Publication 1769-UM009B-EN-P - May 2002
Installation and Wiring 3-5
Protecting the Circuit Board from Contamination
The printed circuit boards of the modules must be protected from dirt,
oil, moisture, and other airborne contaminants. To protect these
boards, we recommend installing the system in an enclosure suitable
for the environment. The interior of the enclosure should be kept
clean and the enclosure door should be kept closed whenever
possible.
System Planning
Consider the following when planning your system:
• The scanner can communicate with up to 63 DeviceNet devices.
• The scanner, as a master, can own up to 63 slave I/O nodes.
• The scanner can simultaneously be a master and be a slave
owned by another DeviceNet master.
• A 1769-ECR (right end cap) or 1769-ECL (left end cap) is
required to terminate the end of the Compact I/O bus.
• Each bank of Compact I/O must have its own power supply (a
MicroLogix 1500 acts as the power supply for modules directly
connected to it).
• A Compact I/O power supply, or MicroLogix 1500 Base Unit,
has limits on the amount of +5V dc and +24V dc current it can
supply to modules in its I/O bank. These limits depend on the
catalog number (e.g. 1769-PA2) of the supply. A bank of
modules must not exceed the current limits of the I/O bank
power supply or MicroLogix 1500 Base Unit.
Refer to the Compact 1769 Expansion I/O Power Supplies
Installation Instructions, publication 1769-5.14 or the MicroLogix
1500 User Manual, publication 1764-UM001A-EN-P.
• The scanner has a distance rating of four, therefore the scanner
must be within four modules of the I/O bank’s power supply.
• Determine the DeviceNet baud rate based on standard
DeviceNet considerations.
• Consider the number of words of I/O data the host controller
supports.
For more information on planning your DeviceNet network, refer to
the DeviceNet Cable System Planning and Installation Manual,
publication DN-6.7.2.
Allen-Bradley Drives
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