ABB AC 900F - Coupler Bus Slots

Coupler bus slots Section 5 Mounting
78 M&I – AC 900F Controller
Coupler bus slots
The C1 and C2 coupler bus slots serve for connecting the CI/CM communication
interfaces to the CPU module. When configuring the AC 900F controller and
integrating a CI/CM module, the bottom module part must be plugged in first. Then
press the module backwards until it locks in place at the top of the slot.
Coupler bus C1-C2_us.png
A TA dummy coupler is installed and removed from the C1/C2 slots as described
for a communication interface.
The module change during operation is described in Section 8, Service.