465
Computing the Cycle Time Section 10-4
Note 1. CJ1M Low-end CPU Units: CJ1M-CPU11/21.
2. The number of words allocated is the actual number of words allocated in
the I/O memory areas for all slaves.
Increase in Cycle Time
Caused by CPU Bus Units
The increase in the cycle time will be the I/O refresh times from the following
table plus the refresh time required for specific Unit functions.
CompoNet Master
Unit
CJ1W-
CRM21
Communica-
tions mode
No. 0
0.142 ms CJ1H-H: 0.156 ms
CJ1G-H: 0.189 ms
Low-end: 0.256 ms
(See note 1.)
Other: 0.233 ms
0.200 ms
Communica-
tions mode
No. 1
0.155 ms CJ1H-H: 0.178 ms
CJ1G-H: 0.211 ms
Low-end: 0.267 ms
(See note 1.)
Other: 0.256 ms
0.256 ms
Communica-
tions mode
No. 2
0.183 ms CJ1H-H: 0.189 ms
CJ1G-H: 0.233 ms
Low-end: 0.289 ms
(See note 1.)
Other: 0.267 ms
0.300 ms
Communica-
tions mode
No. 3
0.215 ms CJ1H-H: 0.244 ms
CJ1G-H: 0.289 ms
Low-end: 0.367 ms
(See note 1.)
Other: 0.322 ms
0.322 ms
Communica-
tions mode
No. 8
(See note 2.)
0.091 +
(0.0012 × No.
of words allo-
cated) ms
CJ1H-H: 0.106 +
(0.0012 × No. of
words allocated) ms
CJ1G-H: 0.109 +
(0.0014 × No. of
words allocated) ms
Low-end: 0.166 +
(0.0016 × No. of
words allocated)
ms (See note 1.)
Other: 0.100 +
(0.0016 × No. of
words allocated)
ms
0.154 +
(0.0022 × No.
of words allo-
cated) ms
CompoBus/S Mas-
ter Unit
CJ1W-
SRM21
Assigned 1
unit number
0.10 ms 0.12 ms 0.15 ms 0.15 ms
Assigned 2
unit numbers
0.11 ms 0.13 ms 0.17 ms 0.17 ms
Name Model I/O refresh time per Unit
CJ1-H-R CJ1-H CJ1M CJ1
Name Model Increase Remarks
Controller Link
Unit
CJ1W-
CLK21(V1)
CJ1-H: 0.1 ms
CJ1M: 0.15 ms
CJ1: 0.2 ms
There will be an increase of 0.1 ms + 0.7 µs × number of
data link words for CJ1-H and CJ1M CPU Units and 1.5 ms
+ 1 µs × number of data link words for CJ1 CPU Units.
There will be an additional increase of the event execution
times when message services are used.
Serial Commu-
nications Unit
CJ1W-SCU41-V1
CJ1W-SCU21-V1
CJ1W-SCU31-V1
CJ1-H: 0.22 ms
CJ1M: 0.24 ms
CJ1: 0.25 ms
There will be an increase of up to the following time when a
protocol macro is executed:
CJ1-H and CJ1M CPU Units: 0.7 µs × maximum number of
data words sent or received (0 to 500 words)
CJ1 CPU Units: 1 µs × maximum number of data words
sent or received (0 to 500 words)
There will be an increase of the event execution times
when Host Links or 1:N NT Links are used.
Ethernet Unit CJ1W-ETN11/21 CJ1-H: 0.1 ms
CJ1M: 0.17 ms
CJ1: 0.25 ms
If socket services are executed with software switches,
there will be an increase of 1.4 µs × the number of bytes
sent/received for CJ1-H and CJ1M CPU Units and 2 µs ×
the number of bytes sent/received for CJ1 CPU Units.
There will be an increase in the event execution times
when FINS communications services, socket services for
CMND instructions, or FTP services are performed.
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