SIGMA TEK SNC 021 User manual

SNC 021
S-DIAS Safety
Incremental Encoder
Date of creation: 14.11.2017
Version date: 02.12.2019
Article number: 20-896-021-E

Publisher: SIGMATEK GmbH & Co KG
A-5112 Lamprechtshausen
Tel.: [phone]
Fax : [phone]
Email: [email protected]
WWW.SIGMATEK-AUTOMATION.COM
Copyright © 2017
SIGMATEK GmbH & Co KG
Translation from German
All rights reserved. No part of this work may be reproduced, edited using an electronic system, duplicated or
distributed in any form (print, photocopy, microfilm or in any other process) without the express permission.
We reserve the right to make changes in the content without notice. The SIGMATEK GmbH & Co KG is not responsible
for technical or printing errors in the handbook and assumes no responsibility for damages that occur through use
of this handbook.

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S-DIAS Safety SNC Incremental Encoder SNC 021
The S-DIAS Safety SNC incremental encoder module SNC 021 provides
the values of two incremental encoders, the Safety CPU as well as the non-
Safe CPU (standard PLC).
The two-channel safety function "monitors" the increments in the
incremental encoder interfaces and processes the so-called Safety core in
two micro controllers with cross-communication.
The incremental encoder function is monitored through a 2-channel
analysis of the encoder signals, with 2-channel error detection of each data
line, as well as via the measurement of the encoder supply voltages and
currents.
Speed, position, direction and acceleration are monitored via the Safe
application in the Safety CPU.
The module detects various error types, such as a cable break, cross-circuit
and inverted input signals.
The safety functions of the module meet
•for two-channel application
the requirements for SIL 3 or SIL CL 3 in accordance with EN / IEC 62061 and PL e,
Cat. 4 in accordance with EN ISO 13849-1/-2
as well as
•for one-channel application,
the requirements for SIL 2 or SIL CL 2 in accordance with EN / IEC 62061 and PL d,
Cat. 2 in accordance with EN ISO 13849-1/-2.

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Contents
1Basic Safety Guidelines..........................................................4
1.1 General Safety Information..........................................................4
1.2 Further Safety Guidelines............................................................5
1.3 General Requirements .................................................................6
2Conformity with EU Guidelines............................................11
2.1 Functional Safety Standards .....................................................11
2.2 EU Conformity Declaration........................................................11
2.3 Safety-Relevant Parameters ......................................................12
2.4 Compatibility ...............................................................................13
3Technical Data.......................................................................14
3.1 I-encoder Specifications ............................................................14
3.2 Electrical Requirements.............................................................14
3.3 Miscellaneous .............................................................................16
3.4 Environmental Conditions.........................................................16
4Mechanical Dimensions........................................................17
5Connector Layout..................................................................18
5.1 Status LEDs.................................................................................19
5.2 Applicable Connectors...............................................................20
5.3 Label Field ...................................................................................21
6Wiring.....................................................................................22

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6.1 Wiring Example...........................................................................22
6.2 Note..............................................................................................23
7RS422 Interface .....................................................................23
8Mounting................................................................................24
9Disposal .................................................................................25
10 Encoder Configuration .........................................................26
11 Installing the Encoder...........................................................28
12 Important Notes for Two-channel Application....................29
13 Supported Cycle Times ........................................................31
13.1 Cycle Times below 1 ms (in µs).................................................31
13.2 Cycle Times equal to or higher than 1 ms (in ms)...................31

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1 Basic Safety Guidelines
1.1 General Safety Information
Non-compliance with the Safety guidelines can result in danger to personnel, which could
then lead to serious injury or in worst cases, death. In less serious cases, systems and
equipment can be damaged.
The following symbols identify the individual risks as well as the degree of seriousness; their
respective meanings are briefly explained below. You should therefore familiarize yourself
with the Safety symbols and their meanings to prevent dangers and risks.
DANGER
DANGER
Identifies an immediate danger with high risk, which
can lead to immediate death or serious injury if not
avoided.
Indique un danger direct à haut risque d’un décès
immédiat ou des blessures graves si les consignes de
sécurité ne sont pas respectées.
WARNING
WARNING
Identifies a possible danger with a mid-level risk, which
can lead to death or (serious) injury if not avoided.
Indique un danger possible d’un risque moyen de
décès ou de (graves) blessures si les consignes de
sécurité ne sont pas respectées.
CAUTION
CAUTION
Identifies a low risk danger, which can lead to injury or
property damage if not avoided.
Indique un danger avec un niveau de risque faible des
blessures légères ou des dommages matériels si les
consignes de sécurité ne sont pas respectées.

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1.2 Further Safety Guidelines
Warning, dangerous electrical voltage
Avertissement d’une tension électrique dangereuse
Hot surface warning
Avertissement d’une surface chaude
Danger for ESD-sensitive components
This symbol identifies important or additional
information regarding the operation of the safety
modules.
Ce symbole indique des informations importantes ou
supplémentaires concernant le fonctionnement des
modules de sécurité particuliers.

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1.3 General Requirements
Technical
Documentation
This technical documentation is a component of this product.
•This document must be accessible near the machine,
since it contains important instructions.
•The technical documentation should be included in the
sale, rental or transfer of the product.
Documentation technique
Cette documentation technique fait partie intégrale du produit.
•Gardez la toujours à portée de main et à la proximité de
la machine, car elle contient des informations
importantes.
•Distribuez la documentation technique aux secteurs de
la vente et/ou de la location du produit.

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Acceptance of Safety
Guidelines
Before handling the product to which this documentation
belongs, the operating instructions and safety guidelines must be
read. SIGMATEK GmbH & Co KG accepts no liability for
damages resulting from non-compliance with the Safety
guidelines or applicable regulations.
Acceptance of the Safety guidelines and the explanations in this
document, as well as the Safety System Handbook (see
homepage1) are a basic requirement for proper use. Therefore,
read this operating manual thoroughly and familiarize yourself
with each of them in detail.
More information on standards and regulations etc. can be found
in the system handbook.
Prendre connaissance de consignes de sécurité
Avant toute manipulation on doit impérativement prendre
connaissance de consignes de sécurité et du mode d’emploi.
SIGMATEK GmbH & Co KG n'assume aucune responsabilité
pour les dommages causés par le non-respect des consignes de
sécurité ou du mode d’emploi respectif.
La connaissance de consignes de sécurité et le contenu de cette
documentation ainsi que le mode d’emploi du système de
sécurité constitue une condition préalable à l'utilisation prévue.
Lisez ce mode d’emploi et assurez-vous de le comprendre
jusqu’aux détails.
Pour plus d'informations sur les normes et les lignes directrices,
etc., reportez-vous au mode d’emploi
1
Using the search function with the keyword “Safety System Handbook”

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Qualified Personnel
Installation, assembly, programming and initial start-up,
operation, maintenance and decommissioning of control and
automation technology products in general, as well as safe
products in particular, can only be performed by qualified
personnel.
Qualified personnel in this context are people, who have
completed training or have trained under supervision of qualified
personnel and have been authorized to operate and maintain
equipment of functional safety, systems and facilities in
compliance with the strict guidelines and standards of Safety
technology.
Personnel qualifié
Installation, montage, programmation, mise en service,
l'exploitation, l'entretien et mise hors service de produits de
commande et d'automatisation en général, et de produits liés à
la sécurité, en particulier, ne peut être effectuée que par le
personnel qualifié.
On entend sous terme personnel qualifié les personnes ayant
acquis une formation professionnelle dispensé parun spécialiste
sur l’utilisation et surveillance des composants et des systèmes
de sécurité, ceci conformément aux lignes directrices et les
normes en vigueur.

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Designated Use
The Safety modules are designed for use in applications with a
requirement of functional safety and meet the required conditions
for Safe operation with the parameters specified in section 2.
For your own safety and the safety of others, use Safety modules
for their designated purpose only. Correct EMC installation as
well as proper transport and storage are also included under
designated use.
Non-designated use consists of:
•any change made to the Safety modules of any kind.
•the use of damaged Safety modules.
•the use of the Safety module inconsistent with the
instructions described in this handbook.
•The use of the safety module inconsistent with the
technical data described in this handbook.
Les modules de sécurité sont conçus pour une utilisation dans
les applications sollicitant un niveau de sécurité et répondent à
toutes les conditions nécessaires pour un fonctionnement sûr
conformément au niveau de performance e (PL e) selon la norme
EN ISO 13849-1/-2 et SIL 3 ou SIL CL 3 de la norme EN 62061.
Utilisation prévue
Utilisez le module de sécurité conformément à son mode
d’emploi pour votre propre sécurité et celle d'autres personnes.
L'utilisation conforme comprend également une installation
conforme CEM ainsi que le transport et le stockage conforme.
L'utilisation abusive comprend entre autres:
•Les modifications quelconques apportées aux modules
de sécurité.
•Utilisation de modules de sécurité endommagés.
•Utilisation de modules de sécurité en dehors du cadre
décrit dans ce mode d’emploi.
•Utilisation de modules de sécurité en dehors des
spécifications décrites dans ce mode d’emploi.

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Operator Due Diligence
The operator must ensure that
•the Safety modules are to be used for their designated
purpose only.
•the Safety modules are to be operated in error-free, fully
functional condition only.
•only sufficiently qualified and authorized personnel
operate the Safety modules.
This documentation is complete and in readable condition and
available at the site of operation.
Obligation de diligence
L’utilisateur doit s'assurer que
•les modules de sécurité ne sont utilisés que selon les
spécifications.
•uniquement les modules de sécurité en parfait état de
fonctionnement peuvent être utilisés.
•seulement le personnel qualifié et autorisé puisse
manipuler les modules de sécurité.
la documentation dans son intégralité et dans un état lisible est
mise à disposition à l’endroit où les modules de sécurité sont
utilisés.

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2 Conformity with EU Guidelines
2.1 Functional Safety Standards
- EN / IEC 62061:2005/A2:2015
- EN ISO 13849-1:2015
- EN ISO 13849-2:2012
2.2 EU Conformity Declaration
CE Declaration of Conformity
The SNC 021 complies with European norms for programmable logic
controls.
•2006/42/EG “Directive of the European Parliament and of the
Council of 17 May 2006 on Machinery and Change to the Directive
95/16/EC” (machine guideline)
•2014/30/EU “Electromagnetic Compatibility” (EMC guideline)
•2011/65/EU Restricted use of certain hazardous substances in
electrical and electronic equipment (RoHS Guideline)
The EU Conformity Declarations are provided on the SIGMATEK website.
Using the search function with the keyword “EU Declaration of Conformity”.

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2.3 Safety-Relevant Parameters
Input Module
2-channel application
Safety parameters for two
connected incremental encoders,
which monitor one another in the SNC
021
1-channel application
Safety parameters for one
connected incremental encoder, which
is monitored
in the SNC 021
SNC 021
including CPU modules
SCP 011/SCP 111
PFHD = 3.51E-09 (1/h)
MTTFD = 580 years
DC = 99.00 %
SFF = 99.63 %
PFHD=3.42E-09 (1/h)
MTTFD= 803 years
DC = 97.82 %
SFF = 99.57 %
PL e / CAT 4 according to EN/ISO 13849
SIL 3 according to EN 62061
PL d / CAT 2 according to EN/ISO 13849
SIL 3 according to EN 62061
The application for a specific PL,
category or SIL-CL requires a risk
analysis of the end-use application to
determine whether two incremental
encoders are sufficient.
These safety parameters were calculated
for the SNC 021 when used with a
incremental encoder. The safety
parameters of the entire machine must
be determined in the end application.
Reason for SIL 3 with single-channel use:
Because the high SFF value is greater than 99 %, SIL 3 can be accepted with a hardware
tolerance (HFT) of 0 according to EN 62061.
1-channel and 2-channel application:
The application for a specific PL, category or SIL-CL requires a correct
installation. Please note any normative requirements of the end application
(machine) for installation and selection of encoders.
The use of the specified parameters requires a risk analysis of the end
application, by which whether 2 incremental encoders is sufficient must be
determined.
For two-channel application, both incremental encoders must be monitored in
the application (SCP 011/111).

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2.4 Compatibility
Compatibility
For compatibility of the S-DIAS Safety modules, see chapter "Compatibility of
S-DIAS Safety Modules" in the system handbook.

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3 Technical Data
3.1 I-encoder Specifications
Number of channels
2
Encoder
Incremental encoder with RS422 Interface with null position trace.
Input frequency
0.75 MHz
Counter frequency
3 MHz
Signal analysis
4x
Encoder resolution
maximum 16 bits
Encoder power supply
+5 V supply, short-circuit proof with monitoring function
and current measurement (+5 V is generated from +24 V at X3)
Status LED
yes
I-encoder current consumption
maximum 300 mA per encoder
3.2 Electrical Requirements
Supply voltage for the encoder
supply
+18-30 V
Current consumption of supply
voltage for the encoder supply
typically 162 mA/24 V
maximum 200 mA/30 V
Voltage supply from Safety bus
+12 V
Current consumption on the
Safety bus (+12 V supply)
typically 75 mA
maximum 90 mA
Voltage supply from S-DIAS bus
+24 V
Current consumption on the
S-DIAS bus (+24 V supply)
typically 33 mA
maximum 40 mA

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If this S-DIAS Safety module is connected to an SCP with several modules, the total
current of the S-DIAS Safety modules used must be determined and checked.
The total current of the +24 V supply cannot exceed 800 mA.
The total current of the +12 V supply cannot exceed 800 mA.
Si ce module de sécurité S-DIAS Safety est raccordé à un SCP avec plusieurs
modules, le courant total des modules de sécurité S-DIAS utilisés doit être déterminé
et vérifié.
Le courant total de l'alimentation +24 V ne peut pas dépasser 800 mA.
Le courant total de l'alimentation +12 V ne peut pas dépasser 800 mA.
The SNC 021 module can only be used in conjunction with an
SCP 011/SCP 111 that has been configured as a master CPU.
Le module SNC 021 ne peut être utilisé qu'en combinaison avec un module
SCP 011/SCP 111 lequel a été configuré comme processeur maître.

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3.3 Miscellaneous
Article number
20-896-021
Hardware version
2.x-3.x
Standard
Two-channel application: EN 62061SIL 3 or SIL CL 3
EN ISO 13849-1 PL e/Cat. 4
One-channel application: EN 62061 SIL 2 or SIL CL 2
EN ISO 13849-1 PL d/Cat. 2
UL 508 (E247993)
Approvals
CE, CULUS
3.4 Environmental Conditions
Storage temperature
-20 ... +85 °C
Environmental temperature
0 ... +50 °C
Humidity
0-95 %, non-condensing
Installation altitude above sea
level
0-2000 m without derating
> 2000 m with derating of the maximum environmental temperature by 0.5
°C per 100 m
Operating conditions
Pollution degree 2
EMC resistance
in accordance with 61000-6-7:2015 (Generic standards - Immunity
requirements for equipment intended to perform functions in safety-related
systems (functional safety) at industrial locations)
in accordance with EN 61000-6-2:2007 (industrial area)
(increased requirements in accordance with IEC 62061)
EMC noise generation
in accordance with EN 61000-6-4:2007 (industrial area)
Vibration resistance
EN 60068-2-6
3.5 mm from 5-8.4 Hz
1 g from 8.4-150 Hz
Shock resistance
EN 60068-2-27
15 g
Protection type
EN 60529
IP20

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4 Mechanical Dimensions

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5 Connector Layout
The connections of the +24 V supply (X3: pin 1 and pin 2) or the GND supply (X3: pin
3 and pin 4) are internally bridged. To supply the module, only one connection to a
+24 V pin (pin 1 or pin 2) and a GND pin (pin 3 or pin 4) is required. The bridged
connections may be used for further looping of the +24 V supply and the GND
supply. However, it must be taken into account that a total current of 6 A per
connection is not exceeded by the forward looping!