Routing Error In Local Dh+ Messaging; Before Programming In A Controller - Allen-Bradley ControlLogix User Manual

Before Programming in
a Controller
For more information . . .

Routing Error in Local DH+ Messaging

If the 1756-DHRIO has a problem with routing a DH+ message, it
may return a response with an error status of D0 hex. A PLC-5 will
display this error as D000 hex when monitoring the message
instruction. If you receive this error message:
• check your message instruction to make sure a valid
destination node was entered
• check your default slot configuration to make sure that it
matches the location of the Logix5550 in the chassis
• make sure the 1756-DHRIO module is powered-up
Before programming your message block instructions in your
PLC-5/SLC, you must:
• determine which links will send and receive DH+ Local
messages
• draw a network - make sure you meet the design
requirements for Local DH+ messages
• assign DH+ node numbers
• use the ControlLogix Gateway Configuration software to
enter the controller slot or execute the default for the
controller slot for each channel configured for DH+
Important: These configuration steps must be done for each
1756-DHRIO in the your system.
For more information on the ControlLogix Gateway Configuration
Software, see the ControlLogix Gateway Configuration software user
manual, publication 1756-6.5.7.
DH+ Operation
Publication 1756-6.5.14 - August 1998
3-5