ABB AC 800M

PM891 Processor Unit – General Section 1 Introduction
42 3BSE036351-510 A
Screw terminals are provided for connections to the power supply and the external
battery.
The 24 V DC power supply powers all the units on the CEX-Bus. The optical
module clusters are powered independently.
Figure 9. PM891-Top view
Secure Digital (SD) slot
INIT
RCU Data Link
RCU Control Link
button