Experimental Physics and
Industrial Control System

Kay-Uwe Kasemir <[email protected]> · Sat, 17 Dec 2005 13:38:58 -0500

On Dec 16, 2005, at 21:47 , John Dobbins wrote:

Dear All,

We have the following problem using Ethernet/IP device support (and

EPICS R3.14.7) with an Allen-Bradley ControlLogix PLC. We can write

to hardware output tags (things like Local:9:O.Data[1]) just fine,

however when we try to write to a soft tag, i.e. a controller tag

or a program tag, we find we can write a "one" but not a "zero".

What records do you have connected to the tag?
A single BO with
  SCAN="Passive"
  OUT="@plc Local:9:O.Data[1] S1"
?
Or multiple BOs for various bits in the same tag?
In the latter case, can you duplicate the problem
with a database that only contains a single BO?

Thanks,
-Kay

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System