Omron CS1W-CRM21 - Page 169

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Remote I/O Communications Performance Section 5-3
Conditions
O = 16 × 0.25 µs = 0.004 ms
■ Reference Example
The following table shows the calculation results for the minimum I/O
response time for a Word Slave Unit with the maximum number of nodes and
a CPU Unit cycle time of 1 ms.
Bit Slave Units
■ Formula for the Minimum I/O Response Time for a Bit Slave Unit
TIN: Input Slave Unit input delay time
TNetCycInt: Interrupt processing time
TCrmInMin: Minimum input processing time at Master Unit
Tcyc: CPU Unit cycle time
TCrmOutMin: Minimum output processing time at Master Unit
TNetOut: Time allotted for output frames in communications cycle time
TOUT: Output Slave Unit output delay time
Baud rate Word outputs Word inputs Bit outputs Bit inputs
--- 8 nodes 16 nodes 32 nodes 48 nodes
Communications
mode
Number of nodes connected Word 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 0
16 word nodes (8 input, 8 out-
put)
4.2 4.2 4.2 6.0
Communications
mode 1
32 word nodes (16 input, 16
output)
4.2 4.2 4.3 7.4
Communications
mode 2
64 word nodes (32 input, 32
output)
4.3 4.3 4.7 10.2
Communications
mode 3
32 word nodes (16 input, 16
output)
128 bit nodes (64 bit input, 64
bit output)
4.2 4.3 4.4 8.8
Communications
mode 8
128 word nodes (64 input, 64
output)
256 bit nodes (128 bit input,
128 bit output)
4.5 4.6 5.0 18.4
CPU Unit processing
Master Unit processing
Communications cycle
Slave Unit processing
Maximum I/O response time
TIN
TNetCyc
TNetCyc
TCrmOutMin
TCyc
TNetOut
TOUT
TNetCycInt
TCrmOutMin
TIN
+
TNetCycInt
+
TCrmInMin
+
Tcyc
+
TCrmOutMin
+
TNetOut
+
TOUT