Rockwell Automation 1747-PT1, D1747NP002 Hand-Held Terminal - Manual (Page 80)

Chapter 4
Data File Organization and Addressing
4–24
Access Time
During the program scan, the processor must access the specialty I/O card to
read/write M0 or M1 data. This access time must be added to the execution
time of each instruction referencing M0 or M1 data. The following table
shows approximate access times per instruction or word of data for the
SLC 5/02 processors.
Processor
Access Time per Bit
Instruction or Word of Data
Access Time per
Multi–Word Instruction
SLC 5/02 Series B 1.93 ms 1.58 ms plus 0.67 ms per word
SLC 5/02 Series C 1.16 ms 0.95 ms plus 0.40 ms per word
If you are using a Series B processor, add 1.93 ms to the program scan time for
each bit instruction addressed to an M0 or M1 data file. If you are using a Series C
processor, add 1.16 ms.
If you are using a Series B processor, add 1.58 ms plus 0.67 ms per word of data
addressed to the M0 or M1 file. This adds 24.36 ms to the scan time of the COP
instruction. If you are using a Series C processor, add 0.95 ms plus 0.40 ms per word.
This adds 14.55 ms to the scan time of the COP instruction.
] [
M0:2.1
1
]/[
M1:3.1
1
( )
M0:2.1
10
COP
COPY FILE
Source
#B3:0
Dest #M0:1.0
Length 34