Omron CS1W-CRM21 - Page 168

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Remote I/O Communications Performance Section 5-3
Minimum I/O Response Time
Word Slave Units
■ Formula for Word Slave Minimum I/O Response Time
TIN: Input Slave Unit input delay 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
• TCrmOutMin: Minimum output processing time at Master Unit
Note Communications Mode 8
N = (Number of Word Output Slave Units × 0.5
µs) + (Number of Bit Output
Slave Units × 0.0625
µs)
N Calculation Example
Conditions
N = (48 × 0.5 µs) + (16 × 0.0625 µs) = 0.025 ms
• TCrmInMin: Minimum input processing time at Master Unit
Note Communications Mode 8
O = (Number of Word Input Slave Units × 0.25
µs)
O Calculation Example
CPU Unit processing
Master Unit processing
Communications cycle
Slave Unit processing
Maximum I/O response time
TIN
TNetCyc
TNetCyc
TCrmOutMin
TCyc
TNetOut
TOUT
TCrmOutMin
TIN
+
TCrmInMin
+
Tcyc
+
TCrmOutMin
+
TNetOut
+
TOUT
Communica-
tions mode 0
Communica-
tions mode 1
Communica-
tions mode 2
Communica-
tions mode 3
Communica-
tions mode 8
0.05 ms 0.055 ms 0.06 ms 0.06 ms 0.045 ms + N
(See note.)
Baud rate Word outputs Word inputs Bit outputs Bit inputs
--- 48 nodes 32 nodes 16 nodes 8 nodes
Communica-
tions mode 0
Communica-
tions mode 1
Communica-
tions mode 2
Communica-
tions mode 3
Communica-
tions mode 8
0.023 ms 0.025 ms 0.029 ms 0.025 ms 0.021 ms + O
(See note.)