Srm1(-V2) Cycle Time - Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual

SRM1(-V2) Cycle Time and I/O Response Time

8-3-2 SRM1(-V2) Cycle Time

Process
Overseeing
CompoBus/S end wait
Input refreshing
Program execution
Cycle time calculation
Output refreshing
RS-232C port servicing
Peripheral port servicing
Minimum Cycle Time
538
The processes involved in a single SRM1(-V2) cycle are shown in the following
table, and their respective processing times are explained.
Content
Setting cycle watchdog timer, UM check, etc.
Waiting for CompoBus/S processing to finish
Input information is read to input bits.
User program is executed.
Refer to 8-3-6 SRM1(-V2) Instruction Execution
Times.
Standby until set time, when minimum cycle time is
set in DM 6619 of PC Setup.
Calculation of cycle time.
Output information (results of executing program) is
written to output bits.
CompoBus/S communications are started.
Devices connected to RS-232C port serviced.
Devices connected to peripheral port serviced.
In SRM1(-V2) PCs, CompoBus/S communications are started after the output
refresh is completed. As a result, when the overseeing time plus the RS-232C
port servicing time plus the peripheral port servicing time is shorter than the
CompoBus/S communications response time, processing is placed on stand-by
until CompoBus/S communications are completed.
The minimum cycle time therefore is the the CompoBus/S communications re-
sponse time plus the program execution time plus the input refresh time plus the
output refresh time. The CompoBus/S communications response time depends
on the "maximum number of nodes" and "communications mode" settings, as
follows:
Max. number of nodes Communications mode CompoBus/S response time
32
16
Note The maximum number of nodes and communications mode are set in the PC
Setup (DM 6603).
0.18 ms
CompoBus/S communications re-
sponse time – Overseeing time –
RS-232C port servicing time – periph-
eral port servicing time
0.02 ms
Total time for executing instructions.
(Varies according to content of user's
program.)
Almost instantaneous, except for
standby processing.
0.05 ms
5% or less of cycle time, but always
between 0.55 and 131 ms
(Set in DM 6616.)
5% or less of cycle time, but always
between 0.55 and 131 ms
(Set in DM 6617.)
High-speed mode
Long-distance mode
High-speed mode
Long-distance mode
Section 8-3
Time requirements
0.8 ms
6.0 ms
0.5 ms
4.0 ms