How To Calculate The Transmission Delay Time - Mitsubishi Electric Melsec QJ71LP21 Reference Manual
Q corresponding melsecnet/h network system
Hide thumbs
Also See for Melsec QJ71LP21:
- Reference manual (356 pages) ,
- Reference manual (400 pages) ,
- Reference manual (444 pages)
Table of Contents
Advertisement
3
SPECIFICATIONS
3.3.2 How to calculate the transmission delay time
3 - 33
(1) Transmission delay time in the same network
(a)
Cyclic transmission (LB/LW/LX/LY periodical communication)
The transmission delay time in the B/W/Y communication is obtained by the
equation below using the following variables:
• Scan time for the sending and receiving stations (except link refresh time)
• Link refresh time
• Link scan time
• Tracking time
• Scan time delay due to tracking transfer
[Transmission delay time (T
1) When a non-redundant CPU receives data
+
T
= S
+ (LS
D1
T
T
+
(MAX : T
= S
D1
T
2) When a redundant CPU receives data
+
T
= S
+ (LS
D1
T
T
+
(MAX : T
= S
D1
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
: Link refresh time of the sending station
T
: Link refresh time of the receiving station
R
LS : Link scan time
Ts : Scan time delay due to tracking transfer 2
1: Total of installed network modules
2: For the scan time delay due to tracking transfer, refer to the
QnPRHCPU User's Manual (Redundant System).
The equation above assumes the following conditions:
• There is no faulty station.
• The transient transmission is not executed.
POINT
(1) For the transmission delay time in the B/W/Y communication (T
equation for the "MAX" if the worst conditions coincide because the scan of the
sequence program and the link scan are asynchronous.
(2) When the "Block send/receive data assurance per station" boxes is checked,
add the following delay time to the transmission delay time (T
• In the case of S
Normal : Add "+ 0.5
MAX : Add "+ 1.0
• In the case of S
Normal : Add "+ 0.5
MAX : Add "+ 1.0
(3) In the MELSECNET/H Extended mode, the "Block send/receive data assurance
per station" boxes are preset by default. Therefore, add any of the values
shown in (2) above to the transmission delay time (T
) in B/W/Y communication]
D1
+
0.5) + (S
)
R
R
+
+ (LS
1) + (S
T
R
+
0.5) + (S
+ Ts)
R
R
+
+ (LS
1) + (S
T
R
>LS
T
+
(S
)"
T
T
+
(S
)"
T
T
<LS
T
LS"
LS"
1.5 [ms]
)
2)
R
1.5 [ms]
+ Ts)
2)
R
1
1
D1
).
D1
MELSEC-Q
), use the
D1
).
3 - 33
- Quick Links:
- Optical Fiber Cable Specifications
- Qj71Br11
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
