OPERATION MANUAL CompoBus/S

I/O Response Time Characteristics Section 2-5
Maximum I/O Response
Time
48
Slave
processing
PLC cycle
Master Unit processing
Communications cycle
Input
Output
2. Add another 20 µs to the values shown in the table when
using the Slave registration function or communications
stop mode.
CJ-series Master Units
Master Usable node number setting
Note 1. The values in the above table are applicable when connected
to the CPU Rack. Add another 20 µs to the values
shown in the table when connected to an Expansion
Rack.
2. Add another 20 µs to the values shown in the table when
using the Slave registration function or communications
stop mode.
CQM1 Master Units
IN0 to IN7 and
OUT0 to OUT7
The following timing chart shows the maximum I/O response time.
TS(IN-max)
TS
IN
IN0 to IN15 and
OUT0 to OUT15
CJ1 (without -H suffix) TI/O = 160 µs TI/O = 180 µs
CJ1-H TI/O = 120 µs TI/O = 130 µs
Master PLC word allocation setting
2 words 4 words 8 words
CQM1 TI/O = 15 µs TI/O = 30 µs TI/O = 60 µs
TM-in
TPLC TPLC
Maximum I/O response time (TMAX)
TM-out-max
OUT
The maximum I/O response time is the total of the following terms:
TMAX = IN + TS × 3 + TM-in + TPLC × 2 + TM-out-max + OUT
(TS = TS (IN-max) + TS (OUT-max) )
TMAX : Maximum I/O response time
TPLC : PLC’s cycle time
IN: Input delay in the Slave (Refer to 2-5-3 Slave I/O Delay Times.)
OUT: Output delay in the Slave (Refer to 2-5-3 Slave I/O Delay Times.)
TS : Communications cycle time = Ts (IN-max) + Ts (OUT-max)
TS
TS(OUT-max)