STI CM Series User manual

Operating Instructions for CM-Series Safety System
CM-Series Safety System
Description:
The CM Series is a tamper resistant non-contact safety
switch system, suitable for use in most types of machine
guarding applications where guard locking is not required.
The system consists of a control unit and 1 or more safety
switches and actuators.
The CM Series non-contact safety switches are easy to
install, tolerant to misalignment and suitable for use in
harsh or wet environments.
The 2-wire connection to each safety switch is
monitored by the control unit, detecting both open
and short circuit faults immediately and returning the
control unit to the off state even if the gate is not
operated.
CM-S41 Control Unit
The CM-S41 is a combined Safety Switch and E-Stop
control unit. Along with the ability to monitor up to four
CM Series safety switches it can also monitor the
normally closed contacts of emergency stop buttons or
mechanical safety switches in dual channel control
circuits. The CM-S41 has 2 normally open safety contact
outputs and 1 normally closed auxiliary output, an
external re-set/proving circuit and LED indication for
‘Power’, ‘Run’ and the status of each activated gate
switch.
CM-S21 Control Unit
The CM-S21 control unit is a 24V ac/dc system that can
monitor up to 2 CM Series safety switches. The CM-S21
has 2 normally open safety contact outputs and 1
normally closed auxiliary output, an external re-
set/proving circuit and LED indication for ‘Power’, ‘Run’
and the status of each activated gate switch.
CM-SE Extender Module
The CM-SE Extender module is a 24V ac/dc unit that
can be added to either the CM-S41 or CM-S21 to
monitor an additional 5 CM Series safety switches.
Connection to the main control unit is by a simple 2-wire
bus connection. The status of each guard switch is
shown by the YELLOW LEDs. Additional CMS-E
extender modules can be added to monitor larger
systems.
Safety Switches
The CM Series safety switches are non-contact, tamper
resistant safety switches. Resin encapsulated into an
ABS or Stainless Steel case providing environmental
protection to IP67, the switches can withstand most
conditions including: water, dust and high pressure hose
cleaning.
CM Series safety switches are also available with the
quick disconnect feature.
CAUTION (KEEP THIS GUIDE FOR FUTURE REFERENCE)
The information is designed to help suitably qualified personnel
install and operate Omron Robotics and Safety Technologies, Inc.
safety equipment. Before using this product, read this guide
thoroughly along with any relevant European and/or National
Standards E.g. Machinery Directive 2006/42/EC and its
Amendments, Provision and Use of Work Equipment Regulations.
Declaration of conformity and further product information can
be obtained from Omron Robotics and Safety Technologies,
Inc.
APPROVALS
CE
Complies with the relevant sections of the CE marking
directive.
UL
Tested by the Underwriters Laboratories, USA, to
comply with the relevant USA and Canadian
requirements. UL 508 Industrial Control
INTERNATIONAL DIRECTIVES
Machinery Directive 2006/42/EC, Low Voltage Directive 2006/95/EC
Electromagnetic Compatibility Directive 2014/30/EU
RoHS Directive 2011/65/EC
INTERNATIONAL STANDARDS
EN ISO 13849-1
Safety of Machinery
Safety related parts of controls systems.
EN ISO 62061
Safety of Machinery
Functional safety of safety related electrical, electronic
and programmable electronic controls systems.
EN 60204
Safety of Machinery
Electrical equipment of machines
EN 14119
Interlocking devices associated with guards.
EN 60947-5-1
Low voltage switchgear and control gear.
EN 60947-5-3
Safety of Machinery
Specification for low voltage switchgear and control
gear.
CERTIFICATE OF CONFORMITY
A certificate of conformity can be obtained from the STI Web Site
WWW.STI.COM

PRODUCT IDENTIFICATION AND TERMINAL LAYOUT
SYSTEM INSTALLATION
This installation guide is to help trained personnel to install the CM-Series non-
contact safety switch system. The CM-Series system is suitable for most types of
machine guarding applications where guard locking is not required.
The safety switches can be fitted to sliding, hinged or removable machine guards.
Comprised of a Safety Control Unit CM-S41/S21/SE and one or more Safety
Switch and Actuators, systems can easily be assembled to monitor 30+ machine
guards while retaining the high control category performance required in many
applications. (SIL3 PLe according to EN ISO 62061 & EN ISO 13849-1)
To assemble the system, mount the control unit in a suitably IP rated control panel
(Min IP54) and fix the safety switches to the gates as shown. Connect the safety
switches to the control unit. Using the appropriate selection table set the required
active gate inputs and reset options.
IMPORTANT: Always check the correct operation of all the safety functions
after installation and periodically through the life of the system. It is the
responsibility of the user to ensure safe and proper use of any safety

INSTALLING THE CONTROL UNIT
MOUNTING THE SWITCHES
The CM-Series control units are designed to fit standard 35mm symmetric
DIN rail.
TO FIT: Hook the unit onto the DIN rail (1) and gently push into place (2).
The catch should hold the unit securely in place.
TO REMOVE: Place the tip of a small screwdriver into the white catch at
the bottom of the box (1) and gently lever out. This releases the retaining
clip and allows the unit to be tilted (2) and removed (3).
INSTALLING THE SAFETY SWITCHES
The CM-Series safety switch sensors have 2 pre-drilled mounting holes
and are supplied with M4 x 20mm TORX Tamper Proof screws. (See page
7 for dimension details) The gate switches can approach each other from
any angle (A), but must end up with the arrows on the printed face
pointing towards each other. Mount the fixed part of the safety switch to
the machine frame and the actuator on to the opening edge of the door
(B). For the best results, mount the sensors with a gap of approximately
1mm. when the guard is closed. This gives a high level of lateral tolerance
to allow for ‘gate sag’ and freedom from nuisance tripping due to machine
/ guard vibration.
CONNECTING SWITCHES TO THE CONTROL UNIT
The CM-Series safety switches are supplied with 3 or 5 meters of cable
encapsulated into the switch. This ensures a completely water-tight
connection at the switch. Cables can be extended using the same type of
screened cable. Run the cable back to the control unit through cable
protection (if required) and terminate into the appropriate control unit input
channel. Follow the color coding of the wires to the labels on the control
unit input terminals. I.e. BLUE wire to BL and DRAIN wire to DR.
IMPORTANT: Use the GATE inputs in sequence. Examples:
One Guard System—Use input 1 on the CM-S21 (Or input 1 on the CM-S41 if E-Stop function required);
Three Guard System—Use inputs 1, 2 & 3 on the CM-S41;
Seven Guard System—Use inputs 1, 2 & 3 for Guard Switches on the CM-S41 and Input 4 to connect to the CM-SE Extender
module Bus connection. Then use inputs 1, 2, 3 & 4 on the CM-SE.
GUARD SELECTOR & RESET SWITCHES
The central part of the CM-Series control unit lid (1) is removable. Using a small
screwdriver in the recess (2) gently pry the lid upwards. This allows access to the
Automatic/Manual monitored Reset switch and the Guard Selector Switch. Using the
table next to the relevant control unit overleaf, set the CM-Series control unit to the
required number of guard switch inputs and type of reset required.
IMPORTANT: The number of inputs (safety switches) must match the gate selector
setting. The incorrect setting will stop the system from operating correctly.
1) Always try to mount the safety switch on non-ferrous material.
Ferrous materials will reduce the switching distance.
2) Leave a minimum 50mm gap between actuators. (A)
3) Avoid mounting the safety switch on the hinged side of the door,
as this may allow the door to be opened too far before the switch
de-activates. (B)
EN ISO 14119 provides some mounting suggestions, see
example (C). When fixing the switches to a sliding door, ensure
that when the door is opened the switch is not easily accessible.

CM-S41 CONNECTIONS
POWER SUPPLY:
24Vac/dc; 110Vac or 230Vac
POWER SUPPLY FUSING:
Internal resettable fuse with 2 second delay after fault removal.
INDICATION:
RED - Power On, GREEN - Run, YELLOW - Guard Status,
GREEN - Guard Selected status.
GUARD SELECTION:
See CM-S41 switch table.
RE-SET & MONITORING:
The X1, X2 circuit is for reset buttons and/or monitoring external
contactors.
Manual Reset: (see table) a normally open momentary push
button should be placed across X1 & X2. The push button must be
pressed and released as it is monitored for short circuit faults.
Automatic Reset: Link X1, X2 and the system will reset when all
active guards are closed.
Monitor External Contactors: (K1 & K2) Place a normally closed
contact off each contactor in series with X1 & X2 (with or without a
reset button as required) If either K1 or K2 welds during operation,
the other contactor will operate correctly and on the next demand
on the safety system the X1 X2 circuit will prevent a restart. Uses
relays with positively guided contacts for K1 & K2 if monitoring is
required.
CONTROL CONTACTS: Two sets of positively guided N/O safety contacts on terminals, 13, 14; and 23, 24 (rating 4 Amps).
One auxiliary N/C contact, (31-32). External fusing is recommended.
EMERGENCY STOP MONITORING: Dual channel emergency stop buttons and/or mechanical safety switches can be
monitored using the S13/S14 & S23/S24 circuits. If this feature is not used link terminals S13 to S14 and S23 to S24.
OPERATION: When power is applied to the control module, the RED ‘Power LED’ will illuminate. The GREEN ‘De-select’
indicators will show how many guard switch inputs are activated. NOTE: The number of inputs selected must match the number
of guard switches, otherwise the control unit will not operate. The YELLOW ‘Guard status’ indicators will be illuminated if the
guard is closed or be permanently on if the guard is de-selected. If all the monitored machine guards are closed, the
EMERGENCY STOP buttons (when used) are re-set, and the RE-SET button is pressed and released (Manual Re-set Option),
the control relays will energize closing the normally open safety contacts on terminals 13,14 / 23,24 and the normally closed
auxiliary contact 31 & 32 will open. The GREEN Run LED will illuminate. If set to automatic re-set (I.e. link in X1 & X2) the
control relays will energize when all active guards are closed and the emergency stop button(s) are re-set. Faults on the safety
switch cables, either open or short circuit will be detected immediately causing the control relays to de-energize.

CM-S21 CONNECTIONS
POWER SUPPLY:
24V ac/dc
POWER SUPPLY FUSING:
Internal resettable fuse with 2 second delay after fault removal.
INDICATION:
RED - Power On, GREEN - Run, YELLOW - Guard Status,
GREEN - Guard Selected status.
GUARD SELECTION:
See CM-S41 switch table.
RE-SET & MONITORING:
The X1, X2 circuit is for reset buttons and/or monitoring external
contactors.
Manual Reset: (see table) a normally open momentary push button should
be placed across X1 & X2. The push button must be pressed and released
as it is monitored for short circuit faults.
Automatic Reset: Link X1, X2 and the system will reset when all active
guards are closed.
Monitor External Contactors: (K1 & K2) Place a normally closed contact
off each contactor in series with X1 & X2 (with or without a reset button as
required) If either K1 or K2 welds during operation, the other contactor will
operate correctly and on the next demand on the safety system the X1 X2
circuit will prevent a restart. Use relays with positively guided contacts for
K1 & K2 if monitoring is required.
CONTROL CONTACTS: Two sets of positively guided N/O safety contacts on terminals, 13, 14; and 23, 24 (rating 4 Amps).
One auxiliary N/C contact, (31-32). External fusing is recommended.
OPERATION:
When power is applied to the control module, the RED ‘Power LED’ will illuminate. The number of inputs selected
must match the number of guard switches, otherwise the control unit will not operate. The YELLOW ‘Guard status’
indicators will be illuminated if the guard is closed or be permanently on if the guard is de-selected. If all the
monitored machine guards are closed and the RE-SET button is pressed and released (Manual Re-set Option), the
control relays will energize closing the normally open safety contacts on terminals 13,14 / 23,24 and the normally
closed auxiliary contact 31 & 32 will open. The GREEN Run LED will illuminate. If set to automatic re-set (I.e. link in
X1 & X2) the control relays will energize when all active guards are closed and the emergency stop button(s) are
re-set. Faults on the safety switch cables, either open or short circuit will be detected immediately causing the
control relays to de-energize.

CM-SE CONNECTIONS
POWER SUPPLY:
24Vac/dc
POWER SUPPLY FUSING:
Internal resettable fuse with 2 second delay after fault removal.
INDICATION:
RED - Power On.
YELLOW - guard status indicators.
GUARD SELECTION:
See CM-SE Guard selection chart.
CONNECTION TO MAIN CONTROL UNIT:
The CM-SE can be connected to any active guard switch input on
a CM-S21 or CM-S41.
Connect the 2-wire BUS (BL DR) terminals on the CM-SE
module to any activated guard input on the main control module.
(Max distance 100 meters) For larger systems further CM-SE
extender modules can be connected to active guard switch inputs
on a CM-SE extender module.
OPERATION:
When power is applied to the control module, the RED ‘Power Led’ will illuminate. The number of inputs selected must match
the number of guard switches, otherwise the control unit will not operate. The YELLOW ‘Guard status’ indicators will be
illuminated if the guard is closed or be permanently on if the guard is de-selected. If all the monitored machine guards are
closed and the RE-SET button is pressed and released on the main control unit, the control relays will energize and the
normally open safety contacts on terminals 13,14 / 23,24 (main control unit) will close. The normally closed auxiliary contact
31 & 32 (main control unit) will open. If set to automatic re-set (i.e. link in X1 & X2) the control relays will energize when all
active guards are closed and the emergency stop button(s) (if connected) are re-set. Faults on the safety switch cables, either
open or short circuit will be detected immediately causing the control relays to de-energize.

Dimensions
CM-S41 (ALL VOLTAGES)
CM-S21 / CM-SE
CM-SERIES SAFETY SWITCHES
Dimensions
CM-S41
(mm/inches)
W
75 / 2.95
H
74 / 2.91
D
119 / 4.68
Dimensions
CM-S21 & CM-SE
(mm/inches)
W
22.5 / 0.88
H
84 / 3.3
D
119 / 4.68

Technical Specification
Technical Specifications
CONTROL UNITS
SAFETY SWITCHES
CM-S41
CM-S21
CM-SE
CM-S11
CM-S31
Supply nominal voltage
24Vac/dc
24Vac/dc
24Vac/dc
-
-
110 or 230Vac
Nominal power consumption
6VA
3VA
3VA
-
-
Safety contacts
2 x N/O
-
-
-
Auxiliary contact
1 x N/C
-
-
-
Output contact rating (max)
4A/230Vac; 2A/24Vdc(Res)@Cos=1
-
-
-
Output contact rating (min)
10V/10mA
-
-
-
Output contact fuse rating
AC=5A; DC=2.5A; Quick blow
-
-
-
Drop out time
Deactivation by sensor 13ms
-
-
-
Nominal voltage across
BL/DR sensor
ON: 4V; OFF 0 to 10Vdc
-
-
Internal fuse
500mA Resettable
-
-
Internal fuse recovery time
>2 Seconds
-
-
Internal switches
Active gate selector; Manual or
Monitored reset selection
Active gate
selector
-
-
Max conductor size
1 x 2.5mm stranded with sleeves, 1 x 4mm solid
-
-
Installation group (Control
unit)
C in accordance with VDE0110
-
-
Contamination level
III
-
-
Vibration resistance
Amplitude 2mm, frequency 10 to 55 Hz
-
-
Enclosure protection
Housing IP40, Terminals IP20
IP67
Switching distance
-
-
-
5-7mm ON; 8-12mm OFF
Minimum gap
-
-
-
Minimum gap
Operating temperature
-10C to +55C (85% Humidity max)
-10C to +55C
Housing material
Polycarbonate Red
ABS Red
316 Stainless
Steel
Mounting / Fixing
35mm Symmetric DIN Rail
22mm Centres;
M4 security screws supplied
Safety Related Data
PL in accordance with EN ISO 13949-1
PL e, CAT 3
SIL in accordance with EN ISO 62061
SIL 3
PFHd in accordance with EN ISO 62061
3.37 x 10-8
PFH
5.63 x 10-8
B10d
2,000,000
MTTFd
High > 100 Years (Based on usage rate of 360 Days/Year, 24 Hours/Day, 10
Operations/Hour)
TM (Mission Time)
20 Years
DC
99%
SFF
99.40%
Document Number: 570-400-Iss6
Specification Changes
In the interest of product development, specifications are
subject to change without notice.
OMRON Robotics and Safety Technologies, Inc
4225 Hacienda Drive
Pleasanton, CA 94588
USA
Tel: [phone]
Web: www.omron247.com
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Omron Robotics and Safety Technologies, Inc 2020. All rights reserved