QUESTION:
Which LWL cable types can be used for ET 200M-FO modules?

ANSWER:  
The following cable types are available for ET 200M-FO modules:

FOC cable type	Ordernumber
SIMATIC NET PROFIBUS  Plastic Fibre Optic, duplex core  (50m ring)	6XV1 821-2AN50
SIMATIC NET PROFIBUS  Plastic Fibre Optic, standard line	6XV1 821-0AH10 (running meter) 6XV1 821-0AH50 (50 m ring) 6XV1 821-0AT10 (100 m ring)
SIMATIC NET PROFIBUS  PCF Fibre Optic, standard line, various length from 50 m to 300 m	6XV1 821-1Cxxx

Note:
Further information can be found in the manual "SIMATIC Distributed I/O Device ET 200M" under entry ID: 1142798.