Setup #5, Setup #6, Introduction to plc-5/vme processor scanning – Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual User Manual
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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