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48
I/O Response Time Characteristics
Section 2-5
2. Add another 20
µ
s to the values shown in the table when
using the Slave registration function or communications
stop mode.
CJ-series Master Units
Note
1. The values in the above table are applicable when con-
nected to the CPU Rack. Add another 20
µ
s
to the values
shown in the table when connected to an Expansion
Rack.
2. Add another 20
µ
s to the values shown in the table when
using the Slave registration function or communications
stop mode.
CQM1 Master Units
Maximum I/O Response
Time
The following timing chart shows the maximum I/O response time.
The maximum I/O response time is the total of the following terms:
T
MAX
= IN + T
S
×
3 + T
M-in
+ T
PLC
×
2 + T
M-out-max
+ OUT
(T
S
= T
S
(IN-max)
+ T
S
(OUT-max)
)
T
MAX
:
Maximum I/O response time
T
PLC
:
PLC’s cycle time
IN:
Input delay in the Slave (Refer to
OUT:
Output delay in the Slave (Refer to
T
S
:
Communications cycle time = Ts
(IN-max)
+ Ts
(OUT-max)
Master
Usable node number setting
IN0 to IN7 and
OUT0 to OUT7
IN0 to IN15 and
OUT0 to OUT15
CJ1 (without -H suffix)
T
I/O
= 160
µ
s
T
I/O
= 180
µ
s
CJ1-H
T
I/O
= 120
µ
s
T
I/O
= 130
µ
s
Master
PLC word allocation setting
2 words
4 words
8 words
CQM1
T
I/O
= 15
µ
s
T
I/O
= 30
µ
s
T
I/O
= 60
µ
s
Maximum I/O response time (T
MAX
)
Slave
processing
Output
Input
Communications cycle
Master Unit processing
PLC cycle
IN
OUT
T
PLC
T
PLC
T
M-in
T
M-out-max
T
S
T
S(OUT-max)
T
S
T
S(IN-max)