ABB ACS850 Hardware Manual page 27

The control unit layout is shown below (cover assembly and protective coverings of
the slots removed).
optional I/O extensions
and encoder/resolver
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Slots 1 and 2 for
interface
Slot 3 for optional
fieldbus adapter
External 24 V power input
Relay outputs
+24VD
Digital inputs
Digital input/outputs
Analog inputs
Analog outputs
Drive-to-drive link
Safe Torque Off connection
Control panel / PC connection
Memory unit (JMU) connection
Operation principle and hardware description
27