Omron CS1W-CRM21 - Page 167

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Remote I/O Communications Performance Section 5-3
• TIN: Input Slave Unit input delay time
For details on input delay times for individual Slave Units, refer to
the input specifications for individual Slave Units in the CompoNet
Slave Unit Operation Manual (Cat. No. W457).
• TNetBitIn: Time allotted for bit Input frames in communications cycle time
• TCrmInMax: Maximum input processing time at Master Unit
Note Communications Mode 8
M = (Number of Word Input Slave Units x 0.625
µs) + [{(Number of
Bit Input Slave Units × 7)
÷ 8} × 0.375 µs] + [(Number of Word Out-
put Slave Units or Word Input Slave Units, whichever is greater) +
(Number of Bit Output Slave Units and Bit Input Slave Units, which-
ever is greater)
× 0.5 µs]
M Calculation Example
Conditions
M = (16 × 0.625 µs) + (1 × 0.375 µs) + {(16 + 16) × 0.5 µs}
≅ 0.027 ms
■ Reference Example
The following table shows the calculation results for the maximum I/O
response time for a Bit Slave Unit with the maximum number of nodes and a
CPU Unit cycle time of 1 ms.
(With message communications)
Baud rate
Communications
mode
Maximum I/O 4.0 Mbit/s 3.0 Mbit/s 1.5 Mbit/s 93.75 kbit/s
Communications
mode 3
256 input words,
256 output words +
128 bit inputs, 128
bit outputs
0.809 ms 1.075 ms 2.322 ms 32.959 ms
Communications
mode 8
1,024 input words,
1,024 output words
+ 256 bit inputs, 256
bit outputs
0.013 ms ×
(Number of
Bit Input
Slave Units)
0.018 ms ×
(Number of
Bit Input
Slave Units)
0.038 ms ×
(Number of
Bit Input
Slave Units)
0.530 ms ×
(Number of
Bit Input
Slave Units)
Baud rate
Communications
mode
4.0 Mbit/s 3.0 Mbit/s 1.5 Mbit/s 93.75 kbit/s
Communications
mode 3
0.35 ms 0.35 ms 0.39 ms 0.39 ms
Communications
mode 8
0.25 ms + M
(See note.)
0.27 ms + M
(See note.)
0.33 ms + M
(See note.)
0.35 ms + M
(See note.)
Baud rate Word outputs Word inputs Bit outputs Bit inputs
--- 8 nodes 16 nodes 16 nodes 8 nodes
Communications
mode
Number of nodes con-
nected
Bit Slave Unit max. I/O response time (ms)
4.0 Mbit/s 3.0 Mbit/s 1.5 Mbit/s 93.75 kbit/s
Communications
mode 3
32 word nodes (16 input, 16
output)
128 bit nodes (64 bit input, 64
bit output)
11.0 12.4 20.9 194.6
Communications
mode 8
128 word nodes (64 input, 64
output)
256 bit nodes (128 bit input,
128 bit output)
18.2 21.5 40.6 442.6