Rockwell-automation 2711 PANELBUILDER SOFTWARE USER MANUAL Manual de usuario Pagina 380

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PLC Programming Considerations
Appendix A
A-16
Table A.A
Typical
Program Scan T
imes
PLC2/30 1772LP1, LP2, LP3 5 ms/k
PLC3 1775L2 2.5 ms/k
PLC3/10 1775LP4, LP8 2.5 ms/k
PLC5/15 2 ms/k
I/O Scan Time
This depends on the type of processor/scanner and number of I/O chassis
on the same scanner channel. Refer to the applicable PLC controller or I/O
scanner users manual. Typical Discrete I/O scan times are as follows :
Table A.B
Discrete
I/O Scan T
imes
PLC2/30, (1772 SD, SD2)
1771SN
PLC5/15
7 ms / chassis
PLC3
PLC3/10
6 ms / chassis
on same channel
For the PLC-2/30, also include the synchronous “program I/O scan time”
which is typically .5 ms per local I/O rack.
Terminal Process Time
The terminal process time is the display update time, and it depends on
which screen is being displayed. Typically, the update time will be less
than 2 ms per dynamic object on the screen being displayed. If the alarm
window is enabled and is scanning a large bit file, the display update time
may increase slightly.
Block Transfer Timing Considerations
Block Transfer timing depends on the specific processor type and I/O
configuration. Refer to your PLC users manual for specific block transfer
information.
Typically, the equations provided in this section will not be necessary.
However, when response time is critical, or many block transfer devices
are used in an application, this section can be used as a guideline.
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