Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual - Manual (Page 112)

Performance and Theory of Operations
Chapter 7
7-7
Setup #5
NOCV = 0 (VME coprocessor constantly read PLC processor)
Copy to global VME RAM on-board the PLC processor at 0xA00000
Programming terminal attached to PLC processor monitoring ladder file
Command Minimum msec. Maximum msec. Average msec.
CTV #N7:0 A0000 D16 1 6.0 20.0 10.0
CTV #N7:0 A0000 D16 500 10.0 27.0 16.0
CTV #N7:0 A0000 D16 1000 114.0 25.0 18.0
CFV A0000 D16 #N7:0 1 6.0 20.0 10.0
CFV A0000 D16 #N7:0 500 10.0 22.0 15.0
CFV A0000 D16 #N7:0 1000 16.0 26.0 21.0
SVE 1 55 5.0 14.0 8.0
Setup #6
NOCV = 0 (VME coprocessor constantly read PLC processor)
Copy to global VME RAM off-board the PLC processor at 0x70000
Programming terminal attached to PLC processor monitoring ladder file
Command Minimum msec. Maximum msec. Average msec.
CTV #N7:0 A0000 D16 1 6.0 21.0 10
CTV #N7:0 A0000 D16 500 9.0 28.0 13.0
CTV #N7:0 A0000 D16 1000 12.0 27.0 18.0
CFV A0000 D16 #N7:0 1 6.0 20.0 10.0
CFV A0000 D16 #N7:0 500 11.0 26.0 16.0
CFV A0000 D16 #N7:0 1000 13.0 32.0 21.0
SVE 1 55 5.0 14.0 8.0
The basic function of a programmable controller system is to read the
status of various input devices (such as pushbuttons and limit switches),
make decisions based on the status of those devices, and set the status of
output devices (such as lights, motors, and heating coils). To accomplish
this, the PLC-5/VME processor performs two primary operations:
program scanning—where logic is executed and housekeeping
is performed.
I/O scanning—where input data is read and output levels are set.
Introduction to PLC-5/VME
Processor Scanning