Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 383)

PLC Programming Considerations
Appendix A
A-19
Table A.C
Transfer Times for PLCĆ5/10/12/15/25 at 57.6K Baud
Transfer Local Chassis Remote Chassis
ББББББББ
ББББББББ
Read
БББББББББ
БББББББББ
0.9 + 0.1 W ms
ББББББББ
ББББББББ
9 + 21.3 C + 0.3 W ms
ББББББББ
ББББББББ
Write
БББББББББ
БББББББББ
0.9 + 0.1 W ms
ББББББББ
ББББББББ
13 + 30 C + 0.3 W ms
Table A.D
Transfer Times for PLCĆ5/40/60 at 57.6K Baud
Transfer Local Chassis Remote Chassis
ББББББББ
ББББББББ
Read БББББББББ
БББББББББ
0.9 + 0.1 W ms ББББББББ
ББББББББ
4 + 8 C + 0.3 W ms
ББББББББ
ББББББББ
Write БББББББББ
БББББББББ
0.9 + 0.1 W ms ББББББББ
ББББББББ
4 + 8 C + 0.3 W ms
C = number of remote I/O chassis
W = number of transfer words
Some typical transfer times with no requests in the queue are as follows:
Table A.E
Typical Transfer Times
Transfer Number of Words Local Chassis Remote /w 3 Chassis
on Channel
Б БББББ Б
БББББББ
Read
Б ББББ Б
ББББББ
10
Б ББББ Б
ББББББ
1.9 ms
Б БББББ Б
БББББББ
54 ms
Б БББББ Б
БББББББ
Write
Б ББББ Б
ББББББ
10
Б ББББ Б
ББББББ
1.9 ms
Б БББББ Б
БББББББ
79 ms
Б БББББ Б
БББББББ
Read
Б ББББ Б
ББББББ
32
Б ББББ Б
ББББББ
4.1 ms
Б БББББ Б
БББББББ
61 ms
Б БББББ Б
БББББББ
Write
Б ББББ Б
ББББББ
32
Б ББББ Б
ББББББ
4.1 ms
Б БББББ Б
БББББББ
86 ms
Terminal Process Time
Terminal process time is less than 2.0 ms (typical) per dynamic object on
the screen being displayed.
Program Scan Time
The block transfer timing formula does not include the PLC program scan
time (PS). The PLC-5 processor can execute block transfer instructions
asynchronously to the program scan, reducing the affect of the program
scan time. However, your program scan time will affect how quickly the
PLC data can be updated or acted on by other parts of the PLC program.
This can be calculated by adding the program scan time to the
formula (IE + WQ + TT + TP ). Sub-routines or “immediate I/O”
instructions can be used to reduce the effective program scan time.