R911309839 is part of the CDB Drive Controllers Series by Indramat Drives.
Specs
Product: Rexroth IndraDrive Drive Controller
Type: Double-Axis Control Section
Control Section Range: BASIC UNIVERSAL
Encoder Evaluation Interfaces: Four
Master Communication Module: SERCOS
Cable Type: Fiber Optics (provided separately)
Mounting: Easy to mount and dismount
Plug-in Limit: Maximum of 20 times
Control Panel: Standard with single-line display and four keys
Safety Option: Safety Technology I/O
Shipping: Global