Moore Industries SRM User Manual

No. 225-765-00G

April 2018

Safety Relay Module

SRM

SRM

User’s Manual

225-765-00G

Safety Relay Module

April 2018

Demand Moore Reliability

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.

Customer Support

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.

Locations

World Headquarters Europe Australia

16650 Schoenborn Street
North Hills, California
91343-6196, U.S.A.
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
TOLL FREE: 1-800-999-2900

www.miinet.com

China

Room 102, No. 101,
Lane 1058, Xinzhen Street,
Xinqiao Town, Songjiang District,
Shanghai, 201612, P. R. China
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]

www.miinet.com/cn

1 Lloyds Court, Manor Royal, Crawley
W. Sussex RH10-9QU

United Kingdom

Tel: [phone]
Fax: [phone]
FREE PHONE: [phone]
[e-mail]

www.miinet.com/uk

Guido Gezellestraat 106
BE-2630 Aartselaar

Belgium

Tel: [phone]
Fax: [phone]
[e-mail]

Dutch: www.miinet.com/dbe
French: www.miinet.com/fbe

Burg Meslaan 98
4003 CD Tiel

The Netherlands

Tel: [phone]
Fax: [phone]
[e-mail]

www.miinet.com/nl

Sydney, NSW
3/1 Resolution Drive
Caringbah, New South Wales 2229

Australia

Tel: [phone]
Fax: [phone]
[e-mail]

www.miinet.com/au

Perth, WA
6/46 Angove Street
North Perth, Western Australia 6006

Australia

Tel: [phone]
Fax: [phone]
[e-mail]

www.miinet.com/au

www.miinet.com

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User’s Manual
225-765-00G
April 2018

Safety Relay Module

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.

SRM

About this Manual

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.

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www.miinet.comMoore Industries-International, Inc.

SRM

Safety Relay Module

Table of Contents

Section 1 - Introduction 6

Description ................................................................................................................ 6

Model Numbers and Options ...................................................................................6

SRM Safety Relay Module .......................................................................................................... 7

CONTENTS

Section 2 - Calibration Bench Check 8

Calibration ................................................................................................................. 8

Bench Check Procedure .......................................................................................... 8

Section 3 - Installation and Wiring 10

Terminal Designations ...........................................................................................10

Dimensions ............................................................................................................. 11

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April 2018

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

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User’s Manual
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April 2018

SRM

Safety Relay Module

Table of Contents

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

CONTENTS

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

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www.miinet.comMoore Industries-International, Inc.

SRM

Safety Relay Module

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

SECTION 1

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.

User’s Manual

225-765-00G

April 2018

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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User’s Manual
225-765-00G
April 2018

SRM

Safety Relay Module

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.

SECTION 1

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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SRM

Safety Relay Module

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.

SECTION 2

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

User’s Manual

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April 2018

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Moore industries-International, Inc.

User’s Manual

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

.

225-765-00G
April 2018

SRM

Safety Relay Module

Table 2.1. Bench Check Equipment for the SRM.

Figure 2.1. SRM Front Panel LEDs

SAFETY
RELAY
MODULE

POWER

INPUT

OUTPUT

SECTION 2

Power LED

Input LED

Output LED

Figure 2.2. Bench Check Set-up

20 Ω

SAFETY
RELAY
MODULE

POWER

INPUT

OUTPUT

Ground

–

24Vdc
Power

+

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SRM

Safety Relay Module

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

SECTION 2

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.

Terminal Designations

Figure 3.1. Terminal Designations

CC NO1

CC

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April 2018

NOT

USED

NOT

USED

NC4

CM4

VIEWED FROM TOP VIEWED FROM BOTTOM

NO1

CM1

NO2

CM1

NO2

CM2

NO3

CM3

DC(

GND

DCC(

NOT

USED

NOT

USED

+

-

)

)

INPUT MONITOR

CC

CC

KEY:
DC = Power Input (+)
DCC = Power Input (-)
CM = Relay Common
GND = Ground

NOTES:

1. Terminal blocks can accommodate 14-22 AWG solid wiring.

CM4

NC4

NO = Normally Open
NC = Normally Closed

DC(+)

24VDC

POWER

NO3

CM2

CM3

DCC(-)

CASE

GND

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Moore industries-International, Inc.

User’s Manual
225-765-00G
April 2018

SRM

Safety Relay Module

Dimensions

Figure 1. The SRM Dimensions

119mm

(4.7 in)

130mm

(5.15 in)

100mm

(3.94 in)

35mm

(1.4 in)

SAFETY
RELAY
MODULE

POWER

INPUT

OUTPUT

SECTION 3

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.

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SRM

Safety Relay Module

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.

SECTION 3

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.

User’s Manual

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April 2018

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 (2mm2 or

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.

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User’s Manual
225-765-00G
April 2018

SRM

Safety Relay Module

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.

SECTION 3

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.

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SRM

Safety Relay Module

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.

SECTION 4

Depending upon environmental conditions, it can be expected to operate unattended for
extended periods of time.

Figure 4.1. SRM Front Panel LEDs

SAFETY
RELAY
MODULE

User’s Manual

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April 2018

POWER

INPUT

OUTPUT

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
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).

Open terminals are closed and the Monitor terminal is open, the

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.

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User’s Manual
225-765-00G
April 2018

SRM

Safety Relay Module

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)

Figure 4.2. Fuse Locations

SECTION 4

MONITOR

F205

NO1

F202

NO2

NO3

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.

F203

F204

F201

POWER

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SRM

Safety Relay Module

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.

User’s Manual

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April 2018

SECTION 5

Figure 5.1. SRM in SIL 1 and SIL 2 applications

NO3

RELAY 3-FAULT

CM1

NO1

RELAY 1 RELAY 2

STA Bottom View

NC3

CM3

NC1

NO2

CM2

NC2

STA

AC/DC

POWER

SRM Top View

INPUT MONITOR

CC

CC

SAFETY
RELAY
MODULE

POWER

INPUT

OUTPUT

GND

Ground

+

24Vdc
Power

Load #1

NO1

CM1

SRM Bottom View

Load #2

NO2

POWER

DC(+)

24VDC

CM2

CM4

NC4

Load #3

NO3

CM3

DCC(-)

CASE

GND

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User’s Manual

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

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April 2018

SRM

Safety Relay Module

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.

Figure 5.2. SRM in SIL 1 and SIL 2 applications using Monitor output.

SECTION 5

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SRM

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

Safety Relay Module

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

SECTION 5

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.

User’s Manual

225-765-00G

April 2018

Figure 5.3. SRM in SIL 1 and SIL 2 applications when used with “wet” contact (24Vdc) input

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User’s Manual

No. of operations X 1000

225-765-00G
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SRM

Safety Relay Module

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.

SECTION 6

Contact life

Figure 6.1. SRM Contact Life Chart

10000

1000

100

10

0.1

0.5 1 2 3 4 5 6 7 8 9 10

Switching current (A)

24Vdc
230Vac

250Vac

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SRM

Safety Relay Module

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,

SECTION 6

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 third­party 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.

User’s Manual

225-765-00G

April 2018

• 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.

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User’s Manual
225-765-00G
April 2018

SRM

Safety Relay Module

Proof Test Procedure

It is normal practice with SIS that the components undergo periodic proof tests to expose
dangerous faults that are not detected by internal diagnostic tests. Thus, this section species

how the dangerous undetected faults determined during the FMEDA can be detected during
proof testing.

Calculation of the required proof test interval can be made using data in the FMEDA report

(Moore Industries’ Document No: 700-702-35).

The proof tests described in Table 6.1 cover all possible dangerous undetected faults.

Periodically testing the SRM, using the proof test steps outlined below, the accumulated PDFAVG
value can be reduced to zero.

Repair and Replacement

The SRM has replaceable fuses (see Maintenance section). After replacing any fuses, it is

recommended to run the proof test procedure before returning the unit back to service. Except

for the fuses, the SRM is not intended to be repaired on site and has no components needing
maintenance or regular replacement. On device failure, the SRM should be returned to Moore
Industries World Headquarters in North Hills, CA U.S.A. for repair and refurbishment (refer to
Returns Procedures at the end of this manual).

Warning: Replacement fuses must be exactly the same size, type, voltage and current rating
as specified in the Maintenance section. Any deviations could create a safety hazard and will
invalidate any remaining warranty.

With the exception of fuses, repair or replacement of any component without authorization from

Moore Industries will invalidate any remaining warranty.

SECTION 6

Recording and Reporting of SRM Performance

It is the end user’s responsibility to maintain records of all safety components failures, especially

those that might be classied as potentially dangerous.

This feedback data not only helps the supplier identify and rectify reliability issues but also to

provide quantitative data to increase condence in the FMEDA analysis of dangerous failure

rates. Please ensure that any components returned to Moore Industries are returned with a clear

report identifying the fault experienced.

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SRM

Safety Relay Module

Table 6.1. SRM Proof Test Steps

Step Action

1

Bypass the safety logic solver or take other appropriate action to avoid a false trip.

Disconnect all wires from SRM. Using an ohmmeter, measure the resistance between
the case and all exposed pins on the front panel. Verify that the measured resistance is greater

2

than 1MΩ

Note: this test for shorts between the power or ground to the case.

Supply 24Vdc power to SRM

SECTION 6

3

Install one (1) 2k ohm (1/2W) resistor to each Common (CM) terminal. Connect remaining
end of resistors to 24Vdc +/-5% . Finally connect each remaining terminal (NC or NO) to

4

24Vdc Return.

Note: This circuit will pass 12mA through each relay contact.

Using voltmeter, measure voltage across each of the three (3) normally open terminals and verify

5

that the measured voltage is between 22.8 and 25.2Vdc.

Using voltmeter, measure voltage across the normally closed terminal and verify that the measured

6

voltage is less than 0.1V..

Apply a short across the CC Input Terminal.

7

Using voltmeter, measure voltage across each of the three (3) normally open terminals and verify

8

that the measured voltage is less than 0.1V.

Using voltmeter, measure voltage across normally closed terminal and verify that the measured

9

voltage is between 22.8 and 25.2Vdc.

10

Switch o or disconnect power to SRM.

Using voltmeter, measure voltage across each of the three (3) normally open terminals and verify

11

that the measured voltage is between 22.8 and 25.2Vdc.

Using voltmeter, measure voltage across the normally closed terminal and verify that the measured
voltage is less than 0.1V.

12

Note: Step 9-11 veries SRM will fail safe.

Reconnect SRM to original connection.

13

14

Remove the bypass from the safety logic solver or otherwise restore normal operaton.

User’s Manual

225-765-00G

April 2018

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User’s Manual
225-765-00G
April 2018

SRM

Safety Relay Module

Section 7 - Specications

Performance

Input Type

Output Type

Power Consumption: 1.5W,

typical; 2.3W Max

Response Time:

20ms typical, 50ms Max.
Isolation: 1500Vrms between;

power and Input to each output,
power and input to case, case to
output

Power: 24Vdc -5% to +10%

Contact Closure: (CC) 24Voc,

Isc 55mA, Includes diode
suppression of relay coil

Three (3) fuse protected
Normally Open Terminals:

250Vac/30Vdc 5A(resistive)

One (1) fuse protected
Normally Closed Terminal:

250Vac/30Vdc 1A (resistive)

Ambient

Conditions

Indicators

Weight

SECTION 7

Operating Range:

-20°C to +70°C
(-4°F to +158°F)

Relative Humidity:

5-95% non-condensing

RF Standards: Meets

IEC61326-1 and IEC61326-3

(Functional Safety)

RFI/EMI Protection: RF

immunity at 20V/m,
20-1000MHz, when tested to
IEC61000-4-3

Power: Green (ON) when the

appropriate power is applied.
Input: Green when CC terminal
closed; Red when CC terminals
are open.

Output: Green when the NO
terminals are closed and the NC
terminals ares open; Red when
the NO terminals are open and
the NC terminals are closed.

328.9g (11.6oz)

Specifications and Information subject to change without notice.

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SRM

Safety Relay Module

Section 8- Ordering Information

The SRM ordering information is detailed below.

User’s Manual

225-765-00G

April 2018

Unit

SRM

Safety
Relay
Module

CC

Contact
Closure

SECTION 8

When ordering, specify: Unit / Input / Output / Power / Options [Housing]
Model number example: SRM / CC / 3RO / 24DC [DIN]

Accessories

Part Number

700-702-35

FMEDA Report consistent with IEC 61508-2:2002 providing the information necessary to design a Safety Instrumented
System (One copy provided free with each order Upon Request).

Input Output

3RO Three (3)

Relay Outputs

Power

24DC

Options

None

Housing

DIN DIN-style housing mounts on

35mm (EN50022)
Top Hat DIN-rails

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Warranty Disclaimer

United States • [e-mail]

Tel: [phone] • FAX: [phone]

Australia • [e-mail]

Tel: [phone] • FAX: [phone]

Belgium • [e-mail]

Tel: [phone] • FAX: [phone]

The Netherlands • [e-mail]

Tel: [phone] • FAX: [phone]

China • [e-mail]

Tel: [phone] • FAX: [phone]

United Kingdom • [e-mail]

Tel: [phone] • FAX: [phone]

Moore Industries (“The Company”) makes no express, implied or statutory warranties (including any warranty of merchantability or
of tness for a particular purpose) with respect to any goods or services sold by the company. The company disclaims all warranties

arising from any course of dealing or trade usage, and any buyer of goods or services from the company acknowledges that there
are no warranties implied by custom or usage in the trade of the buyer and of the company, and that any prior dealings of the buyer
with the company do not imply that the company warrants the goods or services in any way.

Any buyer of goods or services from the company agrees with the company that the sole and exclusive remedies for breach of any

warranty concerning the goods or services shall be for the company, at its option, to repair or replace the goods or services or refund
the purchase price. The company shall in no event be liable for any consequential or incidental damages even if the company fails
in any attempt to remedy defects in the goods or services , but in such case the buyer shall be entitled to no more than a refund of all
monies paid to the company by the buyer for purchase of the goods or services.

Any cause of action for breach of any warranty by the company shall be barred unless the company receives from the buyer a
written notice of the alleged defect or breach within ten days from the earliest date on which the buyer could reasonably have
discovered the alleged defect or breach, and no action for the breach of any warranty shall be commenced by the buyer any later

than twelve months from the earliest date on which the buyer could reasonably have discovered the alleged defect or breach.

Return Policy

For a period of thirty-six (36) months from the date of shipment, and under normal conditions of use and service, Moore Industries
(“The Company”) will at its option replace, repair or refund the purchase price for any of its manufactured products found, upon

return to the Company (transportation charges prepaid and otherwise in accordance with the return procedures established by

The Company), to be defective in material or workmanship. This policy extends to the original Buyer only and not to Buyer’s
customers or the users of Buyer’s products, unless Buyer is an engineering contractor in which case the policy shall extend to

Buyer’s immediate customer only. This policy shall not apply if the product has been subject to alteration, misuse, accident, neglect
or improper application, installation, or operation. THE COMPANY SHALL IN NO EVENT BE LIABLE FOR ANY INCIDENTAL OR
CONSEQUENTIAL DAMAGES.

To return equipment to Moore Industries for repair, follow these four steps:

1. Call Moore Industries and request a Returned Material Authorization (RMA) number.

Warranty Repair –

If you are unsure if your unit is still under warranty, we can use the unit’s serial number to verify the warranty status for you

over the phone. Be sure to include the RMA number on all documentation.

Non-Warranty Repair –

If your unit is out of warranty, be prepared to give us a Purchase Order number when you call. In most cases, we will be

able to quote you the repair costs at that time. The repair price you are quoted will be a “Not To Exceed” price, which means

that the actual repair costs may be less than the quote. Be sure to include the RMA number on all documentation.

2. Provide us with the following documentation:

a) A note listing the symptoms that indicate the unit needs repair

b) Complete shipping information for return of the equipment after repair

c) The name and phone number of the person to contact if questions arise at the factory

3. Use sufficient packing material and carefully pack the equipment in a sturdy shipping container.

4. Ship the equipment to the Moore Industries location nearest you.

The returned equipment will be inspected and tested at the factory. A Moore Industries representative will contact the person
designated on your documentation if more information is needed. The repaired equipment, or its replacement, will be returned to
you in accordance with the shipping instructions furnished in your documentation.

© 2015 Moore Industries-International, Inc.

Specifications and Information subject to change without notice.