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Allen-Bradley 1756-DHRIO - Using Uncached Connections; Maintaining PCCC Message Sequences

Allen-Bradley 1756-DHRIO
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Publication 1756-UM514B-EN-P - February 2003
C-8 Application Guidelines and Tips
Using Uncached Connections
Figure C.5 illustrates the difference in messages per second available
with uncached connections for each DH+ baud rate.
Figure C.5
Maintaining PCCC
Message Sequences
The 1756-DHRIO module does 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 (i.e. number of messages)
12345678910111213
20
30
40
230K
115K
57.6K
14 15
50
60
Messages per Second
Version 5 of the 1756-DHRIO module added baud rates of 115.2K and 230.4K.
70
80

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