Allen-Bradley 1756-DHRIO - Appendix B PCCC Commands Supported by the Data Highway Plus Module; Echo

1 Publication 1756-UM514B-EN-P - February 2003
Appendix B
PCCC Commands Supported by the Data
Highway Plus Module
What This Appendix
Contains
This appendix describes PCCC commands that your 1756-DHRIO
module can execute. The module executes these commands when
received on one of its DH+ ports only under the following conditions:
· The final destination address must be an address for the
1756-DHRIO.
· For DH+ messages with LSAP = 0 (local), the diagnostic
commands will be executed directly by the 1756-DHRIO if the
destination address is the 1756-DHRIO's DH+ node address.
· For DH+ messages with LSAP = 1 (remote), the diagnostic
commands will be executed directly by the 1756-DHRIO if the
DH+ message's network destination address is the network
address of one of the DH+ ports on the 1756-DHRIO or if the
DH+ message's network destination link ID is 0 and the network
destination node is the 1756-DHRIO's DH+ port node address.
· For the first case of the remote message the Routing Table and
DH+ ports must be configured
Echo
Any data sent in the echo command is returned in the echo reply.
CMD = 06h, FNC = 00