Moore Industries SRM User manual

SRM
Safety Relay Module
No. 225-765-00G
April 2018

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User’s Manual
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April 2018
Safety Relay Module
SRM
Customer Support
Customer Support
Moore Industries is recognized as the industry leader in delivering top quality to its customers in products
and services. We perform a sequence of stringent quality assurance checks on every unit we ship. If any
Moore Industries product fails to perform up to rated specications, call us for help. Our highly skilled sta󰀨 of
trained technicians and engineers pride themselves on their ability to provide timely, accurate, and practical
answers to your process instrumentation questions. Our headquarters and other facilities phone numbers
are listed below.
There are several pieces of information that can be gathered before you call the factory that will help our
sta󰀨 get the answers you need in the shortest time possible. For fastest service, gather the complete model
and serial number(s) of the problem unit(s) and the job number of the original sale.
www.miinet.com
Demand Moore Reliability
Locations
World Headquarters Europe Australia
16650 Schoenborn Street
North Hills, California
91343-6196, U.S.A.
Tel: [phone]
Fax: [phone]
E-mail: [email protected]
TOLL FREE: 1-800-999-2900
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Safety Messages
Please read this manual in its entirety. It should answer most of your questions. For personal and system safety, and for
optimum product performance, make sure you thoroughly understand the contents before installing, using, or maintaining
this product. Should you still have questions please visit our web site at www.miinet.com or contact any of our sales/
support o󰀩ces nearest you.
Your safety and the safety of others is very important. We have provided many important safety messages in this
manual. Please read these messages carefully. These safety messages alert you to potential hazards that could hurt
you or others or render damage to units.
All Moore Industries instrumentation should only be used for the purpose and in the manner described in this manual.
If you use this product in a manner other than that for which it was intended, unpredictable behavior could ensue with
possible hazardous consequences.
Each safety message is associated with a safety alert symbol. These symbols are found in the throughout the manual.
The denition of these symbols is described below:
Pay particular attention wherever you see the following symbols:
Note – Information that is helpful for a procedure,
condition or operation of the unit.
Caution – Hazardous procedure or condition that
could damage or destroy the unit.
Warning – Hazardous procedure or condition that
could injure the operator.
Qualied Personnel
The Moore Industries’ product/systems described in this manual may be operated only by personnel qualied for the
specic task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualied personnel are those who, based on their training and experience, are capable of identifying risks and avoiding
potential hazards when working with these Moore Industries’ products/systems.
Proper use of Moore Industries products
Moore Industries’ products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended or
approved by Moore Industries’ . Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible ambient
conditions must be complied with. The information in the relevant documentation must be observed.
We have reviewed the contents of this publication to ensure consistency with the hardware and/or software described.
Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the information in this
publication is reviewed regularly and any necessary corrections are included in subsequent editions. Specications and
information are subject to change without notice.
All product and company names are trademarks™ or registered®trademarks of their respective holders. Use of them
does not imply any a󰀩liation with or endorsement by them unless otherwise specied.
Safety Relay Module
SRM
About this Manual

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Table of Contents
Safety Relay Module
SRM
Section 1 - Introduction 6
Description................................................................................................................6
Model Numbers and Options...................................................................................6
SRM Safety Relay Module .......................................................................................................... 7
Section 2 - Calibration Bench Check 8
Calibration.................................................................................................................8
Bench Check Procedure..........................................................................................8
Section 3 - Installation and Wiring 10
Terminal Designations ...........................................................................................10
Dimensions ............................................................................................................. 11
Mounting ....................................................................................................................................11
Electrical Connections ............................................................................................................... 12
Installation Category.................................................................................................................. 12
Contact/Load Protection ............................................................................................................ 13
Contact/Load Suppression ........................................................................................................ 13
Section 4 - Operation and Maintenance 14
Operation.................................................................................................................14
Visual Diagnostics .................................................................................................................... 14
Maintenance............................................................................................................15
Fuse Replacement .................................................................................................................... 15
CONTENTS

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Table of Contents
Safety Relay Module
SRM
Section 5 - Applications 16
Typical SIL 1 or SIL 2 Application .........................................................................16
SIL 1 or SIL 2 Application using Monitor Output.................................................17
SIL 1 or SIL 2 Application when used with “wet” Relay/Contact Outputs ........ 18
Section 6 - SRM in Safety Instrumented Systems 19
Functional Safety Description...............................................................................19
Failure Rate Data ....................................................................................................19
Product life..............................................................................................................19
Contact life..............................................................................................................19
Installation...............................................................................................................20
Conguration..........................................................................................................20
Visual Diagnostics .................................................................................................20
Process Safety Time ..............................................................................................20
Proof Test Procedure .............................................................................................21
Repair and Replacement........................................................................................21
Recording and Reporting of SRM Performance.................................................. 21
Section 7 - Specications 23
Section 8- Ordering Information 24
Warranty Disclaimer 25
CONTENTS

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Safety Relay Module
SRM
SECTION 1
Section 1 - Introduction
The Moore Industries’ Safety Relay Module (SRM) is part of Moore Industries’ FS FUNCTIONAL
SAFETY SERIES products. The SIL 2 certied SRM is designed and manufactured to provide a
high level of availability for safety critical applications and for use as a component part of a safety
instrumented system.
This manual contains information needed to install, operate and maintain this product. When the
SRM is used in a SIL rated safety application, please refer to the Safety Instrumented Systems
section of this manual. Safety and failure rate data for the SRM is contained in the SRM FMEDA
report (Moore Industries’ Document No: 700-702-35), and is available upon request.
Description
The SRM is a relay repeater model that accepts a single contact closure input from a logic solver
trip output such as the Moore Industries STA Safety Trip Alarm or the SPA2 Programmable Limit
Alarm Trip. The SRM provides three normally open (NO) and one normally closed (NC) contacts
per alarm input, allowing you to add alarm contacts for your safety processes without special
installation or conguration.
Relay Terminology
Normal is the term used to describe the “shelf-state” of relay contacts. The contacts of a
Normally Open relay are open (infinite resistance) when the relay is not energized. The contacts
of a Normally Closed relay are open when the relay is energized (closed when not energized).
Note: Sometimes a non-alarm input level is referred to as being in a “normal” condition. This
practice is intentionally avoided in this manual. Do not confuse the term “normal”, as in Normally
Open or Normally Closed, with a non-alarm input condition. In this manual, “normal” is an
exclusive reference to the shelf state or quiescent state of an alarm’s relay contacts, whether
open or closed.
SRM Applications
Please refer to Section 5: Applications for examples of typical SRM applications
Model Numbers and Options
The following section provides details of the Moore Industries model number and the available
options for the SRM.
Moore Industries model numbers for SRM are structured as follows:
SRM / CC / 3RO / 24DC / [DIN]
Unit / Input / Output / Power / - Options [Housing]
Refer to Section 8 Ordering Information for a quick reference table of ordering information.

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April 2018 Safety Relay Module
SRM
SECTION 1
SRM Safety Relay Module
INPUTS
CC (Contact Closure)
When the input to the SRM is open there will be 24Vdc present at the input terminals.
When the input to the SRM is closed there will be a maximum of 55mA flowing through the
closed circuit.
Note: The SRM’s CC (Contact Closure) input circuit includes an internal snubbing diode
across it’s relay coil which means there is no need for any external suppression across the input
terminals.
OUTPUTS
3RO (3 Relay Outputs)
There are 3 sets of fuse-protected, normally open relay contacts. These are rated
250Vac/30Vdc, 5A (non-inductive).
Note: There is one set of fuse-protected, normally closed relay contacts (Monitor Contacts)
used for diagnostics but can also be used as part of the safety function. These are rated
250Vac/30Vdc, 1A (non-inductive).
POWER
24DC
The required power is 24Vdc, -5% to +10%. Power consumption is 1.5W typical, 2.3W
maximum.
OPTIONS
There are no options available at this time.
HOUSING
[DIN]
DIN-style housing mounts on 35mm Top Hat rail (EN50022).

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Moore industries-International, Inc.
Safety Relay Module
SRM
SECTION 2
Section 2 - Calibration Bench Check
We highly recommend that you perform a bench check of the SRM prior to installing it in the eld.
Doing this will ensure that it is operating within your expectations or requirements.
Calibration
The SRM does not require calibration.
Bench Check Procedure
Setup unit using Figures 2.1 and 2.2 and equipment in table 2.1.
1. Apply 24Vdc power to the SRM (with no other Inputs or Outputs connected) and verify the
status of the LEDs.
Power = Green
Input = Red
Output = Red
Also, using the ohmmeter, verify the status of the SRM outputs:
Output Terminals
• Normally Open 1 to Common 1
NO1-to-CM1 = Open
• Normally Open 2 to Common 2
NO2-to-CM2 = Open
• Normally Open 3 to Common 3
NO3-to-CM3 = Open
Monitor Terminals
• Normally Closed 4 to Common 4
NC4-to-CM4 = Less than 1 ohm
2. Connect the 20 ohm resistor across the two Input terminals. Note: The reason for using the
20 ohm resistor is to simulate worn or dirty contacts at the Input.
Verify the status of the LEDs.
Power = Green
Input = Green
Output = Green
Also, using the ohmmeter, verify the status of the SRM outputs:
Output Terminals
• Normally Open 1 to Common 1
NO1-to-CM1 = Less than 1 ohm
• Normally Open 2 to Common 2
NO2-to-CM2 = Less than 1 ohm
• Normally Open 3 to Common 3
NO3-to-CM3 = Less than 1 ohm
Monitor Terminals
• Normally Closed 4 to Common 4
NC4-to-CM4 = Open

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Figure 2.1. SRM Front Panel LEDs
Figure 2.2. Bench Check Set-up
POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
Power LED
Input LED
Output LED
POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
+
–
24Vdc
Power
Ground
20 Ω
Safety Relay Module
SRM
SECTION 2
Calibrated, regulated 24Vdc, -5% to +10%
20 ohm 1/4W resistor
Calibrated to an accuracy of ±0.5%
Device Specifications
Power Supply
Load Resistor
Ohmmeter
All referenced product names are the sole property of their respective manufacturers .
Table 2.1. Bench Check Equipment for the SRM.

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Moore industries-International, Inc.
Section 3 - Installation and Wiring
Instructions in this section and others may require special precautions to ensure the safety of the
personnel performing the operations. Notes, Cautions and Warnings that may cause potential
safety issues are indicated throughout this manual by symbols, please refer to Page 3 of this
manual to view and familiarize yourself with these safety message symbols.
Note: Make sure to bench check the instruments prior to installation. Also, install all instruments
in their intended application and on their rail before making any electrical connections. Allow
enough room for pivoting instruments vertically on the rail for removal in applications involving
multiple banks of SRM.
Figure 3.1. Terminal Designations
Terminal Designations
CC NO1
CM1 NO2 CM2 NO3 CM3
CC NC4 CM4
DC(
+
)
DCC(
-
)
NOT USED
NOT USED NOT USED
NOT USED
GND
CC
CC
NC4
CM4
INPUT MONITOR
NO1
CM1
NO2
CM2
NO3
CM3
DC(+)
DCC(-)
GND
24VDC
POWER
CASE
VIEWED FROM TOP VIEWED FROM BOTTOM
NOTES:
1. Terminal blocks can accommodate 14-22 AWG solid wiring.
KEY:
DC = Power Input (+)
DCC = Power Input (-)
CM = Relay Common
GND = Ground
NO = Normally Open
NC = Normally Closed
Safety Relay Module
SRM
SECTION 2

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Dimensions
POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
35mm
(1.4 in)
100mm
(3.94 in)
130mm
(5.15 in)
119mm
(4.7 in)
Figure 1. The SRM Dimensions
Mounting
The SRM is housed in a DIN case that can be mounted on 35mm Top-Hat (EN50022) DIN-rail.
To mount the SRM on a Top-Hat DIN-rail, seat the upper extrusion on the unit back panel over the
top lip of the rail and pivot downward until the housing locks into place.
When mounting multiple units, like a rack or cabinet, make sure to allow adequate vertical
spacing for pivoting the units.
Safety Relay Module
SRM
SECTION 3

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Electrical Connections
When installing any Moore Industries product, always follow all local regulations and standards
for grounding, shielding, and safety. Refer to Figure 3.1 for Terminal Designations. Use +90°C
suitable wiring for all connections
Warning: Terminals on this unit may be connected to hazardous voltages. Before making ANY
connections to this unit, always remove power from the loop or instrument power terminals.
Installation Category
All terminals are rated CAT I.
Environmental rating = Pollution Degree 2.
Relay contacts are intended for connection to over voltage Category II mains sources.
Equipment Ratings
The SRM accepts a contact closure input and switches outputs up to 5A at up to 250 Vac or 30
Vdc for NO contacts and 1A at up to 250Vac or 30Vdc for NC contacts. It does not generate
hazardous voltages but may switch hazardous voltages (>50Vac) on its output contacts.
Products connected to the SRM should be designed to receive this type of input.
Warning: If this unit is used in a manner not specified by Moore Industries, the protection
provided by the equipment may be impaired.
24Vdc Supply Wiring
All power connections should be made with 14 or 20 AWG (2.0mm2 or 0.52mm2) wire.
The end of each conductor should be stripped no more than 0.25in (7mm). The end of the
stripped wire should be tinned with solder, or inserted into a ferrule and crimped before being
placed into a terminal block.
Tighten the screws on the terminal block to 4.4 - 5.3 lbf•in (0.5 - 0.6 N•m).
Input/Output Wiring
The Input/Output connections can be made with 14 to 22 AWG (2.0mm2 or 0.33mm2) wire.
If high voltage/currents are being switched on the relay contacts then 14 or 16 AWG (2mm2or
1.3mm2) wire is recommended.
The end of each conductor should be stripped no more than 0.25in (7mm).
Tighten the screws on the terminal block to 4.4 - 5.3 lbf•in (0.5 - 0.6 N•m).
Protective Earth Conductor
The Protective Earth Conductor shall be of equal or larger size wire than the other two power
conductors.
The Protective Earth Conductor shall be the first conductor connected to the unit when the unit is
being wired. It shall be the last conductor removed when the unit is being
un-wired.
Safety Relay Module
SRM
SECTION 3

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Recommended Ground Wiring Practices
Moore Industries recommends the following ground wiring practices:
• Any Moore Industries product in a metal case or housing should be grounded.
• The protective earth conductor must be connected to a system safety earth ground before
making other connections.
• All input signals to, and output signals from, Moore Industries’ products should be wired
using a shielded, twisted pair wiring technique. Shields should be connected to an earth or
safety ground.
• For the best shielding, the shield should be run all the way from the signal source to the
receiving device. (see Note below)
• The maximum length of un-shielded input and output signal wiring should be 2 inches.
Note: Some of Moore Industries’ instruments can be classified as receivers (IPT2, IPX2, etc.)
and some can be classified as transmitters (TRX, TRY, etc.) while some are both a receiver and
a transmitter (SPA2, HIM, etc). Hence, your shield ground connections should be appropriate for
the type of signal line being shielded. The shield should be grounded at the receiver and not at
the signal source.
Contact/Load Protection
The supply powering the contact/load shall be protected by a UL approved branch circuit fuse or
breaker, rated 250 Vac, 10 Amp.
Contact/Load Suppression
The SRM’s CC (Contact Closure) input circuit includes an internal snubbing diode across it’s relay
coil which means there is no need for any external suppression across the input terminals.
The SRM does not provide any surge suppression across its relay contacts. When the instrument
relays are used to switch an inductive load such as an external relay coil, contactor, solenoid
inductive load, large voltage spikes may be created in nearby cable harnesses. When excessive,
these voltage spikes can disrupt the operation of all nearby electronics including this product.
Inductive loads should have suppression devices installed at the load (for external relays this
would be right across the relay coil itself). Usually this is a simple diode for dc circuits. AC
circuits routinely use an R-C snubber. Please follow the external load manufacturer instructions
for their recommended suppression kits.
Caution: If suppression devices are not installed on inductive loads, the SRM unit may be
damaged. This damage could include blowing of replaceable fuses on the relay outputs (see
Maintenance section for fuse replacement).
Please contact Moore Industries’ Customer Service for further technical assistance.
CE Certification-related Guidelines
Installation of any Moore Industries’ products that carry the CE marking must adhere to the
guidelines in the Recommended Ground Wiring Practices section in order to meet the EN 61326
requirements set forth in the applicable EMC directive.
The Low Voltage Directive also applies to the SRM when connecting any of its output relay con-
tacts to voltages greater than 50 vac. In order to comply with EN61010-1 (Low Voltage Directive)
all guidelines in this section must be followed.
Safety Relay Module
SRM
SECTION 3

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Figure 4.1. SRM Front Panel LEDs
POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
Power LED
Input LED
Output LED
Visual Diagnostics
The SRM incorporates three (3) LEDs which indicate Input, Output, and Power status. The
Input and Output LEDs provide a visual diagnostic for the SRM. Both LED colors should always
match unless there is a relay failure such as stuck contacts. The Power LED will be green when
appropriate power is supplied to SRM.
•Input LED – When the SRM Input is open, the Input LED will be red. When the SRM Input is
closed, the Input LED will turn green.
•Output LED – When the Normally Open terminals are closed and the Monitor terminal is open, the
Output LED will be green. When the Normally Open terminals are open and the Monitor terminal is
closed, the Output LED will be red.
•Power LED – The Power LED will be green when appropriate power is supplied to SRM. If there
is power applied to the unit and the power led is off, the power fuse may be blown and need to be
replaced (see Maintenance section).
If both input and output LEDs are correct but any of the outputs are stuck open, the fuse on the
stuck output may be blown and need to be replaced (see Maintenance section).
Note: Applications that require wiring the SRM’s CC input to a “wet” contact (24Vdc) instead of
voltage free Contact Closure (see Applications Figure 5.3) will either show all green LEDs when
the contact/relay output is closed or all LEDs will be off (dark) when the contact/relay output is
open. If there are any red LEDs displayed then this indicates a relay failure or blown fuse.
Safety Relay Module
SRM
SECTION 4
Section 4 - Operation and Maintenance
When the SRM is used in a SIL rated safety application, please refer to the Safety Instrumented
Systems section of this manual before operating your unit.
Operation
Once installed, and supplied with the correct power, the SRM begins to operate immediately.
Depending upon environmental conditions, it can be expected to operate unattended for
extended periods of time.

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Figure 4.2. Fuse Locations
F205
F202
F203
F204
F201
POWER
MONITOR
NO3
NO2
NO1
Safety Relay Module
SRM
SECTION 4
Maintenance
Moore Industries suggests a quick check for terminal tightness and general unit condition every
year. Always adhere to any site requirements for programmed maintenance.
Fuse Replacement
Input power and all output terminals are fuse protected. If maximum voltage or currents are
exceeded on the input or output terminals, one or more fuses may blow and will need to be
replaced.. If fuse replacement is required, disconnect all terminals from the unit, remove left side
panel as viewed from the front and refer to Figure 5 below for fuse locations.
All fuses are 5mm x 20mm 250VAC Slow Blow with the following current rating:
- F201 (0.5A)- for Power Fuse
(Moore Industries Part Number: 800-855-16)
- F202-F204 (5.0A)- for Normally Open Process relays
(Moore Industries Part Number: 800-857-16)
- F205 (1.0A)- for Normally closed Monitor relay
(Moore Industries Part Number: 800-856-16)
Caution: Replacement fuses must be exactly the same size, type, voltage and current rating
as specified here. Any deviations could create a safety hazard. Replace fuses with caution,
pushing down excessively can result in damage to unit.

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Figure 5.1. SRM in SIL 1 and SIL 2 applications
POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
Load #1
NO1
CM1
NO2
CM2
NO3
CM3
DC(+)
DCC(-)
GND
24VDC
POWER
CASE
SRM Bottom View
Load #2
Load #3
+
24Vdc
Power
Ground
CC
CC
NC4
CM4
INPUT MONITOR
SRM Top View
NO1
CM1
NC1
STA
STA Bottom View
NO2
CM2
CM3
NC2
NO3
NC3
AC/DC
POWER
RELAY 1 RELAY 2
RELAY 3-FAULT
GND
Safety Relay Module
SRM
SECTION 5
Section 5 - Applications
This section provides some examples of typical applications for the SRM.
Typical SIL 1 or SIL 2 Application
The SRM used in a standard SIL 1 or SIL 2 application with up to three outputs.

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POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
Load #1
NO1
CM1
NO2
CM2
NO3
CM3
DC(+)
DCC(-)
GND
24VDC
POWER
CASE
SRM Bottom View
Load #2
Load #3
+
24Vdc
Power
Ground
CC
CC
NC4
CM4
INPUT MONITOR
SRM Top View
NO1
CM1
NC1
STA
STA Bottom View
NO2
CM2
CM3
NC2
NO3
NC3
AC/DC
POWER
RELAY 1 RELAY 2
RELAY 3-FAULT
GND
PLC/DCS
or Auxiliary
Monitoring
Device
Figure 5.2. SRM in SIL 1 and SIL 2 applications using Monitor output.
Safety Relay Module
SRM
SECTION 5
SIL 1 or SIL 2 Application using Monitor Output
The Monitor and Input contacts of the SRM may be connected to a PLC, DCS or other monitoring
device for diagnostic purposes.

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Safety Relay Module
SRM
SECTION 5
POWER
INPUT
OUTPUT
SAFETY
RELAY
MODULE
Jumper Wire
(Short)
Safety
PLC
or
DCS
Ground
24VDC
Relay/Contact Output
CC
CC
NC4
CM4
INPUT MONITOR
SRM Top View
24VDC
PLC/DCS
or Auxiliary
Monitoring
Device or
1A Load #4
Load #1
NO1
CM1
NO2
CM2
NO3
CM3
DC(+)
DCC(-)
GND
24VDC
POWER
CASE
SRM Bottom View
Load #2
Load #3
Figure 5.3. SRM in SIL 1 and SIL 2 applications when used with “wet” contact (24Vdc) input
SIL 1 or SIL 2 Application when used with “wet” Relay/Contact
Outputs
The Contact Closure (CC) input of the SRM is designed to accept a dry or volt free contact.
Applications that require hooking up the SRM to an output that includes a “wet” or voltage
(usually 24Vdc) contact output are shown in Figure 5.3.
In this instance the source relay output is used to apply power to the SRM rather than being
applied to the input of the SRM. By shorting the CC input terminals of the SRM, the outputs of
the SRM will be energized when the source relay output applies voltage to the SRM’s power
terminals. When the source relay output circuit opens, the SRM will be turned off and the output
relays will become de-energized.
In this application, the LEDs will be green when 24Vdc is applied and all LEDs will be dark when
0Vdc is applied.
Note: Output Relay signal source must be capable of providing and handling a load of 24Vdc
+/- 5% at 100mA.

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Section 6 - SRM in Safety Instrumented Systems
The SRM is designed for use as an element of the safety instrumented system as dened by IEC
61508-4 paragraph 3.4.1.
This user manual contains all of the information needed to install, operate and maintain this
product. For safety applications the SRM must only be used in accordance with this information
and the restrictions and limitations as detailed below.
Functional Safety Description
The SRM has been certied, by exida ® to IEC61508:2010 for systematic and random integrity
up to SIL2. This means that an SRM is approved for single use in Safety Instrumented Systems
(SIS) up to SIL2.
Failure Rate Data
The SRM FMEDA report (Moore Industries’ Document No: 700-702-35) provides the failure
data (including PFD and SFF) required for calculations to use the SRM as part of a Safety
Instrumented System.
Product life
The product life of the SRM primarily depends on contact life or number of operations. Figure
6.1 shows a graphical representation of number of operations versus switching current.
Contact life
Figure 6.1. SRM Contact Life Chart
10000
1000
100
10
0.1
Switching current (A)
24Vdc
230Vac
250Vac
No. of operations X 1000
0.5 1 2 3 4 5 6 7 8 9 10
Safety Relay Module
SRM
SECTION 6

www.miinet.com Moore Industries-International, Inc.
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User’s Manual
225-765-00G
April 2018
Installation
No special installation is required in addition to the standard installation practices in this user
manual. Refer to the specication table of this user manual for ambient conditions and required
power input.
Configuration
The SRM is a passive unit that requires no user conguration. For SIL 1 and SIL 2 applications,
it can be connected directly to a Safety Logic Solver such as the STA from Moore Industries.
For diagnostic purposes, the monitor relay and input signal may also be connected to a third-
party system (See Applications section for examples).
Visual Diagnostics
The SRM incorporates two (2) LED which indicate Input and Output status.
• Power LED – The Power LED is green when the appropriate input power is applied to the
SRM. An extinguished Power LED may indicate that the power fuse has been blown
and needs replacing, the power input is less than the appropriate amount or that no power is
currently applied to the unit.
• Input LED – When the SRM Input is open, the Input LED will be red. When the SRM Input
is closed, and the Input LED will turn green.
• Output LED – When the SRM Input is open, the Output LED will be red. When the SRM
Input is closed, the relay becomes energized and the Output LED will turn green.
The Input and Output LEDs provide a visual diagnostic for the SRM. Both LED colors should
always match unless there is a relay failure such as stuck contacts.
Note: Applications that require wiring the SRM’s CC input to a “wet” relay output (24Vdc) instead
of voltage free Contact Closure (see Applications Figure 5.3) will either show all green LEDs when
the contact/relay output is closed or all LEDs will be off (dark) when the contact/relay output is
open. If there are any red LEDs displayed then this indicates a relay failure or blown fuse.
Process Safety Time
Process safety time is the minimum time from the initiation of a hazardous event to the point
where the hazardous event is unavoidable. Any safety function designed to either prevent the
event or at least mitigate its e󰀨ect must be capable of performing its specied safety function in a
time period very much less than the process safety time.
The SRM has a characteristic response time (end-to-end) of <50mSec.
Safety Relay Module
SRM
SECTION 6