Mitsubishi Electric Q Series Reference Manual page 78

3 SPECIFICATIONS
3 - 27
(b) Communication with the SEND/RECV/RECVS/ZNRD/ZNWR instruction
The transmission delay time in communication with the SEND, RECV,
RECVS, ZNRD, or ZNWR instruction depends on the system of the
sending and receiving stations, as shown below.
Receiving station
Sending station
Non-redundant system
Redundant system
The transmission delay time can be calculated using the following:
• Scan time for the sending and receiving stations (except link refresh time)
• Link refresh
• Link scan time
• Scan time delay due to tracking transfer
[Transmission delay time in SEND, RECV, RECVS, ZNRD,
or ZNWR instruction communication]
+ α
1) T = (S + S
D2 T T R
+ α
(MAX : T = (S
D2 T
+ α
2) T = (S + Ts
D3 T T
(MAX : T = (S +α
D3 T
S : Scan time of the sending station (except link refresh time)
T
S : Scan time of the receiving station (except link refresh time)
R
α
: Link refresh time of the sending station
T
α
: Link refresh time of the receiving station
R
Ts : Scan time delay due to tracking transfer on the sending side 3
T
Ts : Scan time delay due to tracking transfer on the receiving side 3
R
LS : Link scan time
(Number of simultaneous transient requests)
LS
U
Number of simultaneous transient requests:
The total number of times transient requests that are made during one link
scan from a station on the same network.
Maximum number of transients:
The maximum number of transients within one link scan set in the
supplementary settings of the common parameters.
1: The fraction is rounded up to the nearest whole number.
2: Total of installed network modules
3: For the scan time delay due to tracking transfer, refer to the
QnPRHCPU User's Manual (Redundant System).
Non-redundant system
Expression of 1)
Expression of 2)
(Note that the Ts
is "0.")
+ α
) 2 + (LS 4) + LS
R
+ α
+ S ) 2 + (LS
T R R
+ α
+S +Ts ) 2+(LS 4) + LS
T R R R
+ α +Ts
+ Ts + S
T T R R
(Maximum number of transient times)
Redundant system
(control system CPU)
Expression of 2)
(Note that the Ts
is "0.")
value Expression of 2)
R
[ms]
U
6) + LS )
U
[ms]
U
) 2 + (LS 6)+LS )
R U
2
2
MELSEC-Q
value
T
1
(LS 2)
– 1
3 - 27