6 - 1 6 - 1
MELSEC-Q
6 TRANSMISSION DELAY TIME
6 TRANSMISSION DELAY TIME
This chapter describes the transmission delay times of the QJ71AS92.
6.1 AS-i cycle time
(1) AS-i Ver. 2.04-compatible I/O slaves
AS-i cycle time = 171µs x (number of communicating 2)
(2) AS-i Ver. 2.11-compatible I/O slaves
(a) Cycle time for the slaves that use the same address in group A and B
AS-i cycle time = {171µs x (number of communicating 2)} x 2
(b) Cycle time for the slaves that use different addresses in group A and B is
the same as described in (1).
(3) Analog
slaves
AS-i cycle time = {171µs x (number of communicating 2)} x 7 x (number
of channels)
TIP
Count the number of communicating slaves as described below.
AS-i Ver. 2.04-compatible I/O slaves and analog slaves:
• Count the number of connected slaves.
AS-i Ver. 2.11-compatible I/O slaves:
• When the slaves in group A and B use the same slave address, count the slaves
of the same slave address as 1.
• When the slaves in group A and B use different slave addresses, count the
number of connected slaves.
Example) When slaves are connected as shown below
Connected
slave address
Calculated
as in (1)
1
2
3
4
1 slave
12A
11A
12B
13B
14A
14B
Number of communicating slaves = 8 slaves in all
AS-i Ver. 2.04
-compatible
I/O slaves
Analog slaves
AS-i Ver. 2.11
-compatible
I/O slaves
1 slave 1 slave 1 slave
1 slave 1 slave 1 slave 1 slave
Calculated
as in (2)
Calculated
as in (3)
6
Downloaded from
