Dear all,
I have been testing a Protecting System similar to APS's, which has three levels. The first is a VME crate plugged with a MVME2302/IOC, a SV2R6008 scanner. The second is a AB crate plugged with a 1771DCM, a PLC5/40, a 1771SDN and two I/O local modules. The third is a 1794ADN which controls a 1794IB16 & a 1794OB16.
The first success should contribute to much help from Prof.M.Kraimer, Dr.A Johnson and Dr.
Now I meet some other questions. I use Rockwell RSlogix 4.11.00 revision to program PLC.
local input: I:010
DCM read buf: N10:0
DCM write buf: N10:64
SDN read buf: N11:0
When PLC sends data(block transfer) to DCM, the tag is set to 0 or 1 to distinguish the data from local I/O or from DeviceNet FlexI/O.
The rung orders are:
copy I:010 to N10:66
set N10:65=0 (tag=0)
BTW to DCM (l=64)
BTR read data to N11:0 from DeviceNet(l=62)
copy N11:1 to N10:66
set N10:65=1 (tag=1)
BTW to DCM
I use DM2K to display and there occur two problems.
1)Occasionally there is some exchanging data between local I/O and DeviceNet I/O.
2)When I change the local or FlexI/O input module states, there is unbearable delay in DM2K to update. When I use .5second to process abDCM record, the delay is nearly 8 seconds.
Any suggestion is welcome.
Lifang
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