Omron CPM2C-S100C, Руководство по эксплуатации, Страница: 163 / 269

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Cycle Time Section 7-1
2. The maximum cycle time and current cycle time are stored in AR 14 and
AR 15 respectively.
3. The cycle time varies with the processing required and so it is possible that
the calculated value and the actual value may not be the same.
Note 1. The CPM2C-S starts I/O refreshing after CompoBus/S communications
are completed. If the cycle time is shorter than the CompoBus/S commu-
nications response time, the CPU will wait until CompoBus/S communica-
tions are completed before starting I/O refreshing again. In effect, this
delay results in a minimum cycle time equivalent to the CompoBus/S com-
munications response time.
2. Even if the CompoBus/S is not used, the cycle time will never be shorter
than the CompoBus/S communications response time.
3. The cycle time will be affected if there is a connection to a DeviceNet net-
work (-DRT models only). Adjust the system while connected to the De-
viceNet network.
Process Content Time requirements
Overseeing Set cycle watchdog timer, check I/O bus, check
UM, refresh clock, refresh bits allocated to new
functions. 0.3 ms
Wait for completion
of CompoBus/S
communications Wait for completion of the CompoBus/S commu-
nications started in the CompoBus/S output
refreshing process. ---
CompoBus/S input
refreshing Read input data from CompoBus/S Master
ASIC. 0.02 ms
Program execution Execute user program. Total time for executing instructions. (Varies
according to content of user’s program.)
Cycle time
calculation Wait until minimum cycle time has elapsed if a
minimum cycle time is set in DM 6619 of PC
Setup.
Calculate of cycle time.
Negligible except for the delay itself when
required.
CompoBus/S output
refreshing Write output data to CompoBus/S Master ASIC.
Start CompoBus/S communications.
0.05 ms
I/O output refreshing Write output data (results of executing program)
to output bits.
CPM2C-S CPU Unit:0.06 ms
Expansion I/O Unit:0.3 ms
I/O input refreshing Read input data from input bits.
DeviceNet I/O
refreshing Write output data to DeviceNet interface and
read input data. 0.1 ms
RS-232C port servic-
ing Communications processing when a Program-
ming Device or Communications Adapter is con-
nected to the RS-232C port. 0.55 ms min., 5% or less of cycle time up to
131 ms
(The percentage of cycle time allocated to
RS-232C servicing can be set in DM 6616.)
Peripheral port ser-
vicing Service device connected to peripheral port
when a Programming Device or Adapter is con-
nected. 0.55 ms min., 5% or less of cycle time up to
131 ms
(The percentage of cycle time allocated to
peripheral port servicing can be set in DM 6617.)
DeviceNet communi-
cations servicing Perform communications processing (explicit
message communications) with the DeviceNet
Master. 65.536 ms max.