Omron E5ZN-DRT Operation Manual page 134

Message Communications Characteristics
Message
Communications
Only (Remote I/O
Communications Not
Used)
Message
Communications with
Remote I/O
Communications
response message being sent or the message being received from another
node may be destroyed. Always perform message communications at inter-
vals longer than the message communications time and use message instruc-
tions (SEND, RECV, CMND, and IOWR). Never send messages to any one
node at intervals less than the message communications time.
If send or receive messages are destroyed, the error record will be placed in
the error history of the Master Unit. If an error occurs, read the error history
using the FINS command or monitor the error history from the Configurator.
The following equation can be used to calculate the approximate message
communications time.
Message communications time = Communications cycle time
sage bytes + 15) ÷ 6 + 1)
The number of message bytes is the number of data bytes following the FINS
command code. The communications cycle time depends on whether remote
I/O communications are being used.
Message communications time = 2 (see note) + 0.11 × T
T : Baud rate (500 kbps: T
B
Note The communications cycle when remote I/O communications are not being
used is 2 ms.
Communications cycle time = (Communications cycle time for remote I/O
communications only) + 0.11 × T
T : Baud rate (500 kbps: T
B
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.
= 2; 250 kbps: T = 4; 125 kbps: T
B B
+ 0.6 (ms)
B
= 2; 250 kbps: T = 4; 125 kbps: T
B B
Section 7-2
((No. of mes-
+ 0.6 (ms)
B
= 8)
B
= 8)
B
119