CE marked for all applicable directives, UL and C-UL.
TUV certified: CM-S1, CM-S2, CM-S3, CM-S11 and CM-S31.
Specifications are subject to change without notice.
Note: The safety contacts of the STI switches are described as normally closed (N/C) i.e., with the guard closed, actuator in place, and
the machine able to be started.
Humidity:
Compliance
Standards:
Approvals/Listings:
95% RH at 55°C (131°F)
Select models are available for Rapid Delivery.
Visit this product on www.sti.com for details.
G-64
www.sti.com/info
CM Series
Safety Interlock Switches
Control Unit Specifications
Electrical
Power Supply:
Power Consumption:
Input Fuse:
Safety Inputs:
CM-S4
24 VAC/DC ± 10%
2.4 VA typical, 0.25 A quick acting
500 mA resetable
1 N/O + 1 N/C
CM-S30
24 VAC/DC ± 10%
120 mA
750 mA resetable
1 N/O + 1 N/C
CM-S41, CM-S21 & CM-SE
CM-S41 — 24 VAC/DC, 110/230 VAC
CM-S21 & CM-SE — 24 VAC/DC
CM-S41 — 6 VA;
CM-S21 & CM-SE — 3 VA
500 mA resetable
CM-S41 —
4 CM-S11 or CM-S31 switches
CM-S21 —
2 CM-S11 or CM-S31 switches
CM-SE — 5 CM-S11 or CM-S31 switches
100 m (328 ft.)
Contact factory
CM-S41 & CM-S21 — 2 N/O;
CM-SE — N/A
4 A / 230 VAC; 2 A / 24 VDC (resistive)
10 V / 10 mA
250 V
Deactivation by sensor 13 mS
AC = 5 A; DC = 2.5 A; quick acting
Monitored manual or automatic
N/C loop between X1 and X2
35 mm (1.38 in.) DIN rail
Polycarbonate
1 x 2.5 mm
2
stranded, 1 x 4 mm
2
solid
CM-S41 — 575 g (20.3 oz.)
CM-S21 — 183 g (6.5 oz.)
CM-SE — 135 g (4.8 oz.)
Red
Power = Red
Outputs Closed: Green = On
Outputs Open: No Light = Off
Gate Closed: Yellow = On
Gate Open: No Light = Off
1 x 10
6
Housing IP40, Terminals IP20
10 to 55°C (50 to 131°F)
85%
Max Cable Length:
Max Input Resistance:
Relay Outputs:
Max Switched Current/Voltage:
Min Switched Current/Voltage:
Impulse Withstand Voltage:
Max Drop-Out Time:
Max Output Fuse:
Reset Mode:
External Device Monitoring:
Mechanical
Mounting:
Case Material:
Max Wire Size:
Weight:
—
Contact factory
1 N/O safety + 1 N/O aux.
4 A / 24 VAC/DC
4 mA / 12 V
250 V
18 ms
4 A quick acting
Automatic
N/C loop between Y1 and Y2
35 mm (1.38 in.) DIN rail
Polyamid PA6.6
2 x 2.5 mm
2
(12 AWG)
240 g (8.5 oz.)
—
Contact factory
2 N/O safety + 1 N/C aux.
3 A / 24 VAC/DC
4 mA / 12 V
250 V
18 ms
4 A quick acting
Automatic/Manual, monitored
Between Y1, Y2, Y3
35 mm (1.38 in.) DIN rail
Polyamid PA6.6
1 x 2.5 mm
2
(14 AWG)
230 g (8.1 oz.)
G
Color:
Indication:
EN292, EN60204-1, EN954-1,EN1088,
EN60947-5-3, EN947-5-3, EN50081,
EN50082, EN61000-6-2
Approvals/Listings:
CE marked for all applicable directives, UL and C-UL, TUV (TUV pending for CM-S30)
Safety Category:
Cat 3 per EN954-1
Cat 4 per ISO 13894-1
Cat 3 per EN954-1
(internal operation)
(internal operation)
(internal operation)
Specifications are subject to change without notice.
Note: The safety contacts of the STI switches are described as normally closed (N/C) i.e., with the guard closed, actuator in place, and the machine able to
be started.
Mechanical Life:
Environmental
Protection:
Operating Temperature:
Humidity:
Compliance
Standards:
Grey
U: Green = On
Outputs Open: Red = On
Outputs Closed: Green = On
D11, D12, D21, D22: Green = Gate closed
D31, D32, D41, D42: Red = Gate open
3 x 10
7
Housing IP40, Terminals IP20
0 to 50°C (32 to 122°F)
95%
Red/Grey
Green = Power On
Green = K1 On
Green = K2 On
1 x 10
7
Housing IP40, Terminals IP20
0 to 55°C (32 to 131°F)
93%
EN292, EN60204-1, ISO 13849-1, EN1088, EN60947-5-3, EN947-5-3,
EN50081, EN50082, EN61000-6-2
Select models are available for Rapid Delivery.
Visit this product on www.sti.com for details.
www.sti.com/info
G-65
CM Series
Safety Interlock Switches
Applications
2-Wire Single Channel Controllers
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, 2-wire 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 reset/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 24 VAC/DC system that can moni-
tor 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 reset/proving circuit
and LED indication for “Power”, “Run” and the status of each
activated gate switch.
CM-SE Extender Module
The CM-SE expansion module is a 24 VAC/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 LED’s. Additional CMS-E
modules can be added to monitor larger systems.
CM-S21 Application Diagram
24V
(+ve)
GS1
G
A1 X1 BL DR 31 13 23
GATE 1
POWER
IND 1
IND 2
RUN
K1
K2
MANUAL
RE-SET
GATE 2
A2 X2 BL DR 32 14 24
F1
GS2
0V
(-ve)
K1
K2
K1
K2
CM-S41 Application Diagram
CM-SE Application Diagram
L (+ve)
GS1 GS2
24 V
+ve
Extender Module
GS1 GS2 GS3
F2
Control Unit
MECHANICAL
SAFETY
SWITCHES
or
EMERGENCY
STOP
A1 S13 S23 X1 BL DR BL DR 31 13 23
GATE 1 GATE 2
K1
K2
A1 DR BL DR BL DR BL
GATE 1 GATE 2 GATE 3
POWER
IND 1
IND 2
IND 3
IND 4
A1
POWER
1
RUN
2
DE-SELECT
GATE 2
GATE 3
GATE 4
3
4
MANUAL
RE-SET
GATE 4 GATE 5
IND 5
ISIS-4 or ISIS-2
CM-S41 / CM-S21 Control
CONTROL UNIT
Units:
Connect the CM-SE Bus
Connect the ISIS-E
connection to an active
to
Bus connection
gate input.
A2
BL DR
BUS
GATE 3 GATE 4
A2 S14 S24 X2 BL DR BL DR 32 14 24
A2 DR BL DR BL DR BL
F1
F2
GS4 GS5
K1
K2
GS3 GS4
K1
N (-ve)
K2
0V
-ve
2-WIRE BUS CONNECTION
G-66
www.sti.com/info
CM Series
Safety Interlock Switches
Applications (continued)
Dual Channel Controllers
CM-S4 Control Unit
The CM-S4 controller is capable of monitoring up to four,
magnetically coded switches with 1 N/O + 1 N/C contacts up to
category 3 according to EN954-1. The CM-S4 has a dedicated
dual channel input for each switch and has LED status indicators
for each channel. The CM-S4 has 1 N/O safety contact and 1 N/O
Aux contact. External Device Monitoring (EDM) is available using
Y1,Y2 inputs.
CM-S30 Control Unit
The CM-S30 controller is capable of monitoring one magneti-
cally coded switch with 1 N/O + 1 N/C contacts up to category
4, or two switches to category 3 according to ISO 13489-1. The
CM-S30 control unit is capable of monitoring up to 30 convention-
al read style switches in series, but does not conform to category
4 when used with more than two switches. The CM-S30 controller
has 2 N/O safety contacts and 1 N/C Auxiliary contact. External
Device Monitoring (EDM) is available using Y1,Y2 inputs.
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