Instruction Manual

170 Rockwell Automation Publication 1756-UM514C-EN-P - June 2014
Appendix B Application Guidelines and Tips
Use Uncached Connections
The following figure illustrates the difference in messages per second available
with uncached connections for each DH+ baud rate.
Maintain PCCC Message
Sequences
The 1756-DHRIO and 1756-DHRIOXT modules do not necessarily send
PCCC messages in the same order in which it receives them. To make sure of
proper sequences, wait for the PCCC response to the initial PCCC message
before you send another PCCC request.
0
10
Number of Nodes (that is number of messages)
1234567 8910111213
20
30
40
230K
115K
57.6K
14 15
50
60
Messages per Second
70
80