Specifications

MACRO CPU Board
2 Introduction
The 3U MACRO Station can be configured in either of two fundamental assemblies – “UMAC MACRO” and
“MACRO Stack”:
• UMAC MACRO – In this configuration (once called "Pack") the 3U-
format boards are put together to communicate through a backplane bus
called the UBUS. All boards are installed in a Euro-card rack. In this
configuration, all 3U-format boards or modules can be installed or
withdrawn from the pack individually, providing ease of installation,
debugging, and repair.
The photo at the upper right shows a UMAC rack with power supply and I/O
boards that are connected through a backplane. This system allows for an easier
integration of the 3U MACROCPU for larger (up to 8 axes) applications.
• MACRO Stack – In the Stack configuration the 3U-format boards are put
together as a stack of piggyback boards, (right, below). This configuration is
ideal for compact, cost-sensitive embedded applications.
Note:
The Stack boards and related breakout boards can be installed in a Euro-card rack,
creating a hybrid “stack/pack” configuration. This requires a special backplane
configuration that makes removing stack boards difficult.
This hybrid configuration is now recommended for existing “legacy” systems only.
3U Product Configurations (General Description)
Assemblies of 3U-format boards can be made with either of two CPU processor boards – a 3U
MACROCPU board, or a 3U Turbo PMAC2 CPU board. Most other 3U-format boards, labeled
“Accessory” boards, can be used with either CPU board.
• When the 3U MACRO-CPU board is used, the resulting assemblies are called “UMAC MACRO” or "3U
MACRO Stack."
• When the 3U Turbo PMAC2 CPU board is used, the resulting assemblies are called “UMAC Turbo” or
"Turbo Stack."
Refer to the "UMAC & 3U Stack Products Selection Guide" for more detailed descriptions of how the rack
and stack products are integrated.