Pilz PNOZ m1p base unit User Manual

Operating Manual PNOZmu lti Special Applica tions

Operating Manual PNOZmulti Special Applications

PNOZmulti Special Applications

Configurable Control System PNOZmulti

Operating Manual — No. 1002337-EN-02

This document is a translation of the original document.

All rights to this documentation are reserved by Pilz GmbH & Co. KG. Copies may be made
for internal purposes.

Suggestions and comments for improving this documentation will be gratefully received.

Pilz®, PIT®, PMI®, PNOZ®, Primo®, PSEN®, PSS®, PVIS®, SafetyBUS p®, SafetyEYE®,
SafetyNET p®, the spirit of safety® are registered and protected trademarks of
Pilz GmbH & Co. KG in some countries.

SD means Secure Digital.

Preface

Contents

Contents

Contents Page

Chapter 1 Introduction

1.1 Overview of documentation 1-1

1.2 Definition of symbols 1-2

Chapter 2 Muting

2.1 Introduction 2-1

2.2 Safety 2-2

2.2.1 Intended use 2-2

2.2.2 Standards 2-2

2.2.3 Safety guidelines 2-2

2.3 Configuration in the PNOZmulti Configura-

2-4

tor

2.3.1 Functions 2-4

2.3.2 Input parameters 2-4

2.3.3 Output parameters 2-4

2.3.4 Monitoring times 2-5

2.3.5 Suspension of muting (override) 2-5

2.3.6 Reset 2-6

2.3.7 Restarting the muting time 2-6

2.4 Operating modes 2-7

2.4.1 Terminology 2-7

2.4.2 Sequential muting 2-7

2.4.2.1 Position of the muting sensors 2-7

2.4.2.2 Switch conditions in sequential mode 2-8

2.4.2.3 Sequence errors 2-9

2.4.2.4 Diagnostic word 2-10

2.4.2.5 Timing diagram (example) 2-10

2.4.3 Parallel muting 2-11

2.4.3.1 Position of the muting sensors 2-11

2.4.3.2 Switch conditions in parallel mode 2-12

2.4.3.3 Diagnostic word 2-12

2.4.3.4 Timing diagram (example) 2-13

2.4.4 Cross muting 2-14

2.4.4.1 Position of the muting sensors 2-14

2.4.4.2 Switch conditions in cross mode 2-15

2.4.4.3 Diagnostic word 2-16

2.4.4.4 Timing diagram (example) 2-16

Chapter 3 Safety Mat/Safe Edge

3.1 Introduction 3-1

3.2 Safety 3-2

3.2.1 Intended use 3-2

3.2.2 Safety guidelines 3-2

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1

Contents

3.3 Function description 3-3

3.4 Configuration in the PNOZmulti Configura-

3.4.1 Allocation of test pulses to inputs 3-4

3.5 Commissioning the safety system 3-5

3.5.1 Preparing for commissioning 3-5

3.5.2 Preparing for operation 3-5

3.6 Operation 3-7

3.6.1 Diagnostic word 3-7

3.7 Technical Details 3-8

Chapter 4 Burners

4.1 Introduction 4-1

4.2 Safety 4-2

4.2.1 Intended use 4-2

4.3 Configuration in the PNOZmulti Configura-

4.3.1 Functions 4-3

4.3.2 Monitoring functions/settings for the burn-

4.3.2.1 Combustion air pressure monitoring, acti-

4.3.2.2 Ignition 4-5

4.3.2.3 Flame monitoring 4-5

4.3.2.4 Compound controller 4-6

4.3.2.5 Tightness control 4-6

4.3.2.6 High temperature 4-7

4.3.2.7 Plant-dependent monitoring functions 4-8

4.3.2.8 Shutdown types 4-8

4.3.2.9 Step times 4-9

4.4 Burner cycle 4-11

4.4.1 Steps 4-11

4.4.2 Errors during the burner cycle 4-11

4.4.3 Master burner with direct ignition 4-12

4.4.4 Master burner with separate flame moni-

4.4.5 Master burner with joint flame monitoring 4-16

4.4.6 Slave burner with direct ignition 4-17

4.4.7 Slave burner with separate flame monitor-

4.4.8 Slave burner with joint flame monitoring 4-18

4.4.9 Example: Viewing the burner cycle in the

4.5 Inputs and outputs 4-22

4.5.1 Element's inputs 4-22

3-4

tor

4-3

tor

4-4

er cycle

4-4
vating the combustion air blower, com­pound controller monitoring

4-14
toring

4-17
ing

4-19
PNOZmulti Configurator

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2

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Contents

4.5.1.1 Operation 4-22

4.5.1.2 Monitoring functions 4-22

4.5.2 Element's outputs 4-24

4.6 Configuration examples 4-26

4.6.1 Burner configuration 4-26

4.6.1.1 Burner structure 4-26

4.6.1.2 Burner properties 4-26

4.6.1.3 Configuration in the PNOZmulti Configura­tor

4.6.2 Connecting the safety valves 4-27

Chapter 5 Loop formation (LOOP)

5.1 Introduction 5-1

5.1.1 Intended use 5-1

5.2 Function description 5-2

5.3 Example configurations 5-3

5.3.1 Application using one loop 5-3

5.3.2 Application using two loops 5-3

4-26

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3

Contents

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4

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1 Introduction

1.1 Overview of documentation

11000IntroductionIntroduction1-1.1Overview of documentation1100Overview of documentation1-Einf_Uebersicht_über_die_Doku-spezielle Applikationen

1 Introduction

The introduction is designed to familiarise you with the contents, struc­ture and specific order of this manual.

2 Muting

This chapter describes the muting function with units from the config­urable control system PNOZmulti.

3 Safety Mat/Safe Edge

This chapter describes the use of pressure-sensitive protective devices
with the PNOZmulti.

4 Burners

This chapter describes how to control and monitor burners with the con­figurable control system PNOZmulti.

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1-1

1 Introduction

1.2 Definition of symbols

1.2Definition of symbols1200Definition of symbols1-Einfhrung Zeichen

Information that is particularly important is identified as follows:

DANGER!

This warning must be heeded! It warns of a hazardous situation
that poses an immediate threat of serious injury and death and
indicates preventive measures that can be taken.

WARNING!

This warning must be heeded! It warns of a hazardous situation
that could lead to serious injury and death and indicates preven­tive measures that can be taken.

CAUTION!

This refers to a hazard that can lead to a less serious or minor
injury plus material damage, and also provides information on
preventive measures that can be taken.

NOTICE

This describes a situation in which the unit(s) could be damaged
and also provides information on preventive measures that can
be taken. It also highlights areas within the text that are of partic­ular importance.

INFORMATION

This gives advice on applications and provides information on
special features.

1-2

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2Muting

2.1 Introduction

22000MutingMuting2-2.1Introduction2100Introduc tion2-Muting_Einführung

This chapter describes the muting function with units from the config­urable control system PNOZmulti. The safe inputs and outputs from
base units and expansion modules are suitable.

NOTICE

With a muting application, please refer to the operating manuals
provided with the units. Please also refer to the PNOZmulti tech­nical catalogue.

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2-1

2Muting

2.2 Safety

2.2Safety2200Safety2-

2.2.1 Intended use

Intended use2-Muting_Sicherheit_Bestimmungsgemäße Verwendung

The muting logic element is used to temporarily suspend safety func­tions (ESPE/AOPD) without interrupting the process (muting) in accord­ance with EN 61496-1. For a limited time period and a specific
operational phase (e.g. when feeding materials), it will suspend the ef­fect of safety devices during the working process. Once completed, it
will reset the safety function.

Use of this operating mode and the arrangement of the sensors are ma­chine or plant-specific and depend on the risk assessment of the ma­chine or plant.

Be sure that you observe the warning notes given in the other parts of
this configuration guide and in the PNOZmulti technical catalogue.
These are highlighted visually through the use of symbols.

2.2.2 Standards

Standards2-Muting_Sicherheit_Normen

CAUTION!

Failure to observe the safety regulations in this configuration
guide and in the PNOZmulti technical catalogue will render the
warranty invalid.

Knowledge of and compliance with the relevant standards and direc­tives are a prerequisite for using the muting function. The following gives
an overview of the most important standards:

 EN 61496-1: Safety of machinery – Electrosensitive protective equip-

ment

 EN 60947-5-3: Low voltage switchgear and controlgear - Control cir-

cuit devices and switching elements

 EN 999: Safety of machinery - The positioning of protective equip-

ment

Please note this is not an exhaustive list of safety standards and direc­tives.

2-2

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2Muting

2.2 Safety

2.2.3 Safety guidelines

Safety guidelines2-Muting_Sicherheit_Siche rheitshinweise

WARNING!

The following information must be heeded! Failure to comply
with these guidelines could result in serious injury or death.

 Refer to EN 61496-1 and EN 60947-5-3 when configuring, setting up

and operating the muting device.

 Refer to EN 999 with regard to the positioning of the AOPD.
 Measures must be taken to exclude common cause failures, e.g. by

the use of non-equivalent signals or diverse sensors.

 Muting switches should be positioned so that it is impossible for a

person to trigger the muting function.

 The vehicle should be designed to make it impossible for people to

ride on it.

 Limit the size of the entry area by applying appropriate safety meas-

ures. People must not be able to enter the danger zone during the
muting phase.

 If various transport speeds are being used, consider the total duration

of the muting phase.

 Remember that a new muting phase can only be introduced once the

previous phase has been completed.

 Maintenance gates should be provided if you secure equipment

through muting.

 Please note that if the maintenance gates are opened, the plant ab-

solutely must be brought to a standstill in accordance with the risk

classification.

 Use of muting sensors with contacts: Supply the contacts of the mut-

ing sensors via test pulse outputs (test pulses).

 Use of ESPE as muting sensors: Test pulses cannot be used. For this

reason, be sure to use a N/O contact as sensor 1 and a N/C contact
as sensor 2 for fault detection (shorts across contacts).

 Laying the connection cable to the sensors in a way that is protected

against shorts (i.e. separate) may provide an alternative to non-equiv­alent sensors.

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2-3

2Muting

2.3 Configuration in the PNOZmulti Configurator

2.3Configuration in the PNOZ multi Configurator2300Configurat ion in the PNOZmulti C onfigurator2-

2.3.1 Functions

Functions2-Muting_Konfiguration_Funktionen

2.3.2 Input parameters

Input parameters2-Muting_Konfiguration_Eingangsparameter

 Muting via light beam devices or limit switches
 Override option in case of fault
 Max. muting time can be set
 Muting sensors can be monitored for simultaneity
 Configuration of bounce time for contact-based muting sensors
 Sequence of the muting sensors can be monitored
 Operating modes

– Sequential muting
– Parallel muting
–Cross muting

 Muting sensor 1

N/O contact of muting sensor 1
Muting sensor 1 = 0: Not operated
Muting sensor 1 = 1: Operated

 Muting sensor 2

N/O contact of muting sensor 2
Muting sensor 2 = 0: Not operated
Muting sensor 2 = 1: Operated

 Light curtain

Light curtain = 0: Interrupted
Light curtain = 1: Not interrupted
Assign the light curtain input parameter to the output of the light cur­tain function element. The light curtain function element must be
configured with an automatic reset.

 Muting sensor 3

N/O contact of muting sensor 3
Muting sensor 3 = 0: Not operated
Muting sensor 3 = 1: Operated

 Muting sensor 4

N/O contact of muting sensor 4
Muting sensor 4 = 0: Not operated
Muting sensor 4 = 1: Operated

 Muting override

Muting override = 1: Suspend the muting function if a fault occurs
(override) to override the muting channel.

 Reset = 0/1 pulse edge: Reset muting after an error or start the muting

time.

2-4

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2Muting

2.3 Configuration in the PNOZmulti Configurator

2.3.3 Output parameters

Output parameters2-Muting_Konfiguration_Ausgangsparameter

2.3.4 Monitoring times

Monitoring times2-Muting_Konfiguration_Überwachungszeiten

 Enable

Enable = 0: Error detected (e.g. simultaneity exceeded)
Enable = 1: The enable is granted if no error has been detected.

 Muting active

Display of muting status (e.g. for activating a lamp)
Muting active = 0: No muting (light curtain not suspended)
Muting active = 1: Muting active (light curtain suspended)

 Maximum muting time

This setting is used to adjust the maximum permitted muting time.
Permitted value range: 1 ... 900s (= 15 minutes)

 Simultaneity

This setting is used to define the maximum time (synchronisation
time) which is permitted to elapse between the actuation (0/1-pulse
edge) of muting sensors 1 and 2 or muting sensors 3 and 4.
Permissible value range for parallel muting and cross muting: 1 ... 3 s
Permitted value range for sequential muting: 1 ... 30 s

 Bounce time

This setting can be used to set the time up to the point at which the
muting sensors finally make contact.
Permitted value range: 50 ..0.800 ms

2.3.5 Suspension of muting (override)

Suspension of muting (override)2-Muting_Konfiguration_Muting-Überbrückung_Override

If there are faults, the muting station can be overridden via the muting
override input parameter.

 Start-up condition

Muting override can be switched on if at least one of the muting sen­sors is active. The enable output and
are set during the override. The override is monitored and has a max­imum duration that corresponds to the set muting time.

 Switch-off condition

Muting override is switched off if

– the muting time has elapsed

or

– no muting sensor is active and the light curtain is clear

or

– muting override is reset to 0 (release override button).

muting active

output parameter

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2-5

2Muting

2.3 Configuration in the PNOZmulti Configurator

CAUTION!

The following additional safety requirements apply to the muting
override:

– The override switch must have a hold-to-run control device

(touch-operated switch).

– The override switch must be installed in a fixed position out-

side the danger zone.

– The danger zone and the muting station must be visible

from the override switch position.

– The danger zone must be identified as clear before the over-

ride switch is operated and while it is operated.

2.3.6 Reset

Reset2-Muting_Konfiguration _Reset

Reset resets the muting element after a fault or during start-up if

 no muting sensor is operated

and

 the light curtain is clear.

2.3.7 Restarting the muting time

Restarting the muting time2-Muting_Konfiguration_Neu start der Muting-Zeit

Reset resumes muting and restarts the muting time if

 muting was ended as a result of the muting time having elapsed (e.g.

by the conveyor feed stopping)

and

 the muting sensors are returning feasible signals and the light curtain

has not been interrupted.

CAUTION!

The following additional safety requirements apply for the reset
button:

– The danger zone and the muting station must be visible

from the reset button position.

– The reset button may not be operated until the danger zone

has been viewed and has been identified as clear.

2-6

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2Muting

2.4 Operating modes

2.4Operating modes2400Operating modes2-Muting_Betriebsarten

The following operating modes can be implemented:

 Sequential muting
 Parallel muting
 Cross muting

WARNING!

"During muting safe conditions shall be provided by other
means" (EN 954-1). For example, this may be achieved by the
conveyed item blocking access to the danger zone. Even open­ings in or between the individual parts of the conveyor flow must
never enable access.

2.4.1 Terminology

Terminology2-Muting_Betriebsarten_Begriffsbestimmungen

 Muting On

"Muting On" is the switch condition for switching on the muting func­tion. When muting is switched on, the

Muting active

output parame-

ter has a 1 signal and time monitoring runs.

 Muting Off

"Muting Off" is the switch condition for ending the muting function.
When the muting function is ended, output parameter

Muting active

has a 0 signal.

INFORMATION

You will find important additional information on the use of sen­sors or contacts in the section entitled "Safety".

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2-7

2Muting

MS1

MS2 MS3 MS4

AOPD

AOPD

W

A

B

2.4 Operating modes

2.4.2 Sequential muting

Sequential muting2-

2.4.2.1 Position of the muting sensors

Position of the muting sensors2-Muting_Betriebsarten_sequenzielles Muting-Anordnung der Muting-Sensoren

 The distance between the muting sensors MS1 and MS2 / MS3 and

MS4 should be as large as possible.

 Vehicle length W must be greater than the distance between MS1 and

MS3 or MS2 and MS4 (W > A and W > B).

 MS2 and MS3 must be positioned as close as possible in front of/be-

hind the AOPD.

2-8

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2Muting

2.4 Operating modes

2.4.2.2 Switch conditions in sequential mode

Switch conditions in sequential mode2-Muting_Betriebsarten_sequenzielles Muting-Schaltbedingungen

Muting On

Entering the danger zone:

1. Muting sensors MS1 and MS2 must be operated consecutively (first
MS1, then MS2) within the configured simultaneity period. Muting is
activated by operating MS2.

2. Muting sensors MS3 and MS4 must be operated consecutively (first
MS3, then MS4) within the configured simultaneity period.

3. MS1 and MS2 must be cleared consecutively (first MS1, then MS2).

4. MS3 and MS4 must be cleared consecutively (first MS3, then MS4).

Leaving the danger zone:

1. Muting sensors MS4 and MS3 must be operated consecutively (first
MS4, then MS3) within the configured simultaneity period. Muting is
activated by operating MS3.

2. MS2 and MS1 must be operated consecutively (first MS2, then MS1).

3. MS4 and MS3 must be cleared consecutively (first MS4, then MS3).

4. MS2 and MS1 must be cleared consecutively (first MS2, then MS1).

Muting Off

Suspension of the safety function is cancelled as soon as the penulti­mate muting sensor, MS2 or MS3, is no longer operated, i.e. only
one muting sensor remains operated.

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2-9

2Muting

MS1

MS2

MS3 MS4

AOPD

W > C

A

B

C

2.4 Operating modes

2.4.2.3 Sequence errors

Sequence errors2-Muting_Betriebsarten_sequenzielles Muting-Sequenzfehler

The muting sensors must be operated in a specific sequence in sequen­tial mode. Once a particular directional movement has started (entry or
exit), it must be fully completed. Any deviation from the sequence shown
causes the enable output (enable = 0) and the output parameter

active

Vehicle length W greater than distance C between MS1 and MS4

All sensors are temporarily operated as the vehicle passes through. The
first muting sensor (MS1 upon entering, MS4 upon exiting) only be­comes clear once all muting sensors have been operated.

Muting

to reset.

2-10

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2Muting

MS1

MS2

MS3 MS4

AOPD

W < C

A

B

C

2.4 Operating modes

Vehicle length W less than distance C between MS1 and MS4

As the vehicle passes through, the first muting sensor becomes clear
(MS1 upon entering, MS4 upon exiting) before the last muting sensor
has been operated.

MS1 MS2 MS3 MS4 Travel direction

0000
1000
1100
1110
1/0 1 1 1/0
0111
0011
0001
0000

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2-11

2Muting

1
0

1

Reset

1
0

1
0

1
0

1
0

1
0

32 4

MS1

MS2

Mut ing

Enabl e

AOPD

t

sync

t

sync

t

MUT

MS4

MS3

1
0

1
0

2.4 Operating modes

2.4.2.4 Diagnostic word

Diagnostic word2-Muting_Betriebsarten_Muting-Diagnosewort

Muting_Betriebsarten_Muting-Diagnosewort-bit10-para-sequ

2.4.2.5 Timing diagram (example)

Timing diagram (example)2-Muting_Betriebsarten_sequenzielles Muting-Zeitdiagramm

Messages can be queried in the PNOZmulti Configurator in bit mode
and linked further within the program.

 Bit 1: Light curtain, interrupted (without active muting)
 Bit 2: Waiting for reset (reset)
 Bit 3: Sensor status unfeasible, override required
 Bit 8: Muting time exceeded
 Bit 9: Feasibility error, simultaneity period exceeded on muting sen-

 Bit 10: Feasibility error, simultaneity period exceeded on muting sen-

sors 1 and 2, only one sensor operated

sors 3 and 4, only one sensor operated

Vehicle length W less than distance C between MS1 and MS4

Key:
t

= Simultaneity

sync

t

= Muting time

MUT

: Set enable with reset
: Start muting via MS1/MS2
: End muting by clearing MS3
: Restart muting via MS1/MS2

2-12

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2Muting

MS3

AOPD

AOPD

MS1

MS2

MS4

W

A

2.4 Operating modes

2.4.3 Parallel muting

Parallel muting2-

2.4.3.1 Position of the muting sensors

Position of the muting sensors2-Muting_Betriebsarten_paralleles Muting-Anordnung der Muting-Sensoren

 Muting sensors MS1 and MS2/MS3 and MS4 must be positioned at

the same height to the left and right of the vehicle.

 The vehicle length W must be greater than distance A between MS1

and MS3/MS2 and MS4.

 The distance between the light curtain and the muting sensor must be

as short as possible.

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2-13

2Muting

2.4 Operating modes

2.4.3.2 Switch conditions in parallel mode

Switch conditions in parallel mode2-Muting_Betriebsarten_paralleles Muting-Schaltbedingungen

Muting On

Entering the danger zone:

1. Muting sensors MS1 and MS2 must be operated within the config­ured simultaneity period. Muting is activated.

2. Muting sensors MS3 and MS4 must be operated within the config­ured simultaneity period, before MS1 and MS2 are cleared.

Leaving the danger zone:

1. Muting sensors MS3 and MS4 must be operated within the config­ured simultaneity period. Muting is activated.

2.4.3.3 Diagnostic word

Diagnostic word2-Muting_Betriebsarten_Muting-Diagnosewort

Muting_Betriebsarten_Muting-Diagnosewort-bit10-para-sequ

2. Muting sensors MS1 and MS2 must be operated before MS3 and
MS4 are cleared.

Muting Off

Suspension of the safety function is cancelled as soon as the penulti­mate muting sensor, MS3/MS4 upon entering or MS1/MS2 upon exiting,
is no longer operated. In other words, only one muting sensor remains
operated.

Messages can be queried in the PNOZmulti Configurator in bit mode
and linked further within the program.

 Bit 1: Light curtain, interrupted (without active muting)
 Bit 2: Waiting for reset (reset)
 Bit 3: Sensor status unfeasible, override required
 Bit 8: Muting time exceeded
 Bit 9: Feasibility error, simultaneity period exceeded on muting sen-

sors 1 and 2, only one sensor operated

 Bit 10: Feasibility error, simultaneity period exceeded on muting sen-

sors 3 and 4, only one sensor operated

2-14

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2Muting

1
0

1

Reset

1
0

1
0

1
0

1
0

1
0

32 4

MS1

MS2

Muting

Enable

AOPD

t

sync

t

sync

t

MUT

MS4

MS3

1
0

1
0

2.4 Operating modes

2.4.3.4 Timing diagram (example)

Timing diagram (example)2-_Dummy-Vorlage

Key:
t

= Simultaneity

sync

= Muting time

t

MUT

: Set enable with reset
: Start muting via MS1/MS2
: End muting by clearing MS3 or MS4
: Restart muting via MS1/MS2

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2-15

2Muting

AOPD

AOPD

MS1

MS2

2.4 Operating modes

2.4.4 Cross muting

Cross muting2-

2.4.4.1 Position of the muting sensors

Position of the muting sensors2-Muting_Betriebsarten_Kreuz- Muting-Anordnung der Muting-Sensoren

 Muting sensors may be reflective or send/receive light beam devices,

for example. The beams must always intersect within the danger
zone.

 The muting sensors must be positioned in such a way that the light

curtain is interrupted before the beam intersection can be reached
from outside the danger zone.

 Muting sensors MS3 and MS4 are not used.

2-16

WARNING!
Loss of safety function due to incorrect position of muting
sensors

Depending on the application, serious injury or death may result.
Ensure that you comply with the installation dimensions shown
in the figure overleaf.

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2Muting

max. 20 ... 30 cm

min. 20 cm

Muting sensor

Muting sensor

Muting sensor

Danger zone

Intersection of
muting sensor beams

Light curtain
Access guarding

2.4 Operating modes

Fig. 2-1: Position of the muting sensors (side view and plan view)

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2-17

2Muting

2.4 Operating modes

2.4.4.2 Switch conditions in cross mode

Switch conditions in cross mode2-Muting_Betriebsarten_Kreuz-Muting-Schaltbedingungen

Muting On

Muting sensors MS1 and MS2 must be operated within the configured
simultaneity period.

Muting Off

The suspension of the safety function is lifted when one muting sensor
at most is still operated.

2.4.4.3 Diagnostic word

Diagnostic word2-Muting_Betriebsarten_Muting-Diagnosewort

Messages can be queried in the PNOZmulti Configurator in bit mode
and linked further within the program.

 Bit 1: Light curtain, interrupted (without active muting)
 Bit 2: Waiting for reset (reset)
 Bit 3: Sensor status unfeasible, override required
 Bit 8: Muting time exceeded
 Bit 9: Feasibility error, simultaneity period exceeded on muting sen-

sors 1 and 2, only one sensor operated

2-18

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2Muting

1
0

1

Reset

1
0

1
0

1
0

1
0

1
0

32

4

MS1

MS2

Mut i ng

Ena bl e

AOPD

t

sync

t

sync

t

MUT

2.4 Operating modes

2.4.4.4 Timing diagram (example)

Timing diagram (example)2-_Dummy-Vorlage

Key:
t

= Simultaneity

sync

= Muting time

t

MUT

: Set enable with reset
: Start muting via MS1/MS2
: End muting by clearing MS1 or MS2
: Restart muting via MS1/MS2

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2-19

3 Safety Mat/Safe Edge

3.1 Introduction

33000Safety Mat/Safe EdgeSafety Mat/Safe Edge3-3.1Introduction3100In troduction3-Schaltmatte_Einführung

This chapter describes the use of pressure-sensitive protective devices
(safety mats and safe edges) with the PNOZmulti.

Please refer to the following:

 The operating manuals provided with the PNOZmulti units
 The PNOZmulti technical catalogue
 The certificate showing approved pressure-sensitive protective de-

vices

 The installation manual and user information provided by the safety

Schaltmatte_Definition

mat/safe edge manufacturer (see "Intended use").

Safety mat

A safety mat is a protective device which detects a person standing on
it or stepping on to it. The safety mat comprises a sensor which re­sponds to the application of pressure, a control unit and an output signal
switching device.

With a safety mat, the effective sensing area is deformed locally when
the sensor is operated.

Safe edge

A safe edge is a protective device which is designed to detect contact
from a person or any part of a person's body. It comprises:

 A sensor, which generates a signal when pressure is applied to part

of its surface, whereby:
– Its length is greater than its width
– Its cross section is constant across its length
– Cross-sectional width is greater than 8 mm
– The effective sensing area is deformed locally to actuate the sensor

 A control unit that responds to a signal from the sensor and generates

an output signal that it sends to the machine control system.

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3-1

3 Safety Mat/Safe Edge

3.2 Safety

3.2Safety3200Safety3-

3.2.1 Intended use

Intended use3-Schaltmatte_Sicherheit_ Bestimmungsgemäße Ver wendung

Base units from the configurable control system PNOZmulti and PNOZ­multi Mini plus the expansion module PNOZ mi1p are suitable for con­necting pressure-sensitive protective devices.

 The units may only be used as a safety system in conjunction with the

approved pressure-sensitive protective devices (see certificate show­ing approved pressure-sensitive protective devices).

 The pressure-sensitive protective devices must be connected to the

inputs on the PNOZmulti units via the PSEN im1 interface or type
1N4007 diodes (see "Commissioning the safety system").

 Only pressure-sensitive protective devices without installed terminat-

ing resistors are suitable.

 The following are not permitted: Walking aids such as canes and

wheeled vehicles

 The configurable control system PNOZmulti is used as a control unit

and as an output signal switching device in accordance with
EN 1760-1, 09/97.

3.2.2 Safety guidelines

Safety guidelines3-Schaltmatte_Sicherheit_ Sicherheitshinwe ise

CAUTION!

When pressure-sensitive protective devices are connected to
PNOZmulti units, the units (including the coated version) may
only be operated at an ambient temperature of 0 to +60 °C.

Do not install and commission the safety system until you have read and
understood this chapter, the technical catalogue and the installation
manual from the safety mat/safe edge manufacturer.

You must also be familiar with the applicable regulations for health and
safety at work and accident prevention.

 In particular you should refer to EN 1760-1 and EN 1760-2.
 In terms of faults the safety system complies with Category 3, PL d of

EN ISO 1349-1 and SIL CL 2 of EN IEC 62061. With the safety mat
it's important to consider Note 3 to Clause 4.15 of EN 1760-1

 The categories for safety mats on machines in accordance with EN

13849-1 are specified in type C standards.

3-2

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3 Safety Mat/Safe Edge

3.3 Function description

3.3Function description3300Function description3-Schaltmatt e_Funktionsbesch reibung

The pressure-sensitive safety device is supplied with PNOZmulti test
pulse outputs. The test pulses are evaluated by PNOZmulti inputs (see
section titled "Commissioning the safety system"). Short across con­tacts and open circuits are detected.

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3-3

3 Safety Mat/Safe Edge

3.4 Configuration in the PNOZmulti Configurator

3.4Configuration in the PNOZ multi Configurator3400Configurat ion in the PNOZmulti C onfigurator3-Schaltmatte_Konfiguration

 Operating modes

– Automatic reset (start):

After the pressure-sensitive protective device has been activated,
the output immediately returns to "1" once the pressure-sensitive
protective device is cleared.

– Manual reset (start):

The output does not return to "1" until the reset button has been
pressed. This eliminates the possibility of the reset button being
overridden, triggering automatic activation. A reset is only possible
if the pressure-sensitive protective device is not activated.

 Start-up test

The start-up test prevents an automatic restart after a power failure
and subsequent return of voltage. The unit checks whether the non­activated pressure-sensitive protective device was activated and
cleared after supply voltage was applied.

 The output of the pressure-sensitive protective device function ele-

ment is "1" if the pressure-sensitive protective device has not been
activated. This safety function must be retained when this signal is
linked further within the PNOZmulti Configurator:
– Semiconductor outputs: High signal
– Relay outputs: Safety contacts closed

3.4.1 Allocation of test pulses to inputs

Allocation of test pulses to inputs3-Schaltmatte_Konfiguration- Zuordnung zu den Eing ängen

The test pulses can only be connected to the inputs as follows:

Input 1: Test pulse T0
Input 2: Test pulse T1

or

Input 1: Test pulse T2
Input 2: Test pulse T3

INFORMATION

Test pulses that you use for the pressure-sensitive protective
device cannot be reused for test pulses in conjunction with other
safety devices.

3-4

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3 Safety Mat/Safe Edge

3.5 Commissioning the safety system

3.5Commissioning the safety system3500Commissioning the safety system3-Schaltmatt e_Sicherheitssyste m in Betrieb nehmen- einleitung

When using the pressure-sensitive protective device, please note the
following:

 The following are not permitted: Walking aids such as canes and

wheeled vehicles

3.5.1 Preparing for commissioning

Preparing for commissioning3-Schaltmatte_Sicherheits system in Betrieb ne hmen-vorbereiten

Please note the following when preparing for commissioning:

 Cables that have to be laid outside the control cabinet must be pro-

tected from mechanical damage, e.g. by installing them in a conduit.

 Pressure-sensitive protective devices may not be fitted with a termi-

nating resistor.

 The configured test pulse outputs should be used exclusively for test

pulses on the pressure-sensitive protective devices. Be sure to note
the information provided in "Technical details".

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3-5

3 Safety Mat/Safe Edge

T0/T2

T1/T3

I0
I1

PNOZmulti

PSEN im1

1.2

1.1

5.2

5.1

2

1

...

T0/T2

T1/T3

I1

I0

I3

I2

PSEN im1

1.2

1.1

5.2

5.1

2

1

PNOZmulti

1 ... max. 5

...

...

...

3.5 Commissioning the safety system

3.5.2 Preparing for operation

Preparing for operation3-Schaltmatte_Sicherheitssystem in Betrieb nehmen-betriebsbereitschaft herstellen

Input circuit
Connecting one pressure-sensitive protective device,

max. area of pressure-sensitive protective device = 8 m

 Connect the pressure-sensitive protective device to the test pulse

outputs and the inputs (in examples I0 to I3).

 Please note:

Always connect the pressure-sensitive protective devices to the
PNOZmulti units via
– interface PSEN im1,
– diodes of type 1 N4003 ...1N4007,
– or via the terminal block with filter, order no. 774 195, 774 196.

0 V may not be connected to the terminal block!

2

3-6

Connecting multiple pressure-sensitive protective devices,
permitted per dual-pole input: max. 5 pressure-sensitive
protective devices in series, max. area of pressure-sensi­tive protective device = 8 m

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2

3 Safety Mat/Safe Edge

I5

S3

24 V DC

3.5 Commissioning the safety system

 Set the reset features through wiring of the reset circuit (in example

I5). Only effective if
PNOZmulti Configurator.

Manual reset

manual reset

is configured in the

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3-7

3 Safety Mat/Safe Edge

3.6 Operation

3.6Operation3600Operation3-_Dummy-Vorlage

The safety system can only be started if the pressure-sensitive protec­tive device has not been activated. The unit detects the operating mode
set on start-up.

3.6.1 Diagnostic word

Diagnostic word3-Schaltmatte-Diagnosewort

Messages can be queried in the PNOZmulti Configurator in bit mode
and linked further within the program.

 Bit 0: Pressure-sensitive protective device clear, enable issued
 Bit 2: Pressure-sensitive protective device activated
 Bit 3: Waiting for reset
 Bit 4: Waiting for start-up test
 Bit 6: Open circuit detected, signal error

3-8

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3 Safety Mat/Safe Edge

3.7 Technical Details

3.7Technical Details3700Technical Details3-Technische Daten

Technical details

Reaction time (from activation of the pressure-sensitive protective de­vice until an instantaneous safety output drops out)*

Max. area of pressure-sensitive protective devices per dual-pole input 8 m
Max. number of pressure-sensitive protective devices connected in se-

ries per dual-pole input
Min. cross section of external conductor 0.5 mm
Max. cable length, PNOZmulti - pressure-sensitive protective device 100 m
Max. resistance of safety mat/safe edge 150 Ohm

*The stated reaction time is the maximum value for pressure-sensitive
protective devices. For details of the specific reaction time in conjunc­tion with the respective approved safety mat or safe edge, please refer
to the certificate showing approved pressure-sensitive protective devic­es.

< 200 ms

2

5

2

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3 Safety Mat/Safe Edge

3-10

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4Burners

4.1 Introduction

44000BurnersBurners4-4.1Intro duction4100Introduc tion4-Einführung

This chapter describes how to control and monitor burners with the base
units PNOZ m3p from the configurable control system PNOZmulti.
Control and monitoring of a burner is configured in the PNOZmulti Con­figurator using the burner element.

When using the burner element please also refer to:

 The operating manuals provided with the PNOZmulti units
 The online help for the PNOZmulti Configurator.

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4-1

4Burners

4.2 Safety

4.2Safety4200Safety4-

4.2.1 Intended use

Intended use4-Gertebeschreibung

The burner logic element can only be used in conjunction with the base
unit PNOZ m3p.
The burner logic element in the PNOZmulti Configurator is designed to
control and monitor burners in accordance with the standards:

 EN 298: Automatic gas burner control systems for gas burners and

gas burning appliances with or without fans

 EN 12953-7: Shell boilers
 EN 12952-8: Water-tube boilers and auxiliary installations
 EN 50156-1: Electrical equipment for furnaces
 EN 61508: SIL 3: Functional safety of safety-related electrical/elec-

tronic/programmable electronic systems

 EN 230: Automatic burner control systems for oil burners
 EN 267: Automatic forced draught burners for liquid fuels (draft)
 EN 298: Automatic gas burner control systems for gas burners and

gas burning appliances with or without fans

 EN 676: Automatic forced draught burners for gaseous fuels
 EN 746-2: Industrial thermoprocessing equipment
 EN 1643: Valve proving systems for automatic shut-off valves for gas

burners and gas appliances

The relay output module PNOZ mo5p has diverse relay outputs and is
therefore suitable for activating safety valves on a burner in accordance
with EN 50156.

4-2

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4Burners

4.3 Configuration in the PNOZmulti Configurator

4.3Configuration in the PNOZ multi Configurator4300Configurat ion in the PNOZmulti C onfigurator4-

4.3.1 Functions

Functions4-_Dummy-Vorlage

The burner logic element contains all the functions needed to control
and monitor burners.

These include
monitoring of

 Safety chains
 Combustion air pressure
 Ignition
 Flame monitoring
 External compound controller
 Tightness control

and control of:

 Safety valves
 Ignition valves
 Vent valve
 Ignition
 External compound controller
 Combustion air blower

The following oil and gas burner types can be controlled and monitored:

 Master burner with direct ignition
 Master burner with indirect ignition and joint flame monitoring
 Master burner with indirect ignition and separate flame monitoring
 Slave burner with direct ignition
 Slave burner with indirect ignition and joint flame monitoring
 Slave burner with indirect ignition and separate flame monitoring

The required burner type and necessary monitoring and control func­tions can be set in the PNOZmulti Configurator (see Monitoring func­tions/settings for the burner cycle). This will influence the burner cycle.

A burner cycle has several phases (steps). The configuration determines
which steps are carried out (see Burner cycle).

Provided the input signals match the set values within a step, the pro­gram cycle will be continued. The system will pass to the next step as
soon as the configured step time has elapsed.

If the input signals do not match the set values within a step, an error will
be detected. This will lead either to a fault lockout or a safety shutdown,
depending on the input signal and configuration.

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4-3

4Burners

4.3 Configuration in the PNOZmulti Configurator

4.3.2 Monitoring functions/settings for the burner cycle

Monitoring functions/se ttings for the bur ner cycle4-

4.3.2.1 Combustion air pressure monitoring, activating the combustion air blower, compound con-

Combustion air pressure monitoring, activating the combustion air blower, compound controller monitoring4-Funktionsbeschreibung_Ueberwachungen_Brennertyp

troller monitoring

You can set whether the activated burner is a master burner or a slave
burner.

 Master burners

Master burners have their own combustion air supply, which is con­trolled and monitored directly. The following monitoring/control func­tions are performed on master burners:

– The combustion air pressure is monitored. For this, the "AirP" input

must be linked to the device that monitors the required air amount

(generally an air pressure monitor).
– The combustion air blower is activated via the "BLOW" output.
– The compound controller can be activated and monitored. This is

necessary when an electronic compound controller is present (see

section below, entitled "Compound controller").

 Slave burners

Slave burners do not have their own combustion air supply. As a re­sult, no monitoring takes place. This burner type is used for multi­burners, for example, which are fitted with a central combustion air
supply and a monitoring function.

WARNING!
Loss of safety function due to incorrect use of the

ner

type

If the

Slave burner

type is used to avoid pre-purge and a com-

Slave bur-

bustion air supply is not guaranteed, serious injury or death may
result, depending on the application.
Only use the slave burner type if the combustion air supply is
guaranteed elsewhere.

Please also note the following with the

 The "AirP" input must be connected to a signal indicating the pres-

Slave burner

type:

ence of a central combustion air supply that is functioning correctly.
There is no check to ensure that this input is at rest position when the
burner is switched off.

 The burner cannot be started (signal at the "Start" input) until it is

guaranteed that there is no flammable mixture within the combustion
chamber or associated areas or within the exhaust system.

4-4

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4Burners

Safety valve 1

Safety valve 2

Ignition valve

4.3 Configuration in the PNOZmulti Configurator

4.3.2.2 Ignition

Ignition4-Funktionsbeschreibung_Ueberwachungen_Zuendung

The ignition transformer is activated via the "IGNT" output.

You can select two types of ignition in the PNOZmulti Configurator:

 Direct ignition

With direct ignition, no separate ignition burner is present. The main
burner is ignited directly via the ignition transformer.

 Indirect ignition

With indirect ignition, a separate ignition burner is present. The main
burner is ignited by an ignition flame, which is ignited via an ignition
transformer. Fuel may not be supplied to the main burner until the ig­nition burner has been ignited and the ignition flame is stable.
The ignition valve is activated via the IV output.
The following setting options are available for the behaviour of the ig­nition flame:

– Ignition valve is closed after ignition,

i.e. the ignition flame is to be extinguished once the main burner is

successfully ignited, or
– (only possible when separate flame monitoring is configured (see

section entitled "Flame monitoring")): Ignition valve remains open

after ignition,

i.e. the ignition flame is to stay lit once the main burner is success-

fully ignited.

The ignition valve must be positioned as follows:

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4-5

4Burners

4.3 Configuration in the PNOZmulti Configurator

4.3.2.3 Flame monitoring

Flame monitoring4-Funktionsbeschreibung_Ueberwachungen_Flammenueberwachung

Flame monitoring is used to establish and signal the presence of a flame.
To ensure that the signal is actually a result of the flame and not of some
external light source, the absence of the flame is monitored during a
burner cycle (e.g. during pre-purge). With direct ignition, the main flame
is monitored.
With indirect ignition you can select between two types of flame moni­toring:

 Joint flame monitoring

Ignition flame and main flame are monitored jointly. The FLAM input
for the main flame must be logically linked to flame monitoring. The
FLAI input for the ignition flame will not then be evaluated.

 Separate flame monitoring

Ignition flame and main flame are monitored separately; each have
their own flame monitoring device.

4.3.2.4 Compound controller

Compound controller4-Funktionsbeschreibung_Ueberwachungen_Verb undregelung

If master burners have an external electronic compound controller, the
compound controller must be activated and monitored via the burner el­ement

The compound controller controls and monitors the fuel/air ratio. The
regulating devices for the amount of combustion air and fuel are activat­ed for this purpose.

 The "PURG" output is activated during the step: "Compound control-

ler to pre-purge position". This output signal is intended to switch the
compound controller to the pre-purge position (maximum amount of
combustion air).

 During the steps "Pre-purge ...", a signal is expected at the "PUR" in-

put from the compound controller, indicating that the compound con­troller is in "pre-purge" position. This signal must not occur until the
airflow rate required for pre-purge is present.

 The "IGNI" output is activated during the step: "Compound controller

to ignition position". This output signal is intended to switch the com­pound controller to the ignition position (optimum fuel/air ratio for ig­nition).

 During the steps "Ignition ...", a signal is expected at the "IGN" input

from the compound controller, indicating that the compound control­ler is in "ignition" position. This signal must not occur until the opti­mum fuel/air ratio for ignition is present.

4-6

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4Burners

Safety valve 1

Safety valve 2

Vent valve

4.3 Configuration in the PNOZmulti Configurator

4.3.2.5 Tightness control

Tightness control4-Funktionsbeschreibung_Ueberwachungen_Dichtheitskontrolle

You can select whether to carry out tightness control. With tightness
control, the section between the two safety valves will first be vented,
then refilled and the pressure measured. The pressure is monitored at
the "GP" input.
The plant must undergo a hazard analysis to determine whether tight­ness control is necessary. The hazard analysis should also determine
whether venting is permitted via safety valve 2.

The following configuration options are available:

 Vent via the vent valve (the vent valve is activated via the VV output)

The vent valve must be positioned as follows:

or

 Vent via safety valve 2
 Continuous vent (in which case, tightness control is not carried out)
 No tightness control and no continuous vent

It's also possible to configure when tightness control is to be carried out:

 Tightness control prior to ignition
 Tightness control after the burner has shut down. (Even with this set-

ting, tightness control will be carried out prior to ignition if the previ­ous burner cycle was interrupted due to an error.)

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4-7

4Burners

4.3 Configuration in the PNOZmulti Configurator

4.3.2.6 High temperature

High temperature4-Funktionsbeschreibung_Ueberwachungen_Hochtemperatur

"High temperature" mode can be activated via the "HTmp" input if the
conditions for high temperature in high temperature plants have been
met in accordance with EN 746-2 and the fuel in the combustion cham­ber self-ignites safely.
As the fuel in the combustion chamber self-ignites in high temperature
mode, the burner cycle will change.

The following steps are no longer performed in high temperature mode:

 Any steps in connection with pre-purge and post-purge
 Tightness control
 Pre-ignition
 Afterburn

Flame monitoring is also deactivated; the outputs for activating "Com­pound controller for pre-purge position" (PURG) and the ignition trans­former (IGNT) are no longer activated.

WARNING!
Potential loss of safety functions in "High temperature"
mode!

If the conditions for high temperature in accordance with EN
746-2 are not met, safety-related steps in "High temperature"
mode will no longer be carried out. Depending on the applica­tion, serious injury or death may result.
Make sure that "High temperature" mode is only active when the
conditions for high temperature in accordance with EN 746-2
are met.

In any of the steps within the cycle, the "HTmp" input can be used to
switch between high temperature mode and normal mode (see also sec­tion entitled "Inputs and outputs").

4-8

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
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4Burners

4.3 Configuration in the PNOZmulti Configurator

4.3.2.7 Plant-dependent monitoring functions

Plant-dependent monitori ng functions4-Funktionsbeschreibung_Ueberwachungen_Sicherheitsketten

Plant-dependent monitoring functions, which are intended to trigger a
burner shutdown where necessary (e.g. when the temperature is too
high), must be incorporated into the safety sequences. In other words,
they must be linked to inputs CHA1, CHA2 or CHAi.

Monitoring functions which are intended to be active from burner start­up to burner shutdown must be linked to either CHA1 or CHA2.

Monitoring functions which are only intended to be active during ignition
and burner operation must be linked to CHAi (see also section entitled
"Inputs and outputs").

4.3.2.8 Shutdown types

Shutdown types4-Funktionsbeschreibung_Ueberwachungen_Abschaltungsarten

A controlled shutdown can be performed via the "Stop" input (e.g. if en­ergy is no longer required). The burner is then brought to a stop.

WARNING!
Loss of safety function due to incorrect use of the "Stop" in­put!

If the "Stop" input is used to reproduce a safety shutdown or
fault lockout, serious injury or death may result, depending on
the application.
Only use the "Stop" input for a controlled shutdown.

An error is detected if the input signals within a step do not match the
values set for the monitoring operation. This will lead either to a fault
lockout or a safety shutdown, depending on the input signal and config­uration. With both shutdown types, all outputs on the burner element are
shut down immediately and the sequence program is aborted.

 Safety shutdown

After a safety shutdown, the burner cycle is automatically restarted
after a configurable period, if there is no error present.

 Fault lockout

With a fault lockout, if there is no error present, it is necessary to reset
and then manually restart to enable a new burner cycle.

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
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4-9

4Burners

4.3 Configuration in the PNOZmulti Configurator

For the following steps you can select which shutdown type will occur
in the event of an error in the PNOZmulti Configurator:

 Safety chain 1 broken (input CHA1)
 Safety chain 2 broken (input CHA2)
 Ignition and operation safety chain broken (input CHAi)
 No air pressure during operation (during start-up: fault lockout)
 Faulty flame signal during operation (during start-up: fault lockout)

Please note:

The plant must undergo a hazard analysis to determine whether a safety
shutdown is permitted for an error.

4.3.2.9 Step times

Step times4-Funktionsbeschreibung_Ueberwachungen_Schrittzeiten

You can set a time for most of the steps within a cycle (see View burner
cycle, define step times). The time determines how long the step will be
active. While the step is active, the inputs must conform to the pre-de­fined set values. Once this time has elapsed, the next step will be started
(see also Burner cycle).

When configuring the step times, please note the following with the
steps below:

 Steps 5 - 9 "Pre-purge...)

The total duration of steps 5 - 9 for pre-purge must not be less than
the minimum duration for pre-purge calculated via the plant's hazard
analysis.

 Step 13 "Ignite ignition flame / 1st safety time"

The configured step time must not be longer than the 1st safety time.
The maximum duration of the 1st safety time is calculated based on
a hazard analysis of the plant.

 Step 15 "Ignite ignition flame / 2nd safety time"

The configured step time must not be longer than the 2nd safety
time. The maximum duration of the 2nd safety time is calculated
based on a hazard analysis of the plant.

4-10

A step time cannot be set for the following steps: "Burner switched off",
"Check start conditions" and "Burner in operation/control enable".

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

4Burners

4.4 Burner cycle

4.4Burner cycle44 00Burner cycle4-

4.4.1 Steps

Steps4-Funktionsbeschreibung_Schritte

Each step has a fixed step identifier (0 ... 31).
The steps are performed consecutively within the burner cycle (step 1
first, then step 2).
Some steps are only important internally and are not displayed (e.g. step

4). That's why some numbers from 0 to 31 are not listed as steps.
The length of the steps depends on the configuration and the burner cy­cle. There are steps for which you can set a step time in the PNOZmulti
Configurator; others have a fixed step time, or the step time depends on
the burner cycle.

A step time cannot be set for the following steps. They are run in each
burner cycle, irrespective of the configuration.

 Step 0: Burner switched off
 Step 1: Check start conditions
 Step 18: Burner in operation/controller enable

A step time can be set for the following steps. Your configuration will de­termine which of these steps are performed in your burner cycle.

 Step 2: Start-up combustion air blower
 Step 3: Compound controller to pre-purge position
 Step 5: Pre-purge/tightness control: Vent
 Step 6: Pre-purge/tightness control: Test air pressure
 Step 7: Prepurge/tightness control, filling:
 Step 8: Prepurge/tightness control, test fuel pressure
 Step 9: Continue pre-purge
 Step 10: Compound controller to ignition position
 Step 12: Pre-ignition
 Step 13: Ignite ignition flame/1st safety time
 Step 14: Stabilise ignition flame
 Step 15: Ignite main flame/2nd safety time
 Step 16: Stabilise main flame
 Step 17: Burner in operation/start position
 Step 20: Afterburn
 Step 21: Post-purge
 Step 22: Run down combustion air blower
 Step 24: Tightness control, vent
 Step 25: Tightness control, test air pressure
 Step 26: Tightness control, filling
 Step 27: Tightness control, test fuel pressure

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

4-11

4Burners

4.4 Burner cycle

4.4.2 Errors during the burner cycle

Errors during the burner cycle4-Funktionsbeschreibung_Schritte_Verhalten_im_Fehlerfall

An error is detected if the input signals within a step fail to match the val­ues set for the monitoring operation. This will lead either to a fault lock­out or a safety shutdown, depending on the input signal and
configuration. Some of the monitoring functions during a burner cycle
depend on the step, while others are continuous. In other words, some
monitoring processes occur in a specific step, while others may be ac­tive across the whole cycle.

 Step-dependent errors

With step-dependent errors, the set value of the input signals in the
various steps may vary.
E.g.: With combustion air monitoring, the input must have a "0" signal
during the "Check start conditions" step and a "1" signal during the
"Burner in operation" step.
The following monitoring functions have errors that depend on the

specific step:
– Combustion air monitoring
– Flame monitoring of ignition flame
– Flame monitoring of main flame
– Tightness control
– Compound controller not in pre-purge position
– Compound controller not in ignition position
– Ignition and operation safety chain

 Step-independent errors

Where errors are independent of the specific step, the same set value

applies for each step: The input must have a "1" signal.

The following monitoring functions have errors that are independent

of the specific step:
– Safety chain 1
– Safety chain 2

4-12

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

Inputs

CHA1

CHA2
CHAi
AirP
FLAM
PUR

IGN

GP

SV1
SV2

IV

VV

IGNT
BLOW
PURG

IGNI

STRT

CONT

Step
execution

mVB
oVB

UVa
UVe

01235678910121516171820212224252627

mVB
oVB

UZa
UZe

EE So

Sz

ES

So
Sz
So
Sz

kDK

Zz
Zo
EE
ES
kDK
DE

So
Sz

mVB
oVB
mVB
oVB
mVB
oVB

mVB DKv

DKn
kDK
DKv
DKn
kDK

oVB

Outputs

XXXXXXXXXXXXXXXXXX---­XXXX----XXXXXXXXXXXXXX
XXXX----XXXXXXXXXX---­XXX- XXXXX- XXX X- XXX---­XXX-----X-XXX XXXXXXXX
XXX-----X-XXX XXXX----

Configuration:

mVB: Cycle with compound controller
oVB: Cycle without compound controller
UZe: Monitoring of ignition conditions on
UZa: Monitoring of ignition conditions off
UVe: Monitoring of pre-purge conditions on
UVa: Monitoring of pre-purge conditions off
DE: Continuous vent
DKv: Tightness control prior to ignition
DKn: Tightness control after shutdown

Steps

Confi­guration

kDK: No tightness control,
no continuous vent
EE: Vent via vent valve
ES: Vent via safety valve 2
Zz: Ignition valve is closed after ignition
Zo: Ignition valve remains open after ignition
So: Safety valve 2 open during
afterburn
Sz: Closed

Status of inputs/outputs:

Signal must be/is '1'
No monitoring active
Signal must be/is '0'

Step execution

X-Step is executed

Step is not executed

-

-

4Burners

4.4 Burner cycle

4.4.3 Master burner with direct ignition

Master burner with direct ignition4-Brenner_Leitbrenner_mit_direkter_Zündung

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
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4-13

4Burners

Inputs

CHA1

CHA2
CHAi
AirP
FLAM

PUR

IGN

GP

SV1
SV2

IV

VV

IGNT
BLOW
PURG

IGNI

STRT

CONT

Step
execution

mVB
oVB

UVa
UVe

0123567891012 1516171820212224252627

mVB
oVB

UZa
UZe

EE So

Sz

ES

So
Sz
So
Sz

kDK

Zz
Zo
EE
ES
kDK
DE

So
Sz

mVB
oVB
mVB
oVB
mVB
oVB

mVB DKv

DKn
kDK
DKv
DKn
kDK

oVB

Outputs

XXXXXXXXXXX XXXXXXX---­XXXX----XXX XXXXXXXXXXX
XXXX----XXX XXXXXXX---­XXX- XXXXX- X XX- XXX---­XXX-----X-X XX- XXXXXXX
XXX-----X-X XX- XXX----

Configuration:

mVB: Cycle with compound controller
oVB: Cycle with compound controller
UZe: Monitoring of ignition conditions on
UZa: Monitoring of ignition conditions off
UVe: Monitoring of pre-purge conditions on
UVa: Monitoring of pre-purge conditions off
DE: Continuous vent
DKv: Tightness control prior to ignition
DKn: Tightness control after shutdown

Steps

Confi­guration

kDK: No tightness control,
no continuous vent
EE: Vent via vent valve
ES: Vent via safety valve 2
Zz: Ignition valve is closed after ignition
Zo: Ignition valve remains open after ignition
So: Safety valve 2 open during
afterburn
Sz: Closed

Status of inputs/outputs:

Signal must be/is '1'
No monitorint active
Signal must be/is '0'

Step execution:

X-Step is executed

Step is not executed

FLAI Zz

Zo

13 14

X
X
X

X
X
X
XX
XX

XX

X
X
X

4.4 Burner cycle

4.4.4 Master burner with separate flame monitoring

Master burner with separate flame monitoring4-Brenner_Leitbrenner_mit_separater_Flammenueberwachung

4-14

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
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4Burners

Inputs

CHA1

CHA2
CHAi
AirP
FLAM
PUR

IGN

GP

SV1
SV2

IV

VV

IGNT
BLOW
PURG

IGNI

STRT

CONT

Step
execution

mVB
oVB

UVa

UVe

0123567891012 1516171820212224252627

mVB
oVB

UZa
UZe

EE So

Sz

ES

So
Sz
So
Sz

kDK

Zz
Zo
EE
ES
kDK
DE

So
Sz

mVB
oVB
mVB
oVB
mVB
oVB

mVB DKv

DKn
kDK
DKv
DKn
kDK

oVB

Outputs

XXXXXXXXXXX XXXXXXX---­XXXX----XXX XXXXXXXXXXX
XXXX----XXX XXXXXXX---­XXX- XXXXX X X XXX---­XXX-----X X X XXXXXXX
XXX-----X X X XXX----

Configuration:

mVB: Cycle with compound controller
oVB: Cycle without compound controller
UZe: Monitoring of ignition conditions on
UZa: Monitoring of ignition conditions off
UVe: Monitoring of pre-purge conditions on
UVa: Monitoring of pre-purge conditions off
DE: Continuous vent
DKv: Tightness control prior to ignition
DKn: Tightness control after shutdown

Steps

Confi­guration

kDK: No tightness control,
no continuous vent
EE: Vent via vent valve
ES: Vent via safety valve 2
Zz: Ignition valve is closed after ignition
Zo: Ignition valve remains open after ignition
So: Safety valve 2 open during
afterburn
Sz: Closed

Status of inputs/outputs:

Signal must be/is '1'
No monitoring active
Signal must be/is '0'

Step execution:

X-Step is executed

Step is not executed

13 14

X
X
X

X
X
X
X
X
X

X
X
X

-

-

-

X
X
X

X
X
X

-

-

-

4.4 Burner cycle

4.4.5 Master burner with joint flame monitoring

Master burner with joint flame monitoring4-Brenner_Leitbrenner_mit_gemeinsamer_Flammenueberwachung

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

4-15

4Burners

Inputs

CHA1

CHA2
CHAi
AirP
FLAM
IGN

GP

SV1
SV2

IV

VV

IGNT
CONT

Step
execution

015678121516182024252627

UZa
UZe

EE So

Sz

ES

So
Sz
So
Sz

kDK

Zz
Zo
EE
ES
kDK
DE

So
Sz

mVB DKv

DKn
kDK
DKv
DKn
kDK

oVB

Outputs

XXXXXXXXXXX ­XX - - XXXXXXX
XX - - XXX ­XXX XXX X X - -

-

XX - - - X XXX XX
XX --- X X

-

Configuration:

mVB: Cycle with compound controller
oVB: Cycle without compound controller
UZe: Monitoring of ignition conditions on
UZa: Monitoring of ignition conditions off
UVe: Monitoring of pre-purge conditions on
UVa: Monitoring of pre-purge conditions off
DE: Continuous vent
DKv: Tightness control prior to ignition
DKn: Tightness control after shutdown

Steps

Confi­guration

kDK: No tightness control,
no continuous vent
EE: Vent via vent valve
ES: Vent via safety valve 2
Zz: Ignition valve is closed after ignition
Zo: Ignition valve remains open after ignition
Safety valve 2 open during
Sz: afterburn
So: Closed

Status of inputs/outputs:

Signal must be/is '1'
No monitoring active
Signal must be/is '0'

Step execution:

X-Step is executed

Step is not executed

- -

-

---

-

-

--

X
X
X

X
X
X
X
X

X
X

X
X

-

-

--

-­X

4.4 Burner cycle

4.4.6 Slave burner with direct ignition

Slave burner with direct ignition4-Funktionsbeschreibung_Ablauf_Nicht_Leitbrenner_direkte_Zuendung

4-16

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
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4Burners

Inputs

CHA1

CHA2
CHAi
AirP
FLAM

IGN

GP

SV1
SV2

IV

VV

IGNT
CONT

Step
execution

015678121314151618202425

UZa
UZe

EE So

Sz

ES

So
Sz
So
Sz

kDK

Zz
Zo
EE
ES
kDK
DE

So
Sz

mVB DKv

DKn
kDK
DKv
DKn
kDK

oVB

Outputs

XXXXXX XXXXX ­XX - - XXXXXXX
XX - - XXX ­XXX XX X X X - -

-

XX - - - X XXX XX
XX --- X X

-

Configuration:

mVB: Cycle with compound controller
oVB: Cycle without compound controller
UZe: Monitoring of ignition conditions on
UZa: Monitoring of ignition conditions off
UVe: Monitoring of pre-purge conditions on
UVa: Monitoring of pre-purge conditions off
DE: Continuous vent
DKv: Tightness control prior to ignition
DKn: Tightness control after shutdown

Steps

Confi­guration

kDK: No tightness control,
no continuous vent
EE: Vent via vent valve
ES: Vent via safety valve 2
Zz: Ignition valve is closed after ignition
Zo: Ignition valve remains open after ignition
So: Safety valve 2 open during
afterburn
Sz: Closed

Status of inputs/outputs:

Signal must be/is '1'
No monitoring active
Signal must be/is '0'

Step execution:

X-Step is executed

Step is not executed

- -

-

-

-

-

-

-

--

X
X
X

X
X
X
X
X

X
X

X
X

-

-

--

-­X

26 27

FLAI Sz

So

X

X

X
X

X
X

X

X

X
X

X
X

4.4 Burner cycle

4.4.7 Slave burner with separate flame monitoring

Slave burner with separate flame monitoring4-Funktionsbeschreibung_Ablauf_Nicht_Leitbrenner_separate_Flammenueberw

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
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4-17

4Burners

Inputs

CHA1

CHA2
CHAi
AirP
FLAM
IGN

GP

SV1
SV2

IV

VV

IGNT
CONT

Step
execution

015678121314151618202425

UZa
UZe

EE So

Sz

ES

So
Sz
So
Sz

kDK

Zz
Zo
EE
ES
kDK
DE

So
Sz

mVB DKv

DKn
kDK
DKv
DKn
kDK

oVB

Outputs

XXXXXX XXXXX ­XX - - XXXXXXX
XX - - XXX ­XXX XX X X X - -

-

XX - - - X XXX XX
XX --- X X

-

Configuration:

mVB: Cycle with compound controller
oVB: Cycle without compound controller
UZe: Monitoring of ignition conditions on
UZa: Monitoring of ignition conditions off
UVe: Monitoring of pre-purge conditions on
UVa: Monitoring of pre-purge conditions off
DE: Continuous vent
DKv: Tightness control prior to ignition
DKn: Tightness control after shutdown

Steps

Confi­guration

kDK: No tightness control,
no continuous vent
EE: Vent via vent valve
ES: Vent via safety valve 2
Zz: Ignition valve is closed after ignition
Zo: Ignition valve remains open after ignition
So: Safety valve 2 open during
afterburn
Sz: Closed

Status of inputs/outputs:

Signal must be/is '1'
No monitoring active
Signal must be/is '0'

Step execution:

X-Step is executed

Step is not executed

- -

-

-

-

-

-

-

--

X
X
X

X
X
X
X
X

X
X

X
X

-

-

--

-­X

26 27

X

X

X
X

X
X

X

X

X
X

X
X

4.4 Burner cycle

4.4.8 Slave burner with joint flame monitoring

Slave burner with joint flame monitoring4-Funktionsbeschreibung_Ablauf_Nicht_Leitbrenner_gemeinsame_Flammenueberw

4-18

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4Burners

4.4 Burner cycle

4.4.9 Example: Viewing the burner cycle in the PNOZmulti Configurator

Example: Viewing the burner cycle in the PNOZmulti Configurator4-Funktionsbeschreibung_Ablauf_Beispiel

The steps listed above will be performed during the burner cycle, de­pending on the configuration.
Once you have made the settings for your configuration in the PNOZ­multi Configurator, you can then view the burner cycle. The following in­formation may be displayed:

 An overview of your configuration
 The steps that are performed with this configuration
 The set status of the inputs and the status of the outputs during the

respective steps

Example:
You have made the following settings in the PNOZmulti Configurator:

Burner type Master burner, indirect ignition, separate flame

monitoring

Cycle with compound
controller

Ignition valve Closed after ignition
Type of tightness control Vent via vent valve
Time of tightness control During pre-purge
Afterburn Safety valve 2 is closed during afterburn
Temperature Enable 'High temperature' operating mode

The following 2 tables are displayed in the PNOZmulti Configurator:

status of inputs

and

Activated

Status of outputs

Set

. Your own individual burner cy-

cle is represented in these tables.

The first row contains all the steps that will be performed during the
burner cycle (step identifiers 0 ... 31).
The first column contains all the inputs/outputs used in your application.

The field markings show the set status of the inputs and the status of the
outputs during the respective steps:

Black An input must = "1" in the step concerned, or an output = "1" in

the step concerned.

White An input or output must = "0" in the step concerned, or an out-

put = "0" in the step concerned.

Grey Monitoring of an input is deactivated in the step concerned, i.e.

it is not evaluated.

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4-19

4Burners

4.4 Burner cycle

Set status of inputs

Examples:

 In step 2, "Start-up combustion air blower", the safety chain must be

closed (input CHA2 = 1)

 In step 1, "Check start conditions", a main flame must not be detect-

ed (input FLAM = 0).

Status of outputs

4-20

Examples:

 In step 5 "Pre-purge/tightness control: Vent", the vent valve is activat-

ed (output VV = 1).

 In step 9 "Continue pre-purge", the ignition transformer is not activat-

ed (output IGNT = 0).

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]

4Burners

4.5 Inputs and outputs

4.5Inputs and outputs4500Inputs and outputs4-

4.5.1 Element's inputs

Element's inputs4-

4.5.1.1 Operation

Operation4-E/As_Eingänge_Bedienung

 Start: Switch burner on

The cycle is started via the start signal. The system can only be start­ed if no error is present.
Start = 0, no action
Start = 1, switch burner on (pulse edge 0 -> 1)

 Stop: Switch burner off

Shutdown of the burner is started via the stop signal.
Stop = 0, no action
Stop = 1, switch off burner

 Reset: Fault lockout/reset error

The reset input is used to cancel the restart interlock after a fault
lockout. A reset signal resets the cycle to "Burner switched off" sta­tus; the burner cycle can be restarted using the start signal.
Reset = 0, no action
Reset = 1, reset (pulse edge 0 -> 1)

4.5.1.2 Monitoring functions

Monitoring functions4-E/As_Eingänge_Überwachungen

 CHA 1: Safety chain 1

The inputs can be assigned to any signals. We recommend that you
connect E-STOP pushbuttons, which switch off the burner in an
emergency, or plant-dependent monitoring functions, such as tem­perature or pressure monitoring devices, for example.
CHA 1 = 0: Safety chain interrupted
CHA 1 = 1: Safety chain closed

 CHA 2: Safety chain 2

Safety chain 2 has the same function as safety chain 1. Both safety
chains are of equal value. They are differentiated to improve diagnos­tics.
CHA 2 = 0: Safety chain interrupted
CHA 2 = 1: Safety chain closed

 CHAi: Ignition and operation safety chain

This input has the same function as safety chains 1 and 2. However,
when there is a 0 signal, a fault lockout or safety shutdown will only
occur in between the steps Pre-ignition and Burner in operation, in­clusive. If the input has a 0 signal before or after this point, it will have
no effect.
CHAi = 0: Safety chain interrupted
CHAi = 1: Safety chain closed

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4-21

4Burners

4.5 Inputs and outputs

 AirP: Combustion air pressure monitoring

The combustion air pressure is monitored at this input.
AirP = 0: Combustion air pressure absent
AirP = 1: Combustion air pressure present
On slave burners it is assumed that the furnace is fitted with a central
combustion air supply. In this case, the "AirP" input must be con­nected to a signal indicating the presence of a correctly functioning
combustion air supply.

 FLAM: Flame monitoring of main flame

The main flame is monitored at this input. If a burner type with joint
flame monitoring is configured, this input will also be used to monitor
the ignition flame.
FLAM = 0: Flame absent
FLAM = 1: Flame present

 FLAI: Flame monitoring for ignition flame

If a burner type with separate flame monitoring is configured, this in­put will be used to monitor the ignition flame.
FLAI = 0: Ignition flame absent
FLAI = 1: Ignition flame present

 PUR: Compound controller in pre-purge position

At this input, a signal is expected from the compound controller, in­dicating that the compound controller is in "pre-purge" position. This
signal must not come from the compound controller until the airflow
rate required for pre-purge is present.
PUR = 0: Compound controller not in pre-purge position
PUR = 1: Compound controller in pre-purge position

 IGN: Compound controller in ignition position

At this input, a signal is expected from the compound controller, in­dicating that the compound controller is in "ignition" position. This
signal must not occur until the optimum fuel/air ratio for ignition is
present.
IGN = 0: Compound controller not in ignition position
IGN = 1: Compound controller in ignition position

 GP: Tightness control (gas pressure)

The pressure between the two safety valves is monitored at this in­put.
GP = 0: Section vented (atmospheric pressure)
GP = 1: Gas pressure present

 HTmp: High temperature mode

This input is used to switch between "Normal mode" and "High tem­perature mode". It is only possible to switch to high temperature
mode if
PNOZmulti Configurator.
HTmp = 0: Normal operation
HTmp = 1: High temperature

Allow "High temperature" mode

has been selected in the

4-22

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4Burners

4.5 Inputs and outputs

4.5.2 Element's outputs

Element's outputs4-E/As_Ausgänge

 SV1: Safety valve 1

Safety valve 1 is activated via this output. Safety valve 1 is on the fuel
side.
SV 1 = 0: Close safety valve 1
SV 1 = 1: Open safety valve 1
If the safety valves are activated via relay outputs, the special re­quirements of EN 50156 must be considered. We recommend that
the safety valves are activated via the PNOZmulti expansion module
PNOZ mo5p (see section entitled "Examples", under "Connecting
the safety valves").

 SV2: Safety valve 2

Safety valve 2 is activated via this output. Safety valve 2 is on the
burner side.
SV 2 = 0: Close safety valve 2
SV 2 = 1: Open safety valve 2
If the safety valves are activated via relay outputs, the special re­quirements of EN 50156 must be considered. We recommend that
the safety valves are activated via the PNOZmulti expansion module
PNOZ mo5p (see section entitled "Examples", under "Connecting
the safety valves").

 IV: Ignition valve

The ignition valve is activated via this output.
IV = 0: Close ignition valve
IV = 1: Open ignition valve

 VV: Vent valve

The vent valve is activated via this output. If tightness control is not
configured but continuous vent is, this valve must be designed to be
"normally open". If neither tightness control nor continuous vent is
configured, the output is inactive.
VV = 0: Close vent valve
VV = 1: Open vent valve

 IGNT: Ignition transformer

The ignition transformer is activated via this output.
IGNT = 0: Switch off ignition transformer
IGNT = 1: Switch on ignition transformer

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4-23

4Burners

4.5 Inputs and outputs

 BLOW: Combustion air blower

The combustion air blower is activated via this output.
BLOW = 0: Switch off combustion air blower
BLOW = 1: Switch on combustion air blower

 PURG: Compound controller to pre-purge position

This output is used to signal to the compound controller to go to pre­purge position.
PURG = 0: Compound controller not activated
PURG = 1: Compound controller to pre-purge position

 IGNI: Compound controller to ignition position

This output is used to signal to the compound controller to go to ig­nition position.
IGNI = 0: Compound controller not activated
IGNI = 1: Compound controller to pre-purge position

 STRT: Compound controller: Start position

This output is used to signal to the compound controller to go to start
position.
STRT = 0: Compound controller not activated
STRT = 1: Compound controller to start position

 CONT: Control enable

This output provides the signal for the control enable.
CONT = 0: No control enable
CONT = 1: Control enable

4-24

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4Burners

Safety valve 1

Safety valve 2

Vent valve

Ignition valve

Separate
flame monitoring

4.6 Configuration examples

4.6Configuration examples4600Configuration examples4-

4.6.1 Burner configuration

Burner configuration4-

4.6.1.1 Burner structure

Burner structure4-Brenneraufbau

4.6.1.2 Burner properties

Burner properties4-Brennereigenschaften

The burner has the following properties:

 The burner has its own combustion air supply.
 An electronic compound controller is present
 A separate ignition burner is present
 The ignition flame is extinguished once the main burner is successful-

ly ignited.

 Ignition and main flame are each monitored using their own flame

monitoring device.

 A tightness control check is carried out prior to ignition (during pre-

purge).

 With tightness control, the section between the two safety valves is

vented via the vent valve.

 Safety valve 2 is closed during afterburn.

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4-25

4Burners

4.6 Configuration examples

4.6.1.3 Configuration in the PNOZmulti Configurator

Configuration in the PNOZ multi Configurator4-Konfiguration im PNOZmulti Configurator

Select burner type

Burner properties Configuration

Own combustion air supply Master burner
Separate ignition burner Indirect ignition
Separate monitoring of ignition and main

flame

Separate flame monitoring

 Select

Master burner, indirect ignition, separate flame monitoring

Configure compound controller monitoring

Burner properties Configuration

Electronic compound controller present

Cycle with compound control­ler

Configure combustion air pressure monitoring

Burner properties Configuration

A bounce time must be stated for shutting
down the combustion air blower

Debounce time:

300 ms

Configure ignition

Burner properties Configuration

Ignition flame is extinguished once the
main burner is ignited

Ignition valve

Closed after ignition

Configure tightness control

4-26

Burner properties Configuration

Vent via vent valve Type of tightness control

Tightness control occurs prior to ignition Time of tightness control

Configure settings for shutting down the burner

Burner properties Configuration

Safety valve 2 is closed during afterburn.

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Vent via vent valve

Prior to ignition

Safety valve 2 is closed during
afterburn

4Burners

230 V AC

Interface

to previous

module

Interface

to next

module

O0

O1

13

23

14

24

O2

O3

33

43

34

44

4.6 Configuration examples

4.6.2 Connecting the safety valves

Connecting the safety valves4-Funktionsbeschreibung_Steuerung_Sicherheitsventile

If the safety valves are activated via relay outputs, diverse relays must
be used.

The relay output module PNOZ mo5p is intended for that purpose. This
module has 4 relay outputs:
Output O0 is diverse from O1,
Output O2 is diverse from output O3

Connecting the safety valves on a burner in accordance with EN
50156

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4-27

4Burners

4-28

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5 Loop formation (LOOP)

5.1 Introduction

55000Loop formation (LOOP)Loop formation (LOOP)5-5. 1Introduction5100Intro duction5-Schleifenbildung_Einführung

This chapter describes the "Loop formation" function, in which LOOP in­puts and outputs are configured in the PNOZmulti Configurator. This
function is available from Version 8.1.0 of the PNOZmulti Configurator.
Details of which base units support Version 8.1.0 are available in the
"Product Modifications" document in the "Version overview" section.

5.1.1 Intended use

Intended use5-Schleifenbildung_Bestimm_Verwendung

The loop formation (LOOP) function is used to feedback output informa­tion to the inputs.

NOTICE

When forming a loop, please note that the switch-off delay of the
connected output is increased (see section entitled "Function
description").

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5-1

5 Loop formation (LOOP)

5.2 Function description

5.2Function description5200Function description5-Schleifenbildung_Funktionsbeschreibung

The connection of an output to an input of the same element is detected
as an invalid loop in the PNOZmulti Configurator and cannot be config­ured in the user program.

Such a loop is necessary in certain applications. For example, applica­tions containing a step sequence, where the status of the previous step
influences the step that follows.

To meet this requirement you can configure a LOOP output and one or
more assigned LOOP inputs in the PNOZmulti Configurator.

The output information from the LOOP output is then made available to
the assigned LOOP inputs.

NOTICE

When forming a loop, please note that the presence of the out­put signal at the LOOP input is delayed by up to one cycle (15
ms); as a result, the switch off delay of the connected output is
increased by up to one cycle.

5-2

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5 Loop formation (LOOP)

5.3 Example configurations

5.3Example configurations5300Example configurations5-

5.3.1 Application using one loop

Application using one loop5-_Dummy-Vorlage

In the example configuration below, the status of the "LOOP 0" output
is made available one cycle later at the "LOOP 0" input. Logically, the
"Output 2" output switches one cycle later than the "Output1" output.

Calculating the switch-off delay of semiconductor output "Output
2" (a1.o1) when the E-STOP pushbutton is operated (a1.i0/a1.i1)

System's cycle time 15 ms
Switch-off delay of semiconductor output 30 ms
Number of loops 1

Switch-off delay of Output 2
= (Number of loops * Cycle) + Switch-off delay of semiconductor output
= (1*15 ms) + 30 ms
= 45 ms

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5-3

5 Loop formation (LOOP)

5.3 Example configurations

5.3.2 Application using two loops

Application using two loops5-_Dummy-Vorlage

In the example configuration, the status of the "LOOP 0" output is made
available one cycle later at the "LOOP 0" input. Logically, the "Output 2"
output switches one cycle later than the "Output1" output.

One more cycle later, the status of output "LOOP1" is made available at
the "LOOP1" input.
This means that the "Output 3" output switches 2 cycles later than the
"Output1" output.

5-4

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5 Loop formation (LOOP)

5.3 Example configurations

Calculating the switch-off delay of relay output "Output 3" (a1.o4/
a1.o4) when the E-STOP pushbutton is operated (a1.i0/a1.i1)

System's cycle time 15 ms
Switch-off delay of relay output 50 ms
Number of loops 2

Switch-off delay of Output 3
= (Number of loops * Cycle) + Switch-off delay of relay output
= (2*15 ms) + 50 ms
= 80 ms

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5-5

5 Loop formation (LOOP)

5-6

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...

1002337-EN-02, 2011-12 Printed in Germany

© Pilz GmbH & Co. KG, 2011

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Pilz GmbH & Co. KG
Felix-Wankel-Straße 2
73760 Ostfildern, Germany
Telephone: [phone]
Telefax: [phone]
E-Mail: [e-mail]
Internet: www.pilz.com

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