Mitsubishi Electric Q Series Reference Manual page 226

7 APPLICATION FUNCTIONS
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(4) Calculation of transmission delay time
The processing time of the transient transmission instruction to access a station
on other network in a multiple network system can be obtained by adding the
following transmission delay factors.
(Routing transmission delay time) = (processing time from request source to relay station)
(a) Processing time from request source to relay station
This is the transmission delay time from the request source (the station that
executed the instruction) to the relay station that performs the routing. In the
following example, it is the time required for the data to be transmitted from
station 1M 1 to station 1N
P
Use the equation for the transmission delay time described in Section 3.3.2
to calculate the delay time.
(b) Processing time from relay station to request destination
This is the transmission delay time from the relay station to the request
destination (the station accessed with the instruction). In the following
example, it is the time required for the data to be transmitted from station
2M 1 to station 2N
P
Use the equation for the transmission delay time described in Section 3.3.2
to calculate the delay time.
Network No. 1
1M 1
P
READ
request
source
Sequence scan of
request source
Link scan on request
source side
Link scan on request
destination side
Sequence scan of
request destination side
REMARKS
When three or more networks are relayed through by means of routing, add the
processing time from one relay station to the other relay station to the routing
transmission delay time.
+ (processing time from relay station to request destination)
3.
S
3.
S
1N 3 2M 1
S P
Network No. 2
1M 2 2N 2 2N 3
P S S
READ
request
destination
READ execution
MELSEC-Q
READ completion
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