
PELV Protective Extra Low Voltage
PFH Probability of dangerous failure per hour

8/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
Abbreviation Meaning
PL Performance Level according to EN ISO 13849-1
SELV Separated extra-low voltage
PLC Programmable Logic Control
2 Safety instructions
2.1 About this chapter
The valves on Multi-Ethernet basis described below have been manufactured
according to good engineering practice. However, there is still a risk of personal
injury and/or damage to property if you do not observe this chapter and the safety
instructions in this documentation.
 Read this documentation completely and thoroughly before working with the
product.
 Keep this documentation in a location where it is accessible to all users at all
times.
 Always include the required documentation when you pass the valve on to third
parties.
2.2 Intended use
A valve on Multi-Ethernet basis is a valve with electrical control for use in two-
channel safety applications (cat. 3, PL d and cat. 4, PL e according to EN 13849-1)
as switch-off element for one channel.
Depending on the application and the requirements of work equipment-related
standards according to EN 13849-1, the user must provide appropriate monitoring/
plausibility checks which comply with the required diagnostic coverage DCavg using
a higher-level control.
The valve is exclusively intended for integration into a machine or system or to
be assembled with other components to form a machine or system. The product
may be commissioned only if it is integrated in the machine/system for which it is
designed.
The operating conditions and the performance limits specified in the technical data
sheet must be observed.
The valve on Multi-Ethernet basis may be used as follows:
• For open and closed-loop (alternating) control of position, pressure, force,
velocity, pressure differential and flow
For operation of the device, a higher-level control logic with appropriate I/O
components is additionally required, which, in conjunction with the valve on Multi-
Ethernet basis, holistically controls the motion sequence of the machine and also
monitors it in terms of safety.

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The valve must not be used in potentially explosive atmospheres. The product is
intended exclusively for professional use and not for private usage.
Intended use includes having read and understood this documentation completely,
especially chapter 2 “Safety instructions“.
2.3 Improper use
Any use deviating from the intended use is improper and thus not admissible.
Improper use voids any warranty claims. It is also regarded as improper use if
the valve is operated outside the indicated performance limits and operating
conditions, especially the prescribed ambient conditions.
Bosch Rexroth AG does not assume any liability for damage caused by improper
use. The user assumes all risks involved with improper use.
2.4 Qualification of personnel
The activities described in this documentation require basic knowledge of
electrical installation, control technology, programming and hydraulics as well
as knowledge of the appropriate technical terms. In order to ensure safe use,
these activities may only be carried out by an expert in the respective field or an
instructed person under the direction and supervision of an expert.
Experts are those who are able to recognize potential hazards and apply the
appropriate safety measures due to their professional training, knowledge and
experience, as well as their understanding of the relevant requirements pertaining
to the work to be undertaken. An expert must observe the relevant specific
professional rules and have the necessary hydraulic expert knowledge.
Hydraulic expert knowledge means, amongst others:
• Reading and completely understanding hydraulic circuit diagrams,
• in particular, completely understanding the correlations regarding safety
equipment and
• knowledge of the function and structure of hydraulic components.
The operation of the digital IAC Multi-Ethernet axis control requires that the
operator is familiar with the IndraWorks Ds PC program. For a description on
handling the program as well as first steps for operation, please refer to
https://www.boschrexroth.com.
We recommend that users attend a product-specific training by Bosch Rexroth.
Bosch Rexroth offers training courses in specific fields. You can find an overview
of training contents on the Internet at: https://www.boschrexroth.com

10/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
2.5 General safety instructions
• Observe the valid regulations on accident prevention and environmental
protection.
• Observe the safety regulations and provisions of the country in which the product
is used/applied.
• Exclusively use Rexroth products in technically perfect condition.
• Observe all notices on the product.
• Persons who install, commission, operate, demount or maintain Rexroth products
must not consume any alcohol, drugs or pharmaceuticals that may affect their
ability to respond.
• Only use genuine Rexroth accessories and spare parts in order to exclude any
hazard to persons due to unsuitable spare parts.
• Comply with the technical data and ambient conditions specified in the product
documentation.
• The installation or use of inappropriate products in safety-relevant applications
could result in unintended operating states in the application which in turn could
cause personal injuries and/or damage to property. Therefore, only use a product
for safety-relevant applications if this use is expressly specified and permitted
in the documentation of the product, or if the safe suitability of the product in
the application is confirmed by a separate conformity assessment procedure,
e.g.in explosion protection zones or in safety-related parts of control systems
(functional safety).
• Do not commission the product until you can be sure that the end product (for
example a machine/system) where the Rexroth products are installed comply
with the country-specific provisions, safety regulations and standards of the
application.
• Please observe the safety-relevant information and risk specifications in the
operating instructions of the manufacturer of the connected hydraulic system
before commissioning the control with a hydraulic system.
• Please observe the general installation and safety regulations when working on
electrical systems.
• The information given in the product documentation with regard to the
use of the supplied components represents only application examples and
recommendations. The machine manufacturer and system installer must check
the suitability of the supplied components and the information given in this
documentation with regard to their use self-dependently for his individual
application and adjust it to the safety regulations and standards valid for his
application, and carry out the required measures, changes and amendments.
• Technical data as well as connection and installation conditions are available in
the product documentation and must be imperatively observed.
• In case of faults impairing the safety and changes in the operating behavior, shut
down the valve immediately and report the faults to the responsible personnel.
• Generally, you may not modify or convert the product, except for the pilot oil
supply of the pilot-operated valves 4WRLD, 4WRLF and 4WRLQ.

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2.6 Product-specific safety instructions
WARNING
Non-compliance with functional safety!
Valves control movements in machines or systems. In the case of mechanical and
electrical faults, e.g. failure of the power supply, persons may get caught, hurled
or crushed by the installation.
 When setting up your circuit, observe functional safety, e.g. according to EN
ISO 13849.
Hazardous movements!
It is not allowed for persons to stay within the range of motion of machines
and machine parts. The following are examples of possible measures against
unintended access of persons:
• Protective fences
• Protective grids
• Protective covers
• Light barriers
 If persons have to enter the hazard zone while the control is active, provide
superordinate monitoring functions on the system side or measures for
personal safety. These measures must be provided according to the specific
data of the system and on the basis of the risk and error analysis of the system
manufacturer/user. In this connection, the safety provisions applied for the
system must be taken into account.
 In case of faults impairing the safety and changes in the operating behavior,
shut down the valve immediately and report the faults to the responsible
personnel.
System parts under pressure and ejecting hydraulic fluid!
When working at hydraulic systems with stored pressure energy (accumulator
or cylinders working under gravity), valves may even be pressurized after the
pressure supply has been switched off. During installation and demounting, the
valves or parts may be hurled around and cause personal injuries and/or damage
to property. There is moreover the risk of serious injury caused by a powerful,
ejecting hydraulic fluid jet.
 Before working on the valve, ensure that the hydraulic system is depressurized
and the electrical control is de-energized.
 Completely depressurize machines and systems before working on hydraulic
products.

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WARNING
High electrical voltage by incorrect connection!
Danger to life, risk of injury by electric shock!
 The valve may only be connected by or under the supervision of a specialized
electrician.
 Switch off the voltage supply before all maintenance, repair or installation
work and secure it against restarting.
 Provide for proper, safe PE connection.
 As supply voltage of the valve on Multi-Ethernet basis, functional low voltages
with electric separation (PELV or SELV) according to VDE0100, part 410 must
be applied.
 For the external voltage supply, it must be ensured that, even in error cases,
the voltage limitation defined for the valve is not exceeded. PELV power supply
units according to EN 60204, section 6.4.2 comply with these requirements.
 Only connect voltages and power circuits that feature safe isolation from
dangerous voltages. Secure separation is achieved for example by means of
isolation transformers, secure optocouplers or mains-free battery operation.
Notice:
When calculating the PFH (probability of dangerous failure per hour) of the
safety function, the PFH of the external voltage supply must also be taken into
account.
Faulty fastening!
Mounting of valves with mounting screws of reduced stability, improper
mounting, or fastening at blocks and plates with insufficient stability may lead
to components becoming loose and falling down. Consequently, hydraulic fluid
may leak and lead to personal injuries and/or damage to property. Heavy weight
valves may cause bruises or fatal injury. Particular caution applies to valves with
suspended installation.
 Completely mount the valve according to the mounting specifications using
suitable mounting aids.
 Only mount the valve to blocks or plates suitable for the weight of the valve.
 Observe the tightening torques and bolt strengths.
Missing equipotential bonding!
Electrostatic processes, an incorrect earthing concept or missing equipotential
bonding may lead to malfunctions or uncontrolled movements at the machine and
thus cause injuries.
 Provide for correct earthing and provide for proper equipotential bonding.

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WARNING
Penetrating water and humidity!
In case of use in humid or wet environments, water or humidity may penetrate
at electrical plug-in connectors or the valve electronics. This case may lead to
malfunctions at the valve and to unexpected movements in the hydraulic system
which may result in personal injury and damage to property.
 Do not use the valve on Multi-Ethernet basis outside or below its intended IP
protection class.
 Ensure before the installation that all seals and caps of the plug-in
connections are present and intact.
Easily inflammable hydraulic fluid!
In connection with fire or other hot heat sources, leaking hydraulic fluid
mist, which results from defective or incompletely mounted valves and their
connections, may lead to fire or explosions.
 Do not use the valve in areas with open fire and only at a sufficient distance to
hot heat sources.
CAUTION
Contaminated hydraulic fluid!
Contamination in the hydraulic fluid may cause functional failures e.g. jamming or
blocking of nozzles of the valve. In the worst case, this may result in unexpected
system movements and thus constitute a risk of injury.
 Ensure adequate hydraulic fluid cleanliness according to the cleanliness
classes of the valve over the entire operating range.
Hot surfaces!
Valves may heat up considerably during operation. This may cause burns when
you touch the surfaces or, when the surface gets into contact with non-heat-
resistant or combustible material, this may result in damage to property or fire.
 Avoid contact with the valve during operation.
 Allow the valve to cool down sufficiently before touching it or wear protective
gloves.
 Keep non-heat-resistant or combustible material away from hydraulic valves.
 If necessary, attach protective covers.
Exceedance of the maximum temperatures!
Use of the valve outside the intended temperature may lead to functional failures
like e.g. due to overheating of the valve solenoids. In the worst case, this may
result in unexpected system movements and thus constitute a risk of injury.
 Only use the safety valve within the intended ambient and fluid temperatures.

14/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
CAUTION
Leakage in case of incorrect working temperatures!
Use of the valve outside the intended temperature range may lead to permanent
leakage at the valve. Thus, hydraulic fluid in the form of an ejecting hydraulic
fluid jet may injure persons, lead to damage to property and endanger the
environment.
 Only use the safety valve within the intended ambient and fluid temperatures.
 In case of leakage, immediately exchange damaged seal rings or the valve.
Corrosion!
If the valve is used in humid environments or water, the valve and mounting
screws may corrode. Thus, the mounting screws and the valves lose their stability
and may become loose and thus constitute a risk of injury.
 Use mounting screws with adequate corrosion protection and exchange
mounting screws that show serious corrosion damage.
 Provide for adequate corrosion protection and exchange valves with serious
corrosion damage at an early stage.
Contact with salt water leads to increased corrosion at the valve. Thus,
mounting screws and plug screws as well as moveable components such as
hand levers may be chemically corroded and damaged.
You should therefore take suitable corrosion protection measures.
2.7 Safety equipment
WARNING
Hazardous movements!
Danger to life, risk of injury or damage to property!
 Only use the approved spool types specified in the corresponding valve
data sheet. Otherwise, secure shutdown of the valve and the related safety
functionality are no longer provided.
2.7.1 Valve on Multi-Ethernet basis use according to EN13849-1
The valve on Multi-Ethernet basis can be used in systems up to PL e, category
4 according to EN13849-1. The valve can be used as shut-down element to
ensure compliance with the requirements of a secure start inhibitor according to
EN60204 stop category 0.
In two-channel applications, i.e. applications with PL d, cat. 3 and PL e, cat. 4
according to EN 13849-1, the valve can be used as shut-off channel.
As a precondition, appropriate monitoring/plausibility checks with the required
DCavg for the entire application must be provided by the user or programmed into a
higher-level control system.
Regarding valve monitoring, the valve only provides feedback signals which must
be evaluated by a higher-level control system in order to calculate the diagnostic
coverage according to EN 13849-1 and prove that the requirements are complied
with.

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In the higher-level control system, the two signals “enable" (sent to the valve) and
"enable acknowledgement" (fed back by the valve) have to be logically connected
and checked for plausibility according to the required safety level (cat., PL). In
case of a negative plausibility check or error, the higher-level control system has to
initiate immediate shut-off/safety function.
The 24 V supply voltage at the valve may be applied permanently as long as no
error is detected by the higher-level control system.
By removal of the enable signal at the valve electronics, the output stage is
disconnected from the supply voltage by means of a high-side switch.
The Multi-Ethernet electronics link the supply voltage disconnection of the output
stage to the respective failsafe switching position of the spool and generate the
"enable acknowledgement" signal.
Additionally, the signals "enable" (sent to the valve) and "enable
acknowledgement" (fed back by the valve) or a change of these signals have
to be logically interconnected by a higher-level control system and checked for
plausibility. Every change of the enable signal ("L" or "H") must lead to a prompt
reaction of the related enable acknowledgement signal (inverted to enable signal
"H" or "L").
If this reaction on the signal change does not occur in time, the higher-level control
system must immediately initiate the emergency shut-down of the system.
By removal of the enable signal at the valve electronics, the output stage of the
pilot valve is disconnected from the supply voltage by means of a high-side switch.
The Multi-Ethernet electronics link a disconnection of the supply voltage of the
pilot valve's output stage with safe reaching of the central position of the main
stage spool and generate the "enable acknowledgement" signal.
Additionally, the signals "enable" (sent to the valve) and "enable
acknowledgement" (valve response) or a change of these signals have to be
logically interconnected by a higher-level control system and checked for
plausibility.
Every change of the enable signal ("L" or "H") must lead to a prompt reaction of
the related enable acknowledgement signal (inverted to enable signal "H" or "L").
If this reaction on the signal change does not occur in time, the higher-level control
system must immediately initiate the emergency shut-down of the system.
By removal of the direction-dependent enable signal (PA or PB) at the valve
electronics, the respective output stage is disconnected from the supply voltage by
means of a high-side switch.
The Multi-Ethernet electronics links the supply voltage disconnection of the
output stage to the relevant failsafe position of the spool and generate the "enable
acknowledgement" signal from this.
Additionally, the signals "direction-dependent enable" (sent to the valve) and
"direction-dependent enable acknowledgement" (valve response) or a change of
these signals have to be logically connected by a higher-level control system and
checked for plausibility.
Every change of the direction-dependent enable signal ("L" or "H") must lead to
a prompt reaction of the related direction-dependent enable acknowledgement
signal (inverted to direction-dependent enable signal "H" or "L").
Safety functionality of
valves type 4WRPDH,
4WRPD...EA/EB, 4WRPFH,
4WRPF...EA/EB, 4WRPQH,
5WRPF10, 5WRPQ10
(direct operated valves
with one control solenoid)
Safety function of valve
types 4WRLD, 4WRLF and
4WRLQ (pilot operated
valves, pilot valve with
one control solenoid)
Safety functionality of
valve types 4WRPD,
4WRPF, 4WRPQ (direct
operated valves with two
control solenoids)

16/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
If this reaction on the signal change does not occur in time, the higher-level control
system must immediately initiate the emergency shut-down of the system.
An application with two valves including two-channel control and monitoring (DCavg
99 %) fulfills the necessary requirements to achieve a PL e, cat. 4 according to
EN13849-1.
With the exception of "enable" and "enable acknowledgement", all other signals
do not form part of the safety function and must therefore not be used for safety-
relevant functions.
Despite all measures taken in terms of plausibility check and monitoring, the use
of the valve involves a certain residual risk, which must not be neglected. It must
in any case be evaluated by the machine integrator depending on the individual
application. For appropriate evaluation, Bosch Rexroth provides the safety
parameters of the valve on Multi-Ethernet basis according to EN 13849-1. See
chapter 2.7.4 “MTTFd, DC, CCF“.
2.7.2 Limits of the safety-related parts
Assessment of the valve on Multi-Ethernet basis according to ISO 13849-2:
• A valve on Multi-Ethernet basis is suitable for channel shut-off according to
EN13849-1. An appropriate control system must be provided which ensures
plausibility checks between the direction-dependent enable input of the valve
and the direction-dependent "enable acknowledgement" signal issued by the
valve (see chapter 2.7.1).
• Potential failures or unidentified error states of the valve on Multi-Ethernet basis
always require application-dependent and suitable system-related measures
according to EN 13849-1 (see chapter 2.7.1).
• A valve on Multi-Ethernet basis is not suitable as shut-off element according to
category 1 if merely the enable is used without a cyclic evaluation of the enable
acknowledgement. The requirements for the cyclic evaluation must be observed
depending on the specific application.
2.7.3 Residual risks/error states
The following residual risks or error states may occur and must be taken into
account on the system side by providing appropriate measures:
• Complete failure of the electronics of the valve
• Faulty output of operating states
• Failure of the enable inputs or enable acknowledgement outputs
• Delayed reaction to signal changes
• Uncontrolled movement of the valve spool (may lead to uncontrolled movement
of the cylinder, for example)
• Undefined behavior of the electronics of the valve on Multi-Ethernet basis if
signals "enable P-A" or "enable P-B" are provided in the overlap area (5...15 V
according to IEC 61131-2:2008, type 1)
• Difficult level recognition of enable acknowledgement and thus no activation of
the safety function if the enable acknowledgement outputs are not connected to
current sinking inputs according to IEC 61131-2:2008 (types 1, 2 or 3).
• Fuse protection in the case of short-circuits in the electronics of the valve on
Multi-Ethernet basis by means of appropriate protection and design of the supply
line (fuse protection against currents > 4 A).

Safety instructions 17/48
RE 29391-B/05.2021; 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10, Bosch Rexroth AG
2.7.4 MTTFd, DC, CCF
For valves on Multi-Ethernet basis, MTFFdvalves can be calculated according to the
information specified in the table using the following formula:
Table 6: Information for calculation of the MTTFdvalue
For the MTTFd values given, the restrictions apply that are described in RE 08012
(see “Exceptions/limitations“ regarding “Admissible spool designs; maximum
longitudinal spool acceleration” in the chapter “Proportional directional valves” on
page 5).
The DC depends on the system and on the use of a safety PLC (see chapter 2.2
“Intended use“).
By using the valves as intended, a CCF of at least 65 points can be reached.
=
+ +
1
1 1 1
dTotalMTTF
MTTFdHydraulic part MTTFdSwitch-off path MTTFdMains adaptor
MTTFdvalues
Type of
actuation
Valve type Hydraulic
components
Switch-off path SELV/PELV power
supply unit
MTTFdvalue
Valve and
switch-off path
electronics
(w/out power
supply unit)
Example of total
MTTFdvalue
(for power supply
unit with MTTFd
value of 1 million h)
Direct
operated
valves
4WRPFH
4WRPDH
4WRPQH
4WRPF...EA/EB
5WRPF10
5WRPQ10
(single-solenoid
valves)
150 years 1000 years
MTTFdvalue depending
on power supply unit
manufacturer
(MTTFd= approx. 2 x
MTBF)
e.g. MTBF = 500000 h
 MTTFdvalue =
approx. 1 million h (114
years)
130 years 0
4WRPD
4WRPF
4WRPQ
(double-solenoid
valves)
150 years 1000 years
(only one switch-off
path regarded as
safety-relevant)
130 years 60
Pilot operated
valves
4WRLD
4WRLF, 4WRLQ
75 years 1000 years 69 years 43

18/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
2.7.5 Limits for operation
The following operating conditions apply to the valve, see data sheet.
• Ambient temperature range: -20...60 °C
• Supply voltage range 18...36 VDC, see data sheet.
• Voltage range of the enable inputs 0...+36 VDC. Additional external precautionary
measures must be taken against overvoltage, e.g. in the form of fuses and
varistors.
• Level recognition of the enable inputs according to IEC 61131-2:2008, type 1
• The enable acknowledgement outputs must be connected to switching inputs
according to IEC 61131-2:2008 (types 1, 2 or 3; current sinking).
Variations may occur depending on the valve used. They can be found in the
corresponding valve data sheet. There, you also find the valve-related operating
conditions.
2.7.6 Independence of operating modes
The safety function of the valve with Multi-Ethernet electronics is independent
of the operating modes. However, the safety function can only be used if the
Multi-Ethernet electronics are combined with suitable valve functions (e.g. spool
overlap). The relevant information can be found in the corresponding valve data
sheet. The data sheets also list, which operation modes are supported by the
Multi-Ethernet electronics together with the valve.
2.7.7 Switch-off time
The switch-off time generally depends on the valve type used and the hydraulic
operating state. The following table lists typical values below the power limit. The
min. switch-on time results from linking of solenoid enable and position. For this
reason, only the electrical part is relevant.

Safety instructions 19/48
RE 29391-B/05.2021; 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10, Bosch Rexroth AG
Table 7: Typical switch-on and switch-off times
Valve type Min. switch-on time Typical switch-off time
4WRPFH6 0.2 ms < 40 ms
4WRPFH10 0.2 ms < 50 ms
4WRPDH6 0.2 ms < 40 ms
4WRPDH10 0.2 ms < 50 ms
4WRPF6 0.2 ms < 50 ms
4WRPF10 0.2 ms < 60 ms
4WRPF10EA/EB 0.2 ms < 60 ms
4WRLF16 0.2 ms 125 ms (with command value -100 %),
60 ms (with command value +100 %)
(@ p = 280 bar operating pressure)
4WRLF25/27 0.2 ms 210 ms (with command value -100 %),
140 ms (with command value +100 %)
(@ p = 280 bar operating pressure)
4WRLD16 0.2 ms 125 ms (with command value -100 %),
60 ms (with command value +100 %)
(@ p = 280 bar operating pressure)
4WRLD25/27 0.2 ms 210 ms (with command value -100 %),
140 ms (with command value +100 %)
(@ p = 280 bar operating pressure)
2.7.8 Notice on the operation of enable inputs with a safety PLC
For some safety PLCs the switching outputs are subjected to light and dark tests.
Our dynamic high-response valves respond very quickly to signal changes at the
enable inputs. This may result in unintended valve movements. The test duration
should not exceed times of 100 µs.

20/48 Safety instructions
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
2.7.9 Connection example/block diagram for direct operated valves with one
solenoid
For type III according to EN 201:2009, two separate switch-off paths are required.
The following overview illustrates a realization example of a switch-off path for an
injection molding machine with direct operated valve with one solenoid on Multi-
Ethernet basis. For the second switch-off path, an additional suitable valve is
required. For this application, the specific requirements of EN 201:2009 are to be
complied with.
The connection example only shows the safety-relevant signals of the Multi-
Ethernet electronics. For all other signals and interfaces, refer to the valve-specific
data sheets.
Fig. 1: Block diagram for direct operated valves with one solenoid
a0b
AB
PT
b
G
U
(1236) = 8+4
(ABCD) = 6+PE
1, 2, 3, 8 are safety-relevant
connections of the 11+PE connector of
the valve on Multi-Ethernet basis; for
additional connections, see valve data
sheet. (Values in brackets: connections
when using a 8+4 connector and when
using a 6+PE connector)
Hydraulics
actuator side
PELV/SELV
24 V mains adaptor
according to
VDE0100
part 410
Enable signal
that can be
switched off
safely
Enable
3(3)(D) 1(1)(A) 2(2)(B)
24 V
(18...36 V)
GND
Inputs
Multi-Ethernet
electronics
Outputs
Enable acknowledgement
Hydraulics supply side
8(6)(C)