Pilz PSS SB NOT, Basic license User Manual
Programmable Safety Systems
PSS-Range
PSS Standard Function Blocks
MBS Emergency Stop Circuits
Version 2.2
Operating Manual
Item No. 19 227-08
The spirit of safety.
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Contents
Introduction 1-1
MBS Modular Block System 1-2
Categories / requirement classes 1-3
Overview of manual 1-4
Definition of symbols 1-5
Terminology 1-6
Overview 2-1
Software package 2-1
Range 2-2
Safety 3-1
Safety guidelines 3-1
Use of qualified personnel 3-1
Warranty and liability 3-1
Application guidelines 3-2
Standards 3-3
Fault detection 3-4
Fault detection techniques 3-5
Feasibility test 3-5
Pulsed input signals 3-6
Self test on the outputs 3-6
Fault prevention 3-6
Intended Use 4-1
System software 4-1
Intended use of the standard function blocks 4-2
SB060: Emergency stop monitoring 4-2
SB061: Emergency stop monitoring 4-2
SB062: Emergency stop monitoring 4-3
1Modular Block System: Emergency Stop Circuits
Contents
SB063: Emergency stop monitoring 4-3
SB065: Feedback loop monitoring 4-4
SB067: Feedback loop monitoring 4-5
SB070: Initialisation of administration data block (DB015) 4-6
SB071: Initialisation of administration data blocks
(DB015/DB016/DB017) 4-6
MBS Basics 5-1
Block design 5-1
Structure 5-1
Formal parameters and actual parameters 5-2
Administration data blocks DB015, DB016 and DB017 5-3
Structure of the administration data blocks 5-3
Blocks contained in the administration data blocks 5-5
Input parameter SSNR 5-7
Fault diagnostics 5-9
Error types 5-9
Fault diagnostics using the administration data blocks 5-10
Temporary flag range in MBS blocks 5-11
Output parameter FG/ENBL 5-11
Assignment of input and output parameters 5-12
Minimum scan time 5-12
Global parameters 5-13
Standard Function Blocks 6-1
Guidelines for selecting standard function blocks 6-1
Emergency stop monitoring 6-1
SB060 NA_KAT_2 6-1
SB061 NA_1 6-1
SB062 E-STOP 6-2
SB063 E-STOP 6-2
Feedback loop monitoring 6-3
SB067 RFK_K4 6-3
SB065 FBL 6-3
2
Modular Block System: Emergency Stop Circuits
Initialisation of administration data blocks 6-4
SB070 INIT_MBS 6-4
SB071 INIT_MBS 6-4
SB060: Emergency stop monitoring
Category 2 6-6
Block header 6-6
Input parameters 6-6
Output parameters 6-7
Error messages 6-7
Global parameters used in administration data block DB015 6-8
Blocks required 6-8
SB061: Emergency stop monitoring
Category 4 6-10
Block header 6-10
Input parameters 6-10
Output parameters 6-11
Error messages 6-11
Global parameters used in administration data block DB015 6-13
Blocks required 6-13
SB062: Emergency stop monitoring
Category 4 6-14
Block header 6-14
Input parameters 6-14
Output parameters 6-15
Function test 6-15
Error messages 6-16
Global parameters used in administration data block DB015 6-17
Blocks required 6-17
SB063: Emergency stop monitoring
Category 4 6-18
Block header 6-18
Input parameters 6-18
Output parameters 6-19
Function test 6-19
Error messages 6-20
Global parameters used in the administration data blocks 6-21
Blocks required 6-21
SB065: Feedback loop monitoring 6-22
Block header 6-22
Input parameters 6-22
3Modular Block System: Emergency Stop Circuits
Contents
Output parameters 6-23
Functions 6-24
Error messages 6-25
Global parameters used in the administration data blocks 6-27
Blocks required 6-27
SB067: Feedback loop monitoring 6-28
Block header 6-28
Input parameters 6-28
Output parameters 6-28
Error messages 6-29
Global parameters used in administration data block DB015 6-30
Blocks required 6-30
SB070: Initialisation of administration data block
DB015 6-32
Block header 6-32
Input parameters 6-32
Function 6-32
Error messages 6-34
Blocks required 6-34
SB071: Initialisation of administration data blocks 6-36
Block header 6-36
Input parameters 6-36
Function 6-36
Error messages 6-38
Blocks required 6-38
Link Blocks 7-1
Check list 7-1
Examples 8-1
Application and parameters of individual blocks 8-1
Emergency stop monitoring
with manual start (start-up and operation), category 2 8-2
Emergency stop monitoring
with automatic start (start-up and operation), category 2 8-4
4
Modular Block System: Emergency Stop Circuits
Emergency stop monitoring
with manual start (start-up and operation), category 4 8-6
Emergency stop monitoring
with automatic start-up, manual start (operation)
and function test, category 4 8-8
Feedback loop monitoring
Shutdown with two contactors connected in series,
category 4 8-10
Feedback loop monitoring
Shutdown with two main contactors connected in series and
pulsed outputs, category 4 8-12
Feedback loop monitoring (selective shutdown),
category 4 8-14
Emergency stop monitoring with monitoring of feedback loop,
category 4 8-18
Appendix 9-1
Assignment table
Category and requirement class 9-1
Standard function blocks: current versions 9-2
Changes to the standard function blocks 9-3
SB060: Emergency stop monitoring 9-3
SB061: Emergency stop monitoring 9-3
SB062: Emergency stop monitoring 9-4
SB063: Emergency stop monitoring 9-5
SB065: Feedback loop monitoring (RFK) 9-5
SB067: Feedback loop monitoring (RFK) 9-5
SB070: Initialisation of administration data block (DB015) 9-5
SB071: Initialisation of administration data blocks
(DB015/DB016/DB017) 9-6
Changes to the operating manual 9-6
Changes from Version 1.3 to Version 2.0 9-6
Changes from Version 2.0 to Version 2.2 9-6
5Modular Block System: Emergency Stop Circuits
Introduction
This manual describes how to manage the standard function blocks in the
“MBS Emergency Stop Circuits” software package in accordance with their
intended use.
Standard function blocks in the “MBS Emergency Stop Circuits” package
are part of the Pilz MBS Modular Block System. They can be used in the
failsafe section of a PSS-range programmable safety system.
To fully understand this manual you will need to be conversant with the
information found in the general documentation for the PSS-range
(System Manual, Installation Manual for the modular/compact PSS, PSS
SW PG Programming Manual/PSS WIN-PRO Programming Manual).
In particular you should refer to the following documents from the System
Manual:
• Safety Manual
• FS System Description
• Error List
To fully understand the bus-specific requirements and correlations for
SafetyBUS p applications you will need some knowledge of the design and
management of SafetyBUS p.
Knowledge of the safety regulations for the particular area of application is
assumed.
This installation manual is intended for instruction and should be retained
for future reference.
1-1Modular Block System: Emergency Stop Circuits
Introduction
MBS Modular Block System
Safety-related areas can be equipped with a multitude of safety devices
such as E-STOPs, safety gates, light barriers etc. Safety devices are
required in various quantities and combinations, depending on the object
requiring protection. The Pilz MBS Modular Block System was developed
to drive the various safety devices and to carry out process engineering
functions, helping users to save time and money.
The MBS consists of individual standard function blocks (SBs), which are
geared specifically towards the relevant safety device or process
engineering function. It allows standard function blocks to be used in any
combination. The standard function blocks can be combined in any
sequence (max. 600).
Standard function blocks are encoded by an authorised body so that they
cannot be modified. If an encoded standard function block is used within
an application program, program testing may be restricted to the new parts
of the program, considerably reducing the test time.
1-2
Modular Block System: Emergency Stop Circuits
Categories / requirement classes
EN 954-1 divides safety devices into categories.
All standard function blocks are designed for the highest category
permitted for the safety device to be monitored. If safety devices with lower
categories are to be monitored, input parameters may be assigned
identical inputs (further information can be found in the description for the
relevant standard function block).
In process engineering, safety requirements must conform to DIN V 19250
(Basic Safety Requirements for Measurement and Control Protection
Devices).
Requirement classes in accordance with DIN V 19250 may be referred to
the categories as per EN 954-1. The Appendix contains a table showing
the assignment of category ↔ requirement class.
1-3Modular Block System: Emergency Stop Circuits
Introduction
Overview of manual
1 Introduction
The chapter you are reading provides an introduction to the Modular
Block System (MBS). It is designed to familiarise you with the
contents, structure and specific order of this manual and also contains
terminology definitions.
2 Overview
This chapter provides information on the most important features of
the software package and provides a brief overview of the application
range.
3 Safety
This chapter must be read as it contains important information on
safety regulations.
4 Intended Use
This chapter must be read as it contains information on intended use.
5 MBS Basics
This chapter explains the basic functions and safety requirements of
the MBS.
6 Standard Function Blocks
This chapter explains the function of the standard function blocks in
the software package.
7 Link Blocks
This chapter is designed to help you link the standard function blocks
into your project and to commission the safety functions.
8 Examples
This chapter is designed to give an overview of how the standard
function blocks may be applied and contains typical application
examples.
9 Appendix
The Appendix contains a table that explains the relationship between
categories and requirement classes, plus a list that documents the
current version status of the standard function blocks.
1-4
Modular Block System: Emergency Stop Circuits
Definition of symbols
Information in this manual that is of particular importance can be 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 product or devices in its immediate
environment could be damaged. It also provides information on preventive
measures that can be taken.
INFORMATION
This gives advice on applications and provides information on special
features, as well as highlighting areas within the text that are of particular
importance.
1-5Modular Block System: Emergency Stop Circuits
Introduction
Terminology
• The term “input” is frequently abbreviated to “I” (e.g. I-Parameter).
• The term “output” is frequently abbreviated to “O” (e.g. O-Parameter).
• The term “PSS” is always used when the description is valid for all
applicable PSS programmable safety systems. If the description only
relates to a specific PSS series, the specific name for that series will be
used (e.g. PSS 3000 or PSS SB 3056).
• In this manual, the system software “PSS SW PG” and “PSS WIN-PRO”
is referred to as “programming device” or “PG”.
1-6
Modular Block System: Emergency Stop Circuits
Overview
Software package
The “MBS Emergency Stop Circuits” software package is part of the Pilz
MBS Modular Block System. The software package contains all the
standard function blocks necessary for electronically-monitored safety
devices on distributed automation plants. This includes:
• Evaluation of E-STOP buttons, grab wires etc.
• Monitoring safety, maintenance and supply gates
Standard function blocks in the “MBS Emergency Stop Circuits” software
package are used in the failsafe section of a PSS-range programmable
safety system.
Range
The software package consists of:
• The files for the software package on CD and
• An operating manual:
PSS Standard Function Blocks MBS Emergency Stop Circuits, Version
2.0
The software package on the CD contains the following standard function
blocks:
• SB060 NA_Kat_2
Monitoring E-STOP button up to category 2 in accordance with
EN 954-1, 03/97 and AK 3 in accordance with DIN V 19 250,
01/89
(approved safety block)
• SB061 NA_1
Monitoring E-STOP button up to category 4 in accordance with
EN 954-1, 03/97 and AK 6 in accordance with DIN V 19 250,
05/94
(approved safety block)
• SB062 E-STOP
Monitoring E-STOP button up to category 4 in accordance with
EN 954-1, 03/97 and AK 6 in accordance with DIN V 19 250,
05/94
(approved safety block)
2-1Modular Block System: Emergency Stop Circuits
Overview
• SB063 E-STOP
Monitoring E-STOP button up to category 4 in accordance with
EN 954-1, 03/97 and AK 6 in accordance with DIN V 19 250,
05/94
(approved safety block)
• SB065 FBL
Feedback loop monitoring
(approved safety block)
• SB067 RFK_K4
Feedback loop monitoring
(approved safety block)
• SB070 INIT_MBS
Initialisation of the administration data block (DB015)
(approved safety block)
• SB071 INIT_MBS
Initialisation of the administration data blocks (DB015/DB016/
DB017)
(approved safety block)
• SB255 System block
SB255 is described in the PSS System Description
2-2
Modular Block System: Emergency Stop Circuits
Safety
Safety guidelines
These safety guidelines are an important part of this manual. Failure to
keep to these guidelines will render all warranty, guarantee and liability
claims invalid.
• All health and safety / accident prevention regulations for the particular
area of application must be observed.
• Before using one or more of the standard function blocks in this software
package, you must perform a safety assessment in accordance with the
Machinery Directive.
Use of qualified personnel
The package may only be assembled, installed, commissioned, operated,
maintained and decommissioned by qualified personnel who, because
they are
• Qualified electrical engineers and/or
• Have received training from qualified electrical engineers
are suitably experienced to operate devices, systems, plant and machinery
in accordance with the general standards and guidelines for safety
technology.
Warranty and liability
All claims to warranty and liability will be rendered invalid if:
• Standard function blocks are used contrary to the purpose for which they
were intended
• Damage can be attributed to not having followed the guidelines in the
manual
• Operating personnel are not suitably qualified.
3-1Modular Block System: Emergency Stop Circuits
Safety
Application guidelines
• The instructions given in the “Safety Manual” and in the “Installation
Manual” must be followed.
• Please read the information in Chapter 4 regarding the intended use of
these blocks.
• The use of Pilz SBs does not detract from the fact that it is the
responsibility of the user to design appropriate safety systems for plant,
machinery and software.
• It is the users' responsibility to determine their application requirements
by carrying out a detailed risk analysis, which should take into account
relevant regulations and standards, etc.
WARNING!
Please note: To achieve the corresponding category or requirement class,
the whole system including all safety-related components (parts, devices,
user program etc.) must be included in the assessment. For this reason,
Pilz cannot accept liability for the correct classification into a category or
requirement class.
3-2
Modular Block System: Emergency Stop Circuits
Standards
To use the SBs correctly you will need to have a good knowledge of the
relevant standards and directives. The following gives an overview of the
most important standards:
• E-STOP circuits EN 418
• Safety of machinery -
Two-hand controls EN 574
• Mechanical presses EN 692
• Hydraulic presses EN 693
• Hydraulic stamping and bending presses EN 12 622
• Machinery directive- basic terminology EN 292-1 and EN 292-2
• Printing and paper machinery prEN 1010
• Safety gates EN 1088
• Electrosensitive protective equipment EN 61 496-1
• Electrical equipment EN 60 204-1
• Machinery safety EN 954-1
• Basic Safety Requirements for Mea-
surement and Control Protection Devices DIN V 19 250
• Electrical equipment on firing plants prEN 50 156-1
Please note this is not an exhaustive list of safety standards and
directives.
3-3Modular Block System: Emergency Stop Circuits
Safety
Fault detection
The detection of errors and defects is an important function of the PSS, in
addition to pure control tasks.
Potential faults are subdivided into:
• Errors in the system hardware and wiring errors in the periphery units:
• Feasibility errors and functional errors in the process periphery units
- Errors in the system hardware are automatically detected and managed
by the PSS
- If test signals are used, wiring errors in the periphery units will
automatically be detected and managed by the PSS.
Users do not need to take this type of error into account within the
application program (additional information can be found in the PSS
“System Description”).
(input devices, actuators, wiring etc.).
These errors must be detected and managed through the PSS control
program.
WARNING!
It is particularly important to detect open circuits and shorts within the
safety circuits (e.g. two-hand, E-STOP etc.)
It is the responsibility of the user to select and apply an appropriate fault
detection system.
3-4
Modular Block System: Emergency Stop Circuits
Fault detection techniques
Various options are available to the user to help detect and rectify errors in
the process periphery units:
• Errors can be detected via the feasibility checks in the application proÂgram, e.g. by using redundant input devices.
• Errors can be detected by pulsing the signal lines using the test pulses
from the PSS DI2O T module.
• Errors can be detected by using the automatic tests in the output
modules.
• Avoid potential errors by using appropriate wiring.
Additional information on how to exclude potential errors can be found in
the directive VDI 2854 (safety requirements on automated manufacturing
systems).
Feasibility test
Redundant input devices for safety functions must undergo a feasibility
test within the application program.
Example:
A two-hand button has a N/C and a N/O contact. Once the application
program has detected the open N/C contact, it must check that the N/O
contact closes within an appropriate period of time. The function test
must be carried out for all possible combinations of the two contacts.
The plant must be stopped immediately if a feasibility error occurs. Similar
tests will also be required for other input devices.
If safety valves have feedback contacts, these must be evaluated
accordingly.
3-5Modular Block System: Emergency Stop Circuits
Safety
Pulsed input signals
Input devices for inputs with infrequent operation (e.g. E-STOP, off
buttons, etc.) must be pulsed using test signals. The connection of test
pulses to input devices is described in the “Installation Manual”.
Test pulses should also be used for input devices which have an important
safety function and frequent operation (e.g. two-hand, camshaft etc.).
Self test on the outputs
PSS output modules regularly carry out function tests. Using these tests,
dual-pole switching output modules on the PSS are automatically able to
detect and deal with open circuits, short circuits and external power
sources in the periphery wiring.
Single-pole switching output modules can detect short circuits but not
open circuits.
Fault prevention
Not all potential faults can be detected and managed. Such faults must be
excluded by suitable wiring.
Example: If the feed to the input device and the feedback from the input
device to the input use the same multicore cable, a short circuit between
the two wires could short out the input device. Such a fault would go
undetected.
3-6
Modular Block System: Emergency Stop Circuits
Intended Use
The software package “MBS Emergency Stop Circuits” is designed for use
within the failsafe section of the PSS-range of programmable safety
systems.
INFORMATION
Use of standard function blocks outside the specifications described here
will be deemed improper use.
INFORMATION
Always use the current version of a standard function block. Please
ensure you refer to the Appendix, sections entitled “Standard function
blocks: current versions” and “Changes to the standard function blocks”.
System software
The software package “MBS Emergency Stop Circuits” can be used with
the following system software:
• PSS SW PG
• PSS WIN-PRO
INFORMATION
Depending on the programming language selected on PSS WIN-PRO,
designations for formal parameters and operands may differ from those
found on PSS SW PG. Any designations that are different will
automatically be replaced by PSS WIN-PRO .
Further information is available in the programming manual for “PSS SWÂPG” or “PSS WIN-PRO”.
4-1Modular Block System: Emergency Stop Circuits
Intended Use
Intended use of the standard function blocks
SB060: Emergency stop monitoring
SB060 is a standard function block for monitoring single-channel E-STOP
buttons up to category 2, in accordance with EN 954-1, 11/94 and AK 3, in
accordance with DIN V 19 250, 01/89. It is also possible to use SB 060 to
monitor safety gates and light barriers up to category 2, in accordance
with EN 954-1.
Operating modes:
• With or without start-up reset on cold-start
• With or without automatic reset when E-STOP is released
INFORMATION
Input circuitry:
• Use E-STOP button with test pulses
SB061: Emergency stop monitoring
SB061 is a standard function block for monitoring E-STOP buttons up to
category 4, in accordance with EN 954-1, 03/97 and AK 6, in accordance
with DIN V 19 250, 05/94. It is also possible to use SB061 to monitor
safety gates up to category 4, in accordance with EN 954-1, 03/97.
Operating modes:
• With or without start-up reset on cold-start
• With or without automatic reset when E-STOP is released
INFORMATION
Input circuitry:
• Use E-STOP button with test pulses
• When using SB061 for category 4 applications:
- use dual-channel elements
• When using SB061 for category 2 applications:
- use single-channel elements
4-2
Modular Block System: Emergency Stop Circuits
SB062: Emergency stop monitoring
SB062 is a standard function block for monitoring E-STOP buttons up to
category 4, in accordance with EN 954-1, 03/97 and AK 6, in accordance
with DIN V 19 250, 05/94. It is also possible to use SB 062 to monitor
safety gates up to category 4, in accordance with EN 954-1, 03/97.
Operating modes:
• With or without start-up reset on cold-start or on a SafetyBUS group
start
• With or without automatic reset when E-STOP is released
• With or without prompt for function test after a synchronisation error
when the E-STOP is released
INFORMATION
Input circuitry:
• Use E-STOP button with test pulses
• When using SB062 for category 4 applications:
- use dual-channel elements
• When using SB062 for category 2 applications:
- use single-channel elements
SB063: Emergency stop monitoring
SB063 is a standard function block for monitoring E-STOP buttons up to
category 4, in accordance with EN 954-1, 03/97 and AK 6, in accordance
with DIN V 19 250, 05/94. It is also possible to use SB063 to monitor
safety gates up to category 4, in accordance with EN 954-1, 03/97.
INFORMATION
On SB063, the SSNR may lie in the range of 1 to 600.
Operating modes:
• With or without start-up reset on cold start or on a SafetyBUS p group
start
4-3Modular Block System: Emergency Stop Circuits
Intended Use
• With or without automatic reset when E-STOP is released
• With or without prompt for function test after a synchronisation error
when the E-STOP is released
INFORMATION
Input circuitry:
• Use E-STOP button with test pulses
• When using SB063 for category 4 applications:
- use dual-channel elements
• When using SB063 for category 2 applications:
- use single-channel elements
SB065: Feedback loop monitoring
SB065 is a standard function block for the direct control and monitoring of 1
or 2 contactors up to category 4, in accordance with EN 954-1, 03/97.
INFORMATION
On SB065, the SSNR may lie in the range of 1 to 600.
Features and application areas:
• Feedback loop is monitored during the change in the switch signal and
while the contactors are in a static condition.
• Feedback loop can be monitored on two separate feedback loops of
contactors connected in series
• Feedback loop can be monitored on two separate feedback loops of
contactors connected in parallel
• Feedback loop can be monitored on group contactors
• Selectable time for feedback loop monitoring
• Parameter to suppress error messages when an I/O-Group stops
(SafetyBUS p)
INFORMATION
Input circuitry:
4-4
• To achieve category 4, two independent shutdown routes must be
provided within the current path of the potentially dangerous drive
Modular Block System: Emergency Stop Circuits
• If wiring is to be laid outside the control cabinet, feedback loops must use
test pulses.
• Feedback loops must use test pulses if the possibility of a short-circuit
cannot be excluded.
• If only one contactor is used to switch a potentially dangerous drive, it
must be possible to switch this off via a group contactor within the
current path (selective shutdown).
• The group contactor must also be monitored through a feedback loop.
SB067: Feedback loop monitoring
SB067 is a standard function block for the direct control and monitoring of
contactors up to category 4, in accordance with EN 954-1, 03/97.
Features and application areas:
• Feedback loop is monitored during the change in the enable flag and
while the contactor is in a static condition.
• Feedback loop can be monitored on two separate feedback loops of
main contactors connected in series.
• Feedback loop can be monitored on group contactors.
INFORMATION
Input circuitry:
• To achieve category 4, two independent shutdown routes must be
provided within the current path of the potentially dangerous drive.
• If wiring is to be laid outside the control cabinet, feedback loops must use
test pulses.
• Feedback loops must use test pulses if the possibility of a short-circuit
cannot be excluded.
• If only one relay is used to switch a potentially dangerous drive, it must
be possible to switch this off via a group contactor located within the
current path (selective shutdown).
• The group contactor must also be monitored through a feedback loop.
4-5Modular Block System: Emergency Stop Circuits
Intended Use
SB070: Initialisation of administration data block (DB015)
SB070 is used to calculate the global parameters, depending on the set
minimum scan time (see also under “Minimum Scan Time” in Chapter 5).
The global parameters in administration data block DB015/DW1001 ... DW
1023 are initialised using SB070.
Function:
• Reads in the set minimum scan time from DB002 (configurator)
• Calculates the cycles based on the times transferred in the parameters
• Enters the calculated values into the administration DB.
SB071: Initialisation of administration data blocks (DB015/DB016/DB017)
SB071 is used to calculate the global parameters, depending on the set
minimum scan time (see also under “Minimum Scan Time” in Chapter 5).
Global parameters DW1001 ... DW1023 in administration data blocks
DB015, DB016 and DB017 are initialised using SB071.
Function:
• Reads in the set minimum scan time from DB002 (configurator)
• Calculates the cycles based on the times transferred in the parameters
• Enters the calculated values into the administration data blocks.
NOTICE
It is absolutely essential that SB071 is called in OB120 when using the
following standard function blocks:
• SB063 E-STOP
• SB064 S-GATE
• SB065 FBL
4-6
Modular Block System: Emergency Stop Circuits
MBS Basics
Block design
Structure
Safety-related areas can be equipped with a multitude of safety devices
such as (e.g. E-STOPs, safety gates, light barriers). These safety devices
are used in various quantities and combinations, depending on the object
requiring protection.
The Modular Block System (MBS) is made up of individual standard
function blocks. A standard function block is geared towards the
requirements of specific safety devices (e.g. monitoring an E-STOP
button, safety gate monitoring).
A standard function block must be assigned to each safety device in order
for it to be evaluated and monitored using the MBS. This procedure
enables any combination of individual safety devices to be evaluated and
monitored. The standard function blocks can be combined in any
sequence within the user program (max. 600).
One exception to this are standard function blocks used to drive and
monitor contactors or valves. For control engineering reasons, these
should be called up at the end of the user program.
5-1Modular Block System: Emergency Stop Circuits
MBS Basics
Formal parameters and actual parameters
Parameters can be set on the MBS standard function blocks. Formal
parameters are established in the block header. The user must assign a
corresponding actual parameter to each formal parameter. When the
standard function block is called up in the user program, the formal
parameters will be replaced by the user-specific actual parameters.
Formal parameter
PSS SW PG
PSS WIN-PRO: Pilz IL
X
B
W
D
Z
INFORMATION
Depending on the programming language selected on PSS WIN-PRO,
designations for formal parameters and operands may differ from those
found on PSS SW PG. Any designations that are different will
automatically be replaced by PSS WIN-PRO.
Actual parameter
PSS SW PG
PSS WIN-PRO: Pilz IL
Input bit E
Output bit A
Flag bit M
Input byte EB
Output byte AB
Flag byte MB
Constant KB
Input word EW
Output word AW
Flag byte MW
Constant KW
Data block DB
Timer or counter
5-2
Further information is available in the programming manual for “PSS SWÂPG” or “PSS WIN-PRO”.
Modular Block System: Emergency Stop Circuits
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