AIM Features and operation
AIM2505A Technical Manual V2.03
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4. AIM Features and
operation
This chapter includes a brief description about the AIM firmware.
The following topics are covered in this chapter:
I/O-bus
Node address
Input channels
Other AIM module feature
I/O Bus
The AIM module is compatible with EKE-Trainnet® Common I/O-bus (later referred
to as I/O-bus). The I/O-bus is available in several EKE-Trainnet® Coach Computer
central processing units like CPU, CPG, CPR etc. In this document all these units
are referred to as CPU.
The following figure shows the principal connection between the AIM module and the
CPU.
Figure 4.1
AIM-CPU connection
On the CPU side, an I/O-bus master called CIAO manages all communication
between the AIM module and the CPU. The CIAO transfers all data coming from the
AIM module into Binary tree registers. An ISaGRAF application can read this data
from the Binary tree. In the same manner, if the ISaGRAF application wants to send
something to the AIM module, it writes the data to the Binary tree.
The CIAO transfers all data from the Binary tree registers to the AIM module. The
Binary tree register addresses and the contents of each register are explained in
Chapter 5: AIM Binary Tree.