Omron E5ZN-DRT, Operation Manual

Page: 131 / 162

116
Remote I/O Communications Characteristics Section 7-1
α
= (No. of allocated IN Area words for a Temperature Cont 2)
÷
5
Example: Temperature Controller Unit 1 = 5 IN Area words, Unit 2 = 3 IN Area
words, Unit 3 = 2 IN Area words, yielding a total of 10 IN Area words. (
Σα
= (5
+ 2)
÷
5 + (3 + 2)
÷
5 + (2 + 2)
÷
5 = 4)
IN communications cycle time = 18 ms
× Σ α
+ 6
×
10
= 18
×
4 + 6
×
10
= 122 ms
Note When IN Area words are not allocated for a Temperature Controller,
α
= 1.
Decimal points are truncated, but if there was a remainder, the value of
α
is
the qu 1.
■
OUT Communications Cycle Time
OUT communications cycle time = (19 ms
× Σ β
) + (7 ms
×
total allocated
words in OUT Area 1)
(The cycle time is 0 when the Output Enable Bits are OFF.)
β
= (Number of allocated OUT Area words for a single Temperature Control-
ler)
÷
3
Example: Temperature Controller Unit 1 = 5 OUT Area words, Unit 2 = 4 OUT
Area words, Unit 3 = 1 OUT Area words, yielding a total of 10 OUT Area
words. (
Σ β
= 5
÷
3 + 4
÷
3 + 1
÷
3 = 5)
OUT communications cycle time = 19 ms
× Σ β
+ 7
×
10
= 19
×
5 + 7
×
10
= 165 ms
Note Decimal points are truncated, but if there was a remainder, the value of
β
is
the qu 1.
Maximum Processing
Time for CompoWay/F
Commands Sent to the
Temperature Controller The processing time depends on the command, but the maximum processing
time for commands with slow response times is 370 ms.
Refresh Time
The refresh time is the time required for I/O data to be exchanged between
the PLC’s CPU Unit and the DeviceNet Master Unit. The PLC’s cycle time is
increased when a Master Unit is mounted, as shown below.
Note Refer to the PLC’s Operation Manual for more details on the refresh time and
the PLC’s cycle time.
Master Unit for CV-series
PLCs The PLC’s cycle time (CPU Bus Unit servicing) is increased by the amount
shown in the following table when a Master Unit is mounted to the PLC.
Master Unit for CS/CJ-
series, C200HX/HG/HE (-
Z), and C200HS PLCs The PLC’s cycle time (I/O refreshing) is increased by the amount shown in the
following table when a Master Unit is mounted to the PLC.
Process Processing time
CPU Bus Unit servicing DeviceNet Unit refreshing: 1.1 ms
Process Processing time
I/O refreshing DeviceNet Unit I/O refreshing:
Using Master Unit for CS/CJ-series, and C200HX/HG/HE
(-Z) PLCs
1.72 + 0.022 × number of words (ms) (See note.)
Using Master Unit for C200HS PLCs
2.27 + 0.077 × number of words (ms) (See note.)