Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 147)

Sample Programs
Appendix A
A-29
Table A.C
Data Table Typical Transfer Time Using Method 2 Program
with Minimal Progam Scan (4–9 ms)
Number of Blocks
Being Transferred Number of Words
Being Transferred
Transfer Time (in ms)
for Series A BCM
(see notes 1 & 2) Transfer Time (in ms)
for Series B BCM
Fast Transfer Mode
Enabled (see notes 1,
3, & 4)
1 62 170–250 60–80
3 186 200–300 90–120
7 434 350–500 130–180
10 620 350–600 170–230
16 992 400–1000 180–260 5
32 1984 – 320–720 6
64 3968 – 700–1400 7
1 These times do not significantly change with program scan, but as the number of blocks increase
so does program scan.
2 Times were taken using a PLC-5/25 processor.
3 Series B BCM module with fast mode disabled is approximately 50% slower than the times
shown.
4 Times were taken using a PLC-5/40 processor with one channel configured for DH+ and three
channels configured for remote I/O scanner at 230 kbaud.
5 Program scan 12–16 ms.
6 Program scan 20–25 ms.
7 Program scan 30–35 ms.