Rockwell Automation 1788-EN2PAR EtherNet/IP and ControlNet to PROFIBUS PA Linking Device User Manual User Manual
Page 37
Rockwell Automation Publication 1788-UM058B-EN-P - September 2014
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Set Up in the Studio 5000 Logix Designer Application
Chapter 2
Limitations
The linking device can support a maximum of 24 field devices and a maximum
current supply of 500 mA per trunk.
Benefits
The network is protected against a segment open circuit and short circuit
conditions, as long as a functional path exists to each instrument.
In a ring architecture, you can use bit 0 of the MasterStatus in the Logix input
assembly to determine if the ring is healthy. A 1 indicates the ring is closed and
operational, while a 0 indicates there is a break in the ring.
Master Redundancy
The linking device can support a maximum of two PA masters on one
PROFIBUS PA network. Configure the PA master with one of the architectures
in the software setup. Select the correct setup before downloading the
configuration.
Figure 4
is an example of a MulitMaster setup. When using only
single trunk architecture, you can add any IEC61158 junction box.
Figure 4 - MultiMaster Redundancy
IMPORTANT
When using ring redundancy, enable the auto-terminate function on the 1788-
PARJB junction box. See the1788-PARJB Quick Start Guide, publicatio
for details. Failure to enable the auto-terminate function can cause
network termination issues that can cause the network to become unstable.
IMPORTANT
When using certain MulitMaster architectures (such as ring redundancies),
enable the auto-terminate function on the 1788-PARJB junction box. Refer to
the 1788-PARJB Quick Start Guide, publicat
, for details. Failure
to enable the auto-terminate function might cause network termination issues
that can cause the network to become unstable.