Omron CPM2B ユーザーズマニュアル

Initialization processing is performed when the power is turned on. If there are no
initialization errors, the overseeing processes, program execution, I/O refresh-
ing, and communications port servicing are performed repeatedly (cyclically).

Startup initialization

Overseeing

processes

Program execution

Cycle time
calculation

I/O refreshing

RS-232C port

servicing

Peripheral port

servicing

S

Check hardware.

S

Check memory.

S

Read data from flash memory (program,
read-only DM data, and PC Setup settings).

S

Check for battery error.

S

Preset the watch (maximum) cycle time.

S

Check program memory.

S

Refresh bits for expansion functions.

S

Execute the program.
(Refer to the Programming Manual (W353) for
details on cycle time and I/O response times.)

S

Wait for minimum cycle time if a minimum
cycle time has been set in the PC Setup
(DM 6619).

S

Calculate cycle time.

S

Read input data from input bits.

S

Write output data to output bits.

S

Perform RS-232C port communications
processing. (Can be changed in DM 6616.)

S

Perform Peripheral port communications
processing. (Can be changed in DM 6617.)

PC cycle time

The cycle time can be read from a Programming Device.

AR 14 contains the maximum cycle time and AR 15 contains the present cycle
time in 4-digit BCD.