Peripheral Devices
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8.12.3 Fieldbus specific Information
Most field buses are handled the same way by the PowerMACS system but some of them have a number
of extra parameters. These are described in the following sub chapters.
8.12.3.1 DeviceNet
The Anybus-CC DeviceNet communication module provides instant DeviceNet Real Time connectivity via
the host interface and supports the following features:
ï‚· DeviceNet communication, with baud rates 125, 250 and 500kbps
ï‚· Up to 256 bytes of Real Time I/O
ï‚· Up to 7060 bytes of acyclic data such as cycle data, trace etc.
ï‚· Generic EDS-file.
Use Name to specify the name of the device. This name should be
referred to when you create a reporter for the fieldbus using the New
reporter form.
Fieldbus Type should be set to DeviceNet.
Use Node addr. field to set the node address. Node address can be
set to [0..63]. Use the Baud Rate to set the baud rate to 125, 250 or
500 kBit/s.
See chapter: Fieldbus Interface for a description on PLC bytes In,
PLC bytes Out, Data bytes In, and Data bytes Out.
The parameter Fast bytes In defines the size (in bytes) of the input
data that is transferred as cyclic, or real time, IO data on the DeviceNet
network. Max value is PLC bytes In + Data bytes In. Leaving the
parameter "blank" will make all input data transferred as IO data.
Fast bytes Out defines the size (in bytes) of the output data that is
transferred as cyclic IO data on the DeviceNet network. Max value is
PLC bytes Out + Data bytes Out. Leaving the parameter “blank" will
make all output data transferred as IO data.
Note: The max size of Fast byte In/ Out is depended on the fieldbus
type and could be found in the table in chapter Fieldbus Interface.
The "fast" areas always start at offset zero (0) of the respective input or
output area. The remaining part of the respective areas is transferred
as acyclic data.
The input as well as the output area of the DeviceNet module is divided
in data blocks. The maximum size of each block is 64 bytes. For
example, if 400 bytes output is configured it will be available as seven
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