Cpm2A/Cpm2C Cycle Time And I/O Response Time; Cpm2A/Cpm2C Cycle Time - Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual

CPM2A/CPM2C Cycle Time and I/O Response Time

Code Mnemonic ON execution
time ( s)
97 IORF 40.0
142.6
135.4
99 MCRO
74.0
116.4
8-2

CPM2A/CPM2C Cycle Time and I/O Response Time

8-2-1 CPM2A/CPM2C Cycle Time

Process
Overseeing Setting cycle watchdog timer, I/O bus check, UM
check, clock refreshing, refreshing bits allocated to
new functions.
Program User program is executed.
execution
Cycle time Automatic delay until minimum cycle time when a
calculation minimum cycle time is set in DM 6619 of PC Setup.
Calculation of cycle time.
I/O refreshing Output information (results of executing program) is
written to output bits.
Input information is read to input bits.
RS-232C port Communications processing when a Programming
servicing Device or Communications Adapter is connected to
the RS-232C port.
Peripheral port Devices connected to peripheral port serviced.
servicing
Cycle Time and Operations
Cycle time
1 ms or longer TMHH(––) may be inaccurate when TC 000 through TC 003 or TC 008 through TC 255 are used
(operation will be normal for TC 004 through TC 007).
10 ms or longer TIMH(15) may be inaccurate when TC 004 through TC 255 are used (operation will be normal for
TC 000 through TC 003).
20 ms or longer Programming using the 0.02-second Clock Bit (SR 25401) may be inaccurate.
100 ms or longer TIM may be inaccurate. Programming using the 0.1-second Clock Bit (SR 25500) may be inaccu-
rate. A CYCLE TIME OVER error is generated (SR 25309 will turn ON).
120 ms or longer The FALS 9F monitoring time SV is exceeded. A system error (FALS 9F) is generated, and opera-
tion stops.
200 ms or longer Programming using the 0.2-second Clock Bit (SR 25501) may be inaccurate.
Conditions (Top: min.; bottom: max.)
Refreshing IR 000
Refreshing one input word
Refreshing one output word
With word-set I/O operands
With :DM-set I/O operands
The processes involved in a single CPM2A/CPM2C cycle are shown in the fol-
lowing table, and their respective processing times are explained. Refer to the
CPM2C-S Operation Manual (W377) for information on the cyclic operation of
the CPM2C-S.
Content
The effects of the cycle time on CPM2A/CPM2C operations are as shown below.
When a long cycle time is affecting operation, either reduce the cycle time or im-
prove responsiveness with interrupt programs.
Operation conditions
OFF execution time ( s)
6.0
5.6
Time requirements
0.3 ms
Total time for executing instructions. (Varies
according to content of user's program.)
Negligible except for the delay itself when re-
quired.
CPM2C CPU Unit:
20-point CPM2A CPU Unit: 0.06 ms
30-point CPM2A CPU Unit: 0.3 ms
40-point CPM2A CPU Unit: 0.3 ms
60-point CPM2A CPU Unit: 0.54 ms
Expansion I/O Unit:
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 pe-
ripheral port servicing can be set in DM 6617.)
Section 8-2
0.06 ms
0.3 ms
523