Rockwell Automation 1734-ADNX POINT I/O DeviceNet Adpater User Manual - Manual (Page 113)

1 Publication 1734-UM002C-EN-P - July 2003
Appendix
C
1734-ADNX Rules and Guidelines Regarding
How to Use the 1734-ADNX
RULE 1: A DeviceNet Subnet may not bridge directly to another
DeviceNet Subnet. A 1734-ADNX may not be used on the Subnet of
another 1734-ADNX.
NOTE: The 1734-ADNX will fault and report an error with any
attempt to route message beyond the Subnet. It is not possible,
therefore, to send explicit messages or browse through two
1734-ADNX adapters in series or through one 1734-ADNX and a
network bridge device (or similar device) in series.
RULE 2: The aggregate sum of the primary DeviceNet trunk and its
tributary Subnets cannot exceed the primary DeviceNet trunk
scanner’s I/O table size. The primary DeviceNet trunk scanner is the
primary scanner, which provides data directly to the controller that
owns the POINT I/O modules. For a complete list of scanners, refer to
the RA Knowledgebase, Document # G32941961.
RULE 3: The 1734-ADNX Subnet is subject to all of the rules of ODVA
requirements for DeviceNet compliant devices.
RULE 4: A DeviceNet Subnet may not bridge to any other network.
Network is defined in this case as any communication link which is
transmitting information from multiple devices to a single
channel for
further processing and transmission onto a separate network. A 1791D
CompactBlock I/O module can be used on the Subnet of a
1734-ADNX, a 1734-ADN cannot be used on the Subnet.
RULE 5: The 1734-ADNX DeviceNet Subnet is comprised of the
adapter (always MAC ID 0), any backplane I/O modules and ODVA
compliant devices attached to the lower DeviceNet connector.
RULE 6: The 1734-ADNX DeviceNet Subnet must be terminated, like
any other DeviceNet network, according to ODVA specifications.
NOTE: Even if no modules are connected to the 2
nd
DeviceNet
connector, the terminating resistors must be inserted into the
DeviceNet connector to properly terminate the backplane. See
Rockwell Automation publication no. 1734-IN589, for more
information.