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SCR P Safety Controller
Instruction Manual
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2020-07-14
BERNSTEIN AG. All rights reserved

Programmable Safety Controller SCR P
Contents
1 About This Document ..........................................................................................................................................................5
1.1 Important... Read This Before Proceeding! .........................................................................................................................................5
1.2 Use of Warnings and Cautions ..............................................................................................................................................................5
1.3 EU Declaration of Conformity (DoC) ....................................................................................................................................................5
2 Product Description ..............................................................................................................................................................7
2.1 Terms Used in this Manual ....................................................................................................................................................................7
2.2 Software ...................................................................................................................................................................................................7
2.3 USB Connections ....................................................................................................................................................................................7
2.4 Ethernet Connections ...........................................................................................................................................................................7
2.5 Internal Logic ...........................................................................................................................................................................................8
2.6 Password Overview ...............................................................................................................................................................................8
2.7 SCR P-PA Programming Tool ..............................................................................................................................................................8
3 SCR P Overview ......................................................................................................................................................................9
3.1 SCR P Models .........................................................................................................................................................................................9
3.2 SCR P Features and Indicators ............................................................................................................................................................9
3.3 SCR P Using FID 2 Safety Controllers ..................................................................................................................................................10
3.4 Input and Output Connections ..........................................................................................................................................................10
3.4.1 SCR P Safety and Non-Safety Input Devices ...................................................................................................................................10
3.4.2 SCR P Safety Relay Outputs ...............................................................................................................................................................10
3.4.3 SCR P Status Outputs and Virtual Status Outputs ..........................................................................................................................11
3.5 SCR P Automatic Terminal Optimization (ATO) Feature with External Terminal Blocks (ETB) ................................................11
4 Specifications and Requirements ..................................................................................................................................12
4.1 SCR P Specifications ............................................................................................................................................................................12
4.2 Dimensions .............................................................................................................................................................................................15
4.3 PC Requirements ..................................................................................................................................................................................15
5 System Installation ...............................................................................................................................................................16
5.1 Installing the Software ..........................................................................................................................................................................16
5.2 Installing the Safety Controller ............................................................................................................................................................16
5.2.1 Mounting Instructions ..........................................................................................................................................................................16
6 Installation Considerations ................................................................................................................................................17
6.1 Appropriate Application ......................................................................................................................................................................17
6.2 SCR P Applications ...............................................................................................................................................................................17
6.3 Safety Input Devices .............................................................................................................................................................................18
6.3.1 Safety Circuit Integrity and ISO 13849-1 Safety Circuit Principles ................................................................................................19
6.3.2 Safety Input Device Properties ............................................................................................................................................................20
6.4 Safety Input Device Options ................................................................................................................................................................22
6.4.1 Safety Circuit Integrity Levels ..............................................................................................................................................................23
6.4.2 Emergency Stop Push Buttons .........................................................................................................................................................23
6.4.3 Rope (Cable) Pull ..................................................................................................................................................................................24
6.4.4 Enabling Device .....................................................................................................................................................................................24
6.4.5 Protective (Safety) Stop .......................................................................................................................................................................24
6.4.6 Interlocked Guard or Gate .................................................................................................................................................................25
6.4.7 Optical Sensor .......................................................................................................................................................................................25
6.4.8 Two-Hand Control ................................................................................................................................................................................26
6.4.9 Safety Mat .............................................................................................................................................................................................28
6.4.10 Muting Sensor ........................................................................................................................................................................................31
6.4.11 Bypass Switch ........................................................................................................................................................................................32
6.4.12 Adjustable Valve Monitoring (AVM) Function ....................................................................................................................................33
6.4.13 DCD Inputs .............................................................................................................................................................................................34
6.5 Non-Safety Input Devices ....................................................................................................................................................................35
6.5.1 Manual Reset Input ...............................................................................................................................................................................36
6.6 Virtual Non-Safety Input Devices ........................................................................................................................................................37
6.6.1 Virtual Manual Reset and Cancel Delay (RCD) Sequence .............................................................................................................38
6.6.2 Virtual ON/OFF and Mute Enable .......................................................................................................................................................41
6.7 Safety Outputs .......................................................................................................................................................................................41
6.7.1 Safety Relay Outputs ............................................................................................................................................................................44
6.7.2 EDM and FSD Hookup .......................................................................................................................................................................44
6.8 Status Outputs ......................................................................................................................................................................................50
6.8.1 Status Output Signal Conventions ......................................................................................................................................................50
6.8.2 Status Output Functionality ..................................................................................................................................................................50
6.9 Virtual Status Outputs ...........................................................................................................................................................................51

Programmable Safety Controller SCR P
7 Getting Started .....................................................................................................................................................................52
7.1 Creating a Configuration ......................................................................................................................................................................52
7.2 Adding Inputs and Status Outputs ...................................................................................................................................................52
7.2.1 Adding Safety and Non-Safety Inputs ................................................................................................................................................52
7.2.2 Adding Status Outputs ........................................................................................................................................................................55
7.3 Designing the Control Logic ..............................................................................................................................................................56
7.4 Saving and Confirming a Configuration .............................................................................................................................................56
7.4.1 Notes on Confirming or Writing a Configuration to a Configured SCR P ......................................................................................57
7.5 Sample Configurations .........................................................................................................................................................................58
8 Software .................................................................................................................................................................................59
8.1 Abbreviations .........................................................................................................................................................................................59
8.2 Software Overview ...............................................................................................................................................................................61
8.3 Project Settings ......................................................................................................................................................................................63
8.4 Equipment Tab .....................................................................................................................................................................................64
8.5 Functional View Tab ............................................................................................................................................................................65
8.6 Logic Blocks ..........................................................................................................................................................................................66
8.7 Function Blocks ....................................................................................................................................................................................68
8.8 Wiring Diagram Tab ............................................................................................................................................................................87
8.9 Ladder Logic Tab .................................................................................................................................................................................88
8.10 DCD Tab ................................................................................................................................................................................................89
8.11 Industrial Ethernet Tab .......................................................................................................................................................................92
8.12 Configuration Summary Tab .............................................................................................................................................................97
8.13 Print Options .........................................................................................................................................................................................98
8.14 SCR P Password Manager ................................................................................................................................................................99
8.15 Viewing and Importing Controller Data .............................................................................................................................................99
8.16 Live Mode ............................................................................................................................................................................................101
8.17 Simulation Mode ..................................................................................................................................................................................104
8.18 Reference Signals ...............................................................................................................................................................................108
9 Industrial Ethernet Overview .........................................................................................................................................109
9.1 Configuring the Safety Controller ...................................................................................................................................................109
9.2 Industrial Ethernet Definitions ............................................................................................................................................................110
9.3 Retrieving Current Fault Information ................................................................................................................................................111
9.4 EtherNet/IP
™
........................................................................................................................................................................................111
9.4.1 Assembly Objects ..............................................................................................................................................................................111
9.4.2 Fault Examples ....................................................................................................................................................................................122
9.4.3 Flags ......................................................................................................................................................................................................123
9.4.4 Extended Flags ....................................................................................................................................................................................124
9.5 Modbus/TCP .......................................................................................................................................................................................124
9.5.1 Flags ......................................................................................................................................................................................................134
9.5.2 Extended Flags ....................................................................................................................................................................................135
9.5.3 Outputs from Safety Controller (Inputs to PLC) ..........................................................................................................................135
9.5.4 Inputs to Safety Controller (Outputs from PLC) ..........................................................................................................................143
9.5.5 Flags ......................................................................................................................................................................................................143
9.5.6 Extended Flags ....................................................................................................................................................................................144
9.6 PROFINET
®
..........................................................................................................................................................................................144
9.6.1 PROFINET and the Safety Controllers ............................................................................................................................................144
9.6.2 General Station Description (GSD) File ...........................................................................................................................................145
9.6.3 PROFINET IO Data Model .................................................................................................................................................................145
9.6.4 Configuring the Safety Controller for a PROFINET IO Connection .............................................................................................145
9.6.5 Description of Modules .....................................................................................................................................................................145
9.6.6 Configuration Instructions ..................................................................................................................................................................154
9.7 Temperature, Voltage, and Distance Conversion Information ......................................................................................................162
9.7.1 Supply Voltage .....................................................................................................................................................................................162
9.7.2 Internal Temperature ..........................................................................................................................................................................162
9.7.3 Actuator Distance ...............................................................................................................................................................................163
10 System Checkout ..............................................................................................................................................................165
10.1 Schedule of Required Checkouts ...................................................................................................................................................165
10.2 Commissioning Checkout Procedure ............................................................................................................................................165
10.2.1 Verifying System Operation ...............................................................................................................................................................165
10.2.2 Initial Setup, Commissioning, and Periodic Checkout Procedures ..............................................................................................166
11 Status and Operating Information ................................................................................................................................172
11.1 SCR P LED Status ..............................................................................................................................................................................172
11.2 Live Mode Information: Software ......................................................................................................................................................174
11.3 Lockout Conditions ............................................................................................................................................................................174
11.4 Recovering from a Lockout ..............................................................................................................................................................175
11.5 SCR P Using Automatic Terminal Optimization ..............................................................................................................................175
11.6 SCR P Example Configuration without Automatic Terminal Optimization ..................................................................................177
11.7 SCR P Using the SCR P-FPS ...........................................................................................................................................................181
11.8 Reset the Safety Controller to Factory Defaults ..........................................................................................................................182
11.9 Factory Defaults ..................................................................................................................................................................................182

Programmable Safety Controller SCR P
12 Troubleshooting ................................................................................................................................................................184
12.1 Software: Troubleshooting ...............................................................................................................................................................184
12.2 Software: Error Codes ......................................................................................................................................................................185
12.3 Verifying Driver Installation ................................................................................................................................................................186
12.4 Finding and Fixing Faults ...................................................................................................................................................................188
12.4.1 SCR P Fault Code Table ....................................................................................................................................................................188
13 Components and Accessories ......................................................................................................................................191
13.1 Replacement Parts and Accessories .............................................................................................................................................191
14 Product Support and Maintenance ..............................................................................................................................191
14.1 Cleaning ................................................................................................................................................................................................191
14.2 Repairs and Warranty Service ..........................................................................................................................................................191
14.3 Contact Us ...........................................................................................................................................................................................191
14.4 BERNSTEIN Software Copyright Notice ......................................................................................................................................191
15 Standards and Regulations ............................................................................................................................................192
15.1 Applicable European and International Standards .........................................................................................................................192
15.2 Applicable U.S. Standards .................................................................................................................................................................193
15.3 Applicable OSHA Regulations ...........................................................................................................................................................193
16 Glossary ................................................................................................................................................................................194

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1 About This Document
1.1 Important... Read This Before Proceeding!
It is the responsibility of the machine designer, controls engineer, machine builder, machine operator, and/or maintenance
personnel or electrician to apply and maintain this device in full compliance with all applicable regulations and standards.
The device can provide the required safeguarding function only if it is properly installed, properly operated, and properly
maintained. This manual attempts to provide complete installation, operation, and maintenance instruction. Reading the
manual in its entirety is highly recommended. Please direct any questions regarding the application or use of the device
to BERNSTEIN.
For more information regarding international institutions and U.S. that provide safeguarding application and safeguarding
device performance standards, see Standards and Regulations on p. 192.
1.2
Use of Warnings and Cautions
The precautions and statements used throughout this document are indicated by alert symbols and must be followed for
the safe use of the BERNSTEIN Safety Controller. Failure to follow all precautions and alerts may result in unsafe use or
operation. The following signal words and alert symbols are defined as follows:
Signal Word
Definition
Symbol
WARNING
Warnings refer to potentially hazardous situations which, if not
avoided, could result in serious injury or death.
CAUTION
Cautions refer to potentially hazardous situations which, if not
avoided, could result in minor or moderate injury.
These statements are intended to inform the machine designer and manufacturer, the end user, and maintenance
personnel, how to avoid misapplication and effectively apply the BERNSTEIN Safety Controller to meet the various
safeguarding application requirements. These individuals are responsible to read and abide by these statements.
1.3
EU Declaration of Conformity (DoC)
WARNING:
• The user is responsible for following these instructions.
• Failure to follow any of these responsibilities may potentially create a dangerous condition that
could result in serious injury ordeath.
• Carefully read, understand, and comply with all instructions for this device.
• Perform a risk assessment that includes the specific machine guarding application. Guidance on
a compliant methodology can be found in ISO 12100 or ANSI B11.0.
• Determine what safeguarding devices and methods are appropriate per the results of the risk
assessment and implement per all applicable local, state, and national codes and regulations.
See ISO 13849-1, ANSI B11.19, and/or other appropriate standards.
• Verify that the entire safeguarding system (including input devices, control systems, and output
devices) is properly configured and installed, operational, and working as intended for the
application.
• Periodically re-verify, as needed, that the entire safeguarding system is working as intended for
the application.

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2 Product Description
Safety control is a critical and required part of any safety system. This is because safety controllers ensure that your safety
measures 1) do not fail, or 2) if failure is inevitable, fail in a predictable safe way.
A safety controller is often an ideal safety control solution, because it provides more functionality than a safety relay, at a
lower cost than a safety PLC. In addition, a smart, scalable safety controller can expand with your needs as well as enable
remote monitoring of your machine safety systems.
BERNSTEIN Safety Controllers are easy-to-use, configurable, and designed to monitor multiple safety and non-safety input
devices, providing safe stop and start functions for machines with hazardous motion. The Safety Controller can replace
multiple safety relay modules in applications that include such safety input devices as E- stop buttons, interlocking gate
switches, safety light curtains, two-hand controls, safety mats, and other safeguarding devices. The Safety Controller may
also be used in place of larger and more complex safety PLCs with the use of additional input and/or output expansion
modules.
The onboard interface:
• Provides access to fault diagnostics
• Allows reading and writing the configuration file from and to the SCR P-FPS drives
2.1
Terms Used in this Manual
The following terms are used in this manual.
Safety Controller—an abbreviated version referring to the SCR P
SCR P —formal name of the SCR P product line
2.2
Software
The BERNSTEIN Safety Controller Software is an application with real-time display and diagnostic tools that are used to:
• Design and edit configurations
• Test a configuration in Simulation Mode
• Write a configuration to the Safety Controller
• Read the current configuration from the Safety Controller
• Display the real-time information, such as device statuses
• Display the fault information
The Software uses icons and circuit symbols to assist in making appropriate input device and property selections. As the
various device properties and I/O control relationships are established on the Functional View tab, the program
automatically builds the corresponding wiring and ladder logic diagrams.
See Software Overview on p. 61 for details.
2.3
USB Connections
The micro USB port on the Base Controller and the SCR P is used to connect to the PC (via the USB cable) and the SCR
P-FPS drive to read and write configurations created with the Software.
2.4
Ethernet Connections
Ethernet connections are made using an Ethernet cable connected from the Ethernet port of the Base Safety Controller
(Ethernet models only) or SCR P to a network switch or to the control or monitoring device. The Safety Controller supports
either the standard or crossover-style cables. A shielded cable may be needed in high-noise environments.
CAUTION: Potential for Unintended Ground Return Path
The USB interface is implemented in an industry standard way and is not isolated from the 24 V supply.
The USB cable makes it possible for the computer and safety controller to become part of an unintended
ground return path for other connected equipment. A large current could damage the PC and/or the
Safety Controller. To minimize this possibility, BERNSTEIN recommends that the USB cable is the only
cable connected to the PC. This includes disconnecting the AC power supply to a laptop whenever
possible. The USB interface is intended for downloading configurations and temporary monitoring or
troubleshooting. It is not designed for continuous use.

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2.5
Internal Logic
The Safety Controller’s internal logic is designed so that a Safety Output can turn On only if all the controlling safety input
device signals and the Safety Controller’s self-check signals are in the Run state and report that there is no fault condition.
The BERNSTEIN Safety Controller Software uses both Logic and Safety Function blocks for simple and more advanced
applications.
Logic Blocks are based on Boolean (True or False) logic laws. The following Logic Blocks are available:
• NOT
• AND
• OR
• NAND
• NOR
• XOR
• Flip Flop (Set priority and Reset priority)
See Logic Blocks on p. 66 for more information.
Function Blocks are pre-programmed blocks with built-in logic which provide various attribute selections to serve both
common and complex application needs. The following Function Blocks are available:
• Bypass Block
• Enabling Device Block
• Latch Reset Block
• Muting Block
• THC (Two-Hand Control) Block
• Delay Block
See Function Blocks on p. 68 for more information.
2.6
Password Overview
A password is required to confirm and write the configuration to the Safety Controller and to access the Password Manager
via the Software. See and SCR P Password Manager on p. 99 for more information.
2.7
SCR P-PA Programming Tool
Use the SCR P-FPS drives to store a confirmed configuration.
Click to access the programming tool options:
• Read—reads the current Safety Controller configuration from the SCR P-FPS drive and loads it to the Software
• Write—writes a confirmed configuration from the Software to the SCR P-FPS drive
• Lock—locks the SCR P-FPS drive preventing any configurations from being written to it (an empty drive cannot
be locked)
Note: You will not be able to unlock the SCR P-FPS drive after it has been locked.
Important: Verify that the configuration that is being imported to the Safety Controller is the correct
configuration (via the Software or writing on the white label on the SCR P-FPS drive).

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3 SCR P Overview
BERNSTEIN's SCR P configurable safety relay controller is an easy-to-
use and cost-effective alternative to safety relay modules. It replaces the
functionality and capability of two independent safety relay modules while
offering the configurability, simplicity, and advanced diagnostics
capabilities offered by the rest of the BERNSTEIN Safety Controller line-
up.
• Intuitive, icon-based programming with drag-and-drop PC
configuration simplifies device setup and management
• Two six-amp safety relay outputs, each with three N.O. sets of
contacts
• Ten inputs, including four that can be used as non-safe
outputs
• Innovative daisy Chain Diagnostic (DCD)
• Automatic Terminal Optimization (ATO) can increase the inputs
from 10 to up to 14
• Industrial Ethernet two-way communication
◦ 256 virtual non-safe status outputs
◦ 80 virtual non-safe inputs (reset, on/off, cancel off-delay,
mute enable)
◦ Provision of DCD diagnostic data
• SCR P-FPS external drive for fast swap and quick
configuration without a PC (see SCR P: Using the SCR P-
FPS on p. 181)
3.1
SCR P Models
Model
Description
SCR P-10-6R-4
Configurable safety relay controller - 10 inputs (4 convertible), two 3-channel safety relay outputs,
Daisy Chain Diagnostic, Industrial Ethernet
3.2 SCR P Features and Indicators
Connection points are push-in spring clamp connectors.
Wire Size: 0.2 mm² to 2.08 mm², 24 to 14 AWG
Figure 2: Features and Indicators
Important: Clamp terminals are designed for one wire only. If more than one wire is connected to a
terminal, a wire could loosen or become completely disconnected from the terminal, causing a short.
Use a stranded wire or a wire with an accompanying ferrule. Tinned wires are not recommended.
After inserting the wire into the terminal, tug the wire to make sure it is properly retained. If the wire is not
retained, consider using a different wiring solution.
Figure 1: Safety Controller SCR P

Programmable Safety Controller SCR P
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3.3 SCR P Using FID 2 Safety Controllers
Over time, BERNSTEIN adds new features to some devices. The Feature ID (FID) identifies the set of features and
functions included in a particular model. Generally, an increasing FID number corresponds to an increasing feature set. A
configuration using a higher numbered FID feature is not supported by a Safety Controller of a lower FID. Feature sets are
forward compatible, not backwards compatible.
Figure 3: Example SCR P label
3.4
Input and Output Connections
3.4.1 SCR P Safety and Non-Safety Input Devices
The SCR P has 10 input terminals that can be used to monitor either safety or non-safety devices; these devices may
incorporate either solid-state or contact-based outputs.
Some of the input terminals can be configured to either source 24 V dc for monitoring contacts or to signal the status of an
input or an output. The function of each input circuit depends on the type of the device connected; this function is
established during the controller configuration.
3.4.2 SCR P Safety Relay Outputs
The SCR P has two, three-channel, normally open (N.O.), safety relay outputs.
The Safety Outputs are designed to control Final Switching Devices (FSDs) and Machine Primary Control Elements (MPCEs)
that are the last elements (in time) to control the dangerous motion. These control elements include relays, contactors,
solenoid valves, motor controls, and other devices that may also incorporate force-guided (mechanically-linked) monitoring
contacts, or electrical signals needed for external device monitoring (EDM).
Functional Stops according to IEC 60204-1 and ANSI NFPA79
The Safety Controller is capable of performing two functional stop types:
• Category 0: an uncontrolled stop with the immediate removal of power from the guarded machine
• Category 1: a controlled stop with a delay before power is removed from the guarded machine
Delayed stops can be used in applications where machines need power for a braking mechanism to stop the hazardous
motion.

Programmable Safety Controller SCR P
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3.4.3 SCR P Status Outputs and Virtual Status Outputs
Using the Software, the SCR P can be configured for up to 256 virtual status outputs to communicate information over the
network. These outputs have the capability to send non-safety status signals to devices such as programmable logic
controllers (PLCs) or human machine interfaces (HMIs). See Virtual Status Outputs on p. 51 for more information.
The SCR P has four convertible I/Os (labeled IOx) that can be used as Status Outputs to directly control indicator lights or
be hard wired inputs to PLCs. These outputs communicate the same information as the virtual status outputs.
The SCR P FID 2 or later can act as an interface to provide data from a chain of devices with imbedded Daisy Chain
Diagnostic (DCD) data, such as BERNSTEIN SRF Safety Switches, over the network.
3.5
SCR P Automatic Terminal Optimization (ATO) Feature with
External Terminal Blocks (ETB)
Automatic Terminal Optimization (ATO) Feature with External Terminal Blocks (ETB) is a standard feature on all
SCRP models and is enabled by default.
The ATO feature can expand the 10 terminals on the SCR P-2 to work with additional inputs by optimizing terminals and
using ETBs. As devices are added, deleted or edited, the Software automatically provides the optimum terminal assignment
to minimize wiring and maximize terminal utilization.
ATO is a smart feature that provides all available device types and configuration options as a configuration is created. After
all IN and I/O terminals are occupied and another device is added, ATO looks for devices that require +24 V test pulses
from the Safety Controller. These devices are combined via an External Terminal Block (ETB) to free up an I/O terminal.
Each ETB allows for up to three different devices to share a single I/O +24 V signal.
Disable ATO by editing the module properties of the SCR P in the Software, if preferred. ETBs will still be active, but you will
be required to re-assign I/O terminals manually as needed to fully optimize terminal utilization.
WARNING:
• StatusOutputsandVirtualStatusOutputsarenotsafetyoutputsandcanfailineithertheOnor
the Off state.
• If a Status Output or a Virtual Status Output is used to control a safety-critical application, a
failure to danger is possible and may lead to serious injury or death.
• Never use a Status Output or Virtual Status Output to control any safety-critical applications.

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4 Specifications and Requirements
4.1 SCR P Specifications
Power
Voltage: 24 V DC ±20%
(SELV/PELV)
Current:
240 mA maximum, no load (relays on)
530 mA maximum, full load (IO1 to IO4 used as auxiliary outputs)
Safety Inputs (and Convertible I/O when used as inputs)
Input On threshold: > 15 V dc (guaranteed on), 30 V dc maximum
Input Off threshold: < 5 V dc and < 2 mA, –3 V dc minimum
Input On current: 5 mA typical at 24 V dc, 50 mA peak contact
cleaning current at 24 V dc
Input lead resistance: 300 Ω maximum (150 Ω per lead)
Input requirements for a 4-wire Safety Mat: 2
· Maximum capacity between plates: 0.22 μF 2
Convertible I/O
Sourcing current: 80 mA maximum (overcurrent
protected) Test Pulses: ~1 ms every 25 to 75 ms
Daisy Chain Diagnostic
Two diagnostic series connectable (IN3+4 and IN5+6)
Up to 32 safety devices connected per series
Automatic Terminal Optimization Feature
Up to three devices connected with user-provided terminal blocks
Network Interface
Ethernet 10/100 Base-T/TX, RJ45 modular connector
Selectable auto negotiate or manual rate and duplex
Auto MDI/MDIX (auto cross)
Protocols: EtherNet/IP (with PCCC), Modbus/TCP, and PROFINET
Data : 256 virtual Status Outputs; fault diagnostic codes and messages;
access to fault log
· Maximum capacity between bottom plate and ground: 0.22 μF
· Maximum resistance between the 2 input terminals of one plate: 20 Ω
2
If the safety mats share a convertible I/O, this is the total capacitance of all shared safety mats.

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Response and Recovery Times
Input to Output Response Time (Input Stop to Output Off): see
the Configuration Summary in the Software, as it can vary
Input Recovery Time (Stop to Run): Turn On Delay (if set) plus 250 ms
typical (400 ms maximum)
Virtual Input (Mute Enable and On/Off) Timing: RPI + 200 ms typical
Virtual Input (Manual Reset and Cancel Delay) Timing: see Virtual
Non- Safety Input Devices on p. 37 for details
Off Delay Tolerance
The maximum is the response time given in the configuration summary
plus 0.02%
The minimum is the configured off delay time minus 0.02% (assuming
no power loss or faults)
On Delay Tolerance
The maximum is the configured on delay plus 0.02% plus 250ms
typical (400 ms maximum)
The minimum is the configured on delay minus 0.02%
Safety Outputs
3
NO sets of contacts for each output channel (RO1 and RO2).
Each normally open output is a series connection of contacts from
two forced-guided (mechanically linked) relays. RO1 consists of
relays K1 and K2. RO2 consists of relays K3 and K4.
Contacts
AgNi + 0.2 μm gold
Overvoltage Category
Output relay contact voltage of 1 V to 150 V ac/dc: Category III Output
relay contact voltage of 151 V to 250 V ac/dc: Category II (Category III,
if appropriate overvoltage reduction is provided, as described in this
document.)
Individual Contact Current Rating
Refer to the Temperature Derating graph when more than one contact
output is used.
Minimum
Maximum
Voltage
10 V ac/dc
250 V ac / 24 V dc
Current
10 mA ac/dc
6 A
Power
100 mW (100 mVA)
200 W (2000 VA)
Switching Capacity (IEC 60947-5-1)
AC 15
NO: 250 V ac, 3 A
DC 13
NO: 24 V dc, 2 A
DC 13 at 0.1 Hz
NO: 24 V dc, 4 A
Operating Conditions
Temperature: 0 °C to +55 °C (+32 °F to +131 °F) (see Temperature
Derating graph)
Storage Temperature: –30 °C to +65 °C (–22 °F to +149 °F)
Humidity: 90% at +50 °C maximum relative humidity (non-
condensing) Operating Altitude: 2000 m maximum (6562 ft
maximum)
Environmental Rating
IP20 due to IEC (NEMA 1), for use inside IP54 due to IEC (NEMA 3) or
better enclosure
Mechanical Stress
Shock: 15 g for 11 ms, half sine, 18 shocks total (per IEC 61131-2)
Vibration: 3.5 mm occasional / 1.75 mm continuous at 5 Hz to 9 Hz,
1.0 g occasional and 0.5 g continuous at 9 Hz to 150 Hz: all at 10
sweep cycles per axis (per IEC 61131-2)
Mechanical Life
20,000,000 cycles
Electrical Life
50,000 cycles at full resistive load
UL Pilot Duty
B300 Q300
B10d Values
Voltage
Current
B10d
230 V ac
2 A
350,000
230 V ac
1 A
1,000,000
24 V dc
≤ 4 A
10,000,000
Push-in Spring Clamp Terminals
Wire Size: 0.2 mm² to 2.08 mm², 24 to 14 AWG
Important: Clamp terminals are designed for
one wire only. If more than one wire is
connected to a terminal, a wire could loosen
or become completely disconnected from the
terminal, causing a short.
Use a stranded wire or a wire with an
accompanying ferrule. Tinned wires are not
recommended.
After inserting the wire into the terminal, tug
the wire to make sure it is properly retained. If
the wire is not retained, consider using a
different wiring solution.

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EMC
Meets or exceeds all EMC requirements for immunity per IEC
61326-3-1:2012 and emissions per CISPR 11:2004 for Group 1, Class
A equipment
Safety
Category 4, PL e (EN ISO 13849)
SIL CL 3 (IEC 62061, IEC 61508)
Required Overcurrent Protection
Overcurrent protection is required to be provided by end product
application per the supplied table.
Overcurrent protection may be provided with external fusing or via
Current Limiting, Class 2 Power Supply.
Supply wiring leads < 0,20mm² (24 AWG) shall not be spliced.
For additional product support, go to www.bernstein.eu.
Safety
Ratings
PFH [1/h]: 5.01 × 10
Proof Test Interval: 20 years
Product Performance Standards
See Standards and Regulations on p. 192 for a list of industry
applicable U.S. and international standards
Certifications
250
PROGRAMMABLE
SAFETY
CONTROLLER
NRGF
SCR P Temperature Derating
216
200
150
100
50
0
0 10
20 30 40 50 60
Temperature °C
∑I2 = I12 + I22 + I32 + I42 + I52 + I62 ∑I2 = I12 + I22 + I32 + I42 + I52 + I62 (all six modules)
I1= 4 A (normally open output RO1 channel 1) I1= 4 A
I2= 4 A (normally open output RO1 channel 2) I2= 4 A
I3= 4 A (normally open output RO1 channel 3) I3= 4 A
I4= 4 A (normally open output RO2 channel 4) I4= 4 A
Example Temperature Derating Calculations
Note: Transient suppression is recommended
when switching inductive loads. Install
suppressors across load. Never install
suppressors across output contacts (see
Warning).
WARNING: Electrical connections must be
made by qualified personnel in accordance
with local and national electrical codes and
regulations.
5A/contact (150A
2
)
6A/contact (216 A
2
)
Single module
free standing
Three modules side-by-side (no gap)
same load on each device
3A/contact (54A
2
)
Sum of the squared current for each set of contacts
Supply Wiring
(mm²/AWG)
Required Overcurrent Protection
(A)
0,50 / 20
5.0
0,32 / 22
3.0
0,20 / 24
2.0
0,13 / 26
1.0
0,08 / 28
0.8
0,05 / 30
0.5

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I5= 4 A (normally open output RO2 channel 5) I5= 4 A
I6= 4 A (normally open output RO2 channel 6) I6= 4 A
∑I2 = 42 + 42 + 42 + 42 + 42 + 42 = 96 A2 ∑I2 = 42 + 42 + 42 + 42 + 42 + 42 = 96 A2
Tmax = 55 °C Tmax = 46 °C
4.2 Dimensions
All measurements are listed in millimeters, unless noted otherwise.
Figure 4: SCR P Dimensions
4.3 PC Requirements
Operating system: Microsoft Windows 7, Windows 8 (except Windows RT), or Windows 103
System type: 32-bit, 64-bit
Hard drive space: 80 MB (plus up to 280 MB for Microsoft .NET 4.0, if not already installed)
Memory (RAM): 512 MB minimum, 1 GB+ recommended
Processor: 1 GHz minimum, 2 GHz+ recommended
Screen resolution: 1024 × 768 full color minimum, 1650 × 1050 full color recommended
Third-party software: Microsoft .NET 4.0 (included with installer), PDF Viewer (such as Adobe Acrobat) USB port:
USB 2.0 (not required to build configurations)
3 Microsoft and Windows are registered trademarks of Microsoft Corporation in the United States and/or other countries.
Example Temperature Derating Calculations
Important: Administrative rights are required to install the Safety Controller drivers (needed for communication with the
controller).

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5 System Installation
5.1 Installing the Software
1. Download the latest version of the software from www.bernstein.eu/downloads
2. Navigate to and open the downloaded file.
3. Click Next to begin the installation process.
4. Confirm the software destination and availability for users and click Next.
5. Click Next to install the software.
6. Depending on your system settings, a popup window may appear prompting to allow BERNSTEIN Safety
Controller to make changes to your computer. Click Yes.
7. Click Close to exit the installer.
Open BERNSTEIN Safety Controller from the Desktop or the Start Menu.
5.2
Installing the Safety Controller
Do not exceed the operating specifications for reliable operation. The enclosure must provide adequate heat dissipation so
that the air closely surrounding the Safety Controller does not exceed its maximum operating temperature (see
Specifications and Requirements on p. 12).
5.2.1 Mounting Instructions
The Safety Controller mounts to a standard 35 mm DIN-rail track. It must be installed inside an enclosure rated IP54 due to
IEC (NEMA 3) or better. It should be mounted to a vertical surface with the vent openings at the bottom and the top to
allow for natural convection cooling.
Follow the mounting instructions to avoid damage to the Safety Controller.
To mount the SCR P Safety Controller:
1. Tilt the top of the module slightly backward and place it on the DIN rail.
2. Straighten the module against the rail.
3. Lower the module onto the rail.
To remove SCR P Safety Controller:
1. Push up on the bottom of the module.
2. Tilt the top of the module slightly forward.
3. Lower the module after the top rigid clip is clear of the DIN rail.
Important: Administrative rights are required to install the Safety Controller drivers (needed for
communication with the controller).
Important: Mount the Safety Controller in a location that is free from large shocks and high-amplitude
vibration.
CAUTION: Electrostatic Discharge (ESD) can cause damage to electronic equipment. To prevent this,
follow the proper ESD handling practices such as wearing an approved wrist strap or other grounding
products, or touching a grounded object before handling the modules. See ANSI/ESD S20.20 for further
information about managing ESD.
Note: To remove an expansion module, pull apart other modules on each side of the desired module to
free bus connectors.

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6 Installation Considerations
6.1 Appropriate Application
The correct application of the Safety Controller depends on the type of machine and the safeguards that are to be
interfaced with the Safety Controller. If there is any concern about whether or not your machinery is compatible
with this Safety Controller, contact BERNSTEIN AG.
6.2
SCR P Applications
The SCR P Safety Controller is ideal for any small to medium size machine that would typically use two independent safety
relay modules.
Figure 5: SCR P Sample Application 1
WARNING: Not a Stand-Alone Safeguarding Device
This BERNSTEIN device is considered complementary equipment that is used to augment safeguarding
that limits or eliminates an individual's exposure to a hazard without action by the individual or others.
Failure to properly safeguard hazards according to a risk assessment, local regulations, and relevant
standards may lead to serious injury or death.
WARNING: User Is Responsible for Safe Application of this device
The application examples described in this document depict generalized guarding situations. Every
guarding application has a unique set of requirements.
Make sure that all safety requirements are met and that all installation instructions are followed. Direct
any questions regarding safeguarding to a BERNSTEIN application engineer at the number or addresses
listed this document.
WARNING: Read this Section Carefully Before Installing the System
The BERNSTEIN Safety Controller is a control device that is intended to be used in conjunction with a
machine safeguarding device. Its ability to perform this function depends upon the appropriateness of
the application and upon the Safety Controller's proper mechanical and electrical installation and
interfacing to the machine to be guarded.
If all mounting, installation, interfacing, and checkout procedures are not followed properly, the Bernstein
Safety Controller cannot provide the protection for which it was designed. The user is responsible for
satisfying all local, state, and national laws, rules, codes, or regulations relating to the installation and use
of this control system in any particular application. Make sure that all safety requirements have been met
and that all technical installation and maintenance instructions contained in this document are followed.
Muting Indicator Lights
Safety Light Screens
Hazardous Area
HMI
E-Stop Buttons

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Figure 6: SCR P Sample Application 2
6.3
Safety Input Devices
The Safety Controller monitors the state of the safety input devices that are connected to it. In general, when all of the input
devices that have been configured to control a particular Safety Output are in the Run state, the Safety Output turns or
remains On. When one or more of the safety input devices change from Run state to Stop state, the Safety Output turns
Off. A few special safety input device functions can, under predefined circumstances, temporarily suspend the safety input
stop signal to keep the Safety Output On, for example, muting or bypassing.
The Safety Controller can detect input faults with certain input circuits that would otherwise result in a loss of the control of
the safety function. When such faults are detected, the Safety Controller turns the associated outputs Off until the faults are
cleared. The function blocks used in the configuration impact the safety outputs. It is necessary to carefully review the
configuration if the input device faults occur.
Methods to eliminate or minimize the possibility of these faults include, but are not limited to:
• Physically separating the interconnecting control wires from each other and from secondary sources of power
• Routing interconnecting control wires in separate conduit, runs, or channels
• Locating all control elements (Safety Controller, interface modules, FSDs, and MPCEs) within one control panel,
adjacent to each other, and directly connected with short wires
• Properly installing multi-conductor cabling and multiple wires through strain-relief fittings. Over-tightening of a
strain-relief can cause short circuits at that point
• Using positive-opening or direct-opening components, as described by IEC 60947-5-1, that are installed and
mounted in a positive mode
• Periodically checking the functional integrity/safety function
• Training the operators, maintenance personnel, and others involved with operating the machine and the
safeguarding to recognize and immediately correct all failures
Note: Follow the device manufacturer's installation, operation, and maintenance instructions and
all relevant regulations. If there are any questions about the device(s) that are connected to the
Safety Controller, contact BERNSTEIN AG for assistance.

Programmable Safety Controller SCR P
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19
Figure 7: SCR P Input and output terminal locations
6.3.1
Safety Circuit Integrity and ISO 13849-1 Safety Circuit Principles
Safety circuits involve the safety-related functions of a machine that minimize the level of risk of harm. These safety-related
functions can prevent initiation, or they can stop or remove a hazard. The failure of a safety-related function or its
associated safety circuit usually results in an increased risk of harm.
The integrity of a safety circuit depends on several factors, including fault tolerance, risk reduction, reliable and well-tried
components, well-tried safety principles, and other design considerations.
Depending on the level of risk associated with the machine or its operation, an appropriate level of safety circuit integrity
(performance) must be incorporated into its design. Standards that detail safety performance levels include ANSI B11.19
Performance Criteria for Safeguarding and ISO 13849-1 Safety-Related Parts of a Control System.
Safety Circuit Integrity Levels
Safety circuits in International and European standards have been segmented into Categories and Performance Levels,
depending on their ability to maintain their integrity in the event of a failure and the statistical likelihood of that failure. ISO
13849-1 details safety circuit integrity by describing circuit architecture/structure (Categories) and the required performance
level (PL) of safety functions under foreseeable conditions.
In the United States, the typical level of safety circuit integrity has been called "Control Reliability". Control Reliability
typically incorporates redundant control and self-checking circuitry and has been loosely equated to ISO 13849-1 Category
3 or 4 and/or Performance Level “d” or “e” (see ANSI B11.19).
Perform a risk assessment to ensure appropriate application, interfacing/hookup, and risk reduction (see ANSI B11.0 or ISO
12100). The risk assessment must be performed to determine the appropriate safety circuit integrity in order to ensure that
the expected risk reduction is achieved. This risk assessment must take into account all local regulations and relevant
standards, such as U.S. Control Reliability or European "C" level standards.
The Safety Controller inputs support up to Category 4 PL e (ISO 13849-1) and Safety Integrity Level 3 (IEC 61508 and IEC
62061) interfacing/hookup. The actual safety circuit integrity level is dependent on the configuration, proper installation of
external circuitry, and the type and installation of the safety input devices. The user is responsible for the determination of
the overall safety rating(s) and full compliance with all applicable regulations and standards.
The following sections deal only with Category 2, Category 3, and Category 4 applications, as described in ISO 13849-1.
The input device circuits shown in the table below are commonly used in safeguarding applications, though other solutions
are possible depending on fault exclusion and the risk assessment. The table below shows the input device circuits and the
safety category level that is possible if all of the fault detection and fault exclusion requirements are met.
WARNING: Input Device and Safety Integrity
The Safety Controller can monitor many different safety input devices. The user must conduct a Risk
Assessment of the guarding application to determine what Safety Integrity Level needs to be reached in
order to know how to properly connect the input devices to the Safety Controller. The user must also
take steps to eliminate or minimize possible input signal faults/failures that may result in the loss of the
safety functions.
WARNING: Risk Assessment
The level of safety circuit integrity can be greatly affected by the design and installation of the safety
devices and the means of interfacing of those devices. A risk assessment must be performed to
determinetheappropriatelevelofsafetycircuitintegritytoensuretheexpectedriskreductionis
achieved and all relevant regulations and standards are complied with.

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Fault Exclusion
An important concept within the requirements of ISO 13849-1 is the probability of the occurrence of a failure, which can be
reduced using a technique termed "fault exclusion." The rationale assumes that the possibility of certain well-defined
failure(s) can be reduced via design, installation, or technical improbability to a point where the resulting fault(s) can be, for
the most part, disregarded—that is, "excluded" in the evaluation.
Fault exclusion is a tool a designer can use during the development of the safety-related part of the control system and the
risk assessment process. Fault exclusion allows the designer to design out the possibility of various failures and justify it
through the risk assessment process to meet the requirements of ISO 13849-1/-2.
Requirements vary widely for the level of safety circuit integrity in safety applications (that is, Control Reliability or Category/
Performance Level) per ISO 13849-1. Although BERNSTEIN always recommends the highest level of safety in any
application, it is the responsibility of the user to safely install, operate, and maintain each safety system and comply with all
relevant laws and regulations.
6.3.2
Safety Input Device Properties
The Safety Controller is configured via the Software to accommodate many types of safety input devices. See Adding
Inputs and Status Outputs on p. 52 for more information on input device configuration.
Reset Logic: Manual or Automatic Reset
A manual reset may be required for safety input devices by using a Latch Reset Block or configuring a safety output for a
latch reset before the safety output(s) they control are permitted to turn back On. This is sometimes referred to as “latch”
mode because the safety output “latches” to the Off state until a reset is performed. If a safety input device is configured for
automatic reset or “trip” mode, the safety output(s) it controls will turn back On when the input device changes to the Run
state (provided that all other controlling inputs are also in the Run state).
Connecting the Input Devices
The Safety Controller needs to know what device signal lines are connected to which wiring terminals so that it can apply
the proper signal monitoring methods, Run and Stop conventions, and timing and fault rules. The terminals are assigned
automatically during the configuration process and can be changed manually using the Software.
Signal Change-of-State Types
Two change-of-state (COS) types can be used when monitoring dual-channel safety input device signals: Simultaneous or
Concurrent.
WARNING: Input Devices with dual contact inputs using 2 or 3 terminals
Detection of a short between two input channels (contact inputs, but not complementary contacts) is not
possible, if the two contacts are closed. A short can be detected when the input is in the Stop state for at
least 2 seconds (see the INx & IOx input terminals Tip in Safety Input Device Options on p. 22).
WARNING:
• Category 2 or 3 Input Shorts
• It is not possible to detect a short between two input channels (contact inputs, but not
complementary contacts) if they are supplied through the same source (for example, the same
terminal from the Safety Controller in a dual-channel, 3-terminal hookup, or from an external 24 V
supply) and the two contacts are closed.
• Such a short can be detected only when both contacts are open and the short is present for at
least 2 seconds.
WARNING: Risk Assessment
The level of safety circuit integrity can be greatly affected by the design and installation of the safety
devices and the means of interfacing of those devices. A risk assessment must be performed to
determinetheappropriatelevelofsafetycircuitintegritytoensuretheexpectedriskreductionis
achieved and all relevant regulations and standards are complied with.