What are the main differences between F3SN-A Safety Light Curtain and F3SN-B?

Item F3SN-A Series F3SN-B Series
Type
(Categories based on
IEC 61496-1)
Type 4 Type 2
Applicable categories
(Categories based on
EN 954-1)
B, 1, 2, 3, and 4 B, 1, and 2
Effective aperture angle
(I.e., directional angle)
(Requirements based on
IEC 61496-2)
±2.5° max, ±5° max,
Self-test Frequency of
execution
Once per 10 to 15.5 ms max. Once per 1 s max.
Items
monitored
Emitter
CPU runaway
Emitter element damage
Emitter circuit damage
Cable disconnection and short-circuiting

Receiver
CPU runaway
Power supply and circuit damage
Receiver element damage
Receiver circuit damage
External light interference received
Output drive circuit damage
Cable disconnection and short-circuiting
Same as at left.
CPU 2 (circuit redundancy) 2 (circuit redundancy)
Series connection and
mutual interference 
prevention
Up to 3 Sets (total optical axes: 240) can be connected in series.
Mutual interference prevention only when series connection is used.
Series connection is not possible.
No mutual interference prevention.
Protective height 189 to 1,822 mm 217 to 1,807 mm
Smallest detectable object 14-mm dia., 25-mm dia., 40-mm dia., 70-mm dia. 25-mm dia., 40-mm dia., 70-mm dia.
Total failures No hazard for up to 3 failures No hazard for up to 1 failures
Safety-related
Functions
Interlock Function
Fixed Blanking Function
Floating Blanking Function
External Device Monitoring
Interlock Function
External Device Monitoring
Output operation mode
for auxiliary output
Can be set with F39-MC11 Setting Console. Always Dark-ON
Use of F39-MC11
Setting Console
Supported Not supported