Light Curtain
SF2-A
Safety Relay Unit
446
SF2
-
A
SERIES
Small Light Curtain
Bringing world-class
safety standards even
closer to you
Type 2
Standard type
Approved Listing
Conforming to
Machine Directive &
EMC Directive
Self-diagnosis
Diagnosis
Test input PNP output
type available
High level of safety achieved
Application of IEC 61496 (Type 2) international standard
The SF2-A series conforms to
European and North American safety
standards. So, they can be used in
workplaces throughout the world.
The sensor carries out self-diagnosis when it is turned ON.
The monitoring section (CPU) which is inside the emitter constantly checks the
emitting circuit and the control circuit. Furthermore, the receiver also has a
monitoring section (CPU) which constantly checks the receiving circuit, control
circuit and output circuit, so that a high level of safety is maintained at all times.
Conforming to
Machine Directive &
EMC Directive
Approved Listing
CE marking based on Machine Directive
and EMC Directive has been obtained,
so that the sensors can be used in
Control Category 2 equipment.
Type 2 based on IEC 61496-1/2, EN
61496-1 and Control Category 2
based on EN 954-1
C-UL US listings (UL 61496-1/2) which
are required for use in the United States
and Canada have been obtained.
Europe
North
America
Emitter
Receiving circuit
Receiver
Control circuit
Output circuit
Alarm
output
OSSD
(control output)
Test input
Monitoring
section (CPU)
Emitting circuit
Alarm output
Control circuit
Monitoring
section (CPU)
Check
Check
Check
Check
Synchronization line
Emitting
element failure
Emitting
circuit failure
Cable breakage /
short-circuit
Receiving
element failure
Receiving
circuit failure
Output transistor
failure
CPU malfunction
Extraneous light
Cable breakage /
short-circuit
Safety design of the SF2-A series
•
The sensor switches to the lockout mode when an error occurs, so that the OSSD
(control output) and alarm output turn OFF.
•
The output circuit is constantly monitored, so that the sensor also locks out if one of the
transistors is short-circuited.
•
Self-diagnosis using test input allows detailed checking such as overlapping emission
(overcurrent error), light emission strength, etc.
Type 2
Stable incident beam indicator
After modifications
Lights up in green
Off
Off
Off
Lights up in orange
Lights up in orange
Off
When light received is stable
(Amount of light received more than 140 % approx.)
When light received is stable
(Amount of light received 115 to 140 % approx.)
When light received is unstable
(Amount of light received 100 to 115 % approx.)
When light is interrupted
(when OSSD is off)
Off
Previous products
We changed unstable incident beam indicator (orange LED) to stable
incident beam indicator (orange / green LED) from the production in June,
2003.
By this change, you can see more stable state of incident beam at a
glance, and you can align beam axis accurately.
[Operation of stable incident beam indicator (EX-unstable incident beam indicator)]
Ramco Innovations - 1207 Maple Street, West Des Moines IA USA 50265 - 800-280-6933 - www.ramcoinnovations.com
