Experimental Physics and
Industrial Control System

Marty Kraimer <[email protected]> · Fri, 26 Oct 2001 07:45:21 -0500

It sounds like there is a problem with the communication between the DCM and
your IOC.

Do the following (All via the vxWorks shell)

dbpf "<dcm record>.TPRO","1"

What does it show? Does it show active for 8 seconds spans? I will guess yes.

Now type

dbior "drvAb",3 

On the link that has the DCM look at the first part. You should see something
like:

AB-6008SV link: 1 osw 002c vme: 0xf0c01000
    6008SV2R Scanner  Series A Revision A Copyright (c) 1995  Allen-Bradley
Company
         Mailbox lock timeouts 0
              Command timeouts 1
               Command Failure 0
         Interrupts per second 13
    Block Transfers per second 6
    Adapter Status Words
    1f20 0000 0000 0000 1d20 0000 0000 0000 
    0000 0000 0000 0000 0000 0000 0000 0000 
    0000 0000 0000 0000 0000 0000 0000 0000 
    0000 0000 0000 0000 0000 0000 0000 0000 
    scan list
    00 04 
  Adapter 0 ONLINE 1 slot addressing
    CARD 0: BT Scanning abDcm

Do you see an excessive number of command timeouts and/or failures?

Also do a

dbpr "<dcm record>",3
dbpr "<bi record>",3

Where <bi record> is the record you are looking at on the dm2K screen.

I would like to see these.

Marty Kraimer

Zheng Lifang wrote:
> 
> 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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System