Allen-Bradley 1747-SN - Access Time; SLC 5;02 Processor Example

M0–M1 Files and G Files B–5
Publication 17476.6 - July 1996
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.
For the SLC 5/03 and SLC 5/04 processors, the instruction types
vary in their execution times.
The following table shows approximate access times per instruction
or word of data for the SLC 5/02, SLC 5/03, and SLC 5/04
processors.
Processor Instruction Type
Access Time per Bit
Instruction or Word of Data
Access Time per
MultiWord Instruction
SLC 5/02 Series B
All types
➀
1930 µs
1580 µs plus 670 µs per
word
SLC 5/02 Series C
All types
➀
1160 µs 950 µs plus 400 µs per word
XIC or XIO
782 µs
--
OTU, OTE, or OTL
925 µs
--
COP to M file --
772 µs plus 23 µs per word
SLC 5/03 (All
Si )
COP from M file --
760 µs plus 22 µs per word
Series)
FLL
--
753 µs plus 30 µs per word
MVM to M file
894 µs
--
any source or Destination M file
address
730 µs
--
XIC or XIO
743 µs
--
OTU, OTE, or OTL
879 µs
--
COP to M file --
735 µs plus 23 µs per word
SLC 5/04 OS400
COP from M file
--
722 µs plus 22 µs per word
SLC
5/04
OS400
FLL --
716 µs plus 30 µs per word
MVM to M file
850 µs
--
any source or Destination M file
address
694 µs
--
➀
Except the OSR instruction and the instruction parameters noted on page B-2.
SLC 5/02 Processor Example
] [
M0:2.1
1
]/[
M1:3.1
1
( )
M0:2.1
10