ifm
Supplementary device manual Interface CANopen in the AS-i controllerE
Function
The CANopen fieldbus interface
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5.2.2
The dual-ported RAM
In order to understand the settings of the fieldbus interface it is important to understand the function of
the dual-ported RAM. The dual-ported RAM, in the following called DP-RAM, is a memory range which
constitutes the interface between the controllerE data and the data of the fieldbus interface. The DP-
RAM consists of two different ranges:
the so-called
IN
range which provides data from the controllerE to the fieldbus interface
(controllerE output data)
the so-called
OUT
range which provides data from the fieldbus interface to the controllerE
(controllerE input data).
Both ranges have a size of 512 bytes respectively.
The following figure shows the correlations of the data flow:
RTS 2.x
ControllerE
F
i
e
l
d
b
u
s
Adr.: 0x0000
Adr.: 0x0001
Adr.: 0x01FF
.
.
.
IN
Adr.: 0x0000
Adr.: 0x0001
Adr.: 0x01FF
.
.
.
OUT
DP-RAM
