Omron CP1L CPU Getting Started Manual page 111

A-3 Inner Workings of CP1L
Peripheral Services
A
Note
110
SYSMAC CP1L Getting Started Guide
Peripheral services are event services that occur on an irregular basis, such as
monitoring and setup on PT, and online editing (editing programs under execution)
and monitoring on CX-Programmer.
It involves processing of service requests both to and from external devices.
In the CP-series, most of the services use the FINS command.
Each service is allocated with a fixed amount of time specified by the system, and
is executed every cycle. If the services processing completes within the allocated
time, no processing is performed during the remaining time.
Service Type
Peripheral USB port service
Serial port service
Communication port service
Built-in flash memory
accessing service
Memory cassette
accessing service
Service time is separately allocated for the peripheral USB port, serial port, and
communication port services. By default, 4% of the preceding cycle time will be
allocated.
If services take several cycles for execution, and are delayed, allocate a fixed
amount of time (as opposed to percentage) to each service. To do this, use [Set
time to all events] under PLC Settings.
Content
• Processes unscheduled requests received as FINS or
Host Link commands from CX-Programmer, PT, or from
a host computer via a peripheral USB port or serial port
(i.e. requests for program transfer, monitoring, forced-
set/reset, or online editing).
• Processes unscheduled requests issued by the CPU
unit via a serial port (non-solicited communications).
• Executes serial communication by SEND, RECV, and
CMND instructions. Uses internal logic ports 0 to 7 as
communication ports.
• Executes instructions in the background, using internal
logic ports 0 to 7 as communication ports.
• Processes reading and writing of data from and to the
built-in flash memory.
• Processes reading and writing of data from and to the
memory cassette.