Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 27 Jun 2000 11:19:56 -0500

Vladis Korobov wrote:
> 
> I have problems with VIPC616 IP carrier board. I have some IP module
> developed for the home made field bus. This IP module uses only
> I/O registers, no memory. When I work via mv162 IP carrier it works
> OK. But when I tried to use VIPC616 I failed. I use all default
> settings for VIPC616 (base address 0x6000, memory is disabled).
> This IP has 16 bit control registers.
> I see that mapping is OK. When I sent a command to IP I see that
> LED for the proper slot is blinking, e.i. I address right registers.
> On the field bus side I see also LED blinking. This means that some
> information reaches the bus. But this information is not correct.
> The information on field bus side consist of all "1"s, although
> I send there some packed bus address, which doesn't consist of all "1"s.
> What could be the cause of information distortion?

This sounds to me like you may have a timing problem in the IP module
interface circuit - if the module is latching the data lines at the wrong
time (probably too early) then it will usually get all 1s data.  Look at
the IndustryPack specification for when the data has to become valid.

- Andrew
-- 
Sharks kill 10 people each year.  People kill 60,000,000 sharks each year.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System