DL06 Micro PLC User Manual, 3rd Edition, Rev. E
3-21
Chapter 3: CPU Specifications and Operation
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Service Peripherals
Communication requests can occur at any time during the scan, but the CPU only logs the
requests for service until the Service Peripherals portion of the scan. The CPU does not spend
any time on this if there are no peripherals connected.
During the Service Peripherals portion of the scan, the CPU analyzes the communications
request and responds as appropriate. The amount of time required to service the peripherals
depends on the content of the request.
CPU Bus Communication
Some specialty modules can also communicate directly with the CPU via the CPU bus. During
this portion of the cycle the CPU completes any CPU bus communications. The actual time
required depends on the type of modules installed and the type of request being processed.
Update Clock/Calendar, Special Relays, Special Registers
The clock, calendar, and special relays are updated and loaded into special V-memory locations
during this time. This update is performed during both Run and Program Modes.
NOTE: The Clock/Calendar is updated while there is energy on the super-capacitor. If the super-
capacitor is discharged, the real time and date is lost.
To Log Request (anytime)
DL06
Nothing Connected
Min. & Max
0µs
Port 1
Send Min. / Max.
5.8/11.8 µs
Rec. Min. / Max.
12.5/25.2 µs
Port 2
Send Min. / Max.
6.2/14.3 µs
Rec. Min. / Max.
14.2/31.9 µs
LCD
Min. / Max.
4.8/49.2 µs
To Service Request DL06
DL06
Minimum
9 µs
Run Mode Max.
412 µs
Program Mode Max.
2.5 second
Modes
DL06
Program Mode
Minimum
12.0 µs
Maximum
12.0 µs
Run Mode
Minimum
20.0 µs
Maximum
27.0 µs
