Omron CPM2C-S100C Operation Manual page 163

Cycle Time
Process
Overseeing Set cycle watchdog timer, check I/O bus, check
UM, refresh clock, refresh bits allocated to new
functions.
Wait for completion Wait for completion of the CompoBus/S commu-
of CompoBus/S nications started in the CompoBus/S output
communications refreshing process.
CompoBus/S input Read input data from CompoBus/S Master
refreshing ASIC.
Program execution Execute user program.
Cycle time Wait until minimum cycle time has elapsed if a
calculation minimum cycle time is set in DM 6619 of PC
Setup.
Calculate of cycle time.
CompoBus/S output Write output data to CompoBus/S Master ASIC.
refreshing
Start CompoBus/S communications.
I/O output refreshing Write output data (results of executing program)
to output bits.
I/O input refreshing Read input data from input bits.
DeviceNet I/O Write output data to DeviceNet interface and
refreshing read input data.
RS-232C port servic- Communications processing when a Program-
ing ming Device or Communications Adapter is con-
nected to the RS-232C port.
Peripheral port ser- Service device connected to peripheral port
vicing when a Programming Device or Adapter is con-
nected.
DeviceNet communi- Perform communications processing (explicit
cations servicing message communications) with the DeviceNet
Master.
Note
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.
Content
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.
Time requirements
0.3 ms
---
0.02 ms
Total time for executing instructions. (Varies
according to content of user's program.)
Negligible except for the delay itself when
required.
0.05 ms
CPM2C-S CPU Unit:0.06 ms
Expansion I/O Unit:0.3 ms
0.1 ms
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.)
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.)
65.536 ms max.
Section 7-1
141