Allen-Bradley SLC 500 DeviceNet, User Manual, Page: 18 / 139

Publication 1747-6.5.5 - August 2000
1-2 Before You Begin
What Your 1747-SDN
Module Does
In a typical configuration, the 1747-SDN module acts as an interface
between DeviceNet devices and the SLC 500 processor.
The 1747-SDN module communicates with DeviceNet devices over
the network to:
•
read inputs from a device
•
write outputs to a device
•
download configuration data
•
monitor a device’s operational status
The 1747-SDN module communicates with the processor in the form
of M1/M0 File Transfers and/or Discrete I/O (DIO). Information
exchanged includes:
•
device I/O data
•
status information
•
configuration data
1770-KFD PC
Communication
Module
PC with RSNetWorx
for DeviceNet software
Series 9000
Photoeye
RediSTATION
1305 Drive
FLEX I/O Rack
DeviceNet
Devices
Typical DeviceNet Network
SLC 500
Processor
1747-SDN
Interface module
SLC 500 Modular Chassis
An M1/M0 file transfer is a method
of moving large amounts of data
between a SLC 500 processor and
the 1747-SDN. It transfers files
containing a maximum of 256 words
and may take more than one SLC
program scan to complete.
Discrete input and output (DIO) is
the transfer of 1 to 32 words
between a SLC 500 processor and
the 1747-SDN. All 32 words of input
data and all 32 words of output data
are updated on each SLC program
scan.