454
Message Communications Characteristics Section 8-2
Message
Communications
Only (Remote I/O
Communications Not
Used)
Message communications time = 2 (see note) + 0.11 × T
B
+ 0.6 (ms)
T
B
: Baud rate (500 kbps: T
B
= 2; 250 kbps: T
B
= 4; 125 kbps: T
B
= 8)
Note The communications cycle when remote I/O communications are not being
used is 2 ms.
Message
Communications with
Remote I/O
Communications
Communications cycle time = (Communications cycle time for remote I/O
communications only) + 0.11 × T
B
+ 0.6 (ms)
T
B
: Baud rate (500 kbps: T
B
= 2; 250 kbps: T
B
= 4; 125 kbps: T
B
= 8)
Note The above equations can be used to find the approximate message communi-
cations time, but not the maximum time. The message communications time
will depend on the frequency of the message communications, the load on the
remote node, the communications cycle time, and other factors. For any one
Master Unit, the message communications time may be greatly increased due
to heavy loads.
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